tag:blogger.com,1999:blog-17781301597925372112024-02-18T23:24:34.996-08:00Spiders and meMy search for spiders to learn about their natural historyStephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-1778130159792537211.post-16641711345118868222011-09-02T13:49:00.000-07:002011-09-02T13:49:21.735-07:00New addressHi all, I have moved my blog to a different address! From now on new posts will be at:<br />
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http://blog.stephaniecobbold.com/<br />
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Thank you!!<br />
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Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com0tag:blogger.com,1999:blog-1778130159792537211.post-83028860701189799882011-08-08T19:56:00.000-07:002011-08-08T20:03:51.617-07:00Spiders in Seattle: a walk through the Washington Park ArboretumLast week I went to Seattle with Ryan for a family reunion. We spent Thursday afternoon exploring the Washington Park Arboretum, a very pretty park containing all sorts of exotic-looking plants, including magnolias, asiatic maples, rhododendrons and camellias. It didn't take long to notice that the vegetation supported many spider webs, and that the abundance of spiders was noticeably higher than in Logan.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicVgXhncha5iMEnqf0akFVaWrPSt6HdH2cRKKVxAvt6c1YNkFAf6XiU8fhpL5D2B9Ygr3x9DbawcvgZs8XGMZ8_r6Xre7bkDvRkePFQVXvaOFmjr23ztH1fTOxC6M1MDSqSnWL1_PSvBms/s1600/P1070049.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicVgXhncha5iMEnqf0akFVaWrPSt6HdH2cRKKVxAvt6c1YNkFAf6XiU8fhpL5D2B9Ygr3x9DbawcvgZs8XGMZ8_r6Xre7bkDvRkePFQVXvaOFmjr23ztH1fTOxC6M1MDSqSnWL1_PSvBms/s400/P1070049.JPG" width="400" /></a></div><div style="text-align: center;">Washington Park Arboretum</div><div style="text-align: center;"><br />
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</div><div style="text-align: left;">The first spider I found was an araneid of the genus <i>Zygiella</i>, an exciting find since I had never photographed this genus before. Zygiella spiders have a relatively flat, oval abdomen, and eyes that are closely spaced. The back of the abdomen has a leaf-shaped pattern (folium) that is generally white in the front and dark in the back. The orbweb built by adults is interesting because it typically has a missing sector on the upper half, in the direction of the spider's retreat. The missing sector is where the safety line is located, and this thread leads from the hub of the web to the retreat, as seen in the pictures below.</div><div style="text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcEjtqkH7GE_SrvFsjrGLmuWcZSd6b5AGvqfOuHyYNbppriYPidFDpRykwMyppY8uL9jqCIiuaVf7pGHOTn6fjcAK3QNQwxHX4gLTVFJDQmTg1rJAEAry8MiQsmfa5YdgBVWNXBKoeBCGO/s1600/P1070096M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="296" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcEjtqkH7GE_SrvFsjrGLmuWcZSd6b5AGvqfOuHyYNbppriYPidFDpRykwMyppY8uL9jqCIiuaVf7pGHOTn6fjcAK3QNQwxHX4gLTVFJDQmTg1rJAEAry8MiQsmfa5YdgBVWNXBKoeBCGO/s400/P1070096M+Mark.jpg" width="400" /></a></div><div style="text-align: center;"><i>Zygiella </i>close to her retreat<i><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirIq94u9Vy2wXpDccx_dOxE_ZUAhmUcVpzIdQXzKreKXTNH8vNzb6eBG24104Tj-KXkPAfGN90pkuVeCsk5VSgiVF1NNQ42n8RSjAH04uNDNRQKEY5z7I04kmkgQCq7XmSx5ZVlNGoNQSD/s1600/P1070035MzoomMark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="291" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirIq94u9Vy2wXpDccx_dOxE_ZUAhmUcVpzIdQXzKreKXTNH8vNzb6eBG24104Tj-KXkPAfGN90pkuVeCsk5VSgiVF1NNQ42n8RSjAH04uNDNRQKEY5z7I04kmkgQCq7XmSx5ZVlNGoNQSD/s400/P1070035MzoomMark.jpg" width="400" /> </a></div><div class="separator" style="clear: both; text-align: center;">Zygiella leaving her retreat to go on the safety line </div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: left;"></div><div class="separator" style="clear: both; text-align: left;"></div><div class="separator" style="clear: both; text-align: left;">Not far from the <i>Zygiella</i> web, I noticed a silk tent under which a small spider was guarding her eggs, which she kept in a round sac. I only got one picture and did not try too hard to identify her, as I didn't want to disturb her. </div><div class="separator" style="clear: both; text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: left;"></div><div class="separator" style="clear: both; text-align: left;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtzx-15eyiKuodB1hTl62bS1bft0Z9cbzFRSVd8jduqMo_SS00iU49zr4AoNIOaDWgKoj36o2lgHwR7Akoxix0T9_06VfgP2ac_KTl2x17W0t5jK0jx90T0wDj5Yc8vfGNxsG1K2539CpJ/s1600/P1070040M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="298" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtzx-15eyiKuodB1hTl62bS1bft0Z9cbzFRSVd8jduqMo_SS00iU49zr4AoNIOaDWgKoj36o2lgHwR7Akoxix0T9_06VfgP2ac_KTl2x17W0t5jK0jx90T0wDj5Yc8vfGNxsG1K2539CpJ/s400/P1070040M+mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;">A female web spider guarding her eggs</div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: left;">A tangle-web under a leaf revealed a theridiid (probably in the genus Theridion) with a branching pink median stripe on the back of its spherical abdomen. This spider reminds me of <i>Theridion pictum</i>, a species that is found in Europe, North America and Africa.</div><div class="separator" style="clear: both; text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: left;"></div><div class="separator" style="clear: both; text-align: left;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh36CBczUFxquhlsYbrVNy0GFjhnqYK0we2gcehy8_pOF6rIS4qLUQyHDeo0ERr1HzvRZuRCA_NFI5V_9TLzZbctEh5BnVvTj-vdlUt4ybBij_KjxTDgG9lWvGCfoIVeBjr-45evo3bn9Z-/s1600/P1070048M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="296" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh36CBczUFxquhlsYbrVNy0GFjhnqYK0we2gcehy8_pOF6rIS4qLUQyHDeo0ERr1HzvRZuRCA_NFI5V_9TLzZbctEh5BnVvTj-vdlUt4ybBij_KjxTDgG9lWvGCfoIVeBjr-45evo3bn9Z-/s400/P1070048M+Mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfWawj8Yxz-nnpg0QM2i0L3Lp8Yvvg7PGx9LYp9KRN0UyAochKRklXPoPlkuifk0ymE0_wlHS1UTw6k3rUMMX1evF-DhUoq0u3v82bCt-2Op5wXqAe8eR7qrzgbUMUxvfK70c5d8_hVoj1/s1600/P1070048M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br />
</a></div><div class="separator" style="clear: both; text-align: left;">The most conspicuous spider in the park was the Cross Orbweaver, <i>Araneus diadematus</i>. The webs of this spider were everywhere, even outside the park, in people's yards. This is the same species than the one mom found in our yard in France (see previous post).</div><div class="separator" style="clear: both; text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXN9O469NJF7fdZaI-nm_0eHfyVRSlI7yp5qyu4d7aKlUig6TY1sx6rlZbwGtgBXWkA46tM9edrArlGi_tNyU9HRbSBpF19lGiI1o6e0eB7pg12cTFwoUCY6pFBdw4VWP16e4rczok1qRI/s1600/P1070067M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="288" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXN9O469NJF7fdZaI-nm_0eHfyVRSlI7yp5qyu4d7aKlUig6TY1sx6rlZbwGtgBXWkA46tM9edrArlGi_tNyU9HRbSBpF19lGiI1o6e0eB7pg12cTFwoUCY6pFBdw4VWP16e4rczok1qRI/s400/P1070067M+Mark.jpg" width="400" /></a></div><div style="text-align: center;"><i>Araneus diadematus</i></div><div style="text-align: left;"><br />
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</div><div style="text-align: left;">I found a tetragnath spider of the genus <i>Metellina</i>, sitting in the center of a web, in a shrub relatively low above the ground. Tetragnaths, which are also known as Long-jawed Orb Weavers because of their typically long chelicerae, build orb webs that have a "hole" in the center. Their webs do not have a safety line or a retreat as described for the araneid <i>Zygiella</i>. There are only three species of <i>Metellina</i> in North America. The one I found was probably <i>Metellina segmentata</i>, a species introduced to Canada from Europe and first found at the northern edge of Washington in 1986.</div><div style="text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrsaAwQF-Mdmdd962QNUrQY7mC0maAQ1nUzTq2CCzXGRYVEOkoLiqt6gjOmPimzYNGBJ5R1m4qX_x2ssl0u0M135TwG9GImpdNSItjCGM0LRPA8v58T2T9Zm3AD-eEevrEhORl6-zI0MQT/s1600/P1070084M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrsaAwQF-Mdmdd962QNUrQY7mC0maAQ1nUzTq2CCzXGRYVEOkoLiqt6gjOmPimzYNGBJ5R1m4qX_x2ssl0u0M135TwG9GImpdNSItjCGM0LRPA8v58T2T9Zm3AD-eEevrEhORl6-zI0MQT/s400/P1070084M+Mark.jpg" width="400" /></a></div><div style="text-align: center;"><i>Metellina segmentata</i></div><div style="text-align: center;"><i><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5Ew3AyxVdcOFolaHQyGlr16-OF0RyEwccnzcDqYqdMopHT6OdYL1e1fHQoiH2S_ap_GLDaL-57DysA9qFzs8vOuhQkBgdygSUgNHGU7CcTpnRJiSgTDVb89IGXJiiFQlW2e7wxOw2gvKd/s1600/P1070077M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="292" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5Ew3AyxVdcOFolaHQyGlr16-OF0RyEwccnzcDqYqdMopHT6OdYL1e1fHQoiH2S_ap_GLDaL-57DysA9qFzs8vOuhQkBgdygSUgNHGU7CcTpnRJiSgTDVb89IGXJiiFQlW2e7wxOw2gvKd/s400/P1070077M+Mark.jpg" width="400" /></a></div><div style="text-align: center;">The underside of <i>Metellina</i>, sitting on the empty hub of her web.</div><div style="text-align: center;"><br />
