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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2022
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Online Access: | https://doi.org/10.3390/jmse10030316 https://doaj.org/article/2d2266ef62a34762a100188a7a2a73b0 |
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ftdoajarticles:oai:doaj.org/article:2d2266ef62a34762a100188a7a2a73b0 2023-05-15T15:36:24+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 2022-02-01T00:00:00Z https://doi.org/10.3390/jmse10030316 https://doaj.org/article/2d2266ef62a34762a100188a7a2a73b0 EN eng MDPI AG https://www.mdpi.com/2077-1312/10/3/316 https://doaj.org/toc/2077-1312 doi:10.3390/jmse10030316 2077-1312 https://doaj.org/article/2d2266ef62a34762a100188a7a2a73b0 Journal of Marine Science and Engineering, Vol 10, Iss 316, p 316 (2022) Chilean blue whales marine bioacoustics Balaenoptera musculus chilensis Chile D calls SEP calls Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 article 2022 ftdoajarticles https://doi.org/10.3390/jmse10030316 2022-12-31T03:36:16Z 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. Article in Journal/Newspaper Balaenoptera musculus Blue whale Directory of Open Access Journals: DOAJ Articles Austral Journal of Marine Science and Engineering 10 3 316 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Chilean blue whales marine bioacoustics Balaenoptera musculus chilensis Chile D calls SEP calls Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 |
spellingShingle |
Chilean blue whales marine bioacoustics Balaenoptera musculus chilensis Chile D calls SEP calls Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 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 Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 |
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 |
Article in Journal/Newspaper |
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 |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/jmse10030316 https://doaj.org/article/2d2266ef62a34762a100188a7a2a73b0 |
geographic |
Austral |
geographic_facet |
Austral |
genre |
Balaenoptera musculus Blue whale |
genre_facet |
Balaenoptera musculus Blue whale |
op_source |
Journal of Marine Science and Engineering, Vol 10, Iss 316, p 316 (2022) |
op_relation |
https://www.mdpi.com/2077-1312/10/3/316 https://doaj.org/toc/2077-1312 doi:10.3390/jmse10030316 2077-1312 https://doaj.org/article/2d2266ef62a34762a100188a7a2a73b0 |
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 |
_version_ |
1766366739898040320 |