architectually built webs

architectually built webs - doi: 10.1098/rsbl.2007.0218 ,...

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Unformatted text preview: doi: 10.1098/rsbl.2007.0218 , 456-458 3 2007 Biol. Lett. Todd A Blackledge and Chad M Eliason architecturally constrained in spider orb webs Functionally independent components of prey capture are References http://rsbl.royalsocietypublishing.org/content/3/5/456.full.html#related-urls Article cited in: http://rsbl.royalsocietypublishing.org/content/3/5/456.full.html#ref-list-1 This article cites 17 articles, 1 of which can be accessed free Email alerting service here right-hand corner of the article or click Receive free email alerts when new articles cite this article - sign up in the box at the top http://rsbl.royalsocietypublishing.org/subscriptions go to: Biol. Lett. To subscribe to This journal is 2007 The Royal Society on November 6, 2010 rsbl.royalsocietypublishing.org Downloaded from Biol. Lett. (2007) 3 , 456458 doi:10.1098/rsbl.2007.0218 Published online 3 July 2007 Animal behaviour Functionally independent components of prey capture are architecturally constrained in spider orb webs Todd A. Blackledge 1, * and Chad M. Eliason 2 1 Department of Biology, The University of Akron, Akron, OH 44325-3908, USA 2 Department of Curricular and Instructional Studies, The University of Akron, Akron, OH 44325-4205, USA * Author for correspondence ( blackledge@uakron.edu ). Evolutionary conflict in trait performance under different ecological contexts is common, but may also arise from functional coupling between traits operating within the same context. Orb webs first intercept and then retain insects long enough to be attacked by spiders. Improving either function increases prey capture and they are largely determined by different aspects of web architecture. We manipulated the mesh width of orbs to investigate its effect, along with web size, on prey capture by spiders and found that they functioned independently. Probability of prey capture increased with web size but was not affected by mesh width. Conversely, spiders on narrow-meshed webs were almost three times more likely to capture energetically profit- able large insects, which demand greater prey retention. Yet, the two functions are still con- strained during web spinning because increasing mesh width maximizes web size and hence interception, while retention is improved by decreasing mesh width because more silk adheres to insects. The architectural coupling between prey interception and retention has probably played a key role in both the macro- evolution of orb web shape and the expression of plasticity in the spinning behaviours of spiders. Keywords: Araneidae; behavioural correlations; phenotypic plasticity; silk; tradeoff; web efficiency 1. INTRODUCTION Evolutionary conflict in organismal performance in different ecological contexts is common ( Sih et al....
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This note was uploaded on 01/27/2012 for the course ECOLOGY 300 taught by Professor Zumdahli during the Spring '11 term at St. Mary NE.

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architectually built webs - doi: 10.1098/rsbl.2007.0218 ,...

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