Life-History Traits Evolved Jointly with Climatic Niche and Disturbance Regime in the Genus Leucadendron (Proteaceae).

Détails

ID Serval
serval:BIB_A64AB4277811
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Life-History Traits Evolved Jointly with Climatic Niche and Disturbance Regime in the Genus Leucadendron (Proteaceae).
Périodique
The American Naturalist
Auteur(s)
Tonnabel J., Schurr F.M., Boucher F., Thuiller W., Renaud J., Douzery EJP, Ronce O.
ISSN
1537-5323 (Electronic)
ISSN-L
0003-0147
Statut éditorial
Publié
Date de publication
2018
Peer-reviewed
Oui
Volume
191
Numéro
2
Pages
220-234
Langue
anglais
Résumé
Organisms have evolved a diversity of life-history strategies to cope with variation in their environment. Persistence as adults and/or seeds across recruitment events allows species to dampen the effects of environmental fluctuations. The evolution of life cycles with overlapping generations should thus permit the colonization of environments with uncertain recruitment. We tested this hypothesis in Leucadendron (Proteaceae), a genus with high functional diversity native to fire-prone habitats in the South African fynbos. We analyzed the joint evolution of life-history traits (adult survival and seed-bank strategies) and ecological niches (climate and fire regime), using comparative methods and accounting for various sources of uncertainty. In the fynbos, species with canopy seed banks that are unable to survive fire as adults display nonoverlapping generations. In contrast, resprouters with an underground seed bank may be less threatened by extreme climatic events and fire intervals, given their iteroparity and long-lasting seed bank. Life cycles with nonoverlapping generations indeed jointly evolved with niches with less exposure to frost but not with those with less exposure to drought. Canopy seed banks jointly evolved with niches with more predictable fire return, compared to underground seed banks. The evolution of extraordinary functional diversity among fynbos plants thus reflects, at least in part, the diversity of both climates and fire regimes in this region.
Mots-clé
Ecology, Evolution, Behavior and Systematics, bet hedging, comparative analyses, fire, functional traits, niche evolution, seed bank
Pubmed
Web of science
Création de la notice
10/04/2018 21:33
Dernière modification de la notice
20/08/2019 16:11
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