Article (Scientific journals)
Reproductive fitness consequences of progenesis: sex-specific payoffs in safe and risky environments
Denoël, Mathieu; Drapeau, Laura; Winandy, Laurane
2019In Journal of Evolutionary Biology, 32 (6), p. 629-637
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Keywords :
amphibians; facultative paedomorphosis; fitness; heterochrony; metamorphosis; newt; predation; progenesis; reproduction; sex ratio; behaviour; behavior; fecundity; egg laying; size; sexual dimorphism; maturation; courtship; Lissotriton helveticus; palmate newt; cost; benefit; sex biases; small size; sexual selection; Larzac
Abstract :
[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.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Zoology
Animal psychology, ethology & psychobiology
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Denoël, Mathieu  ;  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 ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Écologie et de Conservation des Amphibiens
Language :
English
Title :
Reproductive fitness consequences of progenesis: sex-specific payoffs in safe and risky environments
Publication date :
June 2019
Journal title :
Journal of Evolutionary Biology
ISSN :
1010-061X
eISSN :
1420-9101
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
32
Issue :
6
Pages :
629-637
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 23 March 2019

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