Add the habitat and cover as covariates into occupancy models using PRESENCE. This will estimate occupancy (ratio of occupied sites) for each species modelling each species detectability and will tell you which covariates explain both.detectability and occupancies.

I think exactly as Christian. The occupancy and detection probability can explain the influence of habitat and antrophogenic variables upon distribution and abundance, and at the same time, it could permit detect some survey biases.

Hai, First of all regarding your sampling days, if you sample only for 15 days you tend to miss lot of captures, ie. you will not capture all the individuals in the area.  you might  worried about closure. if there is a behavioural response by animal for capture your closure test is not valid (read the otis etal papers on closure test).  So increase the trapping days to capture all individuals in the area most probably you need to double the sampling period.  In terms of habitat factors they broadly influence the presence of these carnivores. at your trap level the capture depends on movement of animals especially the large carnivores so check the capture rate of small carnivores in comparison with other species. Primarily the prey species abundance you might need to do sampling for rodents and other small mammals.  this could primarily influence small carnivore movement..  remember Prey and predator avoidance is the key for their survival. regards