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Allozyme diversity and genetic structure in South-Western populations of heather, Calluna vulgaris
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Allozyme diversity and genetic structure in South-Western populations of heather, Calluna vulgaris
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Journal Article
Allozyme diversity and genetic structure in South-Western populations of heather, Calluna vulgaris
1997
Overview
Genetic diversity, population genetic structure and gene flow in
Calluna vulgaris (L.) Hull were assessed by means
of seven allozyme loci scored in 18 populations from the South-Western
area
of the species' range. Genetic
diversity was lower (HT=0·20) than
reported for long-lived widespread species but was characterized by a high
number of alleles per locus (5·60 at the species level) of which
more
than 70% were rare. More than 95% of genetic
variation was found at the intrapopulation level
(GST=0·047). High levels of past gene flow
were inferred, based
on the allozyme data (Nm=5·2 from
GST, Nm=10·2 from the
‘private allele’ method). Calluna vulgaris exhibited
several geographic patterns of genetic variation. Both cluster analysis,
constructed with various genetic distances
and principal components analysis showed that Spanish and Pyrenean populations
were clearly different from
those collected in the Massif Central and Belgium. Also, a trend for
decreasing genetic diversity towards Northern
populations was detected. These patterns might be related to the
post-glacial history of Calluna. In addition, it
is shown that isolation by distance has played a role in the geographic
shaping of genetic variation in this species.
Publisher
Cambridge University Press,Blackwell Publishing Ltd,Blackwell
