Antarctic krill likely avoid underwater gliders
The extent to which marine species avoid survey vessels is the subject of considerable debate, with stimuli such as noise and pressure waves receiving particular attention. By some estimates, avoidance behaviour is a major bias in the assessment of pelagic species distribution and density. Surveyors...
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ftnerc:oai:nora.nerc.ac.uk:519747 2023-05-15T13:49:34+02:00 Antarctic krill likely avoid underwater gliders Guihen, D. Brearley, J. Alexander Fielding, Sophie 2022-01 http://nora.nerc.ac.uk/id/eprint/519747/ https://www.sciencedirect.com/science/article/pii/S096706372100217X?via%3Dihub unknown Elsevier Guihen, D.; Brearley, J. Alexander orcid:0000-0003-3700-8017 Fielding, Sophie orcid:0000-0002-3152-4742 . 2022 Antarctic krill likely avoid underwater gliders. Deep-Sea Research Part I: Oceanographic Research Papers, 179, 103680. 10, pp. https://doi.org/10.1016/j.dsr.2021.103680 <https://doi.org/10.1016/j.dsr.2021.103680> Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1016/j.dsr.2021.103680 2023-02-04T19:46:24Z The extent to which marine species avoid survey vessels is the subject of considerable debate, with stimuli such as noise and pressure waves receiving particular attention. By some estimates, avoidance behaviour is a major bias in the assessment of pelagic species distribution and density. Surveyors of the marine environment are increasingly using autonomous platforms; thus the question of avoidance of these novel platforms must be considered. A long-duration, underwater glider with an integrated echo-sounder was deployed to measure the density and distribution of Antarctic krill. We show that krill reacted to the glider, despite the low-noise profile of the platform. The weighted-mean depth of krill swarms was observed to deepen when a glider came within 30 m. In addition, we observed a near-range decrease in depth-integrated acoustic backscatter and we demonstrate that this effect is not explained by the instrument's acoustic footprint. The potential triggers for these behaviours are discussed. The list of sensors available for use on a glider is increasing, with some producing sound, light or other potential stimuli for behavioural response. Our paper demonstrates that caution should be used when designing mission payloads and in the interpretation of acoustic data for animal density from gliders. A key consideration for surveyors may be the factoring in of an exclusion zone from their analyses. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Natural Environment Research Council: NERC Open Research Archive Antarctic Deep Sea Research Part I: Oceanographic Research Papers 179 103680 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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description |
The extent to which marine species avoid survey vessels is the subject of considerable debate, with stimuli such as noise and pressure waves receiving particular attention. By some estimates, avoidance behaviour is a major bias in the assessment of pelagic species distribution and density. Surveyors of the marine environment are increasingly using autonomous platforms; thus the question of avoidance of these novel platforms must be considered. A long-duration, underwater glider with an integrated echo-sounder was deployed to measure the density and distribution of Antarctic krill. We show that krill reacted to the glider, despite the low-noise profile of the platform. The weighted-mean depth of krill swarms was observed to deepen when a glider came within 30 m. In addition, we observed a near-range decrease in depth-integrated acoustic backscatter and we demonstrate that this effect is not explained by the instrument's acoustic footprint. The potential triggers for these behaviours are discussed. The list of sensors available for use on a glider is increasing, with some producing sound, light or other potential stimuli for behavioural response. Our paper demonstrates that caution should be used when designing mission payloads and in the interpretation of acoustic data for animal density from gliders. A key consideration for surveyors may be the factoring in of an exclusion zone from their analyses. |
format |
Article in Journal/Newspaper |
author |
Guihen, D. Brearley, J. Alexander Fielding, Sophie |
spellingShingle |
Guihen, D. Brearley, J. Alexander Fielding, Sophie Antarctic krill likely avoid underwater gliders |
author_facet |
Guihen, D. Brearley, J. Alexander Fielding, Sophie |
author_sort |
Guihen, D. |
title |
Antarctic krill likely avoid underwater gliders |
title_short |
Antarctic krill likely avoid underwater gliders |
title_full |
Antarctic krill likely avoid underwater gliders |
title_fullStr |
Antarctic krill likely avoid underwater gliders |
title_full_unstemmed |
Antarctic krill likely avoid underwater gliders |
title_sort |
antarctic krill likely avoid underwater gliders |
publisher |
Elsevier |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/519747/ https://www.sciencedirect.com/science/article/pii/S096706372100217X?via%3Dihub |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill |
genre_facet |
Antarc* Antarctic Antarctic Krill |
op_relation |
Guihen, D.; Brearley, J. Alexander orcid:0000-0003-3700-8017 Fielding, Sophie orcid:0000-0002-3152-4742 . 2022 Antarctic krill likely avoid underwater gliders. Deep-Sea Research Part I: Oceanographic Research Papers, 179, 103680. 10, pp. https://doi.org/10.1016/j.dsr.2021.103680 <https://doi.org/10.1016/j.dsr.2021.103680> |
op_doi |
https://doi.org/10.1016/j.dsr.2021.103680 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
179 |
container_start_page |
103680 |
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1766251756993380352 |