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Table 3 Results of the random-slope mixed effects model used to test for effects of radiant heat treatment and larval age on colouration darkness in both green and brown coloured morphs

From: What triggers colour change? Effects of background colour and temperature on the development of an alpine grasshopper

 

Round 1

Round 2

 

slope

SE

t

p

slope

SE

t

p

 

N2 (n = 42)

N2 (n = 35)

Intercept

1.79

0.25

7.16

<0.0001

1.92

0.33

5.77

<0.0001

High radiant heat treatment

0.28

0.34

0.82

0.42

1.02

0.52

1.98

0.057

Larval age

0.063

0.017

3.78

0.00054

0.18

0.061

2.92

0.0065

Treatment × Age

−0.067

0.027

−2.49

0.022

−0.38

0.12

−3.29

0.0025

 

N3 (n = 34)

N3 (n = 34)

Intercept

2.23

0.28

8.04

<0.0001

2.55

0.2

12.77

<0.0001

High radiant heat treatment

0.23

0.35

0.66

0.51

0.39

0.31

1.27

0.21

Larval age

0.036

0.014

2.65

0.013

0.035

0.045

0.79

0.43

Treatment × Age

−0.088

0.023

−3.82

0.00062

−0.12

0.076

−1.62

0.11

 

N4 (n = 22)

N4 (n = 32)

Intercept

2.03

0.19

10.62

<0.0001

1.85

0.2

9.06

<0.0001

High radiant heat treatment

NA

NA

NA

NA

1.04

0.3

3.42

0.0019

Larval age

0.033

0.015

2.21

0.039

0.078

0.034

2.26

0.032

Treatment × Age

NA

NA

NA

NA

−0.22

0.061

−3.54

0.0014

 

IM (n = 21)

IM (n = 29)

Intercept

NA

NA

NA

NA

1.88

0.36

5.21

<0.0001

High radiant heat treatment

NA

NA

NA

NA

0.34

0.45

0.76

0.45

Larval age

NA

NA

NA

NA

0.21

0.066

3.26

0.0032

Treatment × Age

NA

NA

NA

NA

−0.092

0.082

−1.13

0.27

  1. Panels on the left and right side of the table show results for the first and second round, respectively. The number of individuals present in the experimental setup is depicted at the top of each block. The analysis of N4 in the first round only includes the test for the effect of age because almost all individuals in the low radiant heat treatment had died at the start of the nymphal stage. NA = not available