Table 5 Results of generalized linear models for testing the effect of herbivorous cichlid species of each ecomorph on carbon and nitrogen stable isotope ratios of periphyton within their territories

 browser

Species

Estimate

SE

t value

p

Intercept (Pcur)

−11.6

1.3

 −9.1

<0.001

Tmoo

 −1.4

2.1

 −0.7

NS

Ttem

 −4.5

1.9

 −2.3

<0.05

Vmoo

 −0.5

1.8

 −0.3

NS

 grazer

Species

Estimate

SE

t value

p

Intercept (Iloo)

−15.9

1.6

−10.2

<0.001

Pmac

 3.2

2.0

 1.6

NS

Ppol

 4.1

2.1

 2.0

NS

Phor

 −2.9

2.2

 −1.3

NS

Ptre

 2.3

1.9

 1.2

NS

δ ¹⁵ N

 browser

Estimate

SE

t value

p

Intercept (Pcur)

 −1.0

0.4

 −2.3

<0.05

Tmoo

 −0.3

0.7

 −0.5

NS

Ttem

 1.0

0.6

 1.7

NS

Vmoo

 −0.1

0.6

 −0.2

NS

 grazer

Estimate

SE

t value

p

Intercept (Iloo)

 −1.0

0.5

 −2.0

NS

Pmac

 0.2

0.7

 0.3

NS

Ppol

 −0.7

0.7

 −1.1

NS

Phor

 0.0

0.7

 0.0

NS

Ptre

 −1.1

0.7

 −1.7

NS