Abstract:
:Habitat fragmentation represents the single most serious threat to the survival of tropical ecosystems. In formulating strategies to counteract the detrimental effects of fragmentation, knowledge of the levels and patterns of genetic diversity within and between natural populations is vital to the establishment of any conservation programme. We utilized polymorphic chloroplast microsatellite markers to analyse genetic diversity in populations of the endangered tropical tree Caesalpinia echinata Lam. representing the entire extant range of the species. Levels of within-population diversity were low, with only two of seven populations studied displaying any variation. The vast majority of the genetic variation was partitioned between geographical regions (36%) and between populations within regions (55%). These levels of genetic structuring, coupled with a calculated pollen-to-seed flow ratio of approximately 6.7:1, suggest that there has been little gene flow between the three major geographical regions over an extended period. Thus, the current tripartite distribution of the species is more consistent with the existence of separate glacial refugia, rather than reflecting any anthropogenic effects.
journal_name
Mol Ecoljournal_title
Molecular ecologyauthors
Lira CF,Cardoso SR,Ferreira PC,Cardoso MA,Provan Jdoi
10.1046/j.1365-294x.2003.01991.xsubject
Has Abstractpub_date
2003-12-01 00:00:00pages
3219-25issue
12eissn
0962-1083issn
1365-294Xpii
1991journal_volume
12pub_type
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