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Table 3 Results of generalized least squares models on body size/condition-related phenotypic and physiological traits of adult G. roeselii

From: Small-scale phenotypic differentiation along complex stream gradients in a non-native amphipod

 

(a) Body length

(b) Dry weight

(c) Gill surface area

df

χ2

p

df

χ 2

p

df

χ 2

p

Body length (covariate)

–

–

–

1

4524.10

< 0.001

1

2013.60

< 0.001

Sex

1

39.92

< 0.001

1

0.12

0.73

–

–

–

Environmental PC 1

1

23.92

< 0.001

1

1.53

0.22

1

15.20

< 0.001

Sex × env. PC 1

1

< 0.001

0.98

1

2.10

0.15

–

–

–

Environmental PC 2

1

4.00

0.046

1

9.89

0.002

1

0.84

0.36

Sex × env. PC 2

1

1.08

0.30

1

1.77

0.18

–

–

–

Environmental PC 3

1

2.47

0.12

1

0.01

0.91

1

0.00

0.99

Sex × env. PC 3

1

1.87

0.17

1

0.99

0.32

–

–

–

Environmental PC 4

1

0.71

0.40

1

6.33

0.012

1

10.37

0.001

Sex × env. PC 4

1

0.09

0.77

1

1.72

0.19

–

–

–

  1. Shown are the results of three independent models using (a) adult body size, (b) body weight, assessed after drying samples overnight (in both sexes) and (c) gill surface areas (only males) as the dependent variables. Environmental PCs (Table 2), as well as sex and body length (where applicable) were coded as independent (explanatory) variables. Significant effects are shown in bold
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Frontiers in Zoology

ISSN: 1742-9994