How ancient forest fragmentation and riparian connectivity generate high levels of genetic diversity in a microendemic Malagasy tree.
Madagascar
Malagasy olive
RADseq
connectivity
cpSSR
gene flow
habitat loss and fragmentation
habitat mosaic
landscape genetics
mitochondrial DNA
Journal
Molecular ecology
ISSN: 1365-294X
Titre abrégé: Mol Ecol
Pays: England
ID NLM: 9214478
Informations de publication
Date de publication:
01 2023
01 2023
Historique:
revised:
13
10
2022
received:
20
11
2021
accepted:
17
10
2022
pubmed:
3
11
2022
medline:
11
1
2023
entrez:
2
11
2022
Statut:
ppublish
Résumé
Understanding landscape changes is central to predicting evolutionary trajectories and defining conservation practices. While human-driven deforestation is intense throughout Madagascar, exceptions in areas such as the Loky-Manambato region (north) raise questions regarding the causes and age of forest fragmentation. The Loky-Manambato region also harbours a rich and endemic flora, whose evolutionary origin remains poorly understood. We assessed the genetic diversity of an endangered microendemic Malagasy olive species (Noronhia spinifolia Hong-Wa) to better understand the vegetation dynamics in the Loky-Manambato region and its influence on past evolutionary processes. We characterized 72 individuals sampled across eight forests through nuclear and mitochondrial restriction-associated DNA sequencing data and chloroplast microsatellites. Combined population and landscape genetics analyses indicate that N. spinifolia diversity is largely explained by the current forest cover, highlighting a long-standing habitat mosaic in the region. This sustains a major and long-term role of riparian corridors in maintaining connectivity across these antique mosaic habitats, calling for the study of organismal interactions that promote gene flow.
Identifiants
pubmed: 36320175
doi: 10.1111/mec.16759
pmc: PMC10100191
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
299-315Informations de copyright
© 2022 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.
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