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Geographic variation in a predator-induced defense and its genetic basis

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Title: Geographic variation in a predator-induced defense and its genetic basis
Authors: Kishida, Osamu Browse this author
Trussell, Geoffrey C. Browse this author
Nishimura, Kinya Browse this author
Keywords: arms race
bulgy
coevolution
costs
genetic variation
inducible defense
inducible offense
local adaptation
phenotypic plasticity
predation risk
salamander
tadpole
Issue Date: Aug-2007
Publisher: Ecological Society of America
Journal Title: Ecology
Volume: 88
Issue: 8
Start Page: 1948
End Page: 1954
Publisher DOI: 10.1890/07-0132.1
PMID: 17824425
Abstract: Predator-induced morphological defenses are a well-known form of phenotypic plasticity, but we continue to have a limited understanding of geographic variation in these responses and its genetic basis. Here we examine genetic variation and geographic differentiation in the inducible defenses of tadpoles (Rana pirica) in response to predatory salamander larvae (Hynobius retardatus). To do so, we crossed male and female frogs from a “mainland” Japanese island having predaceous salamanders and a more isolated island not having predaceous salamanders and raised resulting offspring in the presence and absence of H. retardatus. Mainland tadpoles exhibited a higher capacity to express the inducible morphology (a more bulgy body) than those from the predator-free island, and expression of the bulgy morph in mainland–island hybrids produced phenotypes that were intermediate to those produced by pure crosses. In addition, parental sex had no effect on expression of the bulgy morph. Our results support the hypothesis that geographic variation in inducible defenses is linked to the additive effects of autosomal alleles that are shaped by differences in historical exposure to the inducing predator.
Type: article
URI: http://hdl.handle.net/2115/30177
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 西村 欣也

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