Table 2.

Results of generalized linear mixed-model analyses to test the effect of cichlid ecomorphs on carbon and nitrogen stable isotope ratios of their muscles

δ 13 C
Ecomorph	Estimate	SE	DF	t value	p
Intercept (biter)	−15.75	2.69	13.0	−5.86	<0.001
browser	2.51	2.87	13.0	0.88	NS
grazer	2.76	2.87	13.0	0.96	NS
plankton eater	−5.29	3.29	13.0	−1.61	NS
scooper	0.42	3.80	13.0	0.11	NS
scraper	7.02	3.80	13.0	1.85	NS
Post-hoc test	Estimate	SE		z value	p
browser-biter	2.51	2.87		0.88	NS
grazer-biter	2.76	2.87		0.96	NS
plankton eater-biter	−5.29	3.29		−1.61	NS
scooper-biter	0.42	3.80		0.11	NS
scraper-biter	7.02	3.80		1.85	NS
grazer-browser	0.25	1.44		0.17	NS
plankton eater-browser	−7.80	2.15		−3.62	<0.01
scooper-browser	−2.10	2.87		−0.73	NS
scraper-browser	4.50	2.87		1.57	NS
plankton eater-grazer	−8.05	2.15		−3.74	<0.01
scooper-grazer	−2.34	2.87		−0.82	NS
scraper-grazer	4.26	2.87		1.48	NS
scooper-plankton eater	5.70	3.29		1.73	NS
scraper-plankton eater	12.30	3.29		3.74	<0.01
scraper-scooper	6.60	3.80		1.74	NS
δ 15 N
Ecomorph	Estimate	SE	DF	t value	p
Intercept (biter)	3.87	0.81	13.0	4.77	<0.001
browser	1.64	0.87	13.0	1.89	NS
grazer	0.30	0.87	13.0	0.34	NS
plankton eater	2.13	0.99	13.0	2.14	NS
scooper	2.29	1.15	13.0	2.00	NS
scraper	0.60	1.15	13.0	0.52	NS
Post-hoc test	Estimate	SE		z value	p
browser-biter	1.64	0.87		1.89	NS
grazer-biter	0.30	0.87		0.34	NS
plankton eater-biter	2.13	0.99		2.14	NS
scooper-biter	2.29	1.15		2.00	NS
scraper-biter	0.60	1.15		0.52	NS
grazer-browser	−1.34	0.43		−3.10	<0.05
plankton eater-browser	0.49	0.65		0.75	NS
scooper-browser	0.65	0.87		0.75	NS
scraper-browser	−1.04	0.87		−1.20	NS
plankton eater-grazer	1.83	0.65		2.82	<0.05
scooper-grazer	1.99	0.87		2.30	NS
scraper-grazer	0.30	0.87		0.35	NS
scooper-plankton eater	0.16	0.99		0.16	NS
scraper-plankton eater	−1.53	0.99		−1.54	NS
scraper-scooper	−1.69	1.15		−1.47	NS

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