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Type: Journal article
Title: Fine-scale genetic structure and gene flow within Costa Rican populations of mahogany (Swietenia macrophylla)
Author: Lowe, A.
Jourde, B.
Breyne, P.
Colpaert, N.
Navarro, C.
Wilson, J.
Cavers, S.
Citation: Heredity, 2003; 90(3):268-275
Publisher: Nature Publishing Group
Issue Date: 2003
ISSN: 0018-067X
Statement of
AJ Lowe, B Jourde, P Breyne, N Colpaert, C Navarro, J Wilson and S Cavers
Abstract: Fine-scale structure of genetic diversity and gene flow were analysed in three Costa Rican populations of mahogany, Swietenia macrophylla. Population differentiation estimated using AFLPs and SSRs was low (38.3 and 24%) and only slightly higher than previous estimates for Central American populations based on RAPD variation (20%). Significant fine-scale spatial structure was found in all of the surveyed mahogany populations and is probably strongly influenced by the limited seed dispersal range of the species. Furthermore, a survey of progeny arrays from selected mother trees in two of the plots indicated that most pollinations involved proximate trees. These data indicate that very little gene flow, via either pollen or seed, is occurring between blocks of mahogany within a continuous or disturbed forest landscape. Thus, once diversity is removed from a forest population of mahogany, these data suggest that recovery would be difficult via seed or pollen dispersal, and provides an explanation for mahogany's apparent susceptibility to the pressures of logging. Evidence is reviewed from other studies of gene flow and seedling regeneration to discuss alternative extraction strategies that may maintain diversity or allow recovery of genetic resources.
Keywords: Genetic structure; gene flow; mahogany; microsatellites; Swietenia macrophylla
Description: © 2003 Nature Publishing Group
RMID: 0020071422
DOI: 10.1038/sj.hdy.6800247
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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