Chelonoidis carbonarius

Pereira-Ribeiro, Juliane, Ferreguetti, Atilla Colombo, Bergallo, Helena & Rocha, Carlos Frederico Duarte, 2024, Density, occupancy and detectability of tortoise species (Chelonoidis spp.) in the Atlantic Forest: implications for conservation and management, Journal of Natural History 58 (37 - 40), pp. 1529-1545 : 1535-1537

Chelonoidis carbonarius

We recorded 20 individuals of C. carbonarius , all detected during transects. We detected more individuals in the northern region of the VNR (70%). Most individuals of C. carbonarius were recorded in the coastal plain forest (95%), at an average distance of 329.9 m from the nearest water resource (on average, 17.8% farther away from water courses than C. denticulatus ).

We detected the species at 11 of 24 sampling sites. The estimated population size of C. carbonarius for the entire area was 105 (105 ± 21.10) individuals. The estimated probability of occupancy was 59% (0.59 ± 0.15) and the estimated detection probability was 8% (0.08 ± 0.02).

The detectability of C. carbonarius was positively influenced by the accumulated rainfall of the previous day of sampling ( Figure 2 ). The occupancy of C. carbonarius was influenced only by the distance from the water, presenting the highest probabilities of occupancy in areas closer to the water ( Figure 3 ).

Figures

Figure 2. Relationship between the probability of detection of Chelonoidis denticulatus (A) and Chelonoidis carbonarius (B) with the accumulated rainfall of the day before sampling (previous rainfall) in the Vale Natural Reserve, Brazil.

Figure 3. Relationship between the probability of occupancy of Chelonoidis denticulatus (A) and Chelonoidis carbonarius (B) with the distance from the water resource, and relationship between the probability of occupancy of Chelonoidis denticulatus and the percentage of forest cover (C) in the Vale Natural Reserve, Brazil.