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Differences in allele frequencies of Aat between high- and mid-rocky shore populations of Littorina saxatilis (Olivi) suggest selection in this enzyme locus

Published online by Cambridge University Press:  14 April 2009

Kerstin Johannesson  and
Bo Johannesson
Kerstin Johannesson*
Affiliation:
Tjärnö Marine Biological Laboratory, Pl. 2781, S-452 00 Strömstad, Sweden
Bo Johannesson
Affiliation:
Tjärnö Marine Biological Laboratory, Pl. 2781, S-452 00 Strömstad, Sweden
*
† Corresponding author.
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Samples of the intertidal prosobranch Littorina saxatilis were collected along vertical transects from high- to mid-store levels at five different geographic locations of western Europe. Electrophoretic screening of ten metabolic enzymes revealed five highly polymorphic loci. Four of these showed no or few significant differences in allele frequencies between high- and mid-shore samples of Littorina saxatilis. The fifth locus, Aat (aspartate aminotransferase, EC 2.6.1.1), showed clinal variation in allele frequencies over the few metres of each transect, suggesting that this locus, or a coupled locus, is under selection with a slow allele (Aat100) favoured in mid-shore habitats and a faster allele (Aat120) selected for in the high littoral fringe.

Type
Research Article
Information
Genetics Research , Volume 54 , Issue 1 , August 1989 , pp. 7 - 12
Copyright
Copyright © Cambridge University Press 1989

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