Table 1 Eigenvalues, percentage of total variance explained, and principal component loadings from analysis of environmental data extracted from the localities of the 39 populations.

From: Geographic variation in wing size and shape of the grasshopper Trilophidia annulata (Orthoptera: Oedipodidae): morphological trait variations follow an ecogeographical rule

Variable code

Variable type

PCA axes

1

2

3

4

 

Eigenvalue

12.114

4.444

2.567

1.602

 

% total variance explained

52.668

19.320

11.161

6.966

Lat

Latitude

−0.931

0.292

−0.009

0.064

Long

Longitude

−0.118

0.606

0.178

0.577

SR

Solar radiation

−0.180

−0.764

0.221

0.150

Alt

Elevation of site

−0.186

−0.684

−0.587

−0.215

Bio 1

Annual mean temperature

0.940

−0.201

0.259

−0.071

Bio 2

Mean monthly temperature range

−0.594

−0.499

0.075

0.028

Bio 3

Isothermality: (Bio2/Bio7) *100

0.459

−0.821

0.048

0.032

Bio 4

Temperature seasonality (STD *100)

−0.842

0.520

0.028

0.081

Bio 5

Maximum temperature of warmest month

0.455

0.425

0.678

−0.174

Bio 6

Minimum temperature of coldest month

0.948

−0.220

0.134

−0.103

Bio 7

Temperature annual range (Bio5–Bio6)

−0.900

0.357

0.045

0.062

Bio 8

Mean temperature of wettest quarter

0.610

0.026

0.700

0.121

Bio 9

Mean temperature of driest quarter

0.948

−0.260

0.120

−0.077

Bio 10

Mean temperature of warmest quarter

0.692

0.383

0.591

−0.058

Bio 11

Mean temperature of coldest quarter

0.926

−0.328

0.147

−0.084

Bio 12

Annual precipitation

0.923

0.180

−0.277

0.143

Bio 13

Precipitation of wettest month

0.798

0.025

−0.253

0.489

Bio 14

Precipitation of driest month

0.679

0.540

−0.356

−0.105

Bio 15

Precipitation seasonality (coefficient of variation)

−0.496

−0.372

0.183

0.723

Bio 16

Precipitation of wettest quarter

0.873

0.008

−0.264

0.360

Bio 17

Precipitation of driest quarter

0.687

0.525

−0.343

−0.112

Bio 18

Precipitation of warmest quarter

0.788

−0.082

−0.308

0.408

Bio 19

Precipitation of coldest quarter

0.659

0.532

−0.357

−0.075

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