A. Hamann et al., Multivariate analysis of allozymic and quantitative trait variation in Alnus rubra: geographic patterns and evolutionary implications, CAN J FORES, 28(10), 1998, pp. 1557-1565
Citations number
36
Categorie Soggetti
Plant Sciences
Journal title
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
Frequency data from six polymorphic allozyme loci and measurements of six q
uantitative traits were used to examine geographic differentiation among 65
British Columbia provenances of red alder (Alnus rubra Bong.). Principal c
omponents analysis showed that variation in quantitative traits can be redu
ced to two underlying dimensions, one representing general vigor including
the termination of the growing period and the other being the start of the
growing period. Canonical correlation analysis among quantitative traits, a
llozyme frequencies, and geographic variables revealed complex associations
of quantitative traits with the latitude, distance to the coast, and eleva
tion of the seed source. There were no significant correlations among alloz
yme frequencies and quantitative traits, but the frequency of the most comm
on allele at most loci decreased with latitude. Further, cluster analysis b
ased on Nei's genetic distance revealed a strong differentiation among isla
nd and mainland provenances at one allozyme locus. This differentiation can
be interpreted as a result of migration from two different refugia since t
he last glaciation. The island populations presumably originate solely from
isolated coastal refugia west of the Cordilleran ice sheet, while mainland
populations were also recruited from areas south of the ice.