| Autor: |
DeRuiter SL; Centre for Research into Ecological and Environmental Modelling, Scottish Oceans Institute, University of St Andrews, , St Andrews, UK., Southall BL, Calambokidis J, Zimmer WM, Sadykova D, Falcone EA, Friedlaender AS, Joseph JE, Moretti D, Schorr GS, Thomas L, Tyack PL |
| Jazyk: |
angličtina |
| Zdroj: |
Biology letters [Biol Lett] 2013 Jul 03; Vol. 9 (4), pp. 20130223. Date of Electronic Publication: 2013 Jul 03 (Print Publication: 2013). |
| DOI: |
10.1098/rsbl.2013.0223 |
| Abstrakt: |
Most marine mammal- strandings coincident with naval sonar exercises have involved Cuvier's beaked whales (Ziphius cavirostris). We recorded animal movement and acoustic data on two tagged Ziphius and obtained the first direct measurements of behavioural responses of this species to mid-frequency active (MFA) sonar signals. Each recording included a 30-min playback (one 1.6-s simulated MFA sonar signal repeated every 25 s); one whale was also incidentally exposed to MFA sonar from distant naval exercises. Whales responded strongly to playbacks at low received levels (RLs; 89-127 dB re 1 µPa): after ceasing normal fluking and echolocation, they swam rapidly, silently away, extending both dive duration and subsequent non-foraging interval. Distant sonar exercises (78-106 dB re 1 µPa) did not elicit such responses, suggesting that context may moderate reactions. The observed responses to playback occurred at RLs well below current regulatory thresholds; equivalent responses to operational sonars could elevate stranding risk and reduce foraging efficiency. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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