Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica
Descriptions of seasonal occurrence and behaviour of Antarctic blue and fin whales in the Southern Ocean are of pivotal importance for the effective conservation and management of these endangered species. We used an autonomous acoustic recorder to collect bioacoustic data from January through Septe...
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ftdoajarticles:oai:doaj.org/article:6e500e81a00141f3aa7448e34892a168 2023-05-15T13:34:26+02:00 Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica Shabangu, FW Andrew, RK Yemane, D Findlay, KP 2020-09-01T00:00:00Z https://doi.org/10.3354/esr01050 https://doaj.org/article/6e500e81a00141f3aa7448e34892a168 EN eng Inter-Research https://www.int-res.com/abstracts/esr/v43/p21-37/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01050 https://doaj.org/article/6e500e81a00141f3aa7448e34892a168 Endangered Species Research, Vol 43, Pp 21-37 (2020) Zoology QL1-991 Botany QK1-989 article 2020 ftdoajarticles https://doi.org/10.3354/esr01050 2022-12-31T15:25:57Z Descriptions of seasonal occurrence and behaviour of Antarctic blue and fin whales in the Southern Ocean are of pivotal importance for the effective conservation and management of these endangered species. We used an autonomous acoustic recorder to collect bioacoustic data from January through September 2014 to describe the seasonal occurrence, behaviour and detection ranges of Antarctic blue and fin whale calls off the Maud Rise, Antarctica. From 2479 h of recordings, we detected D- and Z-calls plus the 27 Hz chorus of blue whales, the 20 and 99 Hz pulses of fin whales and the 18-28 Hz chorus of blue and fin whales. Blue whale calls were detected throughout the hydrophone deployment period with a peak occurrence in February, indicating continuous presence of whales in a broad Southern Ocean area (given the modelled detection ranges). Fin whale calls were detected from January through July when sea ice was present on the latter dates. No temporal segregation in peaks of diel calling rates of blue and fin whales was observed in autumn, but a clear temporal segregation was apparent in summer. Acoustic propagation models suggest that blue and fin whale calls can be heard as far as 1700 km from the hydrophone position in spring. Random forest models ranked month of the year as the most important predictor of call occurrence and call rates (i.e. behaviour) for these whales. Our work highlights areas around the Maud Rise as important habitats for blue and fin whales in the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctica Blue whale Fin whale Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Endangered Species Research 43 21 37 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Zoology QL1-991 Botany QK1-989 |
spellingShingle |
Zoology QL1-991 Botany QK1-989 Shabangu, FW Andrew, RK Yemane, D Findlay, KP Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica |
topic_facet |
Zoology QL1-991 Botany QK1-989 |
description |
Descriptions of seasonal occurrence and behaviour of Antarctic blue and fin whales in the Southern Ocean are of pivotal importance for the effective conservation and management of these endangered species. We used an autonomous acoustic recorder to collect bioacoustic data from January through September 2014 to describe the seasonal occurrence, behaviour and detection ranges of Antarctic blue and fin whale calls off the Maud Rise, Antarctica. From 2479 h of recordings, we detected D- and Z-calls plus the 27 Hz chorus of blue whales, the 20 and 99 Hz pulses of fin whales and the 18-28 Hz chorus of blue and fin whales. Blue whale calls were detected throughout the hydrophone deployment period with a peak occurrence in February, indicating continuous presence of whales in a broad Southern Ocean area (given the modelled detection ranges). Fin whale calls were detected from January through July when sea ice was present on the latter dates. No temporal segregation in peaks of diel calling rates of blue and fin whales was observed in autumn, but a clear temporal segregation was apparent in summer. Acoustic propagation models suggest that blue and fin whale calls can be heard as far as 1700 km from the hydrophone position in spring. Random forest models ranked month of the year as the most important predictor of call occurrence and call rates (i.e. behaviour) for these whales. Our work highlights areas around the Maud Rise as important habitats for blue and fin whales in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Shabangu, FW Andrew, RK Yemane, D Findlay, KP |
author_facet |
Shabangu, FW Andrew, RK Yemane, D Findlay, KP |
author_sort |
Shabangu, FW |
title |
Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica |
title_short |
Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica |
title_full |
Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica |
title_fullStr |
Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica |
title_full_unstemmed |
Acoustic seasonality, behaviour and detection ranges of Antarctic blue and fin whales under different sea ice conditions off Antarctica |
title_sort |
acoustic seasonality, behaviour and detection ranges of antarctic blue and fin whales under different sea ice conditions off antarctica |
publisher |
Inter-Research |
publishDate |
2020 |
url |
https://doi.org/10.3354/esr01050 https://doaj.org/article/6e500e81a00141f3aa7448e34892a168 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) |
geographic |
Antarctic Southern Ocean Maud Rise |
geographic_facet |
Antarctic Southern Ocean Maud Rise |
genre |
Antarc* Antarctic Antarctica Blue whale Fin whale Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Blue whale Fin whale Sea ice Southern Ocean |
op_source |
Endangered Species Research, Vol 43, Pp 21-37 (2020) |
op_relation |
https://www.int-res.com/abstracts/esr/v43/p21-37/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01050 https://doaj.org/article/6e500e81a00141f3aa7448e34892a168 |
op_doi |
https://doi.org/10.3354/esr01050 |
container_title |
Endangered Species Research |
container_volume |
43 |
container_start_page |
21 |
op_container_end_page |
37 |
_version_ |
1766052648176320512 |