132-1 The Influence of Dams on Connectivity of Bull Trout in the Yakima Basin

Maureen P. Small , Washington Department of Fish and Wildlife, Olympia, WA
Yuki Reiss , Yakima Basin Fish and Wildlife Recovery Board, Yakima, WA
Jennifer Von Bargen , Conservation, Washington Department of Fish and Wildlife, Olympia, WA
Denise Hawkins , Conservation, Washington Department of Fish and Wildlife, Olympia, WA
Eric Anderson , Conservation, Washington Department of Fish and Wildlife, Olympia, WA
Bull trout samples collected from throughout the Yakima Basin were genotyped at 16 standardized microsatellite loci.  Genetic analysis identified 12 distinct bull trout populations.  Pairwise FST tests and tests of genotypic differentiation indicated highly significant differences among collections.  Asymmetric geneflow from the Tieton basin populations into Rattlesnake Cr. suggested that fish entrained over Tieton Dam migrate to the nearest tributary (Rattlesnake Cr.) to spawn.  Genetic data were used to identify population of origin for migratory adults collected as part of a WDFW telemetry study of bull trout movement and collected in Tieton Pool below Tieton Dam by the Bureau of Reclamation. Roughly two thirds of the fish came from above the dam and the rest originated in Rattlesnake and Union creeks.
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