Journal
AMERICAN JOURNAL OF BOTANY
Volume 89, Issue 7, Pages 1142-1155Publisher
BOTANICAL SOC AMER INC
DOI: 10.3732/ajb.89.7.1142
Keywords
conservation biology; Marsilea strigosa; micro satellites; multilocus analyses; population structure
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Marsilea strigosa (Marsileaceae, Pterydophyta) is a rare water fern found in the Mediterranean basin, in temporary flooded habitats only. We analyzed the level and the distribution of genetic variation at seven microsatellite loci, both at the Mediterranean scale and at a narrower scale within a highly fragmented French metapopulation. Genetic diversity among individuals within each pond suggests that M. strigosa reproduces predominantly through selfing. The very high population differentiation at the Mediterranean scale indicates that gene flow (if any) is highly restricted, Similar differentiation is also found at the scale of a single metapopulation, The distribution of multilocus genotypes suggests that the genetic variation in this species is maintained mainly through the interplay of mutation and low recombination.
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