Author:
APPLEYARD SHARON A.,WARD ROBERT D.,WILLIAMS RICHARD
Abstract
Two mitochondrial DNA regions and seven microsatellite loci were examined in Patagonian
toothfish from three locations in the Southern Ocean (Macquarie Island, five collections; Heard and
McDonald Islands, four collections; Shag Rocks/South Georgia area, one collection). Striking mtDNA
heterogeneity was detected between the three fishing locations (FST=0.445, P<0.001), but spatial and
temporal collections within the same location were not significantly different. No significant overall
microsatellite differentiation between the three locations was apparent (FST=−0.009, P=0.785). However,
some individual loci showed small but significant differentiation, which in each case was attributable to
between rather than within-location differentiation. Greater differentiation of mtDNA can, in principle, be
explained either by female philopatry and male dispersal, or by its greater sensitivity to changes in effective
population size. The latter seems more likely as tagging indicates that toothfish is generally a sedentary
species. The genetic heterogeneity between the three locations indicates restricted gene flow, with the fish at
each location comprising independent units. Depletion in one location is therefore unlikely to be quickly
replaced by immigration from another.
Publisher
Cambridge University Press (CUP)
Subject
Geology,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
35 articles.
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