The role of climatic tolerances and seed traits in reduced extinction rates of temperate polygonaceae.

Détails

ID Serval
serval:BIB_847BD92FD651
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The role of climatic tolerances and seed traits in reduced extinction rates of temperate polygonaceae.
Périodique
Evolution
Auteur(s)
Kostikova A., Salamin N., Pearman P.B.
ISSN
1558-5646 (Electronic)
ISSN-L
0014-3820
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
68
Numéro
7
Pages
1856-1870
Langue
anglais
Résumé
The latitudinal diversity gradient (LDG) is one of the most striking and consistent biodiversity patterns across taxonomic groups. We investigate the species richness gradient in the buckwheat family, Polygonaceae, which exhibits a reverse LDG and is, thus, decoupled from dominant gradients of energy and environmental stability that increase toward the tropics and confound mechanistic interpretations. We test competing age and evolutionary diversification hypotheses, which may explain the diversification of this plant family over the past 70 million years. Our analyses show that the age hypothesis, which posits that clade richness is positively correlated with the ecological and evolutionary time since clade origin, fails to explain the richness gradient observed in Polygonaceae. However, an evolutionary diversification hypothesis is highly supported, with diversification rates being 3.5 times higher in temperate clades compared to tropical clades. We demonstrate that differences in rates of speciation, migration, and molecular evolution insufficiently explain the observed patterns of differential diversification rates. We suggest that reduced extinction rates in temperate clades may be associated with adaptive responses to selection, through which seed morphology and climatic tolerances potentially act to minimize risk in temporally variable environments. Further study is needed to understand causal pathways among these traits and factors correlated with latitude.
Mots-clé
Adaptation, climate tolerance, dispersal, distribution model, diversification, dormancy, extinction, latitudinal richness gradient, molecular rates, niche, Polygonaceae, seed
Pubmed
Web of science
Création de la notice
10/02/2015 12:29
Dernière modification de la notice
03/03/2018 18:55
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