Micro-spatial genetic structure in song sparrows (<Emphasis Type="Italic">Melospiza melodia</Emphasis>) |
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| Authors: | Amy G Wilson Peter Arcese Yvonne L Chan Michael A Patten |
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| Institution: | (1) Center for Applied Conservation Research, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada;(2) Smithsonian Migratory Bird Center, National Zoological Park, P.O. Box 37012-MRC 5503, Washington, DC 20013, USA;(3) Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA;(4) Oklahoma Biological Survey, University of Oklahoma, Norman, OK 73019, USA |
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| Abstract: | The spatial genetic structure of populations is strongly influenced by current and historical patterns of gene flow and drift,
which in the simplest case, is limited by geographic distance. We examined the microspatial genetic structure within 33 populations
of song sparrows (Melospiza melodia) which included eight subspecies located across coastal areas in southern British Columbia (BC) and California. We also examined
the effect of water barriers and local density estimates on genetic structuring. Across both regions, positive genetic structure
was detectable at distances of less than 10 km. Genetic divergence was highest in Californian subspecies, perhaps due to reduced
gene flow across sub-specific contact zones. In BC, populations distributed across islands displayed greater genetic structuring
over similar spatial scales than those across mainland sites, supporting the prediction that water barriers reduce gene flow
in this species. Our results confirm both the expectation for fine-scale genetic structure in these generally sedentary subspecies,
and the role of landscape features in generating geographic variation in genetic structure. |
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