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Table 1 Factor loadings of current climate (1960–1990) variables of selected 125 PAs in the Alpine biogeographical region on PCA axes 1 and 2

From: Predicting the effectiveness of protected areas of Natura 2000 under climate change

Climate variable Abbreviation Factor loadings
PC 1
Factor loadings
PC2
Annual mean temperature Ann-temp − 0.19 0.34
Mean diurnal range M-temp range 0.014 0.29
Isothermality Isotherm − 0.25 0.20
Temperature seasonality Temp seas 0.30 0.019
Max temperature of warmest month Warmest m-temp − 0.07 0.41
Min temperature of coldest month Coldest m-tem − 0.27 0.22
Temperature annual range Ann-temp rang 0.27 0.09
Mean temperature of the wettest quarter Wettest q-temp 0.06 0.25
Mean temperature of the driest quarter Driest q-temp − 0.19 0.21
Mean temperature of the warmest quarter Warmest q-temp − 0.08 0.40
Mean temperature of the coldest quarter Coldest q-temp − 0.26 0.26
Annual precipitation Ann precip − 0.29 − 0.15
Precipitation of the wettest month Wettest m-precip − 0.24 − 0.18
Precipitation of the driest month Driest m-preci − 0.29 − 0.16
Precipitation seasonality Precip seas 0.24 − 0.01
Precipitation of the wettest quarter Wettest q-precip − 0.24 − 0.17
Precipitation of the driest quarter Driest q-precip − 0.30 − 0.15
Precipitation of the warmest quarter Warmest q-precip − 0.18 − 0.18
Precipitation of the coldest quarter Coldest q-precip −0.28 − 0.15