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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

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