Reference : How do paedomorphic newts cope with lake drying?
Scientific journals : Article
Social & behavioral sciences, psychology : Animal psychology, ethology & psychobiology
Life sciences : Zoology
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
How do paedomorphic newts cope with lake drying?
Denoël, Mathieu mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
Blackwell Munksgaard
Yes (verified by ORBi)
[en] Paedomorphosis ; Heterochrony ; Polyphenism ; Metamorphosis ; Movement ; Habitat ; Drying ; Alpine lake ; Amphibian ; Land use ; Polymorphism ; Mesocosm ; Density ; Water level ; Hydroperiod ; Amphibian ; Alpine newt ; Proximate causes
[fr] Mesotriton alpestris ; Triturus alpestris ; Ichthyosaura alpestris ; Amphibien ; Triton alpestre ; Lac de la cabane
[en] Experiment ; Drought ; Alps
[en] Paedomorphosis, in which adult individuals retain larval traits, is widespread in newts and salamanders. Most evolutionary models predict the maintenance of this life-history trait in favourable aquatic habitats surrounded by hostile terrestrial environments. Nevertheless, numerous ponds inhabited by paedomorphic individuals are unpredictable and temporary. In an experimental framework, I showed that paedomorphic newts were able to metamorphose and thus survive in the absence of water. However, the mere decrease of water level or the life space do not seem to induce metamorphosis in paedomorphs. On the contrary, drying up induces almost all individuals to move on land and after that to colonize other aquatic sites located nearby. Such terrestrial migrations allow survival in drying conditions without metamorphosis as long as the distances of terrestrial migration are short. These results are consistent with the presence of paedomorphs in drying ponds and are in favor of classic optimality models predicting metamorphosis in unfavorable environments.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals
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