Predator perception of detritus and eggsac decorations spun by orb-web spiders Cyclosa octotuberculata:Do they function to camouflage the spiders?  

作　　者：Wenjin GAN Fengxiang LIU Zengtao ZHANG Daiqin LI 

机构地区：[1]College of Life Sciences, Hubei University, Hubei, Wuhan 430062, China [2]Department of Biological Sciences, National University of Singapore, Singapore 117543

出　　处：《Current Zoology》2010年第3期379-387,共9页动物学报（英文版）

基　　金：supported by a grant from NSFC (30770332);The Ministry of Education (MOE) Academic Research Fund (AcRF)(R-154-000-335-112)

摘　　要：Camouflage is one of the most widespread and powerful strategies that animals use to make detection/recognition more difficult. Many orb-web spiders of the genus Cyclosa add prey remains, plant debris, moults, and/or eggsacs to their webs called web decorations. Web decorations resembling spider body colour pattern have been considered to camouflage the spider from predators. While this camouflage is obvious from a human＇s perspective, it has rarely been investigated from a predator＇s perspective. In this study, we tested the visibility of web decorations by calculating chromatic and achromatic contrasts of detritus and eggsae decorations built by Cyclosa octotubereulata, against four different backgrounds viewed by both bird （e.g., blue tits） and hymenopteran （e.g. wasps） predators. We showed that both juvenile and adult spiders on webs with detritus or egg-sac deco- rations were undetectable by both hymenopteran and bird predators over short and long distances. Our results thus suggest that decorating webs with detritus or eggsacs by C octotuberculata may camouflage the spiders from both hymenopteran and bird predators in their common habitats [Current Zoology 56 （3）： 379-387, 2010].

关 键 词：SPIDER Web decorations Cyclosa octotuberculata CAMOUFLAGE Chromatic contrast Achromatic contrast 

分 类 号：Q141[生物学—生态学] TP18[生物学—普通生物学]