You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
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
Vol. 1978, No. 1 (Feb. 10, 1978), pp. 53-59
Stable URL: http://www.jstor.org/stable/1443821
Page Count: 7
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
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.