Why do orb-weaving spiders (Cyclosa ginnaga) decorate their webs with silk spirals and plant detritus?
Why do orb-weaving spiders (Cyclosa ginnaga) decorate their webs with silk spirals and plant detritus?
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DOI：
10.1016/j.anbehav.2009.10.025
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发表时间：
2010-01-01
期刊：
影响因子：
2.5
通讯作者：
Li, Daiqin
中科院分区：
文献类型：
--
作者：
Tan, Eunice J.;Stanley, W. H. Seah;Li, Daiqin
为了提高觅食的成功率或提高生存率，动物可能会发出错误的信号来误导猎物或捕食者。网络装饰据称是一些圆织蜘蛛建造的结构，用于传递欺骗性信号。金环蛛将各种丝（丝装饰）和植物材料（植物碎屑装饰）结合到其网中作为装饰。有人假设，网装饰是欺骗性的信号，要么吸引猎物，通过伪装提供保护或作为警告信号。然而，尽管有许多关于网页装饰的研究，它们的功能仍然难以捉摸，因为相互矛盾的结果。结合现场录像和定量分析。本文通过对斑翅目捕食者和雀形目鸟类捕食者视觉系统中颜色对比的研究，对C. ginnaga。与未装饰的网相比，丝绸装饰的网和较小程度上的植物装饰的网拦截了更多的猎物，从而提高了觅食的成功率。这支持了猎物吸引假说，但是，我们不能排除捕食者防御假说，因为没有捕食蜘蛛观察到的任何网络有或没有装饰。(C)2009年，动物行为研究协会。由Elsevier Ltd.出版。保留所有权利。
To improve foraging success or to enhance survival, animals may give out false signals to mislead prey or predators. Web decorations are purported to be structures that some orb-weaving spiders build to transmit deceptive signals to their advantage. Cyclosa ginnaga incorporates a variety of silk (silk decorations) and plant materials (plant detritus decorations) into its webs as decorations. It has been hypothesized that web decorations are deceptive signals that either attract prey, provide protection through camouflage or act as a warning signal. Nevertheless, despite numerous studies on web decorations, their function has remained elusive because of conflicting results. Using a combination of field video recording and the quanti. cation of colour contrasts in the visual systems of hymenopteran prey and passerine bird predators, we tested two functional hypotheses (prey attraction and predator defence) of two forms of web decorations (silk spiral and plant detritus) built by C. ginnaga. Silk-decorated, and to a lesser extent plant-decorated, webs intercepted more prey than undecorated webs, thus improving foraging success. This supports the prey attraction hypothesis; however, we could not rule out the predator defence hypothesis because there was no predation on spiders observed for any web with or without decorations. (C) 2009 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.