Fra klik til tæthed - akustisk optælling af marsvin med dataloggere
Monitoring abundance and population trends of small odontocetes is notoriously difficult and labour intensive. There is a need to develop alternative methods to the traditional visual line transect surveys, especially for low density areas. Here, the prospect of obtaining robust density estimates fo...
Published in: | The Journal of the Acoustical Society of America |
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Online Access: | https://pure.au.dk/portal/da/publications/from-echolocation-clicks-to-animal-density--acoustic-sampling-of-harbour-porpoises-with-static-dataloggers(fc60429f-931c-498b-9c9e-fee7fe6955f6).html https://doi.org/10.1121/1.3662070 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/fc60429f-931c-498b-9c9e-fee7fe6955f6 2023-05-15T16:33:26+02:00 Fra klik til tæthed - akustisk optælling af marsvin med dataloggere From echolocation clicks to animal density – acoustic sampling of harbour porpoises with static dataloggers Kyhn, Line Anker Tougaard, Jakob Thomas, L. Duve, Linda Rosager Stenback, J. Amundin, M. Desportes, G. Teilmann, Jonas 2012-01 https://pure.au.dk/portal/da/publications/from-echolocation-clicks-to-animal-density--acoustic-sampling-of-harbour-porpoises-with-static-dataloggers(fc60429f-931c-498b-9c9e-fee7fe6955f6).html https://doi.org/10.1121/1.3662070 eng eng info:eu-repo/semantics/restrictedAccess Kyhn , L A , Tougaard , J , Thomas , L , Duve , L R , Stenback , J , Amundin , M , Desportes , G & Teilmann , J 2012 , ' From echolocation clicks to animal density – acoustic sampling of harbour porpoises with static dataloggers ' , Acoustical Society of America. Journal , vol. 131 , no. 1 , pp. 550-560 . https://doi.org/10.1121/1.3662070 Abundance acoustics detection function monitorng article 2012 ftuniaarhuspubl https://doi.org/10.1121/1.3662070 2020-11-18T23:43:28Z Monitoring abundance and population trends of small odontocetes is notoriously difficult and labour intensive. There is a need to develop alternative methods to the traditional visual line transect surveys, especially for low density areas. Here, the prospect of obtaining robust density estimates for porpoises by passive acoustic monitoring (PAM) is demonstrated by combining rigorous application of methods adapted from distance sampling to PAM. Acoustic dataloggers (T-PODs) were deployed in an area where harbour porpoises concurrently were tracked visually. Probability of detection was estimated in a mark-recapture approach, where a visual sighting constituted a “mark” and a simultaneous acoustic detection a “recapture”. As a distance could be assigned to each visual observation, a detection function was estimated. Effective detection radius of T-PODs ranged from 22 to 104 m depending on T-POD type, T-POD-sensitivity, train classification settings and snapshot duration. The TPOD density estimates corresponded to the visual densities derived concurrently for the same period. With more dataloggers, located according to a systematic design, density estimates would be obtainable for a larger area. This provides a method suitable for monitoring in areas with densities too low for visual surveys to be practically feasible, e.g. the endangered harbour porpoise population in the Baltic. Article in Journal/Newspaper Harbour porpoise Aarhus University: Research The Journal of the Acoustical Society of America 131 1 550 560 |
institution |
Open Polar |
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Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Abundance acoustics detection function monitorng |
spellingShingle |
Abundance acoustics detection function monitorng Kyhn, Line Anker Tougaard, Jakob Thomas, L. Duve, Linda Rosager Stenback, J. Amundin, M. Desportes, G. Teilmann, Jonas Fra klik til tæthed - akustisk optælling af marsvin med dataloggere |
topic_facet |
Abundance acoustics detection function monitorng |
description |
Monitoring abundance and population trends of small odontocetes is notoriously difficult and labour intensive. There is a need to develop alternative methods to the traditional visual line transect surveys, especially for low density areas. Here, the prospect of obtaining robust density estimates for porpoises by passive acoustic monitoring (PAM) is demonstrated by combining rigorous application of methods adapted from distance sampling to PAM. Acoustic dataloggers (T-PODs) were deployed in an area where harbour porpoises concurrently were tracked visually. Probability of detection was estimated in a mark-recapture approach, where a visual sighting constituted a “mark” and a simultaneous acoustic detection a “recapture”. As a distance could be assigned to each visual observation, a detection function was estimated. Effective detection radius of T-PODs ranged from 22 to 104 m depending on T-POD type, T-POD-sensitivity, train classification settings and snapshot duration. The TPOD density estimates corresponded to the visual densities derived concurrently for the same period. With more dataloggers, located according to a systematic design, density estimates would be obtainable for a larger area. This provides a method suitable for monitoring in areas with densities too low for visual surveys to be practically feasible, e.g. the endangered harbour porpoise population in the Baltic. |
format |
Article in Journal/Newspaper |
author |
Kyhn, Line Anker Tougaard, Jakob Thomas, L. Duve, Linda Rosager Stenback, J. Amundin, M. Desportes, G. Teilmann, Jonas |
author_facet |
Kyhn, Line Anker Tougaard, Jakob Thomas, L. Duve, Linda Rosager Stenback, J. Amundin, M. Desportes, G. Teilmann, Jonas |
author_sort |
Kyhn, Line Anker |
title |
Fra klik til tæthed - akustisk optælling af marsvin med dataloggere |
title_short |
Fra klik til tæthed - akustisk optælling af marsvin med dataloggere |
title_full |
Fra klik til tæthed - akustisk optælling af marsvin med dataloggere |
title_fullStr |
Fra klik til tæthed - akustisk optælling af marsvin med dataloggere |
title_full_unstemmed |
Fra klik til tæthed - akustisk optælling af marsvin med dataloggere |
title_sort |
fra klik til tæthed - akustisk optælling af marsvin med dataloggere |
publishDate |
2012 |
url |
https://pure.au.dk/portal/da/publications/from-echolocation-clicks-to-animal-density--acoustic-sampling-of-harbour-porpoises-with-static-dataloggers(fc60429f-931c-498b-9c9e-fee7fe6955f6).html https://doi.org/10.1121/1.3662070 |
genre |
Harbour porpoise |
genre_facet |
Harbour porpoise |
op_source |
Kyhn , L A , Tougaard , J , Thomas , L , Duve , L R , Stenback , J , Amundin , M , Desportes , G & Teilmann , J 2012 , ' From echolocation clicks to animal density – acoustic sampling of harbour porpoises with static dataloggers ' , Acoustical Society of America. Journal , vol. 131 , no. 1 , pp. 550-560 . https://doi.org/10.1121/1.3662070 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1121/1.3662070 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
131 |
container_issue |
1 |
container_start_page |
550 |
op_container_end_page |
560 |
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1766023126399844352 |