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 spe...

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Autores principales:	Alexandra N Constaratas, Mark A McDonald, Kimberly T Goetz, Giacomo Giorli
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/65f1291fbb0f4240a9a5e9075f0698e7
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spelling	oai:doaj.org-article:65f1291fbb0f4240a9a5e9075f0698e72021-12-02T20:15:22ZFin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring.1932-620310.1371/journal.pone.0253737https://doaj.org/article/65f1291fbb0f4240a9a5e9075f0698e72021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0253737https://doaj.org/toc/1932-6203Southern 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.Alexandra N ConstaratasMark A McDonaldKimberly T GoetzGiacomo GiorliPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0253737 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alexandra N Constaratas Mark A McDonald Kimberly T Goetz Giacomo Giorli Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring.
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.
format	article
author	Alexandra N Constaratas Mark A McDonald Kimberly T Goetz Giacomo Giorli
author_facet	Alexandra N Constaratas Mark A McDonald Kimberly T Goetz Giacomo Giorli
author_sort	Alexandra N Constaratas
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	https://doaj.org/article/65f1291fbb0f4240a9a5e9075f0698e7
work_keys_str_mv	AT alexandranconstaratas finwhaleacousticpopulationspresentinnewzealandwatersdescriptionofsongtypesoccurrenceandseasonalityusingpassiveacousticmonitoring AT markamcdonald finwhaleacousticpopulationspresentinnewzealandwatersdescriptionofsongtypesoccurrenceandseasonalityusingpassiveacousticmonitoring AT kimberlytgoetz finwhaleacousticpopulationspresentinnewzealandwatersdescriptionofsongtypesoccurrenceandseasonalityusingpassiveacousticmonitoring AT giacomogiorli finwhaleacousticpopulationspresentinnewzealandwatersdescriptionofsongtypesoccurrenceandseasonalityusingpassiveacousticmonitoring
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Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring.

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