Gene flow and introgression within and among three species of rockfishes, Sebastes auriculatus, S. caurinus, and S. maliger

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Abstract
The genus Sebastes comprises at least 100 species worldwide and is the largest genus of marine fishes in the eastern North Pacific. Species within the genus are closely related, and many sibling species exist. Allozyme analysis and restriction analyses of mitochondrial DNA (mtDNA) were used to investigate genetic differentiation and introgression within and among three nearshore species of the subgenus Pteropodus, Sebastes auriculatus (brown rockfish), S. caurinus (copper rockfish), and S. maliger (quillback rockfish). Geographic differentiation was detected within each species in collections ranging from California to southeast Alaska. In addition, significant shifts in allozyme frequencies were noted for S. maliger from Puget Sound, Washington, and adjacent areas separated by less than 70 km. Alleles characteristic of the other two species were absent form samples of S. maliger outside Puget Sound but were consistently observed within Puget Sound. Joint analysis of the allozyme and mtDNA data indicates that introgression may be occurring between all three species in Puget Sound and that it may be an important source of diversity in Sebastes.

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