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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