Research Article
Spatial Distribution and Dispersal Patterns of Central North American Freshwater Crayfish (Decapoda: Cambaridae) with Emphasis on Implications of Glacial Refugia
Table 2
Species loadings on the four principle components (62% of variance) in the PCA analysis. PC I (20% of variance) a gradient of species associated with unglaciated sites (negative loading) and species associated with glaciated sites (positive loading). PC II (15% of variance) represents a gradient of Orconectes virilis to Orconectes immunis dominance.
|