Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals
One of the last pristine marine soundscapes, the Arctic, is exposed to increasing anthropogenic activities due to climate-induced decrease in sea ice coverage. In this study, we combined movement and behavioral data from animal-borne tags in a controlled sound exposure study to describe the reaction...
Published in: | Frontiers in Marine Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | https://curis.ku.dk/portal/da/publications/behavioral-response-study-on-seismic-airgun-and-vessel-exposures-in-narwhals(c95d4db3-5dc4-47f6-baae-415d503a4e2f).html https://doi.org/10.3389/fmars.2021.658173 https://curis.ku.dk/ws/files/276166790/Behavioral_Response_Study_on.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/c95d4db3-5dc4-47f6-baae-415d503a4e2f 2024-06-09T07:44:31+00:00 Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals Heide-Jorgensen, Mads Peter Blackwell, Susanna B. Tervo, Outi M. Samson, Adeline L. Garde, Eva Hansen, Rikke G. Ngo, Manh Cuong Conrad, Alexander S. Trinhammer, Per Schmidt, Hans C. Sinding, Mikkel-Holger S. Williams, Terrie M. Ditlevsen, Susanne 2021 application/pdf https://curis.ku.dk/portal/da/publications/behavioral-response-study-on-seismic-airgun-and-vessel-exposures-in-narwhals(c95d4db3-5dc4-47f6-baae-415d503a4e2f).html https://doi.org/10.3389/fmars.2021.658173 https://curis.ku.dk/ws/files/276166790/Behavioral_Response_Study_on.pdf eng eng info:eu-repo/semantics/openAccess Heide-Jorgensen , M P , Blackwell , S B , Tervo , O M , Samson , A L , Garde , E , Hansen , R G , Ngo , M C , Conrad , A S , Trinhammer , P , Schmidt , H C , Sinding , M-H S , Williams , T M & Ditlevsen , S 2021 , ' Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals ' , Frontiers in Marine Science , vol. 8 , 658173 . https://doi.org/10.3389/fmars.2021.658173 East Greenland ambient noise biologging anthropogenic noise sound exposure MARINE MAMMALS MONODON-MONOCEROS BAFFIN-BAY UNDERWATER SOUNDSCAPE MELVILLE BAY FRAM STRAIT NOISE IMPACTS CETACEANS ATLANTIC article 2021 ftcopenhagenunip https://doi.org/10.3389/fmars.2021.658173 2024-05-16T11:29:21Z One of the last pristine marine soundscapes, the Arctic, is exposed to increasing anthropogenic activities due to climate-induced decrease in sea ice coverage. In this study, we combined movement and behavioral data from animal-borne tags in a controlled sound exposure study to describe the reactions of narwhals, Monodon monoceros, to airgun pulses and ship noise. Sixteen narwhals were live captured and instrumented with satellite tags and Acousonde acoustic-behavioral recorders, and 11 of them were exposed to airgun pulses and vessel sounds. The sound exposure levels (SELs) of pulses from a small airgun (3.4 L) used in 2017 and a larger one (17.0 L) used in 2018 were measured using drifting recorders. The experiment was divided into trials with airgun and ship-noise exposure, intertrials with only ship-noise, and pre- and postexposure periods. Both trials and intertrials lasted similar to 4 h on average per individual. Depending on the location of the whales, the number of separate exposures ranged between one and eight trials or intertrials. Received pulse SELs dropped below 130 dB re 1 mu Pa-2 s by 2.5 km for the small airgun and 4-9 km for the larger airgun, and background noise levels were reached at distances of similar to 3 and 8-10.5 km, respectively, for the small and big airguns. Avoidance reactions of the whales could be detected at distances >5 km in 2017 and >11 km in 2018 when in line of sight of the seismic vessel. Meanwhile, a similar to 30% increase in horizontal travel speed could be detected up to 2 h before the seismic vessel was in line of sight. Applying line of sight as the criterion for exposure thus excludes some potential pre-response effects, and our estimates of effects must therefore be considered conservative. The whales reacted by changing their swimming speed and direction at distances between 5 and 24 km depending on topographical surroundings where the exposure occurred. The propensity of the whales to move towards the shore increased with increasing exposure (i.e., ... Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin East Greenland Fram Strait Greenland Monodon monoceros narwhal* Sea ice University of Copenhagen: Research Arctic Baffin Bay Greenland Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
East Greenland ambient noise biologging anthropogenic noise sound exposure MARINE MAMMALS MONODON-MONOCEROS BAFFIN-BAY UNDERWATER SOUNDSCAPE MELVILLE BAY FRAM STRAIT NOISE IMPACTS CETACEANS ATLANTIC |
spellingShingle |
