Genetic divergence and connectivity among river and reef spawning groups of walleye (Sander vitreus vitreus) in Lake Erie

被引:62
作者
Strange, Rex Meade
Stepien, Carol A.
机构
[1] Univ Toledo, Great Lakes Genet Lab, Lake Erie Ctr, Toledo, OH 43618 USA
[2] Univ Toledo, Dept Environm Sci, Toledo, OH 43618 USA
关键词
D O I
10.1139/F07-022
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Discerning population genetic structure is challenging for highly vagile open water animals, as contemporary gene flow may obscure historic phylogeographic patterns. We examined genetic variation among all 10 major river and reef spawning groups of walleye (Sander vitreus vitreus) in Lake Erie for evidence of isolation by distance, segregation by physiographic partitions, and natal site fidelity using 10 nuclear DNA microsatellite loci. Results revealed that although most spawning groups were distinguishable, relationships did not correspond with physiographic basins or distances among localities. Bayesian analyses showed connectivity among some southern shore spawning groups, which included the largest-sized groups. Significant genetic divergence was discerned among walleye spawning in the river systems of eastern Lake Erie, as well as in two sites in western Lake Erie, along with marked isolation from Lake St. Clair. Population structure of Lake Erie walleye thus appears to reflect the interaction of two different intrinsic factors: isolation due to natal site fidelity that maintains patterns of divergence, and connectivity due to individuals that stray from their natal sites to spawn.
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收藏
页码:437 / 448
页数:12
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