Table 1
Results of GLMs exploring the effects of fish presence, turbidity and substrate type on invertebrates and macrophytes. GLMs on abundance were fitted assuming a quasi-Poisson distribution, GLMs on diversity assumed quasi-binomial distribution and all other GLMs assumed Gaussian distribution.
Explanatory variable | |||
---|---|---|---|
Response variate | Tilapia | Turbidity | Substrate |
Chironomidae: abundance (count) | No effect Exp I (F1,46 = 11.3, P = 0.002) Exp II (F1,46 = 0.6, P = 0.4) Overall (F2,93 = 0.6, P = 0.5) |
No effect Exp1 (F1,46 = 2.2, P = 0.1) Exp2 (F1,46 = 0.3, P = 0.6) Overall (F1,94 = 0.9, P = 0.4) |
Negative effect of sediment Exp1 (F3,44 = 3.9 P = 0.01) Exp2 (F3,44 = 6.8, P < 0.001) Overall (F3,93 = 8.2, P < 0.001) |
Chironomidae: diversity (Gini-Simpson) |
No effect. Exp I (F1,46 = 0.0, P = 0.9) Exp II (F1,46 = 0.9, P = 0.3) Overall (F2,93 = 0.4, P = 0.5) |
Negative effect. Exp I (F1,46 = 5.3, P = 0.03) Exp II (F1,46 = 5.6, P = 0.02) Overall (F1,94 = 10.8, P = 0.001) |
No effect. Exp I (F3,44 = 1.1 P = 0.4) Exp II (F3,44 = 0.4, P = 0.8) Overall (F3,92 = 0.4, P = 0.8) |
Non-diptera: abundance (count) |
No effect. Exp I (F1,46 = 0.0, P = 1.0) Exp II (F1,46 = 0.3, P = 0.6) Overall (F2,93 = 0.08, P = 0.8) |
Negative effect. Exp I (F1,46 = 4.9, P = 0.03) Exp II (F1,46 = 47.5, P < 0.001) Overall (F1,94 = 43.0, P < 0.001) |
Positive effect of charophytes. Exp I (F3,44 = 1.0, P = 0.4) Exp II (F3,44 = 7.9, P < 0.001) Overall (F3,93 = 5.4, P = 0.001) |
Non-diptera: diversity (Gini-Simpson) | No effect. Exp I (F1,46 = 2.1, P = 0.1) Exp II (F1,46 = 0.4, P = 0.5) Overall (F2,93 = 0.0, P = 1.0) |
Negative effect. Exp I (F1,46 = 2.1, P = 0.1) Exp II (F1,46 = 20.2, P < 0.001) Overall (F1,94 = 31.3, P < 0.001) |
No effect. Exp I (F3,44 = 1.1 P = 0.3) Exp II (F3,44 = 0.9, P = 0.4) Overall (F3,93 = 0.4, P = 0.5) |
Charophyte (dry weight) |
Negative effect Exp I (F1,10 = 9.0, P = 0.01) Exp II (F1,10 = 12.1, P = 0.007) Overall (F1,33 = 20.38, P < 0.001) |
Negative effect Exp I (F1,10 = 9.0, P = 0.01) Exp II (F1,10 = 12.9, P = 0.006) Overall (F1,33 = 12.3, P = 0.001) |
N/A |
Water lily (relative size) |
Negative effect. Exp I (F1,10 = 0.08, P = 0.7) Exp II (F1,10 = 0.8, P = 0.4) Overall (F1,34 = 8.0, P = 0.008) |
N/A | N/A |
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