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</div><div style="text-align: left;">As I was walking by some vegetation low on the ground, I noticed that most of it was covered in sheets of silk. I took a closer look and found that these were funnel-shaped webs built by spiders in the family Agelenidae, which are also known as Funnel-Web Spiders. The notorious Hobo Spiders belong to this family. These spiders usually sit inside a funnel-shaped retreat, but when they detect the vibrations caused by trapped prey, they quickly run across the sheet of silk to bite the victim. I tried to get one of these spiders out of its retreat by gently poking the sheet web. The spider came out so quickly that it startled me! </div><div style="text-align: center;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjv7ZZgWFfTYA40IpO-Wyvxr3fje6Fj0W6obljmvl6zv5fa-5MOyAwVKhTqtVUwiRGWi29IzIbXHzRrcex2XjyUPZo1m8h18hCnBk_zrcB9r-sf7AaZB5Bjhyphenhyphen7_HXbQBd2DdNE4VtPFEMcp/s1600/P1070109M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjv7ZZgWFfTYA40IpO-Wyvxr3fje6Fj0W6obljmvl6zv5fa-5MOyAwVKhTqtVUwiRGWi29IzIbXHzRrcex2XjyUPZo1m8h18hCnBk_zrcB9r-sf7AaZB5Bjhyphenhyphen7_HXbQBd2DdNE4VtPFEMcp/s400/P1070109M+Mark.jpg" width="400" /></a></div><div style="text-align: center;">Agelenid spider waiting inside the funnel of its web</div><div style="text-align: center;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6b-BJ5uGtfV-LGWaLh-qvExlNvrNAufoj6LhWq0FJlXzJ0o8mJmX8Yc7OKUlZFYgyD2HtSSKaME9-uk6T6t0xNne-Fa-n3H2KFJYCm66SOmhoA6cBDjZZXQqnS1lanP7cXFcZfrF3w36f/s1600/P1070105M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="288" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6b-BJ5uGtfV-LGWaLh-qvExlNvrNAufoj6LhWq0FJlXzJ0o8mJmX8Yc7OKUlZFYgyD2HtSSKaME9-uk6T6t0xNne-Fa-n3H2KFJYCm66SOmhoA6cBDjZZXQqnS1lanP7cXFcZfrF3w36f/s400/P1070105M+Mark.jpg" width="400" /></a></div><div style="text-align: center;">The agelenid runs out in response to vibrations in the web</div><div style="text-align: center;"><br />
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</div><div style="text-align: left;">Ryan found a philodromid spider on a bench, at the base of the armrest. Philodromids are active hunters that do not rely on webs to catch prey. This spider appeared to be guarding her eggs, which she had covered in a protective layer of silk. She did not move away from her eggs, even when I got very close to take a picture.</div><div style="text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjK3qO4JIqjj6eNgEF70r3muG6NWhJFE10JcDx9Pyj-QwHYQFbpFNa3FGPXar1y3yQP64X_qmurF91B6okmKM1G8supto95sHBYxsTsMSTTIQPSYUxcQtP9duOQTmw6P2ALKWAu1vXQI-YQ/s1600/P1070117M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjK3qO4JIqjj6eNgEF70r3muG6NWhJFE10JcDx9Pyj-QwHYQFbpFNa3FGPXar1y3yQP64X_qmurF91B6okmKM1G8supto95sHBYxsTsMSTTIQPSYUxcQtP9duOQTmw6P2ALKWAu1vXQI-YQ/s400/P1070117M.jpg" width="300" /></a></div><div style="text-align: center;">Even benches can provide good habitat for spiders!</div><div style="text-align: center;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigzrTit5ucg17UhowmfTRnN_0ckoFnSNNXxCktXXPp_iFt3yKTNd1TlGbM4pgyTsyVgLLW-v2YCqBK3gfCCorYptQ04KV3UqoU1rI2WM-dU_wJfC758sLoAzk2WI2z_lU43DnHG5pc3k_k/s1600/P1070113M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="285" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigzrTit5ucg17UhowmfTRnN_0ckoFnSNNXxCktXXPp_iFt3yKTNd1TlGbM4pgyTsyVgLLW-v2YCqBK3gfCCorYptQ04KV3UqoU1rI2WM-dU_wJfC758sLoAzk2WI2z_lU43DnHG5pc3k_k/s400/P1070113M+Mark.jpg" width="400" /></a></div><div style="text-align: center;">Philodromid spider guarding her eggs</div><div style="text-align: center;"><br />
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</div><div style="text-align: left;">I was excited to find the spider below in the rolled-up leaf of a shrub, although it is a species introduced from Europe. The spider belongs to the family Theridiidae, and the species is <i>Enoplognatha ovata</i>, a spider with yellow-white legs that varies alot in color and pattern. This individual had two pink stripes with small dark spots, on a cream-colored abdomen. </div><div style="text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijqY8tCyjnK5FqkyIYg6uXsAARFF1Fc5T7fGedWtE-5J4fac_Gi1HQNY5T_arp3cz5-GAtc4Kh5kCP7snkuCNlRJKsuCyuRIsjf22tNla76SxuxJRuzxmnX0Qkz4d6hhBtV3rgLHd3TO8c/s1600/P1070126M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijqY8tCyjnK5FqkyIYg6uXsAARFF1Fc5T7fGedWtE-5J4fac_Gi1HQNY5T_arp3cz5-GAtc4Kh5kCP7snkuCNlRJKsuCyuRIsjf22tNla76SxuxJRuzxmnX0Qkz4d6hhBtV3rgLHd3TO8c/s400/P1070126M+Mark.jpg" width="323" /></a></div><div style="text-align: center;"><i>Enoplognatha ovata</i></div><div style="text-align: center;"><br />
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</div><div style="text-align: left;">In a shrub nearby, I barely noticed a tiny tetragnath spider, holding onto the underside of a leaf, its long and slender legs stretched out in an attempt to blend in with the nearby vegetation. Many members of this family are characterized by these very long legs.<br />
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</div><div style="text-align: left;"></div><div style="text-align: left;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5jei8kICaiRPAmTepECiYW1_Eum0Vv8t_m8CAG02qOKOnWCSnfmg8z5IhQN6bwv7_AxXAVfUYMXFxDV5sz1USiVREDS5Q28tyUaLlyBHlj7dTWI1HQY8B9iJ4IkR36M7OnRVuZ_vy7XXh/s1600/P1070134M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="293" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5jei8kICaiRPAmTepECiYW1_Eum0Vv8t_m8CAG02qOKOnWCSnfmg8z5IhQN6bwv7_AxXAVfUYMXFxDV5sz1USiVREDS5Q28tyUaLlyBHlj7dTWI1HQY8B9iJ4IkR36M7OnRVuZ_vy7XXh/s400/P1070134M+Mark.jpg" width="400" /></a></div><div style="text-align: center;">A small tetragnath resting under a leaf</div><div style="text-align: center;"><br />
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</div><div style="text-align: left;">After walking under a bridge to get to the other side of a busy road, I inspected the outside walls of the bridge and found a couple of big <i>Larinioides sclopetarius</i> sitting in their webs. This spider, also known as the Bridge Spider, or Gray Cross Spider (family: Araneidae), prefers to build its web on man-made structures, especially near water. Apparently, it is rarely found on vegetation. In both sexes, the cephalothorax has conspicuous white markings, as seen in the picture below:</div><div style="text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXiTdJz2euZTyaUTr6aew1oh3DQ1glWvavxM7gm5p7uH61EQV5kAZwjo_7MRJ0buJoAceGp7UR9cSIf7W6K4FiwdoAuaLqHtfMZ607ZFonRw_l6mvLIZ4yjnRJnyChZ7HNBSrJHXsE-YPR/s1600/P1070167M+Mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="302" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXiTdJz2euZTyaUTr6aew1oh3DQ1glWvavxM7gm5p7uH61EQV5kAZwjo_7MRJ0buJoAceGp7UR9cSIf7W6K4FiwdoAuaLqHtfMZ607ZFonRw_l6mvLIZ4yjnRJnyChZ7HNBSrJHXsE-YPR/s400/P1070167M+Mark.jpg" width="400" /></a></div><div style="text-align: center;"><i>Larinioides sclopetarius</i> on a bridge wall</div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com0tag:blogger.com,1999:blog-1778130159792537211.post-18040340510886829012011-08-03T14:41:00.000-07:002011-08-03T14:52:39.184-07:00A french AraneusMom sent me a picture of a spider that we get every year in our backyard in Brittany, France. This spider, which she photographed in the shrubs by one of the yard fences, is an orb-weaver of the genus <i>Araneus</i>. The species appears to be <i>diadematus</i> (a.k.a. Cross Orbweaver, or Garden Spider), as suggested by the elongated white spots in the front of the abdomen that are arranged in the shape of a cross. <i>A. diadematus</i> is common in Europe, but it can also be found in parts of North America. Females usually sit face down in the web, or hide in a retreat near the web. The retreat is connected to the web by a special silk line so that the spider can quickly move between the two locations. The abdomen of <i>A. diadematus</i> has two "shoulder humps" in the front, as seen in the picture below. The back of the abdomen has a leaf-shaped pattern (folium) with scalloped margins. This species varies in color and in markings (the "cross" in some individuals is sometimes indistinct).<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmbdESNpC8EGMYeYl6B3ZUiwbYrZA4HJroYDHLHnOwKTVk9OwWgyciHrL8ouTjVGpACY8TALELEBDbl0y6rt0HjqYD3xuYOIOPqD3rtjxEAkQ-OvLCVcgoA0vR4njVX0tjZ95EE4YDyqEx/s1600/Sainte+Susanne+1M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="303" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmbdESNpC8EGMYeYl6B3ZUiwbYrZA4HJroYDHLHnOwKTVk9OwWgyciHrL8ouTjVGpACY8TALELEBDbl0y6rt0HjqYD3xuYOIOPqD3rtjxEAkQ-OvLCVcgoA0vR4njVX0tjZ95EE4YDyqEx/s400/Sainte+Susanne+1M.jpg" width="400" /></a></div><div style="text-align: center;"> <i>Araneus</i> <i>diadematus</i> with prey item wrapped in silk</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmcnZq0_Md8uO-iU4n-a26J1bPBFGo6j5oxZ1ITlKtgBq7TXnN1tUp1fQaCznqUM2VXlYyH-ngJgSpYY6jTVZwfF_4GLLO2fKnSUMpBVI4FuAyN81zW2Nc6wDOz7v8IvZ173Rwmzq6SEgp/s1600/Sainte+Susanne+1M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br />
