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Calibrated microphone array recordings reveal that a gleaning bat emits low-intensity echolocation calls even in open-space habitat

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Datum

2023

Autor:innen

de Framond, Léna
Beleyur, Thejasvi
Lewanzik, Daniel
Goerlitz, Holger R.

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Deutsche Forschungsgemeinschaft (DFG): 241711556
Deutsche Forschungsgemeinschaft (DFG): 241711556

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Journal of Experimental Biology. Company of Biologists. 2023, 226(18), jeb24580. ISSN 0022-0949. eISSN 1477-9145. Available under: doi: 10.1242/jeb.245801

Zusammenfassung

Echolocating bats use ultrasound for orientation and prey capture in darkness. Ultrasound is strongly attenuated in air. Consequently, aerial-hawking bats generally emit very intense echolocation calls to maximize detection range. However, call levels vary more than tenfold (>20 dB) between species and are tightly linked to the foraging strategy. The brown long-eared bat (Plecotus auritus) is a primarily gleaning, low-amplitude species that may occasionally hawk airborne prey. We used state-of-the-art calibrated acoustic 3D-localization and automated call analysis to measure P. auritus’ source levels. Plecotus auritus emits echolocation calls of low amplitude (92 dB rmsSPL re. 20 µPa at 10 cm) even while flying in open-space. While P. auritus thus probably benefits from delayed evasive manoeuvres of eared insects, we propose that low-amplitude echolocation did not evolve as an adaptive countermeasure, but is limited by morphological constraints.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Brown long-eared bats, Source level, Evolutionary arms race, Plecotus, Gleaning, Call amplitude

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ISO 690DE FRAMOND, Léna, Thejasvi BELEYUR, Daniel LEWANZIK, Holger R. GOERLITZ, 2023. Calibrated microphone array recordings reveal that a gleaning bat emits low-intensity echolocation calls even in open-space habitat. In: Journal of Experimental Biology. Company of Biologists. 2023, 226(18), jeb24580. ISSN 0022-0949. eISSN 1477-9145. Available under: doi: 10.1242/jeb.245801
BibTex
@article{deFramond2023Calib-69348,
  year={2023},
  doi={10.1242/jeb.245801},
  title={Calibrated microphone array recordings reveal that a gleaning bat emits low-intensity echolocation calls even in open-space habitat},
  number={18},
  volume={226},
  issn={0022-0949},
  journal={Journal of Experimental Biology},
  author={de Framond, Léna and Beleyur, Thejasvi and Lewanzik, Daniel and Goerlitz, Holger R.},
  note={Article Number: jeb24580}
}
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