East Greenland ambient noise biologging anthropogenic noise sound exposure MARINE MAMMALS MONODON-MONOCEROS BAFFIN-BAY UNDERWATER SOUNDSCAPE MELVILLE BAY FRAM STRAIT NOISE IMPACTS CETACEANS ATLANTIC Heide-Jorgensen, Mads Peter Blackwell, Susanna B. Tervo, Outi M. Samson, Adeline L. Garde, Eva Hansen, Rikke G. Ngo, Manh Cuong Conrad, Alexander S. Trinhammer, Per Schmidt, Hans C. Sinding, Mikkel-Holger S. Williams, Terrie M. Ditlevsen, Susanne Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals |
topic_facet |
East Greenland ambient noise biologging anthropogenic noise sound exposure MARINE MAMMALS MONODON-MONOCEROS BAFFIN-BAY UNDERWATER SOUNDSCAPE MELVILLE BAY FRAM STRAIT NOISE IMPACTS CETACEANS ATLANTIC |
description |
One of the last pristine marine soundscapes, the Arctic, is exposed to increasing anthropogenic activities due to climate-induced decrease in sea ice coverage. In this study, we combined movement and behavioral data from animal-borne tags in a controlled sound exposure study to describe the reactions of narwhals, Monodon monoceros, to airgun pulses and ship noise. Sixteen narwhals were live captured and instrumented with satellite tags and Acousonde acoustic-behavioral recorders, and 11 of them were exposed to airgun pulses and vessel sounds. The sound exposure levels (SELs) of pulses from a small airgun (3.4 L) used in 2017 and a larger one (17.0 L) used in 2018 were measured using drifting recorders. The experiment was divided into trials with airgun and ship-noise exposure, intertrials with only ship-noise, and pre- and postexposure periods. Both trials and intertrials lasted similar to 4 h on average per individual. Depending on the location of the whales, the number of separate exposures ranged between one and eight trials or intertrials. Received pulse SELs dropped below 130 dB re 1 mu Pa-2 s by 2.5 km for the small airgun and 4-9 km for the larger airgun, and background noise levels were reached at distances of similar to 3 and 8-10.5 km, respectively, for the small and big airguns. Avoidance reactions of the whales could be detected at distances >5 km in 2017 and >11 km in 2018 when in line of sight of the seismic vessel. Meanwhile, a similar to 30% increase in horizontal travel speed could be detected up to 2 h before the seismic vessel was in line of sight. Applying line of sight as the criterion for exposure thus excludes some potential pre-response effects, and our estimates of effects must therefore be considered conservative. The whales reacted by changing their swimming speed and direction at distances between 5 and 24 km depending on topographical surroundings where the exposure occurred. The propensity of the whales to move towards the shore increased with increasing exposure (i.e., ... |
format |
Article in Journal/Newspaper |
author |
Heide-Jorgensen, Mads Peter Blackwell, Susanna B. Tervo, Outi M. Samson, Adeline L. Garde, Eva Hansen, Rikke G. Ngo, Manh Cuong Conrad, Alexander S. Trinhammer, Per Schmidt, Hans C. Sinding, Mikkel-Holger S. Williams, Terrie M. Ditlevsen, Susanne |
author_facet |
Heide-Jorgensen, Mads Peter Blackwell, Susanna B. Tervo, Outi M. Samson, Adeline L. Garde, Eva Hansen, Rikke G. Ngo, Manh Cuong Conrad, Alexander S. Trinhammer, Per Schmidt, Hans C. Sinding, Mikkel-Holger S. Williams, Terrie M. Ditlevsen, Susanne |
author_sort |
Heide-Jorgensen, Mads Peter |
title |
Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals |
title_short |
Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals |
title_full |
Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals |
title_fullStr |
Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals |
title_full_unstemmed |
Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals |
title_sort |
behavioral response study on seismic airgun and vessel exposures in narwhals |
publishDate |
2021 |
url |
https://curis.ku.dk/portal/da/publications/behavioral-response-study-on-seismic-airgun-and-vessel-exposures-in-narwhals(c95d4db3-5dc4-47f6-baae-415d503a4e2f).html https://doi.org/10.3389/fmars.2021.658173 https://curis.ku.dk/ws/files/276166790/Behavioral_Response_Study_on.pdf |
geographic |
Arctic Baffin Bay Greenland |
geographic_facet |
Arctic Baffin Bay Greenland |
genre |
Arctic Baffin Bay Baffin Bay Baffin East Greenland Fram Strait Greenland Monodon monoceros narwhal* Sea ice |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin East Greenland Fram Strait Greenland Monodon monoceros narwhal* Sea ice |
op_source |
Heide-Jorgensen , M P , Blackwell , S B , Tervo , O M , Samson , A L , Garde , E , Hansen , R G , Ngo , M C , Conrad , A S , Trinhammer , P , Schmidt , H C , Sinding , M-H S , Williams , T M & Ditlevsen , S 2021 , ' Behavioral Response Study on Seismic Airgun and Vessel Exposures in Narwhals ' , Frontiers in Marine Science , vol. 8 , 658173 . https://doi.org/10.3389/fmars.2021.658173 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2021.658173 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1801373256233517056 |