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Table 2 Contributions of habitat factors to the principal components in foraging areas in the farming areas

From: Foraging habitat selection of overwintering Black-necked Cranes in the farming area surrounding the Caohai Wetland, Guizhou Province, China

FactorsPC-1 (27.525)PC-2 (42.899)PC-3 (55.785)PC-4 (65.827)
Slope aspect− 0.2590.484− 0.2140.639
Slope degree (°)− 0.6800.254− 0.008− 0.286
Slope position0.351− 0.463− 0.221− 0.007
Distance to road (m)0.0920.3880.6980.016
Distance to water (m)0.661− 0.0530.175− 0.232
Distance to tillagers (m)0.4260.1890.6310.240
Distance to settlement (m)0.1870.678− 0.433− 0.048
Tillage methods− 0.8750.1300.170− 0.064
Crop remains (g/m2)0.7710.283− 0.2350.188
Food richness− 0.281− 0.5270.0750.600