期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 211, 期 19, 页码 3174-3180出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jeb.022863
关键词
environmental noise; anthropogenic noise; traffic noise; foraging; road ecology; Myotis myotis; gleaning bats; passive listening; echolocation; masking
类别
资金
- German Federal Ministry of Transport, Building and Urban Affairs [FE 02.256/2004/LR]
- Max Planck Society. Ministry
Ambient noise influences the availability and use of acoustic information in animals in many ways. While much research has focused on the effects of noise on acoustic communication, here, we present the first study concerned with anthropogenic noise and foraging behaviour. We chose the greater mouse-eared bat (Myotis myotis) as a model species because it represents the especially vulnerable group of gleaning bats that rely on listening for prey rustling sounds to find food (i. e.. 'passive listening'). In a choice experiment with two foraging compartments, we investigated the influence of background noise on foraging effort and foraging success. We tested the hypotheses that: (1) bats will avoid foraging areas with particularly loud background noise; and (2) the frequency -time structure of the noise will determine, in part, the degree to which it deters bats. We found a clear effect of the type of noise on the allocation of foraging effort to the compartments and on the distribution of prey capture events. When playing back silence, the bats made equal use of and were equally successful in both compartments. In the other three treatments (where a non-silent sound was played back), the bats avoided the playback compartment. The degree to which the background noise deterred bats from the compartment increased from traffic noise to vegetation movement noise to broadband computer-generated noise. Vegetation noise, set 12 dB below the traffic noise amplitude, had a larger repellent effect; presumably because of its acoustic similarity with prey sounds. Our experimental data suggest that foraging areas very close to highways and presumably also to other sources of intense, broadband noise are degraded in their suitability as foraging areas for such. passive listening' bats.
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