GEOGRAPHICAL PATTERNS OF FOUR POLYMORPHISMS IN ZOARCES VIVIPARUS AS EVIDENCE OF SELECTION

Freddy Bugge Christiansen ¹ and Ove Frydenberg ²

¹ Department of Biological Sciences, Stanford University, Stanford, California 94305
² Department of Genetics, University of Aarhus, DK-8000 Aarhus C, Denmark

Two unlinked polymorphisms of a marine teleost, one in hemoglobin and one in esterase, show parallel clines through Danish waters, while two unlinked phosphoglucosemutase polymorphisms maintain constant gene frequencies. It is argued that the clinal and the constant polymorphisms cannot be accounted for simultaneously by random genetic drift of selectively neutral genes. It is therefore concluded that selection is responsible for at least one of the two classes of geographical patterns, be it the clinal, the constant, or both.

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