Abstract
Different bat species are known to differ in their detectability. Having available presence-absence data from 100 randomly stratified selected 1 km2 squares in the north of the Netherlands, collected during autumn 2009 and spring 2010 following Environmental Impact Assessment protocols, we calculated probabilities of occupancy and detection for ten bat species. Not only did we investigate their presence in general but also of the three main functions a landscape has for a bat: roosting, commuting and foraging. The four most commonly detected species were Pipistrellus pipistrellus, Pipistrellus nathusii, Eptesicus serotinus and Myotis daubentonii. For all species, roosting was the function detected least while the function of foraging was detected most for most species. Probability of detection was highest for P. pipistrellus (0.79), followed by P. nathusii and E. serotinus. They are all relatively loud species, whose presence is hardly missed. For the other seven species, probability of detection was below 0.4 with the lowest value for Plecotus auritus (0.11). The latter species has a very soft echolocation call and is thus often not detected even when present. Our study is the first to use occupancy modelling for European bats. Our results show that the number of visits required to obtain a reliable approximation of occupancy differs widely: from two visits for both Pipistrellus species, to three for E. serotinus and M. daubentonii and even ten for P. auritus. Especially for the latter species, other survey methods may be better employed. This has implications for the design of surveys for Environmental Impact Assessments.
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Acknowledgements
We would like to thank all field workers from Tauw and Zoogdiervereniging VZZ for making this paper possible. This study was funded by TenneT TSO bv. Wim Heijligers and Remco Schreuders, formerly from Tauw bv, acted as project leaders for the field research that formed the basis of this study.
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This study was funded by TenneT TSO bv.
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Jasja Dekker and Wiegert Steen performed main analyses. Jasja Dekker, Herman Bouman and Roland van der Vliet wrote the first drafts of the manuscript. All authors read and approved the final manuscript.
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Dekker, J., Steen, W., Bouman, H.B. et al. Differences in acoustic detectibility of bat species hamper Environmental Impact Assessment studies. Eur J Wildl Res 68, 14 (2022). https://doi.org/10.1007/s10344-022-01562-1
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DOI: https://doi.org/10.1007/s10344-022-01562-1