Table 2. Estimates of total population size of Crocodylus moreletii occurring in the region of Calakmul based on five different estimation approaches.

Approach	Total population size
MPSGLM	7,753 (7,190–8,361)
VFMGLM	9,619 (8,989–10,294)
N-Mixture ZIP	10,440 (9,800–11,123)
MPS3	5,567
VFM3	6,884 (5,002–9,224)
N-Mixture ZIP3	8,322 (6,538–10,105)

Note:

MPS, crocodile count data alone (without considering detection probability); VFM, King’s visible fraction method; MPS^GLM, Generalized linear model considering the relation between MPS and waterbody perimeter; VFM^GLM, Generalized linear model considering the relation between VFM and waterbody perimeter; ZIP, Zero Inflated Poisson N-mixture approach. ^GLM represents total population size calculated through generalized linear model considering the relation between local abundance (MPS or VFM) and waterbody perimeter. ³ Total population size calculated thorough the application of a rule of three: Range inside parentheses represent the lower and upper prediction range within a 95% confidence for total abundance of crocodiles in Calakmul.