Skip to main content
Forest Ecosystems

Table 4 Amount of explained variance for the principal component loadings of provenances at each test site on the principal component axes and correlation with geographical variables of provenance origin

From: Dendroclimatic analysis of white pine (Pinus strobus L.) using long-term provenance test sites across eastern North America

Test site location

Explained variance PC1 (%)

Explained variance PC2 (%)

Variables associated with PC1

Variables associated with PC2

Wabeno, WI

31.9*

11.5

NS

Latitude (ρ = −0.70), Elevation (ρ = 0.63)

Manistique, MI

52.8*

32.0*

Latitude (ρ = 0.63), Longitude (ρ = 0.51)

Latitude (ρ = − 0.55)

Pine River, MI

46.6*

43.0*

Elevation (ρ = − 0.63)

Elevation (ρ = 0.72)

Newaygo, MI

52.1*

33.8*

Distance (ρ = − 0.65)

Latitude (ρ = 0.61)

Turkey Point, ON

41.8*

26.1*

NS

NS

Ganaraska, ON

58.8*

29.1*

NS

NS

Orono, ME

41.2*

46.7*

Distance (ρ = 0.71), Longitude (ρ = − 0.69)

Longitude (ρ = 0.69), Distance (ρ = − 0.68)

  1. Note: Statistical significance of explained variance in test sites is indicated by an asterisk. NS no significant variables associated with a principal component. Significant Spearman’s rank correlation coefficients (ρ) are provided in parentheses
Back to article page