Table 2 Model parameters for effects of color vision phenotypes and sex on fruit feeding tree bout length in sifaka.

From: Group benefit associated with polymorphic trichromacy in a Malagasy primate (Propithecus verreauxi)

Season

Model

Fixed Effects

Estimate ± S.E.

df1

t value

p

wet season

individual

(Intercept)

5.69 ± 0.49

1.2

11.67

0.036

(n = 501 bouts)

 

Individual: trichromat

0.36 ± 0.23

11.0

1.56

0.147

 

Sex: male

0.12 ± 0.15

12.3

0.78

0.450

group

(Intercept)

5.76 ± 0.48

 

11.993

 
 

Group: trichromat

0.09 ± 0.16

 

0.556

 
 

Sex: male

0.03 ± 0.15

 

0.184

 

dry season

individual

(Intercept)

5.63 ± 0.33

1.0

17.12

0.034

(n = 440 bouts)

 

Individual: trichromat

0.12 ± 0.15

9.0

0.81

0.439

 

Sex: male

0.10 ± 0.10

14.5

0.96

0.355

group

(Intercept)

5.62 ± 0.34

1.00

16.61

0.037

 

Group: trichromat

0.24 ± 0.10

428.7

2.33

0.021

 

Sex: male

0.05 ± 0.09

424.8

0.53

0.596

  1. Response variable is log-transformed. Reference categories: dichromats (for Individual), dichromat-only group (for Group), females (for Sex). Random effects: focal ID/group ID, observer ID, tree morphospecies, month, and year. Significant effects are shown in bold.
  2. 1lmerTest package t-tests use Satterthwaite approximations to df to calculate p-value.
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