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Found 2 translations.
| Name | Current message text |
|---|---|
| h English (en) | Beluga biosonar is flexible rather than mechanically fixed. In a controlled study of one trained male, ambient noise in Kaneohe Bay was 12–17 dB higher than in San Diego Bay. In the quieter environment, the whale's echolocation signals peaked mainly at 40–60 kHz with bandwidths of 15–25 kHz. In the noisier environment, peaks shifted to 100–120 kHz, bandwidths widened to 20–40 kHz, and signal intensity rose by as much as 18 dB. The authors interpreted this as adaptation of the emitted signal to the acoustic environment.<ref name="adaptation">Au, W. W. L.; Carder, D. A.; Penner, R. H.; and Scronce, B. L. (1985). [https://doi.org/10.1121/1.392341 Demonstration of adaptation in beluga whale echolocation signals]. ''The Journal of the Acoustical Society of America'' 77(2): 726–730.</ref> The result is an instructive case study, not a species-wide rule derived from a large sample. |
| h Japanese (ja) | シロイルカのバイオソナーは機械的に固定されたものではなく、柔軟に変化する。訓練された雄1頭を対象とした比較実験では、カネオヘ湾の環境騒音はサンディエゴ湾より12〜17 dB高かった。静かな環境では、反響定位信号のピークは主に40〜60 kHz、帯域幅は15〜25 kHzだった。騒音の大きい環境では、ピークが100〜120 kHzへ移り、帯域幅は20〜40 kHzへ広がり、信号強度は最大18 dB上昇した。著者らはこれを、放射信号を音響環境に適応させたものと解釈した。<ref name="adaptation">Au, W. W. L.; Carder, D. A.; Penner, R. H.; and Scronce, B. L. (1985). [https://doi.org/10.1121/1.392341 Demonstration of adaptation in beluga whale echolocation signals]. ''The Journal of the Acoustical Society of America'' 77(2): 726–730.</ref> これは示唆に富む事例研究だが、大標本から導かれた種全体の規則ではない。 |