</a></div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com0tag:blogger.com,1999:blog-1778130159792537211.post-27116932084493176572011-07-31T16:58:00.000-07:002011-08-01T09:01:55.675-07:00In search of the elusive ArgiopeThis morning, Lori Spears, Ben Kuethe and I went to a field located not far from Thatcher, a small town west of Tremonton. Someone had told Lori that there had been large amounts of Argiopes last year in this field in the late summer. Although this genus in the family Araneidae can be quite common in the right type of habitat, I had not seen it yet in the U.S. We followed the instructions to get there, eager to find some big Argiopes. <br />
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The field consisted mostly of grasses, thistles, and a few small shrubs:<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7OfL1ticDDfx8n7I0z-VAtyLYt-cQ2Fd_3FHqrAy3n3nvrMhkvSX0tPNvwGrd-VHfM8jrSs2yfL1EnGpFJ2BoyVUTNLia2FlD9T0O2eAjtFUdgukJToaLdqjyBGc7O00zxKI4HrZddui/s1600/P1060963M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb7OfL1ticDDfx8n7I0z-VAtyLYt-cQ2Fd_3FHqrAy3n3nvrMhkvSX0tPNvwGrd-VHfM8jrSs2yfL1EnGpFJ2BoyVUTNLia2FlD9T0O2eAjtFUdgukJToaLdqjyBGc7O00zxKI4HrZddui/s400/P1060963M.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br />
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</div><div class="separator" style="clear: both; text-align: left;">We walked around for quite a while without seeing any spiders at all, until we came across a couple of large orb webs. The occupants turned out to be <i>Aculepeira</i> spiders, which are in the same family as <i>Argiope</i>. These <i>Aculepeira</i> were big and appeared to be well fed, as suggested by the prey items caught in their webs. The abdomen of <i>Aculepeira</i> is typically egg-shaped, widest anteriorly, and has a dorsal longitudinal lobed band.</div><div class="separator" style="clear: both; text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: left;">Only two or three species of <i>Aculepeira</i> can be found in North America. According to Levi 's publication <a href="http://biostor.org/reference/651">The orb weaver genera Metepeira, Kaira and Aculepeira north of Mexico (Araneae, Araneidae)</a>, the species we found was probably <i>A. packardi</i>, as suggested by the posteriorly directed lobes on the back of the abdomen. I have collected this species at my field sites in Logan Canyon, but I had not seen any as big as the ones here. Adult <i>A. packardi</i> females build a new web every night and actively remove prey caught during the day.</div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHHxlvjR7T60UITV8DLY31uWwJNWhica3MbBpkvi0nDKHUNtOYyFW8llbXcYQ6xkNUDw50SgoOMuEI0mi0k75qQmWXxGmrC3kHmITdmxh_JnxxbOaGMsGtS2d-8UBpWhqor6wcYYx29NsX/s1600/P1060968M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="303" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHHxlvjR7T60UITV8DLY31uWwJNWhica3MbBpkvi0nDKHUNtOYyFW8llbXcYQ6xkNUDw50SgoOMuEI0mi0k75qQmWXxGmrC3kHmITdmxh_JnxxbOaGMsGtS2d-8UBpWhqor6wcYYx29NsX/s400/P1060968M+mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><i>Aculepeira</i> resting on thistle </div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgs3e1iPPKLzPK8Wij43TIXZt3GwpFhX-a3H5gMhJR9kYk0ewBG6Qy2bLPshpsvcT-_ukBHok1VsIZYmSK4QTkxEQ5Q9wQWtwOjDWB_-kL0A55hbWkDlwCoCYc_SQeOdkufRkcpbPcx95_X/s1600/P1060979M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="278" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgs3e1iPPKLzPK8Wij43TIXZt3GwpFhX-a3H5gMhJR9kYk0ewBG6Qy2bLPshpsvcT-_ukBHok1VsIZYmSK4QTkxEQ5Q9wQWtwOjDWB_-kL0A55hbWkDlwCoCYc_SQeOdkufRkcpbPcx95_X/s400/P1060979M+mark.jpg" width="400" /></a></div><div style="text-align: center;"><i>Aculepeira</i> sitting in the hub of her web with a prey item</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhleGJ24JBPj0m3lVIrHz9MSPflQ9kLJ3C69ZIUET131mH7qM58f5vUKIpLJ5ax6yJissgt-IGcLLOmuIryH5kx5Ss1edhXX7ZZimnDspIocTQUuVqdsUxFOn4DbmW7Jl3wi4B36SXvQfD-/s1600/P1060982M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhleGJ24JBPj0m3lVIrHz9MSPflQ9kLJ3C69ZIUET131mH7qM58f5vUKIpLJ5ax6yJissgt-IGcLLOmuIryH5kx5Ss1edhXX7ZZimnDspIocTQUuVqdsUxFOn4DbmW7Jl3wi4B36SXvQfD-/s400/P1060982M+mark.jpg" width="400" /></a></div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQdxd2K6N3dMmBLIbI5I8t-9mEGiysmxMYY2cy3Bh336dVlEDwo9dSjXIzxU0UXayK_68b_WKtycv87ns1AOmrC2VxWMT_Kzt4rNUvk1_AZWZObPZWglLSNRhuiVGHkmMKtHCk7CfwaFHZ/s1600/P1060991M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQdxd2K6N3dMmBLIbI5I8t-9mEGiysmxMYY2cy3Bh336dVlEDwo9dSjXIzxU0UXayK_68b_WKtycv87ns1AOmrC2VxWMT_Kzt4rNUvk1_AZWZObPZWglLSNRhuiVGHkmMKtHCk7CfwaFHZ/s400/P1060991M+mark.jpg" width="400" /></a></div><div style="text-align: center;"><i>Aculepeira</i> working on a large prey item</div><div style="text-align: center;"><br />
</div><div style="text-align: left;"><i>Aculepeira</i> has a typical median ventral white streak, as seen in the picture below:</div><div style="text-align: left;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEju6YO8wg6c2Ze8DhMaxesdrfFkYbvd3cJNsJt1TUTexEnAkpefMCEfns2HCNZEgDEaV6Csi-gsTnuiPCJVAISKNG9vWgDlH0d7mssjAowPxkhosgt9HPYeR2-8Po6ZmsHRZKVbr0LzRtCC/s1600/P1060992M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="301" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEju6YO8wg6c2Ze8DhMaxesdrfFkYbvd3cJNsJt1TUTexEnAkpefMCEfns2HCNZEgDEaV6Csi-gsTnuiPCJVAISKNG9vWgDlH0d7mssjAowPxkhosgt9HPYeR2-8Po6ZmsHRZKVbr0LzRtCC/s400/P1060992M+mark.jpg" width="400" /></a></div><div style="text-align: center;"><br />
</div><div style="text-align: left;">As we were discussing why we did not find any Argiopes yet, Lori found a small <i>Argiope trifasciata</i> in its web, not very far above the ground! This was the only one we were able to find, but it was a pretty spider that made our trip worthwhile.</div><div style="text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKpZ82YsGd2bvcvjc95IuIVZEJFbBoqnMPyWiASj379v_aZrglocETc9GVJxTsnTJ40okiiW-T3ktm5i4N-_sFPKXR3fX38kfUiMxzjrR4iIq8GeblXWY7sMTMPm3RToLKN67i04Rve05t/s1600/P1070013M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKpZ82YsGd2bvcvjc95IuIVZEJFbBoqnMPyWiASj379v_aZrglocETc9GVJxTsnTJ40okiiW-T3ktm5i4N-_sFPKXR3fX38kfUiMxzjrR4iIq8GeblXWY7sMTMPm3RToLKN67i04Rve05t/s400/P1070013M.jpg" width="400" /></a></div><div style="text-align: center;">Lori finds an <i>Argiope</i></div><div style="text-align: center;"><br />
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</div><div style="text-align: left;">Argiopes sit on the web with their head facing downwards, and their legs are often held in pairs. <i>Argiope</i> <i>trifasciata</i> is also known as the Banded Garden Spider. The back of its abdomen is a silvery/pale yellow background, with several horizontal black stripes, and the legs are striped. We think our spider was immature, as it was relatively small and had a mostly white dorsal surface.</div><div style="text-align: left;"><br />
</div><div style="text-align: left;">I have read that <i><span class="highlightedSearchTerm">Argiope</span> trifasciata </i> prefers to orient its web along an east-to-west axis, with its abdomen facing south. Given that the underside of <i>A. trifasciata</i> is mostly black, the orientation of the spider is supposed to maximize solar radiation and heat gain, which is an important consideration for spiders that are active late in the year.<i> </i></div><div style="text-align: left;"><i><br />
</i></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMSgvl4pnowNpYoyJM31j6l6pgEmMlUMh4v7cgkdJ4CGHEhe0Pp-2g8FB5Cwqdf3qIEzaPxDrpB8cvQaPqEEEl36_5sMn2s9h5hkEk20W0OsjeryHaCkrAi_SrCn7JsqfZPYODfVGnVANL/s1600/P1070007M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMSgvl4pnowNpYoyJM31j6l6pgEmMlUMh4v7cgkdJ4CGHEhe0Pp-2g8FB5Cwqdf3qIEzaPxDrpB8cvQaPqEEEl36_5sMn2s9h5hkEk20W0OsjeryHaCkrAi_SrCn7JsqfZPYODfVGnVANL/s400/P1070007M+mark.jpg" width="295" /></a></div><div style="text-align: center;"><i>Argiope trifasciata</i></div><div style="text-align: left;"><i><br />
</i></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgD5lkXPB-ZYRAjQA-D3FE909WJQm9eaz2NOaOhiwmJ-SB_V0zAEGGcZ_nnMdqg6m2qeHEMk_Iek8mcYjMxTU0rJm1I1wD4ed5vRinrcdEK7MANSGcyf8P107PfqJ5WiMZfyJiH1nl_DN_o/s1600/P1070012M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgD5lkXPB-ZYRAjQA-D3FE909WJQm9eaz2NOaOhiwmJ-SB_V0zAEGGcZ_nnMdqg6m2qeHEMk_Iek8mcYjMxTU0rJm1I1wD4ed5vRinrcdEK7MANSGcyf8P107PfqJ5WiMZfyJiH1nl_DN_o/s400/P1070012M+mark.jpg" width="295" /></a></div><div style="text-align: center;">The dark underside of<i> A.trifasciata</i></div><div style="text-align: center;"><i><br />
