Influence of climate on the presence of colour polymorphism in two montane reptile species.

Détails

ID Serval
serval:BIB_0F12271CB2F7
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Influence of climate on the presence of colour polymorphism in two montane reptile species.
Périodique
Biology Letters
Auteur(s)
Broennimann O., Ursenbacher S., Meyer A., Golay P., Monney J.C., Schmocker H., Guisan A., Dubey S.
ISSN
1744-957X (Electronic)
ISSN-L
1744-9561
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
10
Numéro
11
Pages
20140638
Langue
anglais
Résumé
The coloration of ectotherms plays an important role in thermoregulation processes. Dark individuals should heat up faster and be able to reach a higher body temperature than light individuals and should therefore have benefits in cool areas. In central Europe, montane local populations of adder (Vipera berus) and asp viper (Vipera aspis) exhibit a varying proportion of melanistic individuals. We tested whether the presence of melanistic V. aspis and V. berus could be explained by climatic conditions. We measured the climatic niche position and breadth of monomorphic (including strictly patterned individuals) and polymorphic local populations, calculated their niche overlap and tested for niche equivalency and similarity. In accordance with expectations, niche overlap between polymorphic local populations of both species is high, and even higher than that of polymorphic versus monomorphic montane local populations of V. aspis, suggesting a predominant role of melanism in determining the niche of ectothermic vertebrates. However, unexpectedly, the niche of polymorphic local populations of both species is narrower than that of monomorphic ones, indicating that colour polymorphism does not always enable the exploitation of a greater variability of resources, at least at the intraspecific level. Overall, our results suggest that melanism might be present only when the thermoregulatory benefit is higher than the cost of predation.
Mots-clé
reptile, melanism, thermoregulation, niche
Pubmed
Web of science
Création de la notice
15/10/2014 18:10
Dernière modification de la notice
20/08/2019 12:35
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