Reference : Resource partitioning in two heterochronic populations of Greek Alpine newts, Trituru...
Scientific journals : Article
Life sciences : Zoology
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
Resource partitioning in two heterochronic populations of Greek Alpine newts, Triturus alpestris veluchiensis
Denoël, Mathieu mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
Schabetsberger, R. [Universität Salzburg > > > >]
Acta Oecologica: International Journal of Ecology
Editions Elsevier
Yes (verified by ORBi)
[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 ; Micro-habitat
[fr] Amphibien ; Triton alpestre ; Pédomorphose
[en] Ichthyosaura alpestris veluchiensis ; Mesotriton alpestris veluchiensis ; Triturus alpestris veluchiensis ; Daphnia ; Chaoburus ; Space use ; Vertical movement ; Predatory tactics ; Predation
[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.
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
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