Hybridization as a threat in climate relict Nuphar pumila (Nymphaeaceae)

Détails

ID Serval
serval:BIB_8BA0E24D91FE
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Hybridization as a threat in climate relict Nuphar pumila (Nymphaeaceae)
Périodique
Biodiversity and Conservation
Auteur(s)
Arrigo N., Bétrisey S., Graf L., Bilat J., Gerber E., Kozlowski G.
ISSN
1572-9710
ISSN-L
0960-3115
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
25
Numéro
10
Pages
1863-1877
Langue
anglais
Résumé
Field studies and conceptual work on hybridization-mediated extinction risk in climate relicts are extremely rare. Nuphar pumila (Nymphaeaceae) is one of the most emblematic climate relicts in Europe with few isolated populations in the Alpine arc. The extent of introgression with related lowland and generalist species Nuphar lutea has never been studied using molecular methods. All biogeographical regions where N. pumila naturally occurs in the neighbourhood of the Alpine arc were sampled and studied using nuclear microsatellite markers. Furthermore, we used forward-in-time simulations and Approximate Bayesian Computation to check whether an introgression scenario fits with the observed admixture patterns and estimated the demographic parameters associated with this process. Our study confirms ongoing hybridization between N. pumila and N. lutea and validates it by the use of population models. More than 40 % of investigated N. pumila individuals were admixed and hybrids were found in over 60 % of studied populations. The introgression is bidirectional and is most likely a result of very recent gene flow. Our work provides strong evidence for rapid extinction risk and demographic swamping between specialized climatic relicts and closely related generalists. The remaining pure populations of N. pumila are rare in the Alpine arc and deserve high conservation priority.
Mots-clé
Boreal geoelement, Hybridization-mediated extinction, Introgression, Nuphar lutea, Nuphar pumila, Refugia
Web of science
Création de la notice
07/06/2016 8:44
Dernière modification de la notice
20/08/2019 14:50
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