Behavioral Response of Blue Whales to Active Signals.
The effects of low frequency sound on marine mammals are not well understood. Although baleen whales are known to produce low frequency sounds, very little is known about their auditory sensitivity. This analysis studied the behavior of blue whales in the vicinity of a loud, low frequency source by...
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ftdtic:ADA328274 2023-05-15T15:37:12+02:00 Behavioral Response of Blue Whales to Active Signals. Aburto, A. Rountry, D. J. Danzer, J. L. NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA 1997-06 text/html http://www.dtic.mil/docs/citations/ADA328274 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA328274 en eng http://www.dtic.mil/docs/citations/ADA328274 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Biological Oceanography Acoustics *MARINE BIOLOGICAL NOISE *AUDITORY ACUITY *WHALES SIGNAL PROCESSING REPETITION RATE TOWED ARRAYS RESPONSE(BIOLOGY) ACOUSTIC DATA LOW FREQUENCY UNDERWATER SOUND SIGNALS UNDERSEA SURVEILLANCE HIGH SENSITIVITY PE63747N WUDN903127 Text 1997 ftdtic 2016-02-19T20:40:04Z The effects of low frequency sound on marine mammals are not well understood. Although baleen whales are known to produce low frequency sounds, very little is known about their auditory sensitivity. This analysis studied the behavior of blue whales in the vicinity of a loud, low frequency source by evaluating an available data set recorded during a Low Frequency Active (LFA) experiment, the received source levels at the whales were estimated from the known source levels and a Parabolic Equation (PE) propagation model. Element level acoustic data collected with a high gain towed array during the Magellan 2 sea test conducted off the coast of California contained blue and finback whales was spectrally processed to determine the frequency content and repetition rates of their vocalizations. Subarray beam forming was used to cross fix the whale positions and track their movement relative to the active source. The effects of active source transmissions on blue whale vocalization patterns and on their movement relative to the source were analyzed. Estimated received source levels at the whales of 70 to 85 db below full transmit power did not appear to alter the vocalization patterns of the blue whales as determined by analysis of the repetition rates, frequency characteristics, and durations of the whale vocalizations before, during, and after active transmissions. Text baleen whales Blue whale Defense Technical Information Center: DTIC Technical Reports database |
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Defense Technical Information Center: DTIC Technical Reports database |
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English |
topic |
Biological Oceanography Acoustics *MARINE BIOLOGICAL NOISE *AUDITORY ACUITY *WHALES SIGNAL PROCESSING REPETITION RATE TOWED ARRAYS RESPONSE(BIOLOGY) ACOUSTIC DATA LOW FREQUENCY UNDERWATER SOUND SIGNALS UNDERSEA SURVEILLANCE HIGH SENSITIVITY PE63747N WUDN903127 |
spellingShingle |
Biological Oceanography Acoustics *MARINE BIOLOGICAL NOISE *AUDITORY ACUITY *WHALES SIGNAL PROCESSING REPETITION RATE TOWED ARRAYS RESPONSE(BIOLOGY) ACOUSTIC DATA LOW FREQUENCY UNDERWATER SOUND SIGNALS UNDERSEA SURVEILLANCE HIGH SENSITIVITY PE63747N WUDN903127 Aburto, A. Rountry, D. J. Danzer, J. L. Behavioral Response of Blue Whales to Active Signals. |
topic_facet |
Biological Oceanography Acoustics *MARINE BIOLOGICAL NOISE *AUDITORY ACUITY *WHALES SIGNAL PROCESSING REPETITION RATE TOWED ARRAYS RESPONSE(BIOLOGY) ACOUSTIC DATA LOW FREQUENCY UNDERWATER SOUND SIGNALS UNDERSEA SURVEILLANCE HIGH SENSITIVITY PE63747N WUDN903127 |
description |
The effects of low frequency sound on marine mammals are not well understood. Although baleen whales are known to produce low frequency sounds, very little is known about their auditory sensitivity. This analysis studied the behavior of blue whales in the vicinity of a loud, low frequency source by evaluating an available data set recorded during a Low Frequency Active (LFA) experiment, the received source levels at the whales were estimated from the known source levels and a Parabolic Equation (PE) propagation model. Element level acoustic data collected with a high gain towed array during the Magellan 2 sea test conducted off the coast of California contained blue and finback whales was spectrally processed to determine the frequency content and repetition rates of their vocalizations. Subarray beam forming was used to cross fix the whale positions and track their movement relative to the active source. The effects of active source transmissions on blue whale vocalization patterns and on their movement relative to the source were analyzed. Estimated received source levels at the whales of 70 to 85 db below full transmit power did not appear to alter the vocalization patterns of the blue whales as determined by analysis of the repetition rates, frequency characteristics, and durations of the whale vocalizations before, during, and after active transmissions. |
author2 |
NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA |
format |
Text |
author |
Aburto, A. Rountry, D. J. Danzer, J. L. |
author_facet |
Aburto, A. Rountry, D. J. Danzer, J. L. |
author_sort |
Aburto, A. |
title |
Behavioral Response of Blue Whales to Active Signals. |
title_short |
Behavioral Response of Blue Whales to Active Signals. |
title_full |
Behavioral Response of Blue Whales to Active Signals. |
title_fullStr |
Behavioral Response of Blue Whales to Active Signals. |
title_full_unstemmed |
Behavioral Response of Blue Whales to Active Signals. |
title_sort |
behavioral response of blue whales to active signals. |
publishDate |
1997 |
url |
http://www.dtic.mil/docs/citations/ADA328274 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA328274 |
genre |
baleen whales Blue whale |
genre_facet |
baleen whales Blue whale |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA328274 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766367664756752384 |