Molecular Biology and Evolution, Vol 15, 104-118, Copyright © 1998 by Society for Molecular Biology and Evolution
SJ Goodman
The harbor seal (Phoca vitulina) has the most extensive distribution of any
phocid seal species. An analysis of population structure in this species
across its European range was made using 7 phocid derived microsatellites
in a sample of 1,029 individuals from 12 separate geographic areas. Despite
the species potential for long-distance movement, significant genetic
differentiation between areas was observed using an unbiased estimator of
RST. Six distinct population units were identified: Ireland-Scotland,
English east coast, Waddensea, western Scandinavia
(Norway-Kattegat-Skagerrak-west Baltic), east Baltic, and Iceland. Little
local substructuring is present along coastlines with a continuous
distribution of breeding animals, but differentiation does increase with
geographic distance. The degree of differentiation is greater over
equivalent distances where the distribution is discontinuous, such as along
coasts where breeding colonies are separated by large distances or by
stretches of open sea. Patterns of population differentiation derived from
microsatellites are very similar to those obtained from previous
mitochondrial DNA analysis and suggest that philopatry in harbor seals
operates over 300-500 km. In Europe, harbor seals have experienced a
complex demographic history and patterns of population structure are likely
to have been affected by natural environmental influences such as
Pleistocene glaciations and epizootics. Comparison of Nm values from an
unbiased estimator of RST, GST, and theta are consistent and, in some
cases, may indicate populations where conditions deviate from the
expectations of the RST model.
ORIGINAL ARTICLE
Patterns of extensive genetic differentiation and variation among European harbor seals (Phoca vitulina vitulina) revealed using microsatellite DNA polymorphisms
Department of Genetics, University of Cambridge, U.K. simon.goodman@ed.ac.uk
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