Limited realized dispersal and introgressive hybridization influence genetic structure and conservation strategies for brown rockfish, <Emphasis Type="Italic">Sebastes auriculatus</Emphasis> |
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Authors: | Email author" target="_blank">Vincent?P?BuonaccorsiEmail author Carol?A?Kimbrell Eric?A?Lynn Russell?D?Vetter |
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Institution: | (1) Southwest Fisheries Science Center, National Marine Fisheries Service, 8604 La Jolla Shores Dr., La Jolla, California, 92038, USA;(2) Present address: Department of Biology, Juniata College, 1700 Moore Street, Huntingdon, Pennsylvania 16652, USA |
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Abstract: | Understanding patterns of connectivity among marine fish populations with demersal adults and pelagic larvae is critical for
effective conservation of west coast rockfishes. The brown rockfish (Sebastes auriculatus) occurs in nearshore habitat and is common from northern Baja California, Mexico to northern California, rare off the outer
coast of Oregon and Washington and again common in the inland waters of Puget Sound, Washington. Here we examine patterns
of microsatellite DNA diversity from throughout the species’ range as an indirect measure of long-term trends in larval dispersal.
Genetic divergence was large and highly significant over all populations (F
ST=0.056, P<0.0001), and was significantly correlated with geographic distance when considering coastal populations. The best estimates
of mean coastal dispersal distance were on the order of 10 km or less per generation. Diversity was relatively low in the
Puget Sound, suggesting that Puget Sound rockfish populations experienced a post-glacial founder effect followed by genetic
isolation and low effective population size. Puget Sound individuals appeared to have recent mixed ancestry as a result of
introgression with S. maliger and S. caurinus. Genetic isolation of Puget Sound fish provides a basis for consideration as a Distinct Population Segment (DPS) under the
provisions of the Endangered Species Act. We recommend that coastal brown rockfish fisheries be managed at regional rather
than coast-wide scales, and that design of marine reserve networks considers the surprisingly low realized dispersal distance
of some species with high dispersal potential. |
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Keywords: | Endangered Species Act isolation-by-distance marine reserves mean larval dispersal distance |
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