Two unit analysis of Sri Lankan pygmy blue whale song over a decade
Sri Lankan pygmy blue whale song consists of three repeated units: (1) low frequency pulsive unit, (2) frequency modulated (FM) upsweep, and (3) long tonal downsweep. The Unit 2 FM unit has up to three visible upsweeps with energy concentrated at approximately 40, 50, and 60 Hz, while the Unit 3 (∼1...
Published in: | The Journal of the Acoustical Society of America |
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/two-unit-analysis-of-sri-lankan-pygmy-blue-whale-song-over-a-decade(f55fa730-c50f-4bde-aa26-2cd5725e9493).html https://doi.org/10.1121/1.5084269 https://research-repository.st-andrews.ac.uk/bitstream/10023/17689/1/Miksis_Olds_2018_Sri_Lankan_pygmy_shifts_JASA_AAM.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/f55fa730-c50f-4bde-aa26-2cd5725e9493 2023-05-15T15:45:08+02:00 Two unit analysis of Sri Lankan pygmy blue whale song over a decade Miksis-Olds, Jennifer L. Nieukirk, Sharon L. Harris, Danielle V. 2018-12-31 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/two-unit-analysis-of-sri-lankan-pygmy-blue-whale-song-over-a-decade(f55fa730-c50f-4bde-aa26-2cd5725e9493).html https://doi.org/10.1121/1.5084269 https://research-repository.st-andrews.ac.uk/bitstream/10023/17689/1/Miksis_Olds_2018_Sri_Lankan_pygmy_shifts_JASA_AAM.pdf eng eng info:eu-repo/semantics/openAccess Miksis-Olds , J L , Nieukirk , S L & Harris , D V 2018 , ' Two unit analysis of Sri Lankan pygmy blue whale song over a decade ' , Journal of the Acoustical Society of America , vol. 144 , no. 6 , pp. 3618-3626 . https://doi.org/10.1121/1.5084269 Sri Lankan pygmy blue whale Song Ambient sound Selection article 2018 ftunstandrewcris https://doi.org/10.1121/1.5084269 2021-12-26T14:33:44Z Sri Lankan pygmy blue whale song consists of three repeated units: (1) low frequency pulsive unit, (2) frequency modulated (FM) upsweep, and (3) long tonal downsweep. The Unit 2 FM unit has up to three visible upsweeps with energy concentrated at approximately 40, 50, and 60 Hz, while the Unit 3 (∼100 Hz) tonal downsweep is the most distinct unit lasting 20–30 s. Spectral characteristics of the Units 2 and 3 song elements, along with ocean sound levels, were analyzed in the Indian Ocean from 2002 to 2013. The peak frequency of the tonal Unit 3 calls decreased from approximately 106.5 to 100.7 Hz over a decade corresponding to a 5.4% decrease. Over the same time period, the frequency content of the Unit 2 upsweeps did not change as dramatically with only a 3.1% change. Ambient sound levels in the vocalization bands did not exhibit equivalent patterns in amplitude trends. Analysis showed no increase in the ambient sound or compensated peak amplitude levels of the tonal downsweeps, eliminating the presence of a Lombard effect. Here it is proposed that each song unit may convey different information and thus may be responding to different selective pressures. Article in Journal/Newspaper Blue whale University of St Andrews: Research Portal Indian Lombard ENVELOPE(-59.686,-59.686,-64.520,-64.520) The Journal of the Acoustical Society of America 144 6 3618 3626 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Sri Lankan pygmy blue whale Song Ambient sound Selection |
spellingShingle |
Sri Lankan pygmy blue whale Song Ambient sound Selection Miksis-Olds, Jennifer L. Nieukirk, Sharon L. Harris, Danielle V. Two unit analysis of Sri Lankan pygmy blue whale song over a decade |
topic_facet |
Sri Lankan pygmy blue whale Song Ambient sound Selection |
description |
Sri Lankan pygmy blue whale song consists of three repeated units: (1) low frequency pulsive unit, (2) frequency modulated (FM) upsweep, and (3) long tonal downsweep. The Unit 2 FM unit has up to three visible upsweeps with energy concentrated at approximately 40, 50, and 60 Hz, while the Unit 3 (∼100 Hz) tonal downsweep is the most distinct unit lasting 20–30 s. Spectral characteristics of the Units 2 and 3 song elements, along with ocean sound levels, were analyzed in the Indian Ocean from 2002 to 2013. The peak frequency of the tonal Unit 3 calls decreased from approximately 106.5 to 100.7 Hz over a decade corresponding to a 5.4% decrease. Over the same time period, the frequency content of the Unit 2 upsweeps did not change as dramatically with only a 3.1% change. Ambient sound levels in the vocalization bands did not exhibit equivalent patterns in amplitude trends. Analysis showed no increase in the ambient sound or compensated peak amplitude levels of the tonal downsweeps, eliminating the presence of a Lombard effect. Here it is proposed that each song unit may convey different information and thus may be responding to different selective pressures. |
format |
Article in Journal/Newspaper |
author |
Miksis-Olds, Jennifer L. Nieukirk, Sharon L. Harris, Danielle V. |
author_facet |
Miksis-Olds, Jennifer L. Nieukirk, Sharon L. Harris, Danielle V. |
author_sort |
Miksis-Olds, Jennifer L. |
title |
Two unit analysis of Sri Lankan pygmy blue whale song over a decade |
title_short |
Two unit analysis of Sri Lankan pygmy blue whale song over a decade |
title_full |
Two unit analysis of Sri Lankan pygmy blue whale song over a decade |
title_fullStr |
Two unit analysis of Sri Lankan pygmy blue whale song over a decade |
title_full_unstemmed |
Two unit analysis of Sri Lankan pygmy blue whale song over a decade |
title_sort |
two unit analysis of sri lankan pygmy blue whale song over a decade |
publishDate |
2018 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/two-unit-analysis-of-sri-lankan-pygmy-blue-whale-song-over-a-decade(f55fa730-c50f-4bde-aa26-2cd5725e9493).html https://doi.org/10.1121/1.5084269 https://research-repository.st-andrews.ac.uk/bitstream/10023/17689/1/Miksis_Olds_2018_Sri_Lankan_pygmy_shifts_JASA_AAM.pdf |
long_lat |
ENVELOPE(-59.686,-59.686,-64.520,-64.520) |
geographic |
Indian Lombard |
geographic_facet |
Indian Lombard |
genre |
Blue whale |
genre_facet |
Blue whale |
op_source |
Miksis-Olds , J L , Nieukirk , S L & Harris , D V 2018 , ' Two unit analysis of Sri Lankan pygmy blue whale song over a decade ' , Journal of the Acoustical Society of America , vol. 144 , no. 6 , pp. 3618-3626 . https://doi.org/10.1121/1.5084269 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1121/1.5084269 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
144 |
container_issue |
6 |
container_start_page |
3618 |
op_container_end_page |
3626 |
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