Dispersal is a major driver of the latitudinal diversity gradient of Carnivora

Détails

ID Serval
serval:BIB_D70A7FE4C139
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Dispersal is a major driver of the latitudinal diversity gradient of Carnivora
Périodique
Global Ecology and Biogeography
Auteur(s)
Rolland J., Condamine F.L., Beeravolu C.R., Jiguet F., Morlon H.
ISSN
1466-8238
ISSN-L
1466-822X
Statut éditorial
Publié
Date de publication
2015
Volume
24
Numéro
9
Pages
1059-1071
Langue
anglais
Résumé
AimUnderstanding the relative contribution of diversification rates (speciation and extinction) and dispersal in the formation of the latitudinal diversity gradient - the decrease in species richness with increasing latitude - is a main goal of biogeography. The mammalian order Carnivora, which comprises 286 species, displays the traditional latitudinal diversity gradient seen in almost all mammalian orders. Yet the processes driving high species richness in the tropics may be fundamentally different in this group from that in other mammalian groups. Indeed, a recent study suggested that in Carnivora, unlike in all other major mammalian orders, net diversification rates are not higher in the tropics than in temperate regions. Our goal was thus to understand the reasons why there are more species of Carnivora in the tropics.
LocationWorld-wide.
MethodsWe reconstructed the biogeographical history of Carnivora using a time-calibrated phylogeny of the clade comprising all terrestrial species and dispersal-extinction-cladogenesis models. We also analysed a fossil dataset of carnivoran genera to examine how the latitudinal distribution of Carnivora varied through time.
ResultsOur biogeographical analyses suggest that Carnivora originated in the East Palaearctic (i.e. Central Asia, China) in the early Palaeogene. Multiple independent lineages dispersed to low latitudes following three main paths: toward Africa, toward India/Southeast Asia and toward South America via the Bering Strait. These dispersal events were probably associated with local extinctions at high latitudes. Fossil data corroborate a high-latitude origin of the group, followed by late dispersal events toward lower latitudes in the Neogene.
Main conclusionsUnlike most other mammalian orders, which originated and diversified at low latitudes and dispersed out of the tropics', Carnivora originated at high latitudes, and subsequently dispersed southward. Our study provides an example of combining phylogenetic and fossil data to understand the generation and maintenance of global-scale geographical variations in species richness.
Mots-clé
Biogeographical history, Carnivora origin, dispersal-extinction-cladogenesis, diversification, out of the tropics, tropical niche conservatism
Création de la notice
08/09/2015 17:35
Dernière modification de la notice
03/03/2018 21:48
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