Table 1.
Estimated density of gorillas at five sites from line-transect surveys.
Table 2.
Changes in encounter rate at 10 sites across Grauer’s gorilla range.
Table 3.
Model results comparing deviance values and percentage of deviance explained.
Fig 1.
Map of the probability of presence for Grauer’s gorilla.
Occupancy probability was mapped using three covariables (tree cover, altitude and distance to recent deforestation) and a spatial autocorrelation (left panel). The probability threshold maximising the TSS was 0.35. This threshold was used to derive a gorilla distribution range (upper right panel) for which presence probabilities were greater than this value (grey = less than 0.35).
Fig 2.
The mean (centre) and 95% confidence interval (left: lower bound; right: upper bound) of the probability of presence for Grauer’s gorilla.
The maps also show the location of cells sampled (grey dots) with cells where gorilla sign was observed (black crosses).
Fig 3.
The mean (centre) and 95% confidence interval (left: lower bound; right upper bound) of the gorilla distribution range using the same boundaries as Fig 2.