Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales
To learn more about the occurrence and behaviour of a recently discovered population of blue whales, passive acoustic data were collected between January 2012 and April 2013 in the Chiloense ecoregion of southern Chile. Automatic detectors and manual auditing were used to detect blue whale songs (SE...
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Online Access: | https://doi.org/10.3390/jmse10030316 |
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ftmdpi:oai:mdpi.com:/2077-1312/10/3/316/ 2023-08-20T04:05:25+02:00 Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales Laura Redaelli Sari Mangia Woods Rafaela Landea Laela Sayigh agris 2022-02-23 application/pdf https://doi.org/10.3390/jmse10030316 EN eng Multidisciplinary Digital Publishing Institute Marine Biology https://dx.doi.org/10.3390/jmse10030316 https://creativecommons.org/licenses/by/4.0/ Journal of Marine Science and Engineering; Volume 10; Issue 3; Pages: 316 Chilean blue whales marine bioacoustics Balaenoptera musculus chilensis Chile D calls SEP calls diel patterns seasonal trends marine conservation Text 2022 ftmdpi https://doi.org/10.3390/jmse10030316 2023-08-01T04:15:35Z To learn more about the occurrence and behaviour of a recently discovered population of blue whales, passive acoustic data were collected between January 2012 and April 2013 in the Chiloense ecoregion of southern Chile. Automatic detectors and manual auditing were used to detect blue whale songs (SEP calls) and D calls, which were then analysed to gain insights into temporal calling patterns. We found that D call rates were extremely low during winter (June–August) but gradually increased in spring and summer, decreasing again later during fall. SEP calls were absent for most winter and spring months (July–November) but increased in summer and fall, peaking between March and April. Thus, our results support previous studies documenting the austral summer residency of blue whales in this region, while suggesting that some individuals stay longer, highlighting the importance of this area as a blue whale habitat. We also investigated the daily occurrence of each call type and found that D calls occurred more frequently during dusk and night hours compared to dawn and day periods, whereas SEP calls did not show any significant diel patterns. Overall, these findings help to understand the occurrence and behaviour of endangered Chilean blue whales, enhancing our ability to develop conservation strategies in this important Southern Hemisphere habitat. Text Balaenoptera musculus Blue whale MDPI Open Access Publishing Austral Journal of Marine Science and Engineering 10 3 316 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Chilean blue whales marine bioacoustics Balaenoptera musculus chilensis Chile D calls SEP calls diel patterns seasonal trends marine conservation |
spellingShingle |
Chilean blue whales marine bioacoustics Balaenoptera musculus chilensis Chile D calls SEP calls diel patterns seasonal trends marine conservation Laura Redaelli Sari Mangia Woods Rafaela Landea Laela Sayigh Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales |
topic_facet |
Chilean blue whales marine bioacoustics Balaenoptera musculus chilensis Chile D calls SEP calls diel patterns seasonal trends marine conservation |
description |
To learn more about the occurrence and behaviour of a recently discovered population of blue whales, passive acoustic data were collected between January 2012 and April 2013 in the Chiloense ecoregion of southern Chile. Automatic detectors and manual auditing were used to detect blue whale songs (SEP calls) and D calls, which were then analysed to gain insights into temporal calling patterns. We found that D call rates were extremely low during winter (June–August) but gradually increased in spring and summer, decreasing again later during fall. SEP calls were absent for most winter and spring months (July–November) but increased in summer and fall, peaking between March and April. Thus, our results support previous studies documenting the austral summer residency of blue whales in this region, while suggesting that some individuals stay longer, highlighting the importance of this area as a blue whale habitat. We also investigated the daily occurrence of each call type and found that D calls occurred more frequently during dusk and night hours compared to dawn and day periods, whereas SEP calls did not show any significant diel patterns. Overall, these findings help to understand the occurrence and behaviour of endangered Chilean blue whales, enhancing our ability to develop conservation strategies in this important Southern Hemisphere habitat. |
format |
Text |
author |
Laura Redaelli Sari Mangia Woods Rafaela Landea Laela Sayigh |
author_facet |
Laura Redaelli Sari Mangia Woods Rafaela Landea Laela Sayigh |
author_sort |
Laura Redaelli |
title |
Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales |
title_short |
Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales |
title_full |
Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales |
title_fullStr |
Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales |
title_full_unstemmed |
Seasonal Trends and Diel Patterns of Downsweep and SEP Calls in Chilean Blue Whales |
title_sort |
seasonal trends and diel patterns of downsweep and sep calls in chilean blue whales |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/jmse10030316 |
op_coverage |
agris |
geographic |
Austral |
geographic_facet |
Austral |
genre |
Balaenoptera musculus Blue whale |
genre_facet |
Balaenoptera musculus Blue whale |
op_source |
Journal of Marine Science and Engineering; Volume 10; Issue 3; Pages: 316 |
op_relation |
Marine Biology https://dx.doi.org/10.3390/jmse10030316 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/jmse10030316 |
container_title |
Journal of Marine Science and Engineering |
container_volume |
10 |
container_issue |
3 |
container_start_page |
316 |
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1774715939512647680 |