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A trade-off between prey- and predator-induced polyphenisms in larvae of the salamander Hynobius retardatus

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Title: A trade-off between prey- and predator-induced polyphenisms in larvae of the salamander Hynobius retardatus
Authors: Michimae, Hirofumi Browse this author →KAKEN DB
Hangui, Jun-Ichi Browse this author
Keywords: Broad-headed morph
Phenotypic plasticity
Issue Date: Mar-2008
Publisher: Springer Berlin / Heidelberg
Journal Title: Behavioral Ecology and Sociobiology
Volume: 62
Issue: 5
Start Page: 699
End Page: 704
Publisher DOI: 10.1007/s00265-007-0494-z
Abstract: Organisms in natural habitats participate in complex ecological interactions that include competition, predation, and foraging. Under natural aquatic environmental conditions, amphibian larvae can simultaneously receive multiple signals from conspecifics, predators, and prey, implying that predator-induced morphological defenses can occur in prey and that prey-induced offensive morphological traits may develop in predators. Although multiple adaptive plasticity, such as inducible defenses and inducible offensive traits, can be expected to have not only ecological but also evolutionary implications, few empirical studies report on species having such plasticity. The broad-headed larval morph of Hynobius retardatus, which is induced by crowding with heterospecific anuran (Rana pirica) larvae, is a representative example of prey-induced polyphenism. The morph is one of two distinct morphs that have been identified in this species; the other is the typical morph. In this paper, we report that typical larval morphs of Hynobius can respond rapidly to a predatory environment and show conspicuous predator-induced plasticity of larval tail depth, but that broad-headed morphs cannot respond similarly to a predation threat. Our findings support the hypothesis that induction or maintenance of adaptive plasticity (e.g., predator-induced polyphenism) trades off against other adaptive plastic responses (e.g., prey-induced polyphenism). For a species to retain both an ability to forage for larger prey and an ability to more effectively resist predation makes sense in light of the range of environments that many salamander larvae experience in nature. Our results suggest that the salamander larvae clearly discriminate between cues from prey and those from predators and accurately respond to each cue; that is, they adjust their phenotype to the current environment.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 道前 洋史

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