ORBi: Denoël Mathieu - How do paedomorphic newts cope with lake drying?

Reference : How do paedomorphic newts cope with lake drying?


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Aquatic sciences & oceanology Life sciences : Environmental sciences & ecology Life sciences : Zoology Social & behavioral sciences, psychology : Animal psychology, ethology & psychobiology
	To cite this reference:	http://hdl.handle.net/2268/2977

Title :	How do paedomorphic newts cope with lake drying?
Language :	English
Author, co-author :	Denoël, Mathieu [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
Publication date :	2003
Journal title :	Ecography
Publisher :	Blackwell Munksgaard
Volume :	26
Issue/season :	4
Pages :	405-410
Audience :	International
ISSN :	0906-7590
City :	Copenhagen
Keywords :	[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
Abstract :	[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.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/2977
DOI :	10.1034/j.1600-0587.2003.03366.x
Mentions required by the publisher for OA :	The definitive published version is available at www.blackwell-synergy.com

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