Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04
ABSTRACT. Since the mid-1990s, gray whales (Eschrichtius robustus) have been reported with increasing frequency near Barrow, Alaska, during summer and autumn months. In collaboration with a broad-scale oceanographic study, three autonomous acoustic recorders were moored northeast of Barrow in Octobe...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.605.9343 2023-05-15T14:19:44+02:00 Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04 K. M. Stafford S. E. Moore M. Spillane S. Wiggins The Pennsylvania State University CiteSeerX Archives 2006 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.9343 http://pubs.aina.ucalgary.ca/arctic/Arctic60-2-167.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.9343 http://pubs.aina.ucalgary.ca/arctic/Arctic60-2-167.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/Arctic60-2-167.pdf text 2006 ftciteseerx 2016-01-08T14:15:28Z ABSTRACT. Since the mid-1990s, gray whales (Eschrichtius robustus) have been reported with increasing frequency near Barrow, Alaska, during summer and autumn months. In collaboration with a broad-scale oceanographic study, three autonomous acoustic recorders were moored northeast of Barrow in October 2003 to provide capability for year-round detection of calls. Two recorders were recovered in September 2004, one from the continental slope (water depth = 316 m) and one from near the base of the slope (water depth = 1258 m). The shallow instrument recorded for roughly 3 months (87 days), and the deeper instrument for roughly 7.3 months (222 days). Gray whale calls were recorded on both instruments throughout their periods of operation. The calling rate at the shallower instrument was higher than at the deeper recorder, but surprisingly, the deeper instrument detected calls throughout the 2003 – 04 winter, though the calling rate diminished as winter progressed. Low-frequency N1/S1 pulses, the most common of the calls produced by gray whales, were recorded from deployment through December 2003 on the shallower of the two instruments and from deployment through May 2004 on the deeper instrument. Because this is the first-ever winter-long acoustic study, we cannot be certain that gray whales have not overwintered in the Beaufort Sea in the past. However, a combination of increasing population size and habitat alteration associated with sea ice reduction and warming in the Alaskan Arctic may be responsible for the extra-seasonal gray whale occurrence near Barrow. Key words: gray whale, Eschrichtius robustus, acoustics, Barrow RÉSUMÉ. Depuis le milieu des années 1990, des baleines grises (Eschrichtius robustus) ont été signalées de plus en plus souvent Text Arctic Arctic Barrow Beaufort Sea Sea ice Alaska Unknown Arctic |
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English |
description |
ABSTRACT. Since the mid-1990s, gray whales (Eschrichtius robustus) have been reported with increasing frequency near Barrow, Alaska, during summer and autumn months. In collaboration with a broad-scale oceanographic study, three autonomous acoustic recorders were moored northeast of Barrow in October 2003 to provide capability for year-round detection of calls. Two recorders were recovered in September 2004, one from the continental slope (water depth = 316 m) and one from near the base of the slope (water depth = 1258 m). The shallow instrument recorded for roughly 3 months (87 days), and the deeper instrument for roughly 7.3 months (222 days). Gray whale calls were recorded on both instruments throughout their periods of operation. The calling rate at the shallower instrument was higher than at the deeper recorder, but surprisingly, the deeper instrument detected calls throughout the 2003 – 04 winter, though the calling rate diminished as winter progressed. Low-frequency N1/S1 pulses, the most common of the calls produced by gray whales, were recorded from deployment through December 2003 on the shallower of the two instruments and from deployment through May 2004 on the deeper instrument. Because this is the first-ever winter-long acoustic study, we cannot be certain that gray whales have not overwintered in the Beaufort Sea in the past. However, a combination of increasing population size and habitat alteration associated with sea ice reduction and warming in the Alaskan Arctic may be responsible for the extra-seasonal gray whale occurrence near Barrow. Key words: gray whale, Eschrichtius robustus, acoustics, Barrow RÉSUMÉ. Depuis le milieu des années 1990, des baleines grises (Eschrichtius robustus) ont été signalées de plus en plus souvent |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
K. M. Stafford S. E. Moore M. Spillane S. Wiggins |
spellingShingle |
K. M. Stafford S. E. Moore M. Spillane S. Wiggins Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04 |
author_facet |
K. M. Stafford S. E. Moore M. Spillane S. Wiggins |
author_sort |
K. M. Stafford |
title |
Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04 |
title_short |
Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04 |
title_full |
Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04 |
title_fullStr |
Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04 |
title_full_unstemmed |
Gray Whale Calls Recorded near Barrow, Alaska, throughout the Winter of 2003–04 |
title_sort |
gray whale calls recorded near barrow, alaska, throughout the winter of 2003–04 |
publishDate |
2006 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.9343 http://pubs.aina.ucalgary.ca/arctic/Arctic60-2-167.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Barrow Beaufort Sea Sea ice Alaska |
genre_facet |
Arctic Arctic Barrow Beaufort Sea Sea ice Alaska |
op_source |
http://pubs.aina.ucalgary.ca/arctic/Arctic60-2-167.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.9343 http://pubs.aina.ucalgary.ca/arctic/Arctic60-2-167.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766291482474446848 |