Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground
The stereotypical stationary posture adopted by male humpback whales producing song suggests they are attempting to optimize transmission range. Over 23 days between Jan. 28 and Apr. 2 2003, we measured the sound fields of singers using divers equipped with rebreather scuba. A custom-designed "...
Main Authors: | , , , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2003
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA421803 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA421803 |
id |
ftdtic:ADA421803 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADA421803 2023-05-15T16:36:03+02:00 Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground Pack, Adam A. Potter, J. Herman, L. M. Hoffmann-Kuhnt, M. Deakos, M. H. DOLPHIN INST HONOLULU HI 2003-10 text/html http://www.dtic.mil/docs/citations/ADA421803 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA421803 en eng http://www.dtic.mil/docs/citations/ADA421803 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Biology *WHALES MAMMALS ULTRASONICS MALES HAND HELD HAWAII DIVERS ACOUSTIC FIELDS ANTHROPOMETRY NOISE(SOUND) DIGITAL CAMERAS SINGING HUMPBACK WHALE DIGITAL VIDEO CAMERAS MEGAPTERA NOVAEANGLIAER Text 2003 ftdtic 2016-02-21T07:44:24Z The stereotypical stationary posture adopted by male humpback whales producing song suggests they are attempting to optimize transmission range. Over 23 days between Jan. 28 and Apr. 2 2003, we measured the sound fields of singers using divers equipped with rebreather scuba. A custom-designed "Aquahead" system reliably located singers to within 50 m. Fifty seven singers were located using the Aquahead from distances as far away as 6.1 km in as short a time as 3 min. Divers recorded song using digital video cameras while simultaneously measuring depth and range to a singer's head using hand held ultrasonic range finders. Whale body lengths were obtained using videogrammetry. Source levels were measured up to 203 db re 1 micro Pa 1m. Up to a 16dB difference between frontal and lateral intensities (2.2 kHz) was found indicating that song was most intense at locations directly in front of the singer's rostrum. Body lengths were obtained for 18 singers. Sizes ranged from 10.64 to 13.55 m. A larger dataset is required to compare source levels and sound fields of particular units with whale body size. Text Humpback Whale Megaptera novaeangliae Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Biology *WHALES MAMMALS ULTRASONICS MALES HAND HELD HAWAII DIVERS ACOUSTIC FIELDS ANTHROPOMETRY NOISE(SOUND) DIGITAL CAMERAS SINGING HUMPBACK WHALE DIGITAL VIDEO CAMERAS MEGAPTERA NOVAEANGLIAER |
spellingShingle |
Biology *WHALES MAMMALS ULTRASONICS MALES HAND HELD HAWAII DIVERS ACOUSTIC FIELDS ANTHROPOMETRY NOISE(SOUND) DIGITAL CAMERAS SINGING HUMPBACK WHALE DIGITAL VIDEO CAMERAS MEGAPTERA NOVAEANGLIAER Pack, Adam A. Potter, J. Herman, L. M. Hoffmann-Kuhnt, M. Deakos, M. H. Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground |
topic_facet |
Biology *WHALES MAMMALS ULTRASONICS MALES HAND HELD HAWAII DIVERS ACOUSTIC FIELDS ANTHROPOMETRY NOISE(SOUND) DIGITAL CAMERAS SINGING HUMPBACK WHALE DIGITAL VIDEO CAMERAS MEGAPTERA NOVAEANGLIAER |
description |
The stereotypical stationary posture adopted by male humpback whales producing song suggests they are attempting to optimize transmission range. Over 23 days between Jan. 28 and Apr. 2 2003, we measured the sound fields of singers using divers equipped with rebreather scuba. A custom-designed "Aquahead" system reliably located singers to within 50 m. Fifty seven singers were located using the Aquahead from distances as far away as 6.1 km in as short a time as 3 min. Divers recorded song using digital video cameras while simultaneously measuring depth and range to a singer's head using hand held ultrasonic range finders. Whale body lengths were obtained using videogrammetry. Source levels were measured up to 203 db re 1 micro Pa 1m. Up to a 16dB difference between frontal and lateral intensities (2.2 kHz) was found indicating that song was most intense at locations directly in front of the singer's rostrum. Body lengths were obtained for 18 singers. Sizes ranged from 10.64 to 13.55 m. A larger dataset is required to compare source levels and sound fields of particular units with whale body size. |
author2 |
DOLPHIN INST HONOLULU HI |
format |
Text |
author |
Pack, Adam A. Potter, J. Herman, L. M. Hoffmann-Kuhnt, M. Deakos, M. H. |
author_facet |
Pack, Adam A. Potter, J. Herman, L. M. Hoffmann-Kuhnt, M. Deakos, M. H. |
author_sort |
Pack, Adam A. |
title |
Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground |
title_short |
Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground |
title_full |
Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground |
title_fullStr |
Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground |
title_full_unstemmed |
Determining Source Levels Sound Fields and Body Sizes of Singing Humpback Whales (Megaptera novaeangliae) in the Hawaiian Winter Ground |
title_sort |
determining source levels sound fields and body sizes of singing humpback whales (megaptera novaeangliae) in the hawaiian winter ground |
publishDate |
2003 |
url |
http://www.dtic.mil/docs/citations/ADA421803 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA421803 |
genre |
Humpback Whale Megaptera novaeangliae |
genre_facet |
Humpback Whale Megaptera novaeangliae |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA421803 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766026366762876928 |