The effectiveness of eyespots and masquerade in protecting artificial prey across ontogenetic and seasonal shifts  

作　　者：Elizabeth G Postema 

机构地区：[1]Department of Entomology and Nematology,University of California,Davis,CA 95616,USA

出　　处：《Current Zoology》2022年第4期451-458,共8页动物学报（英文版）

摘　　要：When constraints on antipredator coloration shift over the course of development,it can be advantageous for animals to adopt different color strategies for each life stage.Many caterpillars in the genus Papilio exhibit unique ontogenetic color sequences:for example,early instars that masquerade as bird feces,with later instars possessing eyespots.I hypothesize that larvae abandon feces masquerade in favor of eyespots due to ontogenetic changes in signaler size.This ontogenetic pattern also occurs within broader seasonal shifts in background color and predator activity.I conducted predation experiments with artificial prey to determine how potential signaling constraints(specifically size and season)shape predation risk,and consequently the expression of ontogenetic color change in Papilio larvae.Seasonally,both predation and background greenness declined significantly from July to September,though there was little evidence that these patterns impacted the effectiveness of either color strategy.Caterpillar size and color strongly affected the attack rate of avian predators:attacks increased with prey size regardless of color,and eyespotted prey were attacked more than masquerading prey overall.These results may reflect a key size-mediated tradeoff between conspicuousness and intimidation in eyespotted prey,and raise questions about how interwoven aspects of behavior and signal environment might maintain the prevalence of large,eyespotted larvae in nature.

关 键 词：ontogenetic color change EYESPOTS MASQUERADE predator-prey dynamics SEASON 

分 类 号：Q95[生物学—动物学]