Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios
Passive acoustic monitoring has been an effective tool to study cetaceans in remote regions of the Arctic. Here, we advance methods to acoustically identify the only two Arctic toothed whales, the beluga (Delphinapterus leucas) and narwhal (Monodon monoceros), using echolocation clicks. Long-term ac...
Published in: | The Journal of the Acoustical Society of America |
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2024
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ftuniaarhuspubl:oai:pure.atira.dk:publications/40b1e80e-713e-47de-a76e-c612c78bcb5d 2024-09-09T19:15:22+00:00 Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios Zahn, Marie J Ladegaard, Michael Simon, Malene Stafford, Kathleen M Sakai, Taiki Laidre, Kristin L 2024-04 https://pure.au.dk/portal/en/publications/40b1e80e-713e-47de-a76e-c612c78bcb5d https://doi.org/10.1121/10.0025460 http://www.scopus.com/inward/record.url?scp=85189769065&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/40b1e80e-713e-47de-a76e-c612c78bcb5d info:eu-repo/semantics/restrictedAccess Zahn , M J , Ladegaard , M , Simon , M , Stafford , K M , Sakai , T & Laidre , K L 2024 , ' Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios ' , The Journal of the Acoustical Society of America , vol. 155 , no. 4 , pp. 2359-2370 . https://doi.org/10.1121/10.0025460 Acoustics Animals Echolocation Whales article 2024 ftuniaarhuspubl https://doi.org/10.1121/10.0025460 2024-06-18T14:30:03Z Passive acoustic monitoring has been an effective tool to study cetaceans in remote regions of the Arctic. Here, we advance methods to acoustically identify the only two Arctic toothed whales, the beluga (Delphinapterus leucas) and narwhal (Monodon monoceros), using echolocation clicks. Long-term acoustic recordings collected from moorings in Northwest Greenland were analyzed. Beluga and narwhal echolocation signals were distinguishable using spectrograms where beluga clicks had most energy >30 kHz and narwhal clicks had a sharp lower frequency limit near 20 kHz. Changes in one-third octave levels (TOL) between two pairs of one-third octave bands were compared from over one million click spectra. Narwhal clicks had a steep increase between the 16 and 25 kHz TOL bands that was absent in beluga click spectra. Conversely, beluga clicks had a steep increase between the 25 and 40 kHz TOL bands that was absent in narwhal click spectra. Random Forest classification models built using the 16 to 25 kHz and 25 to 40 kHz TOL ratios accurately predicted the species identity of 100% of acoustic events. Our findings support the use of echolocation TOL ratios in future automated click classifiers for acoustic monitoring of Arctic toothed whales and potentially for other odontocete species. Article in Journal/Newspaper Arctic Arctic Beluga Beluga* Delphinapterus leucas Greenland Monodon monoceros narwhal* toothed whale toothed whales Aarhus University: Research Arctic Greenland The Journal of the Acoustical Society of America 155 4 2359 2370 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Acoustics Animals Echolocation Whales |
spellingShingle |
Acoustics Animals Echolocation Whales Zahn, Marie J Ladegaard, Michael Simon, Malene Stafford, Kathleen M Sakai, Taiki Laidre, Kristin L Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios |
topic_facet |
Acoustics Animals Echolocation Whales |
description |
Passive acoustic monitoring has been an effective tool to study cetaceans in remote regions of the Arctic. Here, we advance methods to acoustically identify the only two Arctic toothed whales, the beluga (Delphinapterus leucas) and narwhal (Monodon monoceros), using echolocation clicks. Long-term acoustic recordings collected from moorings in Northwest Greenland were analyzed. Beluga and narwhal echolocation signals were distinguishable using spectrograms where beluga clicks had most energy >30 kHz and narwhal clicks had a sharp lower frequency limit near 20 kHz. Changes in one-third octave levels (TOL) between two pairs of one-third octave bands were compared from over one million click spectra. Narwhal clicks had a steep increase between the 16 and 25 kHz TOL bands that was absent in beluga click spectra. Conversely, beluga clicks had a steep increase between the 25 and 40 kHz TOL bands that was absent in narwhal click spectra. Random Forest classification models built using the 16 to 25 kHz and 25 to 40 kHz TOL ratios accurately predicted the species identity of 100% of acoustic events. Our findings support the use of echolocation TOL ratios in future automated click classifiers for acoustic monitoring of Arctic toothed whales and potentially for other odontocete species. |
format |
Article in Journal/Newspaper |
author |
Zahn, Marie J Ladegaard, Michael Simon, Malene Stafford, Kathleen M Sakai, Taiki Laidre, Kristin L |
author_facet |
Zahn, Marie J Ladegaard, Michael Simon, Malene Stafford, Kathleen M Sakai, Taiki Laidre, Kristin L |
author_sort |
Zahn, Marie J |
title |
Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios |
title_short |
Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios |
title_full |
Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios |
title_fullStr |
Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios |
title_full_unstemmed |
Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios |
title_sort |
accurate species classification of arctic toothed whale echolocation clicks using one-third octave ratios |
publishDate |
2024 |
url |
https://pure.au.dk/portal/en/publications/40b1e80e-713e-47de-a76e-c612c78bcb5d https://doi.org/10.1121/10.0025460 http://www.scopus.com/inward/record.url?scp=85189769065&partnerID=8YFLogxK |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Beluga Beluga* Delphinapterus leucas Greenland Monodon monoceros narwhal* toothed whale toothed whales |
genre_facet |
Arctic Arctic Beluga Beluga* Delphinapterus leucas Greenland Monodon monoceros narwhal* toothed whale toothed whales |
op_source |
Zahn , M J , Ladegaard , M , Simon , M , Stafford , K M , Sakai , T & Laidre , K L 2024 , ' Accurate species classification of Arctic toothed whale echolocation clicks using one-third octave ratios ' , The Journal of the Acoustical Society of America , vol. 155 , no. 4 , pp. 2359-2370 . https://doi.org/10.1121/10.0025460 |
op_relation |
https://pure.au.dk/portal/en/publications/40b1e80e-713e-47de-a76e-c612c78bcb5d |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1121/10.0025460 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
155 |
container_issue |
4 |
container_start_page |
2359 |
op_container_end_page |
2370 |
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1809755431504969728 |