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Fig. 3 | Avian Research

Fig. 3

From: Nest box selection and reproduction of European Rollers in Central Italy: a 7-year study

Fig. 3

Graphic summary of results of generalized linear mixed models of habitat variables on nest boxes occupancy, clutch size, hatching success, fledging success and breeding success, grouped by five series of considered predictors: nest position (distances from habitats), habitat composition (percentages of each habitat in a 600 m radius buffer from the nest box), terrain (average altitude and incoming solar radiation in the 600 m buffer) and habitat structure (landscape metrics in the 600 m radius buffer). Each circle represents the effect (β: regression coefficients) of the considered predictor on the response variable in the final average models. Blue circles indicate a negative effect, yellow circles a positive effect. Colour saturation is a measure of the predictive importance (Σw: sum of Akaike’s weight). (•) indicates that the 95% confidence intervals don’t overlap with 0, and (×) indicates that they do

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