Teleost fish larvae are theoretically capable of immigrating to new populations hundreds of kilometers away. However, it is unknown whether fish populations at island sites in the Southern California Bight depend on outside recruitment or are sustained by locally produced progeny. I genotyped 159 kelp bass ( Paralabrax clathratus) at 5 polymorphic microsatellite loci to test for genetic drift at two offshore California Channel Island sites as compared to one inshore island and one mainland site. Overall I found significant allele frequency differences and gene flow imbalances at offshore sites as compared to inshore sites, which coupled with demographic differences in population structure and the identification of all four sites as segments of a partially differentiated but connected Bight-wide population supports a hypothesis of periodic inshore-derived recruitment to the outer islands of the Southern California Bight, possibly due to El Niño Southern Oscillation events.
|Advisor:||Wilson, Raymond R., Jr.|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 49/04M, Masters Abstracts International|
|Subjects:||Ecology, Genetics, Aquatic sciences|
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