Disparity in the timing of vertebrate diversification events between the northern and southern hemispheres.

Détails

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_2611C6830F07
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Disparity in the timing of vertebrate diversification events between the northern and southern hemispheres.
Périodique
BMC Evolutionary Biology
Auteur(s)
Tingley R., Dubey S.
ISSN
1471-2148 (Electronic)
ISSN-L
1471-2148
Statut éditorial
Publié
Date de publication
2012
Volume
12
Pages
244
Langue
anglais
Résumé
ABSTRACT:
BACKGROUND: Climatic oscillations throughout the Quaternary had profound effects on temperate biodiversity, but the extent of Quaternary climate change was more severe in temperate regions of the northern hemisphere than in the southern hemisphere. We sought to determine whether this geographic disparity differentially influenced the timing of intraspecific diversification events within ectothermic and endothermic vertebrate species. Using published phylogenetic hypotheses, we gathered data on the oldest intraspecific diversification event within mammal, bird, freshwater fish, amphibian, and reptile species from temperate-zone areas. We then tested whether the timing of diversification events differed between hemispheres.
RESULTS: Our analyses provide strong evidence that vertebrates from temperate regions of the northern hemisphere are younger than those from the southern hemisphere. However, we find little evidence to suggest that this relationship differs between endotherms versus ectotherms, or that it varies widely across the five classes of vertebrates that we considered. In addition, we find that on average, endothermic species are much younger than ectothermic species.
CONCLUSION: Our findings suggest that geographic variation in the magnitude of climatic oscillations during the Quaternary led to substantial disparity in the timing of intraspecific diversification events between northern and southern hemisphere vertebrates, and that the magnitude of this divergence is largely congruent across vertebrate taxa.
Mots-clé
Climate change, Dispersal, Ectotherm, Endotherm, Genetic diversity, Glaciation, Intraspecific diversification, Quaternary
Pubmed
Web of science
Open Access
Oui
Création de la notice
14/04/2012 17:18
Dernière modification de la notice
20/08/2019 13:04
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