</i></div><div style="text-align: left;">We decided to return to this site in about a month, in hopes of finding adult Argiopes.<i><br />
</i></div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com0tag:blogger.com,1999:blog-1778130159792537211.post-16195603610828250232011-07-20T13:21:00.000-07:002011-07-20T13:35:20.394-07:00Dreaming about Colombia, part 1: El Paujil reserve<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiN86Tyaykpk8wQ66RZ8SE220SD8bUjXmtegWt32O3UjasIaH3CDJlGL6ZBulFL_iEmQEFf07gYOpGVOfOaP_0rHw670gyPJ6GxesdXfJVkdK-wMIb4W0oApyqHXhmCH9L49gnB4IubXtie/s1600/PaujilCabinGreenSpiderMmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br />
</a></div>In 2008 I went to Colombia to visit my family in Bogota and to spend some time in a couple of reserves that belong to the Fundacion ProAves, an NGO dedicated to the conservation of birds and their habitats. I had such an amazing time there that lately I have been longing to go back. While I wait for my next colombian adventure, I decided to post some spider pictures from that trip. The amount and diversity of spiders in these reserves was staggering, making these places a dreamland for arachnologists. There were spiders and spider webs everywhere!<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcafrmWX2cwKnter03rYTOpLT8dRiZGfCSbXvG7WaL7ZijVbbwab9S4n0uBWLW2rszhFcoVZRxO9nNGl16IF-xFuRQ2szEQwKWUTGfQUaVBgewfqSZ6mNJWCGsHgK4WolzK1CtM4KgrjuF/s1600/PaujilBigWeb.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcncnPdTLXS7mtpIGt3DBMQU_41CKNzTsyTxI4BqFDeUKxPiatF_Vk1V9bPHZK1JqkKXBW6LHtS_1eKuMMFVe68vqr1Y5_fCBR0LK91JbGuvkDLjD5KX6MKTxNDc1PYDwma6XetNEwrgVA/s1600/P1000116.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcncnPdTLXS7mtpIGt3DBMQU_41CKNzTsyTxI4BqFDeUKxPiatF_Vk1V9bPHZK1JqkKXBW6LHtS_1eKuMMFVe68vqr1Y5_fCBR0LK91JbGuvkDLjD5KX6MKTxNDc1PYDwma6XetNEwrgVA/s400/P1000116.JPG" width="400" /></a></div><div style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcafrmWX2cwKnter03rYTOpLT8dRiZGfCSbXvG7WaL7ZijVbbwab9S4n0uBWLW2rszhFcoVZRxO9nNGl16IF-xFuRQ2szEQwKWUTGfQUaVBgewfqSZ6mNJWCGsHgK4WolzK1CtM4KgrjuF/s1600/PaujilBigWeb.JPG" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcafrmWX2cwKnter03rYTOpLT8dRiZGfCSbXvG7WaL7ZijVbbwab9S4n0uBWLW2rszhFcoVZRxO9nNGl16IF-xFuRQ2szEQwKWUTGfQUaVBgewfqSZ6mNJWCGsHgK4WolzK1CtM4KgrjuF/s400/PaujilBigWeb.JPG" width="400" /></a></div><br />
El Paujil is a reserve dominated by rainforest, located in the departments of Santander and Boyaca. I spent a few days there, dedicating all my time to observing all the plants and animals I could find. I found it exciting to think that there are probably many undescribed species in this part of the world. We spent nights in a nice wooden cabin in the reserve. One of the first spiders I found was the one below, behind the cabin:<br />
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<div style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiN86Tyaykpk8wQ66RZ8SE220SD8bUjXmtegWt32O3UjasIaH3CDJlGL6ZBulFL_iEmQEFf07gYOpGVOfOaP_0rHw670gyPJ6GxesdXfJVkdK-wMIb4W0oApyqHXhmCH9L49gnB4IubXtie/s1600/PaujilCabinGreenSpiderMmark.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="287" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiN86Tyaykpk8wQ66RZ8SE220SD8bUjXmtegWt32O3UjasIaH3CDJlGL6ZBulFL_iEmQEFf07gYOpGVOfOaP_0rHw670gyPJ6GxesdXfJVkdK-wMIb4W0oApyqHXhmCH9L49gnB4IubXtie/s400/PaujilCabinGreenSpiderMmark.jpg" width="400" /> </a></div><div style="text-align: center;"><br />
</div><div style="text-align: left;">At lunch time, I noticed this small <i>Argiope</i> (family Araneidae) near the base of a tree. In North America, these spiders are known as Garden Spiders. Argiopes build orbwebs with a special silk structure in the middle called a stabilimentum (see picture below). The pattern of the stabilimentum varies across species, and the role of this structure is subject to debate.</div><div style="text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6Zrjfo6VEDn7ZZMjXkL_-Oqsz09nzDVIvAsrOHVdTw4E_gkO0xg3_IRmYN8QGRQ85s41mhOkS9krh3oFkAJf-jWk65Dg6zwECew2wXIDqC4yFESroITpukWK-Rw6z-vwN-nWfvJz1pSBE/s1600/PaujilLunchArgiopeMmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="303" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6Zrjfo6VEDn7ZZMjXkL_-Oqsz09nzDVIvAsrOHVdTw4E_gkO0xg3_IRmYN8QGRQ85s41mhOkS9krh3oFkAJf-jWk65Dg6zwECew2wXIDqC4yFESroITpukWK-Rw6z-vwN-nWfvJz1pSBE/s400/PaujilLunchArgiopeMmark.jpg" width="400" /></a></div><div style="text-align: center;"><i>Argiope</i> sitting on the stabilimentum of it web</div><div style="text-align: center;"><br />
</div><div style="text-align: left;">I also noticed this pretty jumping spider, which was wandering on a wooden post close to our lunch area:</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu8LyaYmQZdtGxkUdDkwcpUlNss-iAN4Hpv2QA-nrMh85dm-cW5q7shKL-idYgQcIJiXM5Z3G8oKKIkEDmCZF2OvtuRzu__zZeWOFYYSI_N3C9wkD-qYXa5qnj5J5nx1H3VN9dqBZL_8Cn/s1600/PaujilLunchJumper1M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgu8LyaYmQZdtGxkUdDkwcpUlNss-iAN4Hpv2QA-nrMh85dm-cW5q7shKL-idYgQcIJiXM5Z3G8oKKIkEDmCZF2OvtuRzu__zZeWOFYYSI_N3C9wkD-qYXa5qnj5J5nx1H3VN9dqBZL_8Cn/s400/PaujilLunchJumper1M+mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFufIKER18QZBFwdYiLyEmIFfKubPoEtfue1DV5sbmb3H4Us_mw8lEHTfjBdXROP8uo8SzSag2dAJf-Mgf1IUCwIzuQL2FPgAz4P966jmBhc6VNPshVRK26rN6pGG1InkhYB_MwWY3dz4j/s1600/PaujilLunchJumper2Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="308" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFufIKER18QZBFwdYiLyEmIFfKubPoEtfue1DV5sbmb3H4Us_mw8lEHTfjBdXROP8uo8SzSag2dAJf-Mgf1IUCwIzuQL2FPgAz4P966jmBhc6VNPshVRK26rN6pGG1InkhYB_MwWY3dz4j/s400/PaujilLunchJumper2Mmark.jpg" width="400" /></a> </div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: left;">My last find at lunch time was this araneid spider, which I found hidden in a rolled-up leaf. The silk structure at the tip of the leaf had called my attention. This spider had a roughly triangular shape, with several humps on the posterior part of her abdomen.</div><div class="separator" style="clear: both; text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0ysw79msJxzpNob9cHu8e6tHUSzcdJMOGJHimlB0v1XUmQjH_cMAI1-EYbry0oseIF5RNDyXmLX3eHJjO-mzWlmxy1TcxTd8rW1lnnNSBAPrN6kP_SDx2F0MQN-Z8i6xyKuYnwLeAXIGd/s1600/PaujilLunchSpider1Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"> </a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0ysw79msJxzpNob9cHu8e6tHUSzcdJMOGJHimlB0v1XUmQjH_cMAI1-EYbry0oseIF5RNDyXmLX3eHJjO-mzWlmxy1TcxTd8rW1lnnNSBAPrN6kP_SDx2F0MQN-Z8i6xyKuYnwLeAXIGd/s1600/PaujilLunchSpider1Mmark.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0ysw79msJxzpNob9cHu8e6tHUSzcdJMOGJHimlB0v1XUmQjH_cMAI1-EYbry0oseIF5RNDyXmLX3eHJjO-mzWlmxy1TcxTd8rW1lnnNSBAPrN6kP_SDx2F0MQN-Z8i6xyKuYnwLeAXIGd/s400/PaujilLunchSpider1Mmark.jpg" width="400" /> </a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDk66kuj-PjQhLgN7_3Fs4XrQdt5akH4Pf3dXgt2986GohaTNvITIsOaHUnNr5y0vPXSoJHdffeY-VIVIsHm2Jp9rPEaGhDgG8YYQtvUpPksSZEsk0_f_pfaUmojLmjNSnZ0m_Y4Z0y33Y/s1600/PaujilLunchSpider2mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDk66kuj-PjQhLgN7_3Fs4XrQdt5akH4Pf3dXgt2986GohaTNvITIsOaHUnNr5y0vPXSoJHdffeY-VIVIsHm2Jp9rPEaGhDgG8YYQtvUpPksSZEsk0_f_pfaUmojLmjNSnZ0m_Y4Z0y33Y/s400/PaujilLunchSpider2mmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDk66kuj-PjQhLgN7_3Fs4XrQdt5akH4Pf3dXgt2986GohaTNvITIsOaHUnNr5y0vPXSoJHdffeY-VIVIsHm2Jp9rPEaGhDgG8YYQtvUpPksSZEsk0_f_pfaUmojLmjNSnZ0m_Y4Z0y33Y/s1600/PaujilLunchSpider2mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br />
</a></div><div class="separator" style="clear: both; text-align: left;">Along one of the trails in the reserve, I found my first <i>Micrathena</i> spider. I was so excited to find it but a little frustrated because I felt a little rushed as the rest of the group kept on walking. In addition, my camera lens had gathered condensation due to high humidity levels. I was able to take one acceptable picture. <i>Micrathena </i>spiders are araneids (they build orbwebs) that have a typical arrow shape due to the spiny projections on their abdomen.</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLjC3y6QQww-OFbgQZqGd7egY58_sCHTRJjqpaIMPYNRPm6fJyT2IdZqfQF2ElKfW296jppfMT4FnGq2uSja2MGdjNce42saOeiPsS68W7ICZ-oB8tyCsJytngNls6H9GCkzqpIDUe3prS/s1600/Paujil-Micrathena1mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="297" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLjC3y6QQww-OFbgQZqGd7egY58_sCHTRJjqpaIMPYNRPm6fJyT2IdZqfQF2ElKfW296jppfMT4FnGq2uSja2MGdjNce42saOeiPsS68W7ICZ-oB8tyCsJytngNls6H9GCkzqpIDUe3prS/s400/Paujil-Micrathena1mmark.jpg" width="400" /></a></div><div style="text-align: left;"><br />
