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Geographic Variation in the Occurrence of Tympanic Spines and Possible Genetic Differentiation in the Kelp Rockfish (Sebastes atrovirens)

Milton S. Love and Ralph J. Larson
Copeia
Vol. 1978, No. 1 (Feb. 10, 1978), pp. 53-59
DOI: 10.2307/1443821
Stable URL: http://www.jstor.org/stable/1443821
Page Count: 7
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Geographic Variation in the Occurrence of Tympanic Spines and Possible Genetic Differentiation in the Kelp Rockfish (Sebastes atrovirens)
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Abstract

The frequency of occurrence of tympanic cranial spines in the kelp rockfish (Sebastes atrovirens), an eastern Pacific scorpaenid, was examined over much of the species' geographic range. Tympanic spines occur significantly more often in individuals from the southern part of the range. The data indicate that S. atrovirens fall roughly into two groups: central and southern California, though there is clinal variation within each group. It is hypothesized that the occurrence of tympanic spines is determined genetically, and that the difference in tympanic spine occurrence between the northern and southern parts of S. atrovirens' range is due to low gene flow between northern and southern populations. This restricted gene flow may be due to the actions of the California Current and the southern California eddy. Recruitment of S. atrovirens in central California would come primarily from local eddies of the California Current in central California, while recruitment in southern California would come primarily from southern California larvae entrained in the southern California eddy.

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