Article (Scientific journals)
The ‘male escape hypothesis’: sex-biased metamorphosis in response to climatic drivers in a facultatively paedomorphic amphibian
Mathiron, Anthony; Lena, Jean-Paul; Baouch, Sarah et al.
2017In Proceedings of the Royal Society. Biological Sciences, 284 (1853), p. 20170176
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Keywords :
facultative paedomorphosis; metamorphosis; polyphenism; polymorphism; niche shift; habitat transition; drought; drying; water availability; climate change; climate warming; temperature increase; palmate newt; Lissotriton helveticus; triton palmé; amphibien; Larzac; adaptation; biased sex-ratio; sex; experiment; environmental determinism; hydroperiod
Abstract :
[en] Paedomorphosis is a major evolutionary process that bypasses metamorphosis and allows reproduction in larvae. In newts and salamanders, it can be facultative with paedomorphs retaining gills and metamorphs dispersing. The evolution of these developmental processes is thought to have been driven by the costs and benefits of inhabiting aquatic versus terrestrial habitats. In this context, we aimed at testing the hypothesis that climatic drivers affect phenotypic transition and the difference across sexes because sex-ratio is biased in natural populations. Through a replicated laboratory experiment, we showed that paedomorphic palmate newts (Lissotriton helveticus) metamorphosed at a higher frequency when water availability decreased and metamorphosed earlier when temperature increased in these conditions. All responses were sex-biased, and males were more prone to change phenotype than females. Our work shows how climatic variables can affect facultative paedomorphosis and support theoretical models predicting life on land instead of in water. Moreover, because males metamorphose and leave water more often and earlier than females, these results, for the first time, give an experimental explanation for the rarity of male paedomorphosis (the ‘male escape hypothesis’) and suggest the importance of sex in the evolution of paedomorphosis versus metamorphosis.
Research Center/Unit :
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Aquatic sciences & oceanology
Zoology
Environmental sciences & ecology
Author, co-author :
Mathiron, Anthony;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Unité de biologie du Comportement
Lena, Jean-Paul;  Université Claude Bernard - Lyon 1 - UCLB > Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés
Baouch, Sarah;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Unité de Biologie du Comportement
Denoël, Mathieu  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale
Language :
English
Title :
The ‘male escape hypothesis’: sex-biased metamorphosis in response to climatic drivers in a facultatively paedomorphic amphibian
Publication date :
April 2017
Journal title :
Proceedings of the Royal Society. Biological Sciences
ISSN :
0962-8452
eISSN :
1471-2954
Publisher :
Royal Society, London, United Kingdom
Volume :
284
Issue :
1853
Pages :
20170176
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
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since 19 April 2017

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