</div><div style="text-align: left;">On the side of a more open trail, I noticed many spiders like the ones below. Their translucent legs were hard to notice against the background vegetation. I think these were oxyopids, a family also known as the Lynx Spiders, due to their hunting strategy which consists in jumping and running after their prey, and their relatively good eyesight. I was able to take pictures of some spiders that had caught a prey item, including a fat caterpillar. Oxyopids have spiny legs, as seen in these pictures.</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxu-_S6diwBDtZbgE1Vcg_5L6dEB4LiUvdF2TCAC1jCwaUb2JhsaB87MjoYvN5CdVetdbB1E7bMDHnwBDyNU709hBNjgBH7aE1m7BSn8NkvG62V9Scqmy732RbpxRyJrMVuMzB81vYBTNm/s1600/PaujilOxyopeInd1Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="297" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxu-_S6diwBDtZbgE1Vcg_5L6dEB4LiUvdF2TCAC1jCwaUb2JhsaB87MjoYvN5CdVetdbB1E7bMDHnwBDyNU709hBNjgBH7aE1m7BSn8NkvG62V9Scqmy732RbpxRyJrMVuMzB81vYBTNm/s400/PaujilOxyopeInd1Mmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1Qhf-ld2cgNjXEIviy7h1vumqdH29ve-SdUHoDwkg_ffh3FkeAtoKsaAYsEK3CqAcDCQk4XRVKWuPRjAXh_1ifrp-Gu3IS_84EgjtKCIkJhhBdpT8hO3RSHwEqk8N9WipBRI4-n7XSIVH/s1600/PaujilRoadOxyopDipteraPreyMmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="301" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1Qhf-ld2cgNjXEIviy7h1vumqdH29ve-SdUHoDwkg_ffh3FkeAtoKsaAYsEK3CqAcDCQk4XRVKWuPRjAXh_1ifrp-Gu3IS_84EgjtKCIkJhhBdpT8hO3RSHwEqk8N9WipBRI4-n7XSIVH/s400/PaujilRoadOxyopDipteraPreyMmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjS3lXyhQoMNB-zHw_B0vPR9LsbnAnYGoEYYuBmjtGSsKgqX0HXpK1ffanyhD9UQf5G8y5NAfAKRYv6SExoA00a9r0AoCNVBRCsHzHex-DyJZIjFNiMkbki22P0Mm4B0bE2mJteUIHUXLk8/s1600/PaujilRoadOxyopCaterpillarM.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjS3lXyhQoMNB-zHw_B0vPR9LsbnAnYGoEYYuBmjtGSsKgqX0HXpK1ffanyhD9UQf5G8y5NAfAKRYv6SExoA00a9r0AoCNVBRCsHzHex-DyJZIjFNiMkbki22P0Mm4B0bE2mJteUIHUXLk8/s400/PaujilRoadOxyopCaterpillarM.jpg" width="306" /></a></div><div style="text-align: left;"><br />
</div><div style="text-align: left;">A red jumping spider caught my attention along another trail. It was very active and curious, and jumped on my camera a couple of times to investigate it. I had to place him back on the plant to take more pictures.</div><div style="text-align: center;"><br />
</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6hDhDT1JNGb67juuMLwDstIFe4GFUp-o7ahqFfQavLHNT5p7TgV3HmGcbl_LhYUx0IMWqTRNArhTel6lH9mXzYRxy1UoPBQ9n2gxGpacs6Lftj163hoXnkZecoZf6U9u0t2JtmX7b2v9U/s1600/PaujilRoadRedJumper2Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="282" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6hDhDT1JNGb67juuMLwDstIFe4GFUp-o7ahqFfQavLHNT5p7TgV3HmGcbl_LhYUx0IMWqTRNArhTel6lH9mXzYRxy1UoPBQ9n2gxGpacs6Lftj163hoXnkZecoZf6U9u0t2JtmX7b2v9U/s400/PaujilRoadRedJumper2Mmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiedqapv055UiKSP6qv-YV6oeru0CNwEiHthnlm8RD8vJ2zqxEA37ZfFbWi1bhaSdbEzsPHXxpObiZGfwzj-YuWpSiEE12tpolppPpN0qspdI1zvHkYbgov3sV_M9eRHaD4Uyv0hKUG4pVS/s1600/PaujilRoadRedJumper4Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="273" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiedqapv055UiKSP6qv-YV6oeru0CNwEiHthnlm8RD8vJ2zqxEA37ZfFbWi1bhaSdbEzsPHXxpObiZGfwzj-YuWpSiEE12tpolppPpN0qspdI1zvHkYbgov3sV_M9eRHaD4Uyv0hKUG4pVS/s400/PaujilRoadRedJumper4Mmark.jpg" width="400" /></a></div><div style="text-align: left;"><br />
</div><div style="text-align: left;">I found this other jumping spider in a very shaded area, where the canopy was dense:</div><div style="text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoiYS7KvlahWDGn3y6j02OrmPIQubKL7htQfM6xS994XLw_Q-OQtOzOH0WOyd6C5U2qwq6krqk1Yc4bjf9xr_HSV2rnAHslmN0IZejpb3tb_29ZjbKBBVxXnMDQ9L_-R5f87VRF5kKmDs8/s1600/PaujilSalticidBlackMmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoiYS7KvlahWDGn3y6j02OrmPIQubKL7htQfM6xS994XLw_Q-OQtOzOH0WOyd6C5U2qwq6krqk1Yc4bjf9xr_HSV2rnAHslmN0IZejpb3tb_29ZjbKBBVxXnMDQ9L_-R5f87VRF5kKmDs8/s400/PaujilSalticidBlackMmark.jpg" width="400" /></a></div><div style="text-align: left;"><br />
</div><div style="text-align: left;"><br />
</div><div style="text-align: left;">One orbweb along the trail had a pretty spiral shaped stabilimentum. In an attempt to find out who had built this web without scaring the spider away, I carefully placed my camera behind the web and took a picture at random, hoping that it would be in focus. My strategy worked and revealed that there indeed was a spider hiding under the stabilimentum, but I can't tell what spider this was. </div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZKqueAwvWXLJS0xR_DJNFO-2KSAQcdZGZqtB2SdTR6Vb9n4QVxqDUfdZv2RMR-jZAVVS6HWwHzHbLU48KW2SXY9D8vseV6vP8mugFzRyddEAQlIxwQERVxmRKkqG3_YDI5Z5BSnEp6sjP/s1600/PaujilRoadSpiralWeb2Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="296" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZKqueAwvWXLJS0xR_DJNFO-2KSAQcdZGZqtB2SdTR6Vb9n4QVxqDUfdZv2RMR-jZAVVS6HWwHzHbLU48KW2SXY9D8vseV6vP8mugFzRyddEAQlIxwQERVxmRKkqG3_YDI5Z5BSnEp6sjP/s400/PaujilRoadSpiralWeb2Mmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinivaDgNsChaQeO560Kzm9mcf8LZndkv61n0b3_WI-O35xVT8ou2GMntQ5u5dbrvU99cC8J1LswyIxY7-h2qNr58wwnERqNxWl5NsMgX87kwQ6cCQzDRhhH9TbeLguNDMOGdWRA4H_1uAR/s1600/PaujilRoadSpiralWeb3Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="287" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinivaDgNsChaQeO560Kzm9mcf8LZndkv61n0b3_WI-O35xVT8ou2GMntQ5u5dbrvU99cC8J1LswyIxY7-h2qNr58wwnERqNxWl5NsMgX87kwQ6cCQzDRhhH9TbeLguNDMOGdWRA4H_1uAR/s400/PaujilRoadSpiralWeb3Mmark.jpg" width="400" /></a></div><div style="text-align: center;"><br />
</div><div style="text-align: left;">One section of the trail was in close proximity to a river. Upon inspection of a big log, I noticed this beautiful orbweb spider. I had never seen this species before, but I think it may be a tetragnath spider of the genus <i>Leucauge</i>. Members of this genus have a cluster of long trichobothria (these are hair-like structures that detect vibrations) prolaterally at the base of their femurs on their fourth legs. These trichobothria are noticeable in the picture below. The second picture shows the orbweb, with relatively few radii and a "hole" in the center, which are typical tetragnath web characteristics.</div><div style="text-align: left;"><br />
</div><div style="text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLJo_LNCCq5ZPQ5RhAjxauh4cA5UKxEg7u4l7jX5J-M_Xx0DRFzEUHYLH78in5IOuVqoCzbxhMVpXjpODTzRfqJVg6N8ffVQb-lqxRo3XCNQwqgtGhwjBKolAIVipKk9T157tJqQtpAm0g/s1600/PaujilStreamSpider3M+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLJo_LNCCq5ZPQ5RhAjxauh4cA5UKxEg7u4l7jX5J-M_Xx0DRFzEUHYLH78in5IOuVqoCzbxhMVpXjpODTzRfqJVg6N8ffVQb-lqxRo3XCNQwqgtGhwjBKolAIVipKk9T157tJqQtpAm0g/s400/PaujilStreamSpider3M+mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_xx56P3k3FgmjRnNPFgnMNDKJ4pkhN6CBhXGXU7yvZtv05KS8rHlj7p5bnoJQWPfvqwaVCkaam1Yp9B8we_yBaq1kVZG3bsQ9CRthM9ciqazKBx-n3d-5YKvbgFXv7FXjDG2PqHDVCQAT/s1600/PaujilStreamSpider4M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="297" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_xx56P3k3FgmjRnNPFgnMNDKJ4pkhN6CBhXGXU7yvZtv05KS8rHlj7p5bnoJQWPfvqwaVCkaam1Yp9B8we_yBaq1kVZG3bsQ9CRthM9ciqazKBx-n3d-5YKvbgFXv7FXjDG2PqHDVCQAT/s400/PaujilStreamSpider4M.jpg" width="400" /></a></div><div style="text-align: center;"><br />
</div><div style="text-align: left;">Also by the river, we found this Pisaurid spider (also known as Fishing Spider) resting on a small tree trunk. These spiders are able to stay underwater for a few moments. They feed mainly on aquatic invertebrates and sometimes on small fish.</div><div style="text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIjJLSUerJ8cTg5kq65NYAlccWv1BaCalMbpJcycwNiU72icc_hvRlcsUOGfMLwwb-gGvVbuIMgGC1dxiij4B-BFmmJRyu6B6qkQufSxch8u7p9vLyqr8V1YoaCjlpJly9r0LE3fuDcgAH/s1600/PaujilTrunkSpiderMmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIjJLSUerJ8cTg5kq65NYAlccWv1BaCalMbpJcycwNiU72icc_hvRlcsUOGfMLwwb-gGvVbuIMgGC1dxiij4B-BFmmJRyu6B6qkQufSxch8u7p9vLyqr8V1YoaCjlpJly9r0LE3fuDcgAH/s400/PaujilTrunkSpiderMmark.jpg" width="300" /></a></div><div style="text-align: center;"><br />
</div><div style="text-align: left;">At night time, my cousin Esteban, Ryan and I went out exploring not too far from our cabin. We were rewarded with a small tarantula, which was wandering about right next to the steps that led to our cabin. Tarantulas have fangs that point straight down, whereas other spiders have fangs that cross each other.</div><div style="text-align: left;"><br />
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</div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com3tag:blogger.com,1999:blog-1778130159792537211.post-87205593045088985452011-07-19T09:20:00.000-07:002011-07-20T13:23:36.922-07:00Meanwhile, back in France..My mom sent me a couple of pictures of a spider she found in our house, in Brittany, France. This spider, which belongs to the family Pholcidae (cellar spiders), genus <i>Pholcus</i>, brings back memories from home, as I remember seeing these when I was younger. I remember throwing small paper balls in their webs to see if the spider would mistaken them for prey items. Instead, the spider would shake and vibrate in its web. I later found out that this shaking is a defense mechanism which makes the spider look blurry and therefore more difficult to catch.<br />
