New Zealand Journal of Marine and Freshwater Research abstracts
A genetic analysis of populations of Galaxias maculatus from the Bay of Plenty: implications for natal river return
JEREMY R. BARKER DAVID M. LAMBERT
Evolutionary Genetics Laboratory
Department of Zoology, University of Auckland
Private Bag, Auckland, New Zealand
Abstract
An electrophoretic analysis of four diadromous populations of
Galaxias maculatus (Jenyns) from rivers within the Bay of Plenty region was conducted to determine evidence for genetic structuring. Permanent genetic divergence might be expected if individuals consistently returned to their natal rivsrs. A contingency
%2 analysis of five of the eleven presumptive loci revealed significant differences among the four populations for two loci. Two loci also exhibited significant differences from expected frequencies of genotypes for pooled data, indicating possible divergence from random mating. However, the level of genetic differentiation, as measured by Wright's F coefficient, is low
(FST = ((.055). We suggest that the degree of differentiation recorded is a likely result of high mortality at the larval stage, but that temporal sampling should conclusively distinguish between temporal differentiation and differentiation resulting from a structured population.
Keywords Galaxias maculatus; electrophoresis; genetic differentiation and structuring; whitebait
New Zealand Journal of Marine and Freshwater Research, 1988, Vol. 22: 321-326 Crown copyright 1988Received 16 March 1987; accepted 30 October 1987
PDF file of entire paper: medium quality (471K); (scanned from paper original: notes about this process)
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