A tale of two forests: ongoing aridification drives population decline and genetic diversity loss at continental scale in Afro-Macaronesian evergreen-forest archipelago endemics.

Détails

ID Serval
serval:BIB_D6A12EF2ABE0
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A tale of two forests: ongoing aridification drives population decline and genetic diversity loss at continental scale in Afro-Macaronesian evergreen-forest archipelago endemics.
Périodique
Annals of botany
Auteur(s)
Mairal M., Caujapé-Castells J., Pellissier L., Jaén-Molina R., Álvarez N., Heuertz M., Sanmartín I.
ISSN
1095-8290 (Electronic)
ISSN-L
0305-7364
Statut éditorial
Publié
Date de publication
30/11/2018
Peer-reviewed
Oui
Volume
122
Numéro
6
Pages
1005-1017
Langue
anglais
Résumé
Various studies and conservationist reports have warned about the contraction of the last subtropical Afro-Macaronesian forests. These relict vegetation zones have been restricted to a few oceanic and continental islands around the edges of Africa, due to aridification. Previous studies on relict species have generally focused on glacial effects on narrow endemics; however, little is known about the effects of aridification on the fates of previously widespread subtropical lineages.
Nuclear microsatellites and ecological niche modelling were used to understand observed patterns of genetic diversity in two emblematic species, widely distributed in these ecosystems: Canarina eminii (a palaeoendemic of the eastern Afromontane forests) and Canarina canariensis (a palaeoendemic of the Canarian laurel forests). The software DIYABC was used to test alternative demographic scenarios and an ensemble method was employed to model potential distributions of the selected plants from the end of the deglaciation to the present.
All the populations assessed experienced a strong and recent population decline, revealing that locally widespread endemisms may also be alarmingly threatened.
The detected extinction debt, as well as the extinction spiral to which these populations are subjected, demands urgent conservation measures for the unique, biodiversity-rich ecosystems that they inhabit.
Mots-clé
Islands, nuclear microsatellites, subtropical flora, decline, aridification, extinction, genetic conservation
Pubmed
Web of science
Création de la notice
23/07/2018 17:40
Dernière modification de la notice
14/05/2019 6:11
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