Does spatial variation in predation pressure modulate selection for aposematism?

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	Does spatial variation in predation pressure modulate selection for aposematism?
	Aluthwattha, S. Tharanga; Harrison, Rhett D.; Ranawana, Kithsiri B.; Xu, Cheng; Lai, Ren; Chen, Jin
刊名	ECOLOGY AND EVOLUTION
	2017
卷号	7 期号:18 页码:7560-7572
关键词	Conspicuousness Danainae Fitness Mimicry Toxicity Warning Signals
英文摘要	It is widely believed that aposematic signals should be conspicuous, but in nature, they vary from highly conspicuous to near cryptic. Current theory, including the honest signal or trade-off hypotheses of the toxicity-conspicuousness relationship, cannot explain why adequately toxic species vary substantially in their conspicuousness. Through a study of similarly toxic Danainae (Nymphalidae) butterflies and their mimics that vary remarkably in their conspicuousness, we show that the benefits of conspicuousness vary along a gradient of predation pressure. Highly conspicuous butterflies experienced lower avian attack rates when background predation pressure was low, but attack rates increased rapidly as background predation pressure increased. Conversely, the least conspicuous butterflies experienced higher attack rates at low predation pressures, but at high predation pressures, they appeared to benefit from crypsis. Attack rates of intermediately conspicuous butterflies remained moderate and constant along the predation pressure gradient. Mimics had a similar pattern but higher attack rates than their models and mimics tended to imitate the signal of less attacked model species along the predation pressure gradient. Predation pressure modulated signal fitness provides a possible mechanism for the maintenance of variation in conspicuousness of aposematic signals, as well as the initial survival of conspicuous signals in cryptic populations in the process of aposematic signal evolution, and an alternative explanation for the evolutionary gain and loss of mimicry.
URL标识	查看原文
语种	英语
公开日期	2018-02-09
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/10742]
专题	西双版纳热带植物园_动植物关系组
通讯作者	Chen, Jin
推荐引用方式 GB/T 7714	Aluthwattha, S. Tharanga,Harrison, Rhett D.,Ranawana, Kithsiri B.,et al. Does spatial variation in predation pressure modulate selection for aposematism?[J]. ECOLOGY AND EVOLUTION,2017,7(18):7560-7572.
APA	Aluthwattha, S. Tharanga,Harrison, Rhett D.,Ranawana, Kithsiri B.,Xu, Cheng,Lai, Ren,&Chen, Jin.(2017).Does spatial variation in predation pressure modulate selection for aposematism?.ECOLOGY AND EVOLUTION,7(18),7560-7572.
MLA	Aluthwattha, S. Tharanga,et al."Does spatial variation in predation pressure modulate selection for aposematism?".ECOLOGY AND EVOLUTION 7.18(2017):7560-7572.