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This spider was surrounded by her offspring, which first looked like small dots in her web:<br />
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The second picture shows the same spider and her young, now a little older:<br />
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Pholcids are long-legged spiders that hang upside down in tangle webs, which they typically build in dark areas (cellars, caves), but sometimes also in warm areas inside houses.Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com2tag:blogger.com,1999:blog-1778130159792537211.post-66210647905405102332011-07-10T19:45:00.000-07:002011-07-20T13:24:10.540-07:00Payette river rafting tripMy friends and I went to Idaho for a few days of great rafting on the Payette river. We stayed at a nice campsite not far from Crouch, a small town that had the craziest 4th of July fireworks I had ever seen. Our campsite was located by the river and had enough trees to provide shade...and interesting spider habitat. I searched for spiders a couple of times between our rafting adventures.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiINMcC_EdVWGiZ4fz49lLAlReonchtFEIDPNdM7d21iDMi_PUxBa1yP6qhPLcKc6ZckHZhl-Q4JFqdFd0w952eyNyq8OH4slPS5ebrdiA5i3WpQljs4tF0XXWIcGZjnwuMXk_aq-v5oee7/s1600/P1060677M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiINMcC_EdVWGiZ4fz49lLAlReonchtFEIDPNdM7d21iDMi_PUxBa1yP6qhPLcKc6ZckHZhl-Q4JFqdFd0w952eyNyq8OH4slPS5ebrdiA5i3WpQljs4tF0XXWIcGZjnwuMXk_aq-v5oee7/s400/P1060677M.jpg" width="300" /></a></div><div style="text-align: center;"> View of the river from our campsite</div><div style="text-align: left;"><br />
</div><div style="text-align: left;">My first find was this dictynid spider, which did not look like the dictynid species at my field sites in Logan Canyon (Utah). I had to gently poke her out of her tangle web to get a better look.</div><div style="text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio0YVsRY2ntJI59Jc8nY66PkXn-Ug7Z-7jhxToiEJb3-dXzi3fwOPiRIJ2jzamLeQXiPUOFw0BAEE72rEP9sgpzsY3bJFs_m8SPGgIPUK4dsOBaaCvYo30Sh2oLwi1Fo6x20dtBPDCZCt1/s1600/P1060680M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="287" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio0YVsRY2ntJI59Jc8nY66PkXn-Ug7Z-7jhxToiEJb3-dXzi3fwOPiRIJ2jzamLeQXiPUOFw0BAEE72rEP9sgpzsY3bJFs_m8SPGgIPUK4dsOBaaCvYo30Sh2oLwi1Fo6x20dtBPDCZCt1/s400/P1060680M.jpg" width="400" /></a></div><div style="text-align: left;"><br />
</div><div style="text-align: left;">Close to the river, I noticed a male linyphiid spider in a sagebrush shrub. This spider was hanging upside down in its sheet-like web. When prey get caught in the web, linyphiid spiders bite them through the web while remaining upside down. </div><div style="text-align: left;"><br />
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</div>Anneli and Andy found this spider on the ground by our kitchen area. I have not seen this very cryptic looking species before, but I would guess that it is a philodromid spider, as it looks like a darker version of <i>Philodromus histrio</i>, a species common on sagebrush in Northern Utah. Philodromids are wandering spiders that do not rely on webs to catch prey. This family resembles the true crab spiders (Thomisidae) but philodromids have legs that are subequal in size whereas thomisids have third and fourth legs that are shorter than the first two pairs of legs.<br />
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One night, as we were chatting by the campfire, we noticed a small arthropod running around by our feet. Upon closer inspection, it turned out to be a solpugid!! Solpugids are also known as camel spiders but they are not spiders- they are a closely related order of arachnids. I was very surprised and excited to see one here, because I thought they were only found in desert areas. I guess that's not the case! Solpugids are typically nocturnal predators that use their impressive chelicerae to macerate their arthropod prey. I have heard that very little is known about solpugids because they are not easy find and difficult to keep in captivity. Perhaps this individual was hunting for arthopods that had been attracted to our campfire.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvnnfNt4ketz5Jr0reHyripgeZTI6Yn_qHfx_4iLyG98e19mRSBqbDQtTvD0XoHx9kh5fSU1XDkXHnspGkVdAVaiQcUvR1f2J3Xl_Yu3nQh0m3tUK_QveDpaW-D9R5TPcVfod6YgirDUFy/s1600/P1060650CR.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="283" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvnnfNt4ketz5Jr0reHyripgeZTI6Yn_qHfx_4iLyG98e19mRSBqbDQtTvD0XoHx9kh5fSU1XDkXHnspGkVdAVaiQcUvR1f2J3Xl_Yu3nQh0m3tUK_QveDpaW-D9R5TPcVfod6YgirDUFy/s400/P1060650CR.jpg" width="400" /></a></div><div style="text-align: center;">Solpugid hunting next to our campfire</div><div style="text-align: center;"><br />
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That night I went to bed a little after midnight. As I was starting to fall asleep in my tent, I felt something walking on my arm. I turned on my headlamp and saw something hop straight onto the light! It turned out be a <i>Phidippus</i> jumping spider. I took a quick picture of it, let it out of the tent and went back to sleep. Jumping spiders are diurnal predators, but it has been shown that they sometimes use artificial light to hunt at night. This paper by Frank (2009) has some information on the subject:<br />
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Frank KD (2009) Exploitation of artificial light at night by a diurnal jumping spider. Peckhamia 78.1:1-3<br />
<a href="http://peckhamia.com/peckhamia/PECKHAMIA%2078.1.pdf">http://peckhamia.com/peckhamia/PECKHAMIA%2078.1.pdf</a> <br />
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<div style="text-align: center;"><i>Phidippus</i> attracted to my headlamp. Picture taken after midnight.</div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com2tag:blogger.com,1999:blog-1778130159792537211.post-27020110003532355072011-07-02T09:37:00.000-07:002011-07-20T13:24:50.598-07:00House spidersSometimes one doesn't need to go far to find spiders. Some spiders are quite happy inside houses (especially if you don't clean things too often). Our house is of course very clean, but once in a while we get some neat spiders. Today I will focus on a particular microhabitat: the windows in the south-west corner of our house.<br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPb6gVJenRFdU-venKGnFtz-uj0gHG3rW54xOV-69U-DAWJoo8XkZV3-d1XipnHL0lBTs0UwgkYVKFZJu4JPvoJUxfvEXB5KEjeLykgdkSqzvqM8VcT0Wx9LFTYmj783ERtg5F_ZbZskwP/s1600/P1060614png.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPb6gVJenRFdU-venKGnFtz-uj0gHG3rW54xOV-69U-DAWJoo8XkZV3-d1XipnHL0lBTs0UwgkYVKFZJu4JPvoJUxfvEXB5KEjeLykgdkSqzvqM8VcT0Wx9LFTYmj783ERtg5F_ZbZskwP/s400/P1060614png.png" width="300" /> </a></div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: left;">While I was eating breakfast, I noticed on the wall above the window a big <i>Phidippus</i> jumping spider. This one is probably <i>Phidippus audax</i> (a.k.a. the Daring Jumping Spider), a black species with abdominal spots that are white in adults and sometimes orange in immature individuals. For some reason, I have never seen this species in the mountains, where I do my field work-I have only seen it down in the valley. The only <i>Phidippus</i> I have seen in the mountains is <i>P. johnsoni. </i> </div><div class="separator" style="clear: both; text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVe33kx9iHbP5kSuR_fKmOSVzb0io3MoQsozTqUozhEi7UzohWEaPp9QU7jSzy_GnKZMPAuImUwSlF7uh3TL5QknvfAiDUcUgqAmajvCly1O8tbFjEmVtQcS050cBXwN_78m33FBOJWb88/s1600/P1060577mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="282" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVe33kx9iHbP5kSuR_fKmOSVzb0io3MoQsozTqUozhEi7UzohWEaPp9QU7jSzy_GnKZMPAuImUwSlF7uh3TL5QknvfAiDUcUgqAmajvCly1O8tbFjEmVtQcS050cBXwN_78m33FBOJWb88/s400/P1060577mmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCjfnw5-HTp-eo0-ecgnTwWE6ZEBaZgPcQwKgO5NGidO-3DxVMiCZJUCJZBr_4C3i1yxAcBlkY_WEOw9-GeXoUY0K8PnH31Y94ja_8cea5t8-vcJlhgcat4WPyf5gLCfxI7NPkF2yQ9KYy/s1600/P1060567m+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="311" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCjfnw5-HTp-eo0-ecgnTwWE6ZEBaZgPcQwKgO5NGidO-3DxVMiCZJUCJZBr_4C3i1yxAcBlkY_WEOw9-GeXoUY0K8PnH31Y94ja_8cea5t8-vcJlhgcat4WPyf5gLCfxI7NPkF2yQ9KYy/s400/P1060567m+mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPPnkZeswDTMnRlKIKTI3QNmLL6_ilikT9gQtcYZqOQzfcY3_4oH0bFioDs3ZqgixSD8m1jQszcDk7nGS0_XZyoFss_Wz3m4OSGWtNfTlA1QEq31ANRB0_2YStPR3dBPYaM70n2PoBUiD7/s1600/P1060579m.