Reference : Trophic specialisations in alternative heterochronic morphs
Scientific journals : Article
Life sciences : Zoology
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
Trophic specialisations in alternative heterochronic morphs
Denoël, Mathieu mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale >]
Schabetsberger, Robert [University of Salzburg, Austria > > > > > > >]
Joly, Pierre [Université Claude Bernard - Lyon 1 - UCLB - France > > > > > > >]
Naturwissenschaften (Die)
Yes (verified by ORBi)
New York
[en] Feeding specialisation ; Diet ; Alpine lake ; Paedomorphosis ; Greece ; France ; Alpine newt ; Amphibian ; Triturus ; Heterochrony ; Triturus alpestris ; Ichthyosaura alpestris ; Resource partitioning ; Pindos ; Drakolimni ; Foraging ; Plankton
[fr] Mesotriton alpestris ; Triton alpestre ; amphibien ; Lac de la Cabane ; Smolikas ; Timphi
[en] Polymorphisms are suspected of reducing competition among conspecifics in heterogeneous environments by allowing differential resource use. However the adaptive significance of alternative morphs has been poorly documented. The aim of this study is to determine food partitioning of two heterochronic morphs of the Alpine newt, Triturus alpestris, in mountain lakes. The morphs differ in the functional morphology of their feeding apparatus. Only paedomorphs are able to expel water during prey suction behind the mouth through gill slits. We observed a substantial trophic differentiation between morphs in all lakes. Paedomorphs preyed mainly on plankton, whereas metamorphs foraged on terrestrial invertebrates that fell upon the water surface. This resource partitioning may facilitate the coexistence of the alternative morphs in lakes devoid of vertebrate competitors. Food diversity may thus favour the evolutionary maintenance of facultative polymorphism in natural populations.
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
Researchers ; Professionals
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