Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea
Abstract This study assesses effects of airgun sounds on bowhead calling behavior during the autumn migration. In August–October 2007, 35 directional acoustic recorders (DASARs) were deployed at five sites in the Alaskan Beaufort Sea. Location estimates were obtained for >137,500 individual calls...
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crwiley:10.1111/mms.12001 2024-09-15T17:58:24+00:00 Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea Blackwell, Susanna B. Nations, Christopher S. McDonald, Trent L. Greene, Charles R. Thode, Aaron M. Guerra, Melania Michael Macrander, A. 2013 http://dx.doi.org/10.1111/mms.12001 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12001 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12001 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 29, issue 4 ISSN 0824-0469 1748-7692 journal-article 2013 crwiley https://doi.org/10.1111/mms.12001 2024-08-01T04:19:32Z Abstract This study assesses effects of airgun sounds on bowhead calling behavior during the autumn migration. In August–October 2007, 35 directional acoustic recorders (DASARs) were deployed at five sites in the Alaskan Beaufort Sea. Location estimates were obtained for >137,500 individual calls; a subsample of locations with high detection probability was used in the analyses. Call localization rates (CLRs) were compared before, during, and after periods of airgun use between sites near seismic activities (median distance 41–45 km) and sites relatively distant from seismic activities (median distance >104 km). At the onset of airgun use, CLRs dropped significantly at sites near the airguns, where median received levels from airgun pulses (SPL) were 116–129 dB re 1 μPa (10–450 Hz). CLRs remained unchanged at sites distant from the airguns, where median received levels were 99–108 dB re 1 μPa. This drop could result from a cessation of calling, deflection of whales around seismic activities, or both combined, but call locations alone were insufficient to differentiate between these possibilities. Reverberation from airgun pulses could have masked a small number of calls near the airguns, but even if masking did take place, the analysis results remain unchanged. Article in Journal/Newspaper Beaufort Sea bowhead whale Wiley Online Library Marine Mammal Science n/a n/a |
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English |
description |
Abstract This study assesses effects of airgun sounds on bowhead calling behavior during the autumn migration. In August–October 2007, 35 directional acoustic recorders (DASARs) were deployed at five sites in the Alaskan Beaufort Sea. Location estimates were obtained for >137,500 individual calls; a subsample of locations with high detection probability was used in the analyses. Call localization rates (CLRs) were compared before, during, and after periods of airgun use between sites near seismic activities (median distance 41–45 km) and sites relatively distant from seismic activities (median distance >104 km). At the onset of airgun use, CLRs dropped significantly at sites near the airguns, where median received levels from airgun pulses (SPL) were 116–129 dB re 1 μPa (10–450 Hz). CLRs remained unchanged at sites distant from the airguns, where median received levels were 99–108 dB re 1 μPa. This drop could result from a cessation of calling, deflection of whales around seismic activities, or both combined, but call locations alone were insufficient to differentiate between these possibilities. Reverberation from airgun pulses could have masked a small number of calls near the airguns, but even if masking did take place, the analysis results remain unchanged. |
format |
Article in Journal/Newspaper |
author |
Blackwell, Susanna B. Nations, Christopher S. McDonald, Trent L. Greene, Charles R. Thode, Aaron M. Guerra, Melania Michael Macrander, A. |
spellingShingle |
Blackwell, Susanna B. Nations, Christopher S. McDonald, Trent L. Greene, Charles R. Thode, Aaron M. Guerra, Melania Michael Macrander, A. Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea |
author_facet |
Blackwell, Susanna B. Nations, Christopher S. McDonald, Trent L. Greene, Charles R. Thode, Aaron M. Guerra, Melania Michael Macrander, A. |
author_sort |
Blackwell, Susanna B. |
title |
Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea |
title_short |
Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea |
title_full |
Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea |
title_fullStr |
Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea |
title_full_unstemmed |
Effects of airgun sounds on bowhead whale calling rates in the Alaskan Beaufort Sea |
title_sort |
effects of airgun sounds on bowhead whale calling rates in the alaskan beaufort sea |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/mms.12001 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12001 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12001 |
genre |
Beaufort Sea bowhead whale |
genre_facet |
Beaufort Sea bowhead whale |
op_source |
Marine Mammal Science volume 29, issue 4 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mms.12001 |
container_title |
Marine Mammal Science |
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n/a |
_version_ |
1810434811130544128 |