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPPnkZeswDTMnRlKIKTI3QNmLL6_ilikT9gQtcYZqOQzfcY3_4oH0bFioDs3ZqgixSD8m1jQszcDk7nGS0_XZyoFss_Wz3m4OSGWtNfTlA1QEq31ANRB0_2YStPR3dBPYaM70n2PoBUiD7/s400/P1060579m.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><i>Phidippus</i> (prob. <i>audax</i>)</div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: left;">I found a second jumping spider by the window, a very small immature <i>Platycryptus</i>. Spiders in this genus have a mottled pattern on the abdomen and a flat body that allows them to hide in tight places. I have often seen these spiders wandering outside on the house walls. </div><div class="separator" style="clear: both; text-align: left;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8sawWTp9DM-Lh5tWIounmPW3riYyJe1bo1k8m2q8i0UFdXt4cm_EnCZFvy0NMwy8_fmapsYjy7IotS9YLCFWYBFVIIiTMoDae-Mc_ic36XX1kg-9nVh3w5F3hJ-rRSjq-BqLDRXF-tJA1/s1600/P1060581mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="283" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8sawWTp9DM-Lh5tWIounmPW3riYyJe1bo1k8m2q8i0UFdXt4cm_EnCZFvy0NMwy8_fmapsYjy7IotS9YLCFWYBFVIIiTMoDae-Mc_ic36XX1kg-9nVh3w5F3hJ-rRSjq-BqLDRXF-tJA1/s400/P1060581mmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"> <i>Platycryptus</i> jumping spider</div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: left;">Perhaps jumping spiders favor window areas as hunting grounds inside houses because they are diurnal spiders that rely on their excellent vision to find prey. </div><div class="separator" style="clear: both; text-align: left;"><br />
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</div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com3tag:blogger.com,1999:blog-1778130159792537211.post-68011324773442735032011-06-30T09:36:00.000-07:002011-07-20T13:25:31.258-07:00Bear River BottomsLast Sunday, Ryan O'Donnell and I went to the Bear River Bottoms, part of a wetland area that has recently been dedicated as a conservation easement. The vegetation was structurally simple along the part of the trail we covered, consisting mainly of grasses (Reed Canarygrass) and herbs, with a few scattered trees (mainly Russian Olive) and hardly any shrubs.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAoxA0D42z0Z5PXi55g9j_Vo3yVlhqPuuOlvckmMDKfgTVFO9yKbPFQdqLMXcbWqyaauyzOABANVhyC8WEl3YTIUXpLopjT6S5b8uVSqnVoSUqhuImZ2kziVCyQmnQ7WtBitpWuTcOPx2f/s1600/P1060521.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAoxA0D42z0Z5PXi55g9j_Vo3yVlhqPuuOlvckmMDKfgTVFO9yKbPFQdqLMXcbWqyaauyzOABANVhyC8WEl3YTIUXpLopjT6S5b8uVSqnVoSUqhuImZ2kziVCyQmnQ7WtBitpWuTcOPx2f/s400/P1060521.JPG" width="400" /></a></div><div style="text-align: center;"> Bear River Bottoms</div><br />
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While Ryan searched for birds, I searched for spiders. A close inspection of the Reed Canarygrass flowers revealed the presence of dictynids, which appeared to like these pink flowers for their webs. Since dictynids build tangle-webs, they require substrates that can hold a three-dimensional web. Dictynids are also known to prefer the tips of plants in general. Many of the Reed Canarygrass flowers contained one individual dictynid in a web. I had to poke the spiders gently out of their webs so that they would appear in the pictures. Given the abundance of this invasive grass, I quickly realized that this spider must be extremely abundant at this site.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigEnOg5jBG7nyPvZOJ11fWeDL0TgLgRLqxUFYtw2RsNHA5tKwtaiZv_8nCCWXT5EmnwCqroqOuT-6JuNC1mo8_M5sxShYbEPdGIzqA1tbVF-ARuI4NXQLq966xyQWGp7kbGHyj-MHbTTG9/s1600/P1060489m+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="315" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigEnOg5jBG7nyPvZOJ11fWeDL0TgLgRLqxUFYtw2RsNHA5tKwtaiZv_8nCCWXT5EmnwCqroqOuT-6JuNC1mo8_M5sxShYbEPdGIzqA1tbVF-ARuI4NXQLq966xyQWGp7kbGHyj-MHbTTG9/s400/P1060489m+mark.jpg" width="400" /></a></div><div style="text-align: center;">Male dictynid on Reed Canarygrass</div><div style="text-align: center;"><br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1sq887Yxwvq3yCHs4YzLaKNGFssrZ4AUht0SrG1-jGkiMz5XXNOlp5V47XSvY5k4tGZ6W9f6gQvAiTW3cKPqzcuyYMsKGqlnJS1N5z0WAjKXsYhamJSt57pMA7AUk4vnPChiRKpDYlSC3/s1600/P1060512Mmarked.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="297" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1sq887Yxwvq3yCHs4YzLaKNGFssrZ4AUht0SrG1-jGkiMz5XXNOlp5V47XSvY5k4tGZ6W9f6gQvAiTW3cKPqzcuyYMsKGqlnJS1N5z0WAjKXsYhamJSt57pMA7AUk4vnPChiRKpDYlSC3/s400/P1060512Mmarked.jpg" width="400" /></a></div><div style="text-align: center;">Female dictynid on Reed Canarygrass</div><br />
Dictynids were also present in Canadian Thistle (yet another invasive plant), among other plants. I had a hard time taking pictures because of hundreds of hungry mosquitoes. I also had to deal with ant nests, which were often hard to notice because of the grass.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTVgKneu3xdY5LVnbbb13SwqWZ6DfR9MGSNcCYpwBoLtIusSK1gwepH0q97ouJt_0wFqO3qG9fKpIo8VyNtq2sfeLxBsMjwMP4Gkz8LnM2KwDadxJfnH6mcaM8_8jNkUNK5IMhHwsULEl_/s1600/P1060546m+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="287" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTVgKneu3xdY5LVnbbb13SwqWZ6DfR9MGSNcCYpwBoLtIusSK1gwepH0q97ouJt_0wFqO3qG9fKpIo8VyNtq2sfeLxBsMjwMP4Gkz8LnM2KwDadxJfnH6mcaM8_8jNkUNK5IMhHwsULEl_/s400/P1060546m+mark.jpg" width="400" /></a></div><div style="text-align: center;"> Dictynid on thistle</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhUOzUjX9om-Z78yRvyn68JWQWQf6iZq_Fzm5FtzIXE-T8s32AmyRGJnxISRiGIiFGC67BKjiXjYYca4TQ02YqfXj8f0CSPwtineZVagfenVy3tc51PNciEQS30JopgCmAM24ClsGRjvsAv/s1600/P1060550.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhUOzUjX9om-Z78yRvyn68JWQWQf6iZq_Fzm5FtzIXE-T8s32AmyRGJnxISRiGIiFGC67BKjiXjYYca4TQ02YqfXj8f0CSPwtineZVagfenVy3tc51PNciEQS30JopgCmAM24ClsGRjvsAv/s400/P1060550.JPG" width="400" /></a></div><div style="text-align: center;">Ant attack while taking the picture above</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdYfaFUmIs47902TDcYRcjwateOpJPQi8vaiAg8uSmdDAOqXmGBIE_4uoa_IBStqup_Oqs0CfYshWLIquVVoRRLEJE9YqS6hJA9SA4O8JX5baOx0BbOIGzuaeab2cvZhVRJeFLoStRZ-iL/s1600/P1060554m+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="308" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdYfaFUmIs47902TDcYRcjwateOpJPQi8vaiAg8uSmdDAOqXmGBIE_4uoa_IBStqup_Oqs0CfYshWLIquVVoRRLEJE9YqS6hJA9SA4O8JX5baOx0BbOIGzuaeab2cvZhVRJeFLoStRZ-iL/s400/P1060554m+mark.jpg" width="400" /></a></div><div style="text-align: center;">Dictynid in her web</div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com0tag:blogger.com,1999:blog-1778130159792537211.post-1539626139529868672011-06-26T20:15:00.000-07:002011-07-20T13:26:14.940-07:00Hike to the "billboards" on the peak just east of Logan<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2eYlSCeEb1wAppoT7rSVqjEWMXcH_jvZ_wxa9lUNc0qM2UvTzpXzN741SZSZu5cEPnY8ax8hahMaEyoEe0z7Lvk2D-pyJqZPiY13qSvbHCXoPM0BgPf5mT4k55H2SxmcU_Q3ztsPdMuyE/s1600/P1050962.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br />
</a></div>Earlier this month, I hiked up a trail that starts along the Shoreline trail at the mouth of Green Canyon, up to the top of the mountain just east of Logan, where two billboard-looking structures face each other. It was a little steep at times and I lost the trail near the top, but it was really worth the hike, with a nice view of Logan from up there. <br />
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<div style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2eYlSCeEb1wAppoT7rSVqjEWMXcH_jvZ_wxa9lUNc0qM2UvTzpXzN741SZSZu5cEPnY8ax8hahMaEyoEe0z7Lvk2D-pyJqZPiY13qSvbHCXoPM0BgPf5mT4k55H2SxmcU_Q3ztsPdMuyE/s1600/P1050962.JPG" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2eYlSCeEb1wAppoT7rSVqjEWMXcH_jvZ_wxa9lUNc0qM2UvTzpXzN741SZSZu5cEPnY8ax8hahMaEyoEe0z7Lvk2D-pyJqZPiY13qSvbHCXoPM0BgPf5mT4k55H2SxmcU_Q3ztsPdMuyE/s400/P1050962.JPG" width="400" /> </a></div><div style="text-align: center;">View of Logan from the lower part of the trail<br />
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</div><div style="text-align: center;"></div><div style="text-align: center;"></div><div style="text-align: left;">I had some nice encounters along the trail, including Sagebrush Lizards, a Turkey Vulture and a couple of American Kestrels. My first spider was a little salticid which was hard to notice against the pale rock it was sitting on:<br />
