Figure 6. RDA of all collections in Columbia River basin to model the
degree to which the variation in environmental variables explains the
variation in allele frequencies for candidate markers for all
collections in the greb1L haplotype block (2,3,6). The
populations are represented by text and colored black or red in
accordance with their lineage determined by DAPC in adegenet. The arrows
spatially denote a significant influence of environmental variables and
the length of the arrow indicates the extent of the effect.
Environmental variables retained were migration distance, minimum
temperature warmest month, August water temperature over a 20-year
average, annual mean temperature, isothermality, and annual
precipitation.