期刊
EVOLUTIONARY ECOLOGY
卷 27, 期 4, 页码 755-767出版社
SPRINGER
DOI: 10.1007/s10682-013-9649-8
关键词
Dendrobates pumilio; Warning signal; Crypsis; Population differentiation; Anura; Amphibia
资金
- Swedish Research Council
- Royal Swedish Academy of Sciences
- Stiftelsen for zoologisk forskning
Larger signal size is known to facilitate the learning process of predators to warning signals. Further, smaller objects are generally harder to detect than large, which suggests that smaller sized prey are less likely to benefit from an aposematic strategy compared to crypsis. However, whether body size changes in concert with shifts between crypsis and aposematism in natural populations, remains largely unexplored. I tested whether body size was larger in visually conspicuous population than in cryptic populations among recently diverged populations of the Strawberry Poison frog, Oophaga pumilio. By analysing spectral reflectance and body size data from individuals from 18 discrete populations I found a larger mean body size in conspicuous populations, which was confirmed by an analysis of a subset of 12 populations accounting for phylogenetic history. This shows that the loss of conspicuous colour likely co-evolved repeatedly with a decrease in body size. Thus, selection on body size may influence evolutionary shifts between aposematism and crypsis and vice versa.
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