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</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXXuCDZOzLBmL-Y4mHjxzFUtIFNxymCZ8slx5QXheXNhQwRF5cVmYaTafXSjPXpYS9d1Mh5TnBfYEH6BoRjmCLcXAXuaupMgb1P631vgMSM38kdTwlVMFq3enafPNSAZcfeYrk6F4HliRu/s1600/P1060121CR.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXXuCDZOzLBmL-Y4mHjxzFUtIFNxymCZ8slx5QXheXNhQwRF5cVmYaTafXSjPXpYS9d1Mh5TnBfYEH6BoRjmCLcXAXuaupMgb1P631vgMSM38kdTwlVMFq3enafPNSAZcfeYrk6F4HliRu/s400/P1060121CR.jpg" width="300" /> </a></div><div class="separator" style="clear: both; text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: left;">Further up the trail I found another jumping spider, also on a rock. He was a little shy, and he quickly bounced off the rock to hide under a plant. He hung from the plant upside-down for a while, making sure he could still observe the suspicious camera. </div><div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGsGYphIEC51y05tD0l6tXmRCKeMy6SkAfAkODb6NBohXpnsV3SEljSx1WluQM3d61JysHW05DqaS-hi798JFnPcrZGrlohyj5CanOPUOgzkyvpulL49FDlUKaViXjY5FIVrm2JoclmAh9/s1600/P1060027CR2mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="303" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGsGYphIEC51y05tD0l6tXmRCKeMy6SkAfAkODb6NBohXpnsV3SEljSx1WluQM3d61JysHW05DqaS-hi798JFnPcrZGrlohyj5CanOPUOgzkyvpulL49FDlUKaViXjY5FIVrm2JoclmAh9/s400/P1060027CR2mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFJ8OJ3Tzn-q4k40i8fscL3OdZ454tvclbkobBYi3duZemAZtMi1btE_rmChgMUr69n8X2UHq9HVaUz74ff5p5gtg6Rq1cVnGe_FkRlRA0BQVLxblZQL107NYnDqtm3o3J-2dwLKAzj0Hj/s1600/P1060031big+copy.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="317" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFJ8OJ3Tzn-q4k40i8fscL3OdZ454tvclbkobBYi3duZemAZtMi1btE_rmChgMUr69n8X2UHq9HVaUz74ff5p5gtg6Rq1cVnGe_FkRlRA0BQVLxblZQL107NYnDqtm3o3J-2dwLKAzj0Hj/s400/P1060031big+copy.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div style="text-align: left;"></div><div style="text-align: left;"><br />
There was still some snow close to the top, where the billboards are located. I noticed a wolf spider next to a small patch of snow. Like jumping spiders, lycosids do not build webs to catch prey. Instead, they rely on their good eyesight to actively hunt.<br />
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</div><div style="text-align: left;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhI0Ln29lIWb38Fy4HqXIaFp46WKSx4VBjBvrzRQbrpvdWYbQvsfB5HBJXXdtqK6dY2zI2fmbtq48-keq9c3lE4qhe4uYO28BGb4G7SBK7EiaArDBNCMRkca3M7wekNb3jXHa9yHF9kPapm/s1600/P1060107CRmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="308" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhI0Ln29lIWb38Fy4HqXIaFp46WKSx4VBjBvrzRQbrpvdWYbQvsfB5HBJXXdtqK6dY2zI2fmbtq48-keq9c3lE4qhe4uYO28BGb4G7SBK7EiaArDBNCMRkca3M7wekNb3jXHa9yHF9kPapm/s400/P1060107CRmark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFHSx_LdZjExqRF54dp6Nr-3weYmd8uHa0FJKtmlJXvyDJRCKD4zXgAf2agSOHrosBmprKFg05A2WGa2ed7JYnKQXeAhqpBgWDeQRlqzASaA-bgSWmakNrXAmpXjYo4J2mITtB5cvYNnEt/s1600/P1060109CRmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="285" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFHSx_LdZjExqRF54dp6Nr-3weYmd8uHa0FJKtmlJXvyDJRCKD4zXgAf2agSOHrosBmprKFg05A2WGa2ed7JYnKQXeAhqpBgWDeQRlqzASaA-bgSWmakNrXAmpXjYo4J2mITtB5cvYNnEt/s400/P1060109CRmark.jpg" width="400" /></a></div><div style="text-align: left;"></div><div style="text-align: left;"><br />
On my way down the trail, not far from the Shoreline trail, I noticed a <i>Phidippus johnsoni</i>, a pretty jumping spider with metallic green chelicerae (these are the mouthparts). I always enjoy looking at spiders in this genus as they can get quite big and typically have these pretty iridescent chelicerae. <i>Phidippus johnsoni</i> has a bright red abdomen, hence its name "Redbacked Jumping Spider".</div><div style="text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivIeLcAEs9hK9sal_EB6_xBbzbN2vVhtEaeQOvPzs0Ag3eP-C8ugESovDfENP92cTTyrYY1pykr_y8Fme-3qpx8JO0K55DFNVS797k2PdOHIT8z8G9-hRvqkcH3Qc9HUrmHkkmd7XUshsd/s1600/P1060135CR+mark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="301" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivIeLcAEs9hK9sal_EB6_xBbzbN2vVhtEaeQOvPzs0Ag3eP-C8ugESovDfENP92cTTyrYY1pykr_y8Fme-3qpx8JO0K55DFNVS797k2PdOHIT8z8G9-hRvqkcH3Qc9HUrmHkkmd7XUshsd/s400/P1060135CR+mark.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0lIcYenFg0WUPFXA3_qh899EdryvMJjWgBfV-E_w8qo70omAnDvnqiVbQzvh_mrLXoC99LKC__53jewOl54zlZzDTGBLl8D7Y77nkwbGc3IBMHs7GchaFhvJHYPISaXb_mECHMFzo_eq6/s1600/P1060136CR.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="296" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0lIcYenFg0WUPFXA3_qh899EdryvMJjWgBfV-E_w8qo70omAnDvnqiVbQzvh_mrLXoC99LKC__53jewOl54zlZzDTGBLl8D7Y77nkwbGc3IBMHs7GchaFhvJHYPISaXb_mECHMFzo_eq6/s400/P1060136CR.jpg" width="400" /></a></div><div style="text-align: left;"><br />
</div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com1tag:blogger.com,1999:blog-1778130159792537211.post-31095335960051105182011-06-25T11:11:00.000-07:002011-07-20T13:26:42.416-07:00Spiders at the USU Green Canyon Field StationYesterday, after a big lunch at Tandoori Oven, Lori Spears and I went to the USU field station at the mouth of Green Canyon to search for spiders in sagebrush shrubs. Lori and I have spent many hours in the field studying spiders in sagebrush habitat for our graduate research, but we felt we needed more spider pictures for future research presentations, including our defense.<br />
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We probably didn't chose the best time of day (it was quite hot) but we couldn't wait to look for spiders. However, we did find some jumping spiders (<i>Sassacus papenhoei</i>, <i>Pelegrina aenola</i>), crab spiders (<i>Xysticus spp</i>., <i>Misumena vatia</i>), a theridiid (<i>Theridion petraeum</i>), an araneid (<i>Metepeira foxi</i>) and a philodromid (<i>Philodromus histrio</i>). I had a hard time taking pictures of the jumping spiders, because most of them were still immature and quite active. However, I did find a <i>Pelegrina aenola</i> that allowed me to get close enough.<br />
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<div style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4I3k3C9Yh01RC5t3Ps3l8mmmlh72teYuoErImTZeDGkY8_IWa01bXylaLQpBsaXMs_K8LUn6W2HQjj9Fk5kUk1W7jij5gdDJTPhItqnSC25tfeGbvdCk8skTcHEXq0qxXlZ7SAoYnNpWT/s1600/P1060370CRburmark.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="292" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4I3k3C9Yh01RC5t3Ps3l8mmmlh72teYuoErImTZeDGkY8_IWa01bXylaLQpBsaXMs_K8LUn6W2HQjj9Fk5kUk1W7jij5gdDJTPhItqnSC25tfeGbvdCk8skTcHEXq0qxXlZ7SAoYnNpWT/s400/P1060370CRburmark.jpg" width="400" /> </a></div><div style="text-align: center;"><i>Pelegrina </i>jumping spider</div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgs2mIloTvVNjyETCNZR24IeNplAwBXwtXLd8mew8mK8pwXtkqhcBKRNNmmtE6kgSqIumkvKUCn6B4LFOt1VQ-MQ-h2ZNq252EVmyzd7jhEyVhhCZHdWrpQL6c_3whe01MWpUTpcdjtNcxY/s1600/P1060427Mmark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgs2mIloTvVNjyETCNZR24IeNplAwBXwtXLd8mew8mK8pwXtkqhcBKRNNmmtE6kgSqIumkvKUCn6B4LFOt1VQ-MQ-h2ZNq252EVmyzd7jhEyVhhCZHdWrpQL6c_3whe01MWpUTpcdjtNcxY/s400/P1060427Mmark.jpg" width="400" /> </a></div><div style="text-align: center;"><i>Metepeira</i> in her web<br />
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</div><div style="text-align: left;"></div><div style="text-align: left;"></div><div style="text-align: left;">I found a male goldenrod crab spider (<i>Misumena vatia</i>) on the tip a sagebrush branch. People are usually more familiar with the female of this species, who may be white or yellow depending on the flower she is sitting on. This male had produced a floating line of silk from his spinnerets, his posture much like that of an immature spider about to balloon. When his line caught the branch tip of a neighboring shrub, he turned around, held the line with one of his front legs, and pulled it as if checking that it was safely attached . A second later, he was traveling along the silk line to another shrub.</div><div style="text-align: left;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQ0P20B_NqTFRhpdYdKRW4jhwalDTalcAMDlT4rusqpP3uExJHoA35HLD_IuM4-7CPj3oz1MgW1YZStp4feDmbzj5cbxeWuEsGRhbPJHVEHqA24yPOWA4bWZFFu7a7ACodz5SLe30peF5p/s1600/P1060402M.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="295" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQ0P20B_NqTFRhpdYdKRW4jhwalDTalcAMDlT4rusqpP3uExJHoA35HLD_IuM4-7CPj3oz1MgW1YZStp4feDmbzj5cbxeWuEsGRhbPJHVEHqA24yPOWA4bWZFFu7a7ACodz5SLe30peF5p/s400/P1060402M.jpg" width="400" /></a></div><div style="text-align: left;"></div><div style="text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWSPzLITfkOyzccTK84fPDR4Epqo4MyyGNxNICiH3aE6xJbt2Fs3tYtRrbnKwytuF1F1kOgrRYQhn6nxdmtTLHnwu1_G5PK90J6KBnwUL7QBUIHluYjPmff8YpNafPCfWcrQ3D-3JTd33y/s1600/P1060406MMark.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWSPzLITfkOyzccTK84fPDR4Epqo4MyyGNxNICiH3aE6xJbt2Fs3tYtRrbnKwytuF1F1kOgrRYQhn6nxdmtTLHnwu1_G5PK90J6KBnwUL7QBUIHluYjPmff8YpNafPCfWcrQ3D-3JTd33y/s400/P1060406MMark.jpg" width="400" /></a></div><div style="text-align: center;"><br />
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</div><div style="text-align: center;"></div>Stephanie Cobboldhttp://www.blogger.com/profile/15909312308009202253noreply@blogger.com1