Reference : Reproductive fitness consequences of progenesis: sex-specific payoffs in safe and ris...
Scientific journals : Article
Life sciences : Zoology
Life sciences : Aquatic sciences & oceanology
Life sciences : Environmental sciences & ecology
Social & behavioral sciences, psychology : Animal psychology, ethology & psychobiology
Reproductive fitness consequences of progenesis: sex-specific payoffs in safe and risky environments
Denoël, Mathieu mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Écologie et de Conservation des Amphibiens >]
Drapeau, Laura [Université de Liège - ULiège > > Laboratoire d'Ecologie et de Conservation des Amphibiens > >]
Winandy, Laurane mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Écologie et de Conservation des Amphibiens >]
Journal of Evolutionary Biology
Yes (verified by ORBi)
United Kingdom
[en] amphibians ; facultative paedomorphosis ; fitness ; heterochrony ; metamorphosis ; newt ; predation ; progenesis ; reproduction ; sex ratio ; behaviour ; behavior ; fecundity ; egg laying ; size ; sex ratio ; sexual dimorphism ; maturation ; courtship ; Lissotriton helveticus ; palmate newt ; cost ; benefit ; sex biases ; small size ; sexual selection ; Larzac
[en] Progenesis is considered to have an important role in evolution because it allows the retention of both a larval body size and shape in an adult morphology. However, the cost caused by the adoption of a progenetic process in both males and females remains to be explored to explain the success of progenesis and particularly its biased prevalence across the sexes and environments. Here, through an experimental approach, we used a facultative progenetic species, the palmate newt (Lissotriton helveticus) that can either mature at a small size and retain gills or mature after metamorphosis, to test three hypotheses for sex-specific payoffs of progenesis in safe versus risky habitats. Goldfish were used because they caused a higher decline in progenetic than metamorphic newts. We determined that progenetic newts have a lower reproductive fitness than metamorphic newts. We also found that, when compared to metamorphs, progenetic males have lower reproductive activity than progenetic females and that predatory risk affects more progenetic than metamorphic newts. By identifying ultimate causes of the female-biased sex ratios found in nature, these results support the male escape hypothesis, i.e. the higher metamorphosis rate of progenetic males. They also highlight that although progenesis is advantageous in advancing the age at first reproduction, it also brings an immediate fitness cost and this, particularly, in hostile predatory environments. This means that whereas some environmental constraints could favour facultative progenesis, some others, such as predation, can ultimately counter-select progenesis. Altogether, these results improve our understanding of how developmental processes can affect the sexes differently and how species invasions can impair the success of alternative developmental phenotypes.
Freshwater and OCeanic science Unit of reSearch - FOCUS
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Researchers ; Professionals ; Students
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