Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring
Southern fin whales ( Balaenoptera physalus ) are known to migrate from the Antarctic to mid-latitudes during winter for breeding, but the occurrence and distribution of this species is not well known in the waters around New Zealand. The ‘doublet’ calls are one of the main calls emitted specificall...
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crplos:10.1371/journal.pone.0253737 2024-09-09T19:06:30+00:00 Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring Constaratas, Alexandra N. McDonald, Mark A. Goetz, Kimberly T. Giorli, Giacomo Halliday, William David OMV New Zealand Ltd Chevron New Zealand Holdings LLC Marlborough District Council NIWA Coasts and Oceans Programme 4 NIWA Coasts and Oceans Programme 4 2021 http://dx.doi.org/10.1371/journal.pone.0253737 https://dx.plos.org/10.1371/journal.pone.0253737 en eng Public Library of Science (PLoS) https://creativecommons.org/publicdomain/zero/1.0/ PLOS ONE volume 16, issue 7, page e0253737 ISSN 1932-6203 journal-article 2021 crplos https://doi.org/10.1371/journal.pone.0253737 2024-07-02T04:08:11Z Southern fin whales ( Balaenoptera physalus ) are known to migrate from the Antarctic to mid-latitudes during winter for breeding, but the occurrence and distribution of this species is not well known in the waters around New Zealand. The ‘doublet’ calls are one of the main calls emitted specifically by fin whales and repeated in a regular pattern, which make the acoustic detection of these calls relevant to detect the presence of fin whales. Using a signal processing algorithm to detect ‘doublet’ calls emitted by fin whales, we studied the occurrence, characteristics and seasonality of these ‘doublet’ calls in two regions around New Zealand; Cook Strait in 2016/2017 and offshore Gisborne in 2014/2015. The call detection procedure consisted of binarization of the spectrogram and a cross-correlation between the binarized spectrogram and a template of binarized ‘doublet’ calls spectrogram. A binarization threshold for the data spectrograms and a cross correlation threshold were then determined through multiple trials on a training dataset and a Receiver Operating Characteristics (ROC) curve. Fin whale ‘doublet’ calls occurred on the east side of New Zealand’s Cook Strait during austral winter, specifically in June 2017 and offshore Gisborne in June-August 2014. No ‘doublet’ calls were detected on the west side of Cook Strait. The ‘doublet’ calls’ Inter-Note Interval (INI) was similar in both datasets. However, there was a difference in alternation of the mean frequency for both HF components of ‘doublet’ calls in Cook Strait and Gisborne. As the song types were compared with those previously described in the literature, our findings suggest that some fin whales wintering in New Zealand waters may be part of a broader ‘acoustic population’ whose range extends west to southern Australia and south to Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Balaenoptera physalus Fin whale PLOS Antarctic Austral New Zealand The Antarctic PLOS ONE 16 7 e0253737 |
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language |
English |
description |
Southern fin whales ( Balaenoptera physalus ) are known to migrate from the Antarctic to mid-latitudes during winter for breeding, but the occurrence and distribution of this species is not well known in the waters around New Zealand. The ‘doublet’ calls are one of the main calls emitted specifically by fin whales and repeated in a regular pattern, which make the acoustic detection of these calls relevant to detect the presence of fin whales. Using a signal processing algorithm to detect ‘doublet’ calls emitted by fin whales, we studied the occurrence, characteristics and seasonality of these ‘doublet’ calls in two regions around New Zealand; Cook Strait in 2016/2017 and offshore Gisborne in 2014/2015. The call detection procedure consisted of binarization of the spectrogram and a cross-correlation between the binarized spectrogram and a template of binarized ‘doublet’ calls spectrogram. A binarization threshold for the data spectrograms and a cross correlation threshold were then determined through multiple trials on a training dataset and a Receiver Operating Characteristics (ROC) curve. Fin whale ‘doublet’ calls occurred on the east side of New Zealand’s Cook Strait during austral winter, specifically in June 2017 and offshore Gisborne in June-August 2014. No ‘doublet’ calls were detected on the west side of Cook Strait. The ‘doublet’ calls’ Inter-Note Interval (INI) was similar in both datasets. However, there was a difference in alternation of the mean frequency for both HF components of ‘doublet’ calls in Cook Strait and Gisborne. As the song types were compared with those previously described in the literature, our findings suggest that some fin whales wintering in New Zealand waters may be part of a broader ‘acoustic population’ whose range extends west to southern Australia and south to Antarctica. |
author2 |
Halliday, William David OMV New Zealand Ltd Chevron New Zealand Holdings LLC Marlborough District Council NIWA Coasts and Oceans Programme 4 NIWA Coasts and Oceans Programme 4 |
format |
Article in Journal/Newspaper |
author |
Constaratas, Alexandra N. McDonald, Mark A. Goetz, Kimberly T. Giorli, Giacomo |
spellingShingle |
Constaratas, Alexandra N. McDonald, Mark A. Goetz, Kimberly T. Giorli, Giacomo Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring |
author_facet |
Constaratas, Alexandra N. McDonald, Mark A. Goetz, Kimberly T. Giorli, Giacomo |
author_sort |
Constaratas, Alexandra N. |
title |
Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring |
title_short |
Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring |
title_full |
Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring |
title_fullStr |
Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring |
title_full_unstemmed |
Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring |
title_sort |
fin whale acoustic populations present in new zealand waters: description of song types, occurrence and seasonality using passive acoustic monitoring |
publisher |
Public Library of Science (PLoS) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1371/journal.pone.0253737 https://dx.plos.org/10.1371/journal.pone.0253737 |
geographic |
Antarctic Austral New Zealand The Antarctic |
geographic_facet |
Antarctic Austral New Zealand The Antarctic |
genre |
Antarc* Antarctic Antarctica Balaenoptera physalus Fin whale |
genre_facet |
Antarc* Antarctic Antarctica Balaenoptera physalus Fin whale |
op_source |
PLOS ONE volume 16, issue 7, page e0253737 ISSN 1932-6203 |
op_rights |
https://creativecommons.org/publicdomain/zero/1.0/ |
op_doi |
https://doi.org/10.1371/journal.pone.0253737 |
container_title |
PLOS ONE |
container_volume |
16 |
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7 |
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e0253737 |
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1809820556658212864 |