Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility
Funder: Gates Cambridge Trust; doi: http://dx.doi.org/10.13039/501100005370 : Funder: British Antarctic Survey; doi: http://dx.doi.org/10.13039/501100007849 : Abstract: Diving is an ecologically important behaviour that provides air-breathing predators with opportunities to capture prey, but that al...
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ftdatacite:10.17863/cam.64910 2023-05-15T13:41:37+02:00 Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility Bentley, L. K. Kato, A. Ropert-Coudert, Y. Manica, A. Phillips, R. A. 2021 https://dx.doi.org/10.17863/cam.64910 https://www.repository.cam.ac.uk/handle/1810/317795 unknown Apollo - University of Cambridge Repository Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Original Paper Text Article article-journal ScholarlyArticle 2021 ftdatacite https://doi.org/10.17863/cam.64910 2021-11-05T12:55:41Z Funder: Gates Cambridge Trust; doi: http://dx.doi.org/10.13039/501100005370 : Funder: British Antarctic Survey; doi: http://dx.doi.org/10.13039/501100007849 : Abstract: Diving is an ecologically important behaviour that provides air-breathing predators with opportunities to capture prey, but that also increases their exposure to incidental mortality (bycatch) in commercial fisheries. In this study, we characterised the diving behaviour of 26 individuals of three species, the black-browed albatross Thalassarche melanophris, grey-headed albatross T. chrysostoma and light-mantled albatross Phoebetria palpebrata, breeding at Bird Island, South Georgia. Individuals were tracked using Global Location Sensor (GLS)-immersion loggers and time-depth recorders (TDRs) and, for two species, Global Positioning System (GPS) loggers. Although the TDRs recorded 589 dives (defined in this paper as submersion > 1 m), average dive depths and durations were just 1.30–1.49 m and 2.5–3.3 s, respectively, for the three species. In addition, many individuals (22% of black-browed, 20% of grey-headed, and 57% of light-mantled albatrosses; total n = 9, 10 and 7 individuals, respectively) did not dive at all. Most dives occurred at the distal end of foraging trips and were rare during the commuting phase. No dives took place in darkness, despite long periods spent on water at night. The limited and shallow dive activity contrasts with impressions from a previous study using capillary-tube depth gauges (which are less accurate than TDRs) and has implications for the susceptibility of albatrosses to bycatch on longlines. This study provides further support for regulations requiring night setting and increased sink rates of baited hooks to help mitigate albatross bycatch. Text Antarc* Antarctic Bird Island British Antarctic Survey DataCite Metadata Store (German National Library of Science and Technology) Antarctic Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Original Paper |
spellingShingle |
Original Paper Bentley, L. K. Kato, A. Ropert-Coudert, Y. Manica, A. Phillips, R. A. Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility |
topic_facet |
Original Paper |
description |
Funder: Gates Cambridge Trust; doi: http://dx.doi.org/10.13039/501100005370 : Funder: British Antarctic Survey; doi: http://dx.doi.org/10.13039/501100007849 : Abstract: Diving is an ecologically important behaviour that provides air-breathing predators with opportunities to capture prey, but that also increases their exposure to incidental mortality (bycatch) in commercial fisheries. In this study, we characterised the diving behaviour of 26 individuals of three species, the black-browed albatross Thalassarche melanophris, grey-headed albatross T. chrysostoma and light-mantled albatross Phoebetria palpebrata, breeding at Bird Island, South Georgia. Individuals were tracked using Global Location Sensor (GLS)-immersion loggers and time-depth recorders (TDRs) and, for two species, Global Positioning System (GPS) loggers. Although the TDRs recorded 589 dives (defined in this paper as submersion > 1 m), average dive depths and durations were just 1.30–1.49 m and 2.5–3.3 s, respectively, for the three species. In addition, many individuals (22% of black-browed, 20% of grey-headed, and 57% of light-mantled albatrosses; total n = 9, 10 and 7 individuals, respectively) did not dive at all. Most dives occurred at the distal end of foraging trips and were rare during the commuting phase. No dives took place in darkness, despite long periods spent on water at night. The limited and shallow dive activity contrasts with impressions from a previous study using capillary-tube depth gauges (which are less accurate than TDRs) and has implications for the susceptibility of albatrosses to bycatch on longlines. This study provides further support for regulations requiring night setting and increased sink rates of baited hooks to help mitigate albatross bycatch. |
format |
Text |
author |
Bentley, L. K. Kato, A. Ropert-Coudert, Y. Manica, A. Phillips, R. A. |
author_facet |
Bentley, L. K. Kato, A. Ropert-Coudert, Y. Manica, A. Phillips, R. A. |
author_sort |
Bentley, L. K. |
title |
Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility |
title_short |
Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility |
title_full |
Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility |
title_fullStr |
Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility |
title_full_unstemmed |
Diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility |
title_sort |
diving behaviour of albatrosses: implications for foraging ecology and bycatch susceptibility |
publisher |
Apollo - University of Cambridge Repository |
publishDate |
2021 |
url |
https://dx.doi.org/10.17863/cam.64910 https://www.repository.cam.ac.uk/handle/1810/317795 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
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Antarctic Bird Island |
geographic_facet |
Antarctic Bird Island |
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Antarc* Antarctic Bird Island British Antarctic Survey |
genre_facet |
Antarc* Antarctic Bird Island British Antarctic Survey |
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Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.17863/cam.64910 |
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1766153008277618688 |