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Homing behaviour facilitates subtle genetic differentiation among river populations of Alosa sapidissima : microsatellites and mtDNA
Author(s) -
Waters J. M.,
Epifanio J. M.,
Gunter T.,
Brown B. L.
Publication year - 2000
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2000.tb00760.x
Subject(s) - biology , mitochondrial dna , microsatellite , population , alosa , endangered species , genetic diversity , zoology , population genetics , effective population size , evolutionary biology , genetic variation , ecology , fishery , genetics , allele , gene , fish migration , habitat , demography , sociology
Significant but subtle differentiation was detected for both microsatellite DNA and mitochondrial DNA among four populations of American shad Alosa sapidissima . The data indicate that straying among rivers is sufficient to permit only marginal population differentiation in this species, but suggest that individual river populations should be managed as distinct stocks. Comparison of the Hudson and Columbia populations, the latter derived from the former over 100 years ago, revealed only a slight reduction in microsatellite DNA variation for the founded population but halving of mitochondrial DNA, consistent with the haploid maternal inheritance of the latter marker. The depleted and endangered James River (Virginia) population and two other Atlantic coast populations exhibited similar levels of microsatellite DNA variation, but mtDNA diversity in the James River was marginally lower than in other Atlantic populations, again consistent with the low effective population size of mtDNA.