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Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels

Understanding the vertical migration behaviour of Antarctic krill is important for understanding spatial distribution, ecophysiology, trophic interactions and carbon fluxes of this Southern Ocean key species. In this study, we analysed an eight-month continuous dataset recorded with an ES80 echosoun...

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Autores principales: Bahlburg, Dominik, Hüppe, Lukas, Böhrer, Thomas, Thorpe, Sally E., Murphy, Eugene J., Berger, Uta, Meyer, Bettina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10523065/
https://www.ncbi.nlm.nih.gov/pubmed/37771962
http://dx.doi.org/10.1098/rsos.230520
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author Bahlburg, Dominik
Hüppe, Lukas
Böhrer, Thomas
Thorpe, Sally E.
Murphy, Eugene J.
Berger, Uta
Meyer, Bettina
author_facet Bahlburg, Dominik
Hüppe, Lukas
Böhrer, Thomas
Thorpe, Sally E.
Murphy, Eugene J.
Berger, Uta
Meyer, Bettina
author_sort Bahlburg, Dominik
collection PubMed
description Understanding the vertical migration behaviour of Antarctic krill is important for understanding spatial distribution, ecophysiology, trophic interactions and carbon fluxes of this Southern Ocean key species. In this study, we analysed an eight-month continuous dataset recorded with an ES80 echosounder on board a commercial krill fishing vessel in the southwest Atlantic sector of the Southern Ocean. Our analysis supports the existing hypothesis that krill swarms migrate into deeper waters during winter but also reveals a high degree of variability in vertical migration behaviour within seasons, even at small spatial scales. During summer, we found that behaviour associated with prolonged surface presence primarily occurred at low surface chlorophyll a concentrations whereas multiple ascent–descent cycles per day occurred when surface chlorophyll a concentrations were elevated. The high plasticity, with some krill swarms behaving differently in the same location at the same time, suggests that krill behaviour is not a purely environmentally driven process. Differences in life stage, physiology and type of predator are likely other important drivers. Finally, our study demonstrates new ways of using data from krill fishing vessels, and with the routine collection of additional information in potential future projects, they have great potential to significantly advance our understanding of krill ecology.
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spelling pubmed-105230652023-09-28 Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels Bahlburg, Dominik Hüppe, Lukas Böhrer, Thomas Thorpe, Sally E. Murphy, Eugene J. Berger, Uta Meyer, Bettina R Soc Open Sci Ecology, Conservation and Global Change Biology Understanding the vertical migration behaviour of Antarctic krill is important for understanding spatial distribution, ecophysiology, trophic interactions and carbon fluxes of this Southern Ocean key species. In this study, we analysed an eight-month continuous dataset recorded with an ES80 echosounder on board a commercial krill fishing vessel in the southwest Atlantic sector of the Southern Ocean. Our analysis supports the existing hypothesis that krill swarms migrate into deeper waters during winter but also reveals a high degree of variability in vertical migration behaviour within seasons, even at small spatial scales. During summer, we found that behaviour associated with prolonged surface presence primarily occurred at low surface chlorophyll a concentrations whereas multiple ascent–descent cycles per day occurred when surface chlorophyll a concentrations were elevated. The high plasticity, with some krill swarms behaving differently in the same location at the same time, suggests that krill behaviour is not a purely environmentally driven process. Differences in life stage, physiology and type of predator are likely other important drivers. Finally, our study demonstrates new ways of using data from krill fishing vessels, and with the routine collection of additional information in potential future projects, they have great potential to significantly advance our understanding of krill ecology. The Royal Society 2023-09-27 /pmc/articles/PMC10523065/ /pubmed/37771962 http://dx.doi.org/10.1098/rsos.230520 Text en © 2023 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited.
spellingShingle Ecology, Conservation and Global Change Biology
Bahlburg, Dominik
Hüppe, Lukas
Böhrer, Thomas
Thorpe, Sally E.
Murphy, Eugene J.
Berger, Uta
Meyer, Bettina
Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels
title Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels
title_full Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels
title_fullStr Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels
title_full_unstemmed Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels
title_short Plasticity and seasonality of the vertical migration behaviour of Antarctic krill using acoustic data from fishing vessels
title_sort plasticity and seasonality of the vertical migration behaviour of antarctic krill using acoustic data from fishing vessels
topic Ecology, Conservation and Global Change Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10523065/
https://www.ncbi.nlm.nih.gov/pubmed/37771962
http://dx.doi.org/10.1098/rsos.230520
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