Population genetic diversity and structure within and among disjunct populations of <Emphasis Type="Italic">Alnus maritima</Emphasis> (seaside alder) using microsatellites |
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Authors: | James M Jones J Phil Gibson |
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Institution: | (1) Department of Botany-Microbiology, University of Oklahoma, 770 Van Vleet Oval, Norman, OK 73019, USA;(2) Department of Zoology, University of Oklahoma, 730 Van Vleet Oval, Norman, OK, USA; |
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Abstract: | Small, isolated populations are prone to genetic drift and high levels of inbreeding that can threaten their long-term survival.
Alnus maritima persists exclusively in three groups of small, highly disjunct, regional populations in the Delmarva Peninsula, Georgia,
and Oklahoma. Trees in the three regions are recognized as separate subspecies. Microsatellite markers were used to measure
fine-scale population genetic diversity and structure (1) within and among regions and (2) within and among populations in
each region. Compared to a previous study utilizing allozymes, microsatellite data show higher levels of variation, lower
levels of inbreeding, but similar levels of genetic differentiation among regions. Significant genetic differentiation was
detected among regions and among distinct populations within regions. Genetic differentiation was significantly correlated
with geographic distance among regional populations, but not among populations within regions. Populations, therefore, likely
represent fragments of formerly extensive networks of populations that have decayed and retracted due to competition with
other species better adapted to the shadier habitats of late-succession environments. The unique genetic features of populations
within different regions should be considered as part of future conservation efforts. |
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