control prey detection ability in diff web sector

control prey detection ability in diff web sector -...

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doi: 10.1098/rspb.2009.1583 , 29-33 first published online 7 October 2009 277 2010 Proc. R. Soc. B Kensuke Nakata thread tension its prey-detection ability in different web sectors by adjusting Attention focusing in a sit-and-wait forager: a spider controls References http://rspb.royalsocietypublishing.org/content/277/1678/29.full.html#related-urls Article cited in: http://rspb.royalsocietypublishing.org/content/277/1678/29.full.html#ref-list-1 This article cites 17 articles, 3 of which can be accessed free Subject collections (1875 articles) ecology (1568 articles) behaviour Articles on similar topics can be found in the following collections 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://rspb.royalsocietypublishing.org/subscriptions go to: Proc. R. Soc. B To subscribe to This journal is © 2010 The Royal Society on November 7, 2010 rspb.royalsocietypublishing.org Downloaded from
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Attention focusing in a sit-and-wait forager: a spider controls its prey-detection ability in different web sectors by adjusting thread tension Kensuke Nakata * Department of Contemporary Law, Tokyo Keizai University, Minami-machi 1-7-34, Kokubunji, Tokyo 185-8502, Japan Focusing attention is a way for animals to search for and to obtain food efficiently. This study examines whether a sit-and-wait forager, the orb-web spider Cyclosa octotuberculata , focuses its attention on limited foraging areas. Video records of foraging activity revealed that the spiders detected prey trapped in the west and east sectors of their web less frequently than prey trapped in the north and south sectors. Comparison of photos of the web hub area with and without spiders present revealed that the spiders pulled radii towards the centre when waiting for prey. Radius pulling is stronger in the north and south web sectors than in the west and east sectors, possibly causing more tension in radii running verti- cally. Experimental manipulation indicated that the spiders responded to prey quicker when thread tension was increased. The results suggest that C. octotuberculata focus their attention on the web areas above and below the spider by adjusting the tension in web threads; and this causes higher prey detection rates in these areas. Keywords: spider; attention; orb web; foraging; sense 1. INTRODUCTION Foraging animals often direct their search activities towards pre-determined targets or areas which become the focus of their attention. Foragers using search image limit their search to particular targets within an array of various potential food items ( Langley 1996 ), whereas other foragers spatially concentrate their search efforts on a limited area, a phenomenon referred to as area- restricted search ( Fauchald & Tveraa 2003 ). These strategies allow animals to discard or filter out excess sensory information that could overwhelm their cognitive resources, and can raise prey detection rates and enhance foraging efficiency ( Dukas & Kamil 2001 ).
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