Table 2

GLM models (with their Explained deviance and Adjustment quality) for the abundance of the three most frequent native post-metamorphic amphibians, in San Carlos. For both exploratory variables, the estimated coefficient, the residual deviance, the P-value, and the effect (positive “+” or negative “–”) are included. When a variable was not statistically significant it is indicated with a “NS”. The sampling date was always included as an explanatory variable, because it denotes the experimental design. The sign “*” indicates a statistically significative effect of this factorial variable.

GLM Estimated coefficient Residual deviance P-value Effect
Boana pulchella post-metamorphic abundance (Explained deviance 50.4; Adjustment quality 0.73)
(Intercept) 0.015      
Observed bullfrog abundance   40.00 0.13 NS
Sampling date * 42.26 <0.001  
Leptodactylus luctator post-metamorphic abundance (Explained deviance 22.9; Adjustment quality 0.95)
(Intercept) 5.7      
Observed bullfrog abundance   52.06 0.38 NS
Sampling date * 52.86 0.002  
Pseudis minuta post-metamorphic abundance (Explained deviance 37.8; Adjustment quality 0.51)
(Intercept) 0.62      
Observed bullfrog abundance 3.5 E−9 28.34 0.002
Sampling date   37.74 0.051 NS

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