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Population Structure of the Pacific Angel Shark, Squatina californica (Squatiniformes: Squatinidae), around the California Channel Islands

Ingo H. Gaida
Copeia
Vol. 1997, No. 4 (Dec. 9, 1997), pp. 738-744
DOI: 10.2307/1447291
Stable URL: http://www.jstor.org/stable/1447291
Page Count: 7
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Population Structure of the Pacific Angel Shark, Squatina californica (Squatiniformes: Squatinidae), around the California Channel Islands
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Abstract

Starch gel electrophoresis was employed to examine genetic variability in three samples of the Pacific angel shark, Squatina californica, around the California Channel Islands. Gene products of 25 enzyme systems encoded by 29 presumptive loci were examined. Seven loci were polymorphic, with a mean sample heterozygosity of 0.056. F-statistics and contingency chi-square analysis revealed significant genetic divergence between northern samples (Santa Rosa and Santa Cruz Islands) and a southern sample (San Clemente Island). This apparent barrier to gene flow may result from a combination of behavioral characteristics and topography of the sea floor around the California Channel Islands. Significant allele-frequency differences in an elasmobranch species have not been detected previously over such short geographical distances.

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