Figure 1.
Focal study area, Alfenas—MG, Brazil.
The Atlantic Forest remnants in the region are highly fragmented, with the vegetation reduced to 4% of the original area. The forest fragments were manually vectorized, scale 1:10,000, followed by visual grading. Figure originally produced by LGS based on Google Earth images, for illustrative purposes only.
Table 1.
Characteristics of the 45 focal fragments regarding the study metrics.
Table 2.
Characteristics of the 20 fragments employed for model validation, regarding the study metrics.
Figure 2.
Illustration of the approach for calculating the isolation metric.
Figure 3.
Representation of the structure of the three main types of matrices (sugarcane plantations, coffee plantations and pastures) found in the region of Alfenas-MG.
The structure of the sample unit (forest remnant) was also represented.
Table 3.
Ecological hypotheses associated with the multiple logistic regression models that were tested to explain the occurrence of Callicebus nigrifrons, Callithrix aurita and Sapajus nigritus in forest remnants in a highly fragmented landscape.
Figure 4.
Presence/absence data for the three study species in the focal fragments.
Figures originally produced by LGS based on Google Earth images, for illustrative purposes only.
Table 4.
Comparison of competing predictive models of species occurrence for Callicebus nigrifrons, Callithrix aurita and Sapajus nigritus, through the Akaike Information Criterion, based on occurrence information in the region of Alfenas—Brazil.
Table 5.
Cumulative weight of evidence (wAICc) for each individual explanatory variable of primate occurrence, obtained by the sum of the weight of models in which the variables appear.
Figure 5.
Fitted logistic regression curves for the occurrence of the studied primate species against best predictor, fragment area.
(A) Callicebus nigrifrons, (B) Callithrix aurita and (C) Sapajus nigritus.
Table 6.
Validation of plausible models explaining the occurrence of three Neotropical primate species in the region of Alfenas, Brazil with the Kappa test, comparing prediction of species occurrence with real presence data in 20 fragments in the region of Poço Fundo, Brazil.
Figure 6.
Predicted (according to plausible models that were valid according to the Kappa test) and observed primate presence/absence in the validation region, Poço Fundo—MG, Brazil.
a) Callicebus nigrifrons—Size + visibility model; b) Sapajus nigritus—Size only model; c) S. nigritus—Size + matrix type model. Figures originally produced by LGS based on Google Earth images, for illustrative purposes only.