New Zealand Journal of Marine and Freshwater Research abstracts
Biochemical-genetic variation in a wild and a cultured population of the
greenshell mussel, Perna canaliculus
J. P. A. GARDNER
R. F. EYLES
A. PANDE
Island Bay Marine Laboratory
School of Biological Sciences
Victoria University of Wellington
P. O. Box 600
Wellington, New Zealand
Abstract A wild and a cultured greenshell mussel
(Perna canaliculus) population were compared for biochemical
genetic variation at seven polymorphic and four monomorphic allozyme loci.
Significant heterozygote deficiencies were observed for all polymorphic loci
(La-1, La-2, Lap, Lgg-1, Lgg-2, Pgi,
and Pgm) for both populations (except the Pgi locus of the wild
mussel population). Genotypic disequilibrium was calculated for both
populations: genotypic frequencies were significantly non-random at three pairs
of loci among the wild mussels, and significantly non-random at three different
pairs of loci among the cultured mussels. All six pairs of loci which exhibited
significant genotypic disequilibrium involved aminopeptidases, suggesting that
these loci form a linkage group, and that neither the Pgi nor the
Pgm loci are associated with this group. Exact tests for population
differentiation based upon population-specific allele distributions indicated
that four of the polymorphic loci were significantly heterogeneous among the
two populations, whereas the remaining three polymorphic loci were not. Based
upon the private allele system, the number of migrants (Nm) between the
populations was estimated to be 2.009, which, according to the private allele
system, represents a high level of gene flow. These findings are discussed with
regard to the population biology and genetic structure of this species.
Keywords greenshell mussel; Perna canaliculus; genetic
variation; gene flow; genotypic disequilibrium
New Zealand Journal of Marine and Freshwater Research, 1996: Vol 30:
435-441
0028-8330/96/3004-0435 $2.50/0 (c) The Royal Society of New Zealand
1996
Short communication
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