Thermal niches are more conserved at cold than warm limits in arctic-alpine plant species

Détails

Ressource 1Télécharger: BIB_1494BCED0317.P001.pdf (869.33 [Ko])
Etat: Serval
Version: Author's accepted manuscript
ID Serval
serval:BIB_1494BCED0317
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Thermal niches are more conserved at cold than warm limits in arctic-alpine plant species
Périodique
Global Ecology and Biogeography
Auteur(s)
Pellissier L., Bråthen K.A., Vittoz P.A., Yoccoz N.G., Dubuis A., Meier A.S., Zimmermann N.E., Randin C.F., Thuiller W., Garraud L., Van Es J., Guisan A.
ISSN
1466-822X
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
22
Numéro
8
Pages
933-941
Langue
anglais
Résumé
Aim Understanding the stability of realised niches is crucial for predicting the responses of species to climate change. One approach is to evaluate the niche differences of populations of the same species that occupy regions that are geographically disconnected. Here, we assess niche conservatism along thermal gradients for 26 plant species with a disjunct distribution between the Alps and the Arctic.
Location European Alps and Norwegian Finnmark.
Methods We collected a comprehensive dataset of 26 arctic-alpine plant occurrences in two regions. We assessed niche conservatism through a multi-species comparison and analysed species rankings at cold and warm thermal limits along two distinct gradients corresponding to (1) air temperatures at 2 meters above ground level and (2) elevation distances to the treeline (TLD) for the two regions. We assessed whether observed relationships were close to those predicted under thermal limit conservatism.
Results We found a weak similarity in species ranking at the warm thermal limits. The range of warm thermal limits for the 26 species was much larger in the Alps than in Finnmark. We found a stronger similarity in species ranking and correspondence at the cold thermal limit along the gradients of 2-m temperature and TLD. Yet, along the 2-m temperature gradient, the cold thermal limits of species in the Alps were lower on average than those in Finnmark.
Main conclusion We found low conservatism of the warm thermal limits but a stronger conservatism of the cold thermal limits. We suggest that biotic interactions at the warm thermal limit likely modulate species responses more strongly than at the cold limit. The differing biotic context between the two regions is likely responsible for the observed differences in realised niches.
Mots-clé
Air-soil temperature, biotic interactions, disjunct distribution, distance to tree line, European Alps, niche conservatism, Norwegian Finnmark, realized niche, species distribution models.
Pubmed
Web of science
Open Access
Oui
Création de la notice
14/12/2012 7:57
Dernière modification de la notice
08/05/2019 14:50
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