Going beyond species richness and abundance: robustness of community specialisation measures in short acoustic surveys

摘要: Passive Acoustic Monitoring offers promising opportunities for biodiversity assessments and species conservation is still in development. The robustness of community metrics depends on sampling effort acoustic surveys should be adjusted cost-effectiveness. Using a large-scale survey bat assemblages conducted along 5487 nights across France, we assessed the effect duration level confidence four (total activity, concern richness, specialisation index). We further investigated whether this varied habitats seasons. Overall, high (i.e., 95% similarity between cumulated nights) was reached after 2 to >20 nights, depending metric, habitat season considered. CSI required lowest duration. A higher three-dimensionally structured (e.g., forests) unfavourable bats intensive farmlands), while degree earlier more favourable non-intensive farmlands, during activity. Beyond providing recommendations design context-dependent minimum surveys, show that weighted indices such as are efficient summary measures, advocate their use when monitoring resources limited.