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Article Dans Une Revue Bioacoustics Année : 2019

Potentiality of the bat pass duration measure for studies dealing with bat activity

Résumé

Acoustic detectors have become increasingly used by bat workers to investigate bat ecology and assess impacts of anthropogenic pressures. Within these studies, the metric used, "bat activity," is based on the number of bat passes, without considering the bat pass duration (i.e., each event of a bat detected within the volume of an ultrasonic detector); we expected that bat pass duration may contain information about site quality in terms of potentialities for foraging. Because bats are expected to have a more sinuous trajectory and slower velocity when they exhibit foraging behaviour, as opposed to commuting behaviour, we hypothesize a greater bat pass duration in favourable habitats; during seasons with important energetic demands; or during night pic activity. We datasets from a large-scale acoustic bat survey (n=2890 sites), allowing a total of 24597 bat pass measures from 6 taxa, and performed GLMM modelling. We detected a significant effect of habitat type on bat pass duration for five taxa. Smaller bat pass durations were detected in the beginning of the night. We detected longer pass durations during the lactation period or just before hibernating, while weather conditions or ageing and wear of the detector rarely influenced bat pass duration. Bat pass duration appears to be a simple and easy measure for position calls on a gradient between commuting vs. foraging behaviour. We suggest that the traditional measure of bat activity may be weighted by bat pass duration by giving more weight to the events with potentially greater links to foraging behaviour.
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Dates et versions

hal-02554171 , version 1 (25-04-2020)

Identifiants

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Christian Kerbiriou, Yves Bas, Isabelle Le Viol, Romain Lorrillière, Justine Mougnot, et al.. Potentiality of the bat pass duration measure for studies dealing with bat activity. Bioacoustics, 2019, 28 (2), pp.177-192. ⟨10.1080/09524622.2017.1423517⟩. ⟨hal-02554171⟩
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