Table 3 Results of the stepwise linear regressions predicting wing shape changes in T. annulata based on a variety of environmental measures.

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

(a) Dependent with PCs Forewing shape

 

Coefficient

T

P

Intercept

−5.128−11

0.000

1.000

PC1 environment

0.018

8.681

0.000

PC2 environment

PC3 environment

PC4 environment

PC2 Forewing shape, Model: no factors entry into model.

PC3 Forewing shape, Model: R 2  = 0.361; F = 10.186; df = 2, 38; P < 0.001

Intercept

−1.613−8

0.000

1.000

PC1 environment

PC2 environment

−0.002

−3.259

0.002

PC3 environment

0.002

3.123

0.004

PC4 environment

(b) Dependent with PCs Hindwing shape

PC1 Hindwing shape, Model: no factors entry into model.

PC2 Hindwing shape, Model: no factors entry into model.

PC3 Hindwing shape, Model: no factors entry into model.

  1. (a) Dependent variables: PC1, PC2, PC3 for forewing shape, independent variables: PC1, PC2, PC3, PC4 for environmental measures; (b) dependent variables: PC1, PC2, PC3 for hindwing shape, independent variables: PC1, PC2, PC3, PC4 for environmental measures.