ORBi: Denoël Mathieu - Resource partitioning in two heterochronic populations of Greek Alpine newts, Triturus alpestris veluchiensis

Reference : Resource partitioning in two heterochronic populations of Greek Alpine newts, Triturus a...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Zoology Life sciences : Environmental sciences & ecology Life sciences : Aquatic sciences & oceanology
	To cite this reference:	http://hdl.handle.net/2268/3029

Title :	Resource partitioning in two heterochronic populations of Greek Alpine newts, Triturus alpestris veluchiensis
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 >]
	Schabetsberger, R. [Universität Salzburg > > > >]
Publication date :	2003
Journal title :	Acta Oecologica: International Journal of Ecology
Publisher :	Editions Elsevier
Volume :	24
Issue/season :	1
Pages :	55-64
Audience :	International
ISSN :	1146-609X
City :	Paris
Country :	France
Keywords :	[en] Resource partitioning ; Diet ; Habitat ; Predator-prey relationships ; Heterochrony ; Paedomorphosis ; Polymorphism ; Alpine newt ; Amphibian ; Pindos ; Greece ; Drakolimni ; Smolikas ; Timphi ; Plankton ; Foraging ; Trapping ; Minnow traps ; CMR ; Population size
	[fr] Amphibien ; Triton alpestre ; Pédomorphose
Abstract :	[en] Current ecological models suggest that the maintenance of trophic polymorphisms is favoured by a different resource use in alternative morphs. Facultative paedomorphosis in newts is an example of phenotypic variation as paedomorphs retain morphological larval traits, such as gills and gill slits. The aim of this study was to find out whether heterochronic morphs occupy particular micro-habitats and focus on specific prey items. Resource partitioning was found between morphs. It concerns mainly food selection with paedomorphs preying more on plankton and less on terrestrial invertebrates than metamorphs. Some habitat specializations were also found with metamorphs being more abundant at the water surface than paedomorphs. Diel variation in habitat use of the two different morphs was minimal. Polymorphism allows Alpine newts to exploit the different resources in the lakes in order to minimize intraspecific competition, but the extent of resource partitioning depends on habitat characteristics. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
Funders :	Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/3029
DOI :	10.1016/S1146-609X(03)00043-2
Mentions required by the publisher for OA :	This paper is also available on Elsevier website

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