Genetic structure at range edge: low diversity and high inbreeding in Southeast Asian mangrove (Avicennia marina) populations.

Détails

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Accès restreint UNIL
Etat: Public
Version: Final published version
Licence: Non spécifiée
ID Serval
serval:BIB_9E31FCDCFBC5
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Genetic structure at range edge: low diversity and high inbreeding in Southeast Asian mangrove (Avicennia marina) populations.
Périodique
Molecular ecology
Auteur⸱e⸱s
Arnaud-Haond S., Teixeira S., Massa S.I., Billot C., Saenger P., Coupland G., Duarte C.M., Serrão E.A.
ISSN
0962-1083 (Print)
ISSN-L
0962-1083
Statut éditorial
Publié
Date de publication
10/2006
Peer-reviewed
Oui
Volume
15
Numéro
12
Pages
3515-3525
Langue
anglais
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Understanding the genetic composition and mating systems of edge populations provides important insights into the environmental and demographic factors shaping species' distribution ranges. We analysed samples of the mangrove Avicennia marina from Vietnam, northern Philippines and Australia, with microsatellite markers. We compared genetic diversity and structure in edge (Southeast Asia, and Southern Australia) and core (North and Eastern Australia) populations, and also compared our results with previously published data from core and southern edge populations. Comparisons highlighted significantly reduced gene diversity and higher genetic structure in both margins compared to core populations, which can be attributed to very low effective population size, pollinator scarcity and high environmental pressure at distribution margins. The estimated level of inbreeding was significantly higher in northeastern populations compared to core and southern populations. This suggests that despite the high genetic load usually associated with inbreeding, inbreeding or even selfing may be advantageous in margin habitats due to the possible advantages of reproductive assurance, or local adaptation. The very high level of genetic structure and inbreeding show that populations of A. marina are functioning as independent evolutionary units more than as components of a metapopulation system connected by gene flow. The combinations of those characteristics make these peripheral populations likely to develop local adaptations and therefore to be of particular interest for conservation strategies as well as for adaptation to possible future environmental changes.
Mots-clé
Australia, Avicennia/genetics, Avicennia/physiology, Biodiversity, Gene Flow, Genetic Variation, Geography, Inbreeding, Linkage Disequilibrium, Microsatellite Repeats, Philippines, Vietnam
Pubmed
Web of science
Création de la notice
19/11/2007 10:42
Dernière modification de la notice
24/07/2023 15:25
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