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Table 3 Results of the generalized linear mixed-model analysis for testing the effect of cichlid ecomorph on carbon and nitrogen stable isotope ratios of periphyton within their territories

From: Depth segregation and diet disparity revealed by stable isotope analyses in sympatric herbivorous cichlids in Lake Tanganyika

δ 13 C

     

  Ecomorph

Estimate

SE

DF

t value

p

   Intercept (browser)

−13.17

1.20

6.4

−10.98

<0.001

   grazer

 −1.24

1.61

6.4

 −0.77

NS

   scraper

 3.12

2.63

5.9

 1.19

NS

  Post-hoc test

Estimate

SE

 

z value

p

   grazer-browser

 −1.24

1.61

 

 −0.77

NS

   scraper-browser

 3.12

2.63

 

 1.19

NS

   scraper-grazer

 4.36

2.57

 

 1.69

NS

δ 15 N

     

  Ecomorph

Estimate

SE

DF

t value

p

   Intercept (browser)

 −0.81

0.30

7.0

 −2.70

<0.05

   grazer

 −0.57

0.41

7.2

 −1.41

NS

   scraper

 −1.17

0.65

6.1

 −1.80

NS

  Post-hoc test

Estimate

SE

 

z value

p

   grazer-browser

 −0.57

0.41

 

 −1.41

NS

   scraper-browser

 −1.17

0.65

 

 −1.80

NS

   scraper-grazer

 −0.59

0.64

 

 −0.93

NS

  1. Species are included as a nested factor of ecomorph. SE, standard error; DF, degree of freedom; NS, not significant.