Predicting krill swarm characteristics important for marine predators foraging off East Antarctica
International audience Open ocean predator-prey interactions are often difficult to interpret because of a lack of information on prey fields at scales relevant to predator behaviour. Hence, there is strong interest in identifying the biological and physical factors influencing the distribution and...
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Online Access: | https://hal.archives-ouvertes.fr/hal-01571975 https://doi.org/10.1111/ecog.03080 |
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ftccsdartic:oai:HAL:hal-01571975v1 2023-05-15T13:32:58+02:00 Predicting krill swarm characteristics important for marine predators foraging off East Antarctica Bestley, Sophie Raymond, B Gales, N. Harcourt, R. Hindell, Mark A Jonsen, I. Nicol, S. Péron, C. Sumner, M. Weimerskirch, Henri Wotherspoon, Simon Cox, M. Australian Antarctic Division (AAD) Australian Government, Department of the Environment and Energy Dept of Biological Sciences Australia Macquarie University Sydney Institute for Marine and Antarctic Studies Horbat (IMAS) University of Tasmania Hobart, Australia (UTAS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2018 https://hal.archives-ouvertes.fr/hal-01571975 https://doi.org/10.1111/ecog.03080 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/ecog.03080 hal-01571975 https://hal.archives-ouvertes.fr/hal-01571975 doi:10.1111/ecog.03080 ISSN: 0906-7590 EISSN: 1600-0587 Ecography https://hal.archives-ouvertes.fr/hal-01571975 Ecography, Wiley, 2018, 41, pp.996-1012. ⟨10.1111/ecog.03080⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.1111/ecog.03080 2021-11-07T03:47:08Z International audience Open ocean predator-prey interactions are often difficult to interpret because of a lack of information on prey fields at scales relevant to predator behaviour. Hence, there is strong interest in identifying the biological and physical factors influencing the distribution and abundance of prey species, which may be of broad predictive use for conservation planning and evaluating effects of environmental change. This study focuses on a key Southern Ocean prey species, Antarctic krill Euphausia superba, using acoustic observations of individual swarms (aggregations) from a large-scale survey off East Antarctica. We developed two sets of statistical models describing swarm characteristics, one set using underway survey data for the explanatory variables, and the other using their satellite remotely sensed analogues. While survey data are in situ and contemporaneous with the swarm data, remotely sensed data are all that is available for prediction and inference about prey distribution in other areas or at other times. The fitted models showed that the primary biophysical influences on krill swarm characteristics included daylight (solar elevation/radiation) and proximity to the Antarctic continental slope, but there were also complex relationships with current velocities and gradients. Overall model performance was similar regardless of whether underway or remotely sensed predictors were used. We applied the latter models to generate regional-scale spatial predictions using a 10-yr remotely-sensed time series. This retrospective modelling identified areas off east Antarctica where relatively dense krill swarms were consistently predicted during austral mid-summers, which may underpin key foraging areas for marine predators. Spatiotemporal predictions along Antarctic predator satellite tracks, from independent studies, illustrate the potential for uptake into further quantitative modelling of predator movements and foraging. The approach is widely applicable to other krill-dependent ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica East Antarctica Euphausia superba Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Austral East Antarctica Southern Ocean The Antarctic Ecography 41 6 996 1012 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Bestley, Sophie Raymond, B Gales, N. Harcourt, R. Hindell, Mark A Jonsen, I. Nicol, S. Péron, C. Sumner, M. Weimerskirch, Henri Wotherspoon, Simon Cox, M. Predicting krill swarm characteristics important for marine predators foraging off East Antarctica |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Open ocean predator-prey interactions are often difficult to interpret because of a lack of information on prey fields at scales relevant to predator behaviour. Hence, there is strong interest in identifying the biological and physical factors influencing the distribution and abundance of prey species, which may be of broad predictive use for conservation planning and evaluating effects of environmental change. This study focuses on a key Southern Ocean prey species, Antarctic krill Euphausia superba, using acoustic observations of individual swarms (aggregations) from a large-scale survey off East Antarctica. We developed two sets of statistical models describing swarm characteristics, one set using underway survey data for the explanatory variables, and the other using their satellite remotely sensed analogues. While survey data are in situ and contemporaneous with the swarm data, remotely sensed data are all that is available for prediction and inference about prey distribution in other areas or at other times. The fitted models showed that the primary biophysical influences on krill swarm characteristics included daylight (solar elevation/radiation) and proximity to the Antarctic continental slope, but there were also complex relationships with current velocities and gradients. Overall model performance was similar regardless of whether underway or remotely sensed predictors were used. We applied the latter models to generate regional-scale spatial predictions using a 10-yr remotely-sensed time series. This retrospective modelling identified areas off east Antarctica where relatively dense krill swarms were consistently predicted during austral mid-summers, which may underpin key foraging areas for marine predators. Spatiotemporal predictions along Antarctic predator satellite tracks, from independent studies, illustrate the potential for uptake into further quantitative modelling of predator movements and foraging. The approach is widely applicable to other krill-dependent ... |
author2 |
Australian Antarctic Division (AAD) Australian Government, Department of the Environment and Energy Dept of Biological Sciences Australia Macquarie University Sydney Institute for Marine and Antarctic Studies Horbat (IMAS) University of Tasmania Hobart, Australia (UTAS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Bestley, Sophie Raymond, B Gales, N. Harcourt, R. Hindell, Mark A Jonsen, I. Nicol, S. Péron, C. Sumner, M. Weimerskirch, Henri Wotherspoon, Simon Cox, M. |
author_facet |
Bestley, Sophie Raymond, B Gales, N. Harcourt, R. Hindell, Mark A Jonsen, I. Nicol, S. Péron, C. Sumner, M. Weimerskirch, Henri Wotherspoon, Simon Cox, M. |
author_sort |
Bestley, Sophie |
title |
Predicting krill swarm characteristics important for marine predators foraging off East Antarctica |
title_short |
Predicting krill swarm characteristics important for marine predators foraging off East Antarctica |
title_full |
Predicting krill swarm characteristics important for marine predators foraging off East Antarctica |
title_fullStr |
Predicting krill swarm characteristics important for marine predators foraging off East Antarctica |
title_full_unstemmed |
Predicting krill swarm characteristics important for marine predators foraging off East Antarctica |
title_sort |
predicting krill swarm characteristics important for marine predators foraging off east antarctica |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-01571975 https://doi.org/10.1111/ecog.03080 |
geographic |
Antarctic Austral East Antarctica Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral East Antarctica Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Antarctica East Antarctica Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica East Antarctica Euphausia superba Southern Ocean |
op_source |
ISSN: 0906-7590 EISSN: 1600-0587 Ecography https://hal.archives-ouvertes.fr/hal-01571975 Ecography, Wiley, 2018, 41, pp.996-1012. ⟨10.1111/ecog.03080⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/ecog.03080 hal-01571975 https://hal.archives-ouvertes.fr/hal-01571975 doi:10.1111/ecog.03080 |
op_doi |
https://doi.org/10.1111/ecog.03080 |
container_title |
Ecography |
container_volume |
41 |
container_issue |
6 |
container_start_page |
996 |
op_container_end_page |
1012 |
_version_ |
1766037289794797568 |