Echolocation behaviour of Megaderma lyra during typical orientation situations and while hunting aerial prey: a field study
Echolocation behaviour of Megaderma lyra during typical orientation situations and while hunting aerial prey: a field study
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天琴座巨皮霉在典型定向情况下和狩猎空中猎物时的回声定位行为:实地研究
DOI:
10.1007/s00359-010-0552-2
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
Grunwald
中科院分区:
文献类型:
--
作者:
Schmidt;Grunwald
Bats modify the structure and emission pattern of their calls to cope with the functional constraints of a given echolocation situation. As a consequence, the flexibility in sonar call use affects the potential niche use of a species. The present paper addresses call use inMegaderma lyra, a species with a short, broadband multiharmonic basic call, in typical orientation situations, when emerging from and re-entering a day roost, in cruising flight and when passing through vegetation, and during the pursuit of tethered, flying insects. While call duration and emission rate were adapted to the four orientation situations, call spectral composition was similar in these situations, except that bats emitted calls containing more harmonics when re-entering the roost. These moderate call modifications may be accounted for by the observation thatM. lyrastayed close to landscape elements even in open habitats. AlthoughM. lyrais a typical gleaner, all tested bats approached flying insects, guided by sonar calls of significantly decreasing duration and pulse interval, and of increasing sweep rate. Before capture, peak frequency was lowered from call to call. The spontaneous approaches towards flying insects with systematic changes in call pattern suggest regular aerial hunting in this species.
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影响因子:
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2000
期刊:
Journal of Comparative Physiology A
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