Élaborer un plan d’échantillonnage acoustique fiable avec les logiciels «PRESENCE» et «GENPRES»

Acoustic sampling of bats is increasingly used to collect data on species occurrence for monitoring and conservation purposes. However acoustic sampling schemes are prone to be biased and inefficient if they are not planned and conducted according to scientific standards. Here we used two open source software tools (PRESENCE and GENPRES) to develop and evaluate an effective acoustic sampling of bats. Based on the acoustic data from the revision of the Swiss Red List of endangered bats we used PRESENCE to calculate the occupancy and detection probabilities of 20 bat species occurring in forest habitat. These probabilities were then processed in GENPRES to assess the sampling effort with an optimal effort benefit ratio required to get the best precisions on bat occupancy. We modelled different spatio temporal scenarios by varying the number of sampling sites and the number of visits. To validate our models the prediction from GENPRES were tested with independent field data. We found that the precisions on the bat occupancy probabilities assessed with the field data were improved for the species studied and optimized for four of them. Thus we conclude that PRESENCE and GENPRES are accurate and useful complementary tools for the development of reliable guidelines for an accurate acoustic sampling design of bat species.