Krill swarms observed along transects 7 to 11 during the BROKE-West voyage
No known data quality issues. This is data describing acoustically observed krill swarms that was used in the Bestley et al. (2017) paper 'Predicting krill swarm characteristics important for marine predators foraging off East Antarctica' (http://onlinelibrary.wiley.com/doi/10.1111/ecog.03...
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Australian Ocean Data Network
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Online Access: | https://researchdata.ands.org.au/krill-swarms-observed-west-voyage/1324957 https://data.aad.gov.au/metadata/records/AAS_4050_SWARM https://data.aad.gov.au/eds/4608/download https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4050_SWARM https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4050 |
id |
ftands:oai:ands.org.au::1324957 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
biota oceans FISHERIES EARTH SCIENCE AQUATIC SCIENCES EUPHAUSIIDS (KRILL) BIOLOGICAL CLASSIFICATION ANIMALS/INVERTEBRATES ARTHROPODS CRUSTACEANS ECHOVIEW EK60 ACOUSTICS HYDROACOUSTICS ECHO SOUNDERS R/V AA > R/V Aurora Australis AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA |
spellingShingle |
biota oceans FISHERIES EARTH SCIENCE AQUATIC SCIENCES EUPHAUSIIDS (KRILL) BIOLOGICAL CLASSIFICATION ANIMALS/INVERTEBRATES ARTHROPODS CRUSTACEANS ECHOVIEW EK60 ACOUSTICS HYDROACOUSTICS ECHO SOUNDERS R/V AA > R/V Aurora Australis AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA Krill swarms observed along transects 7 to 11 during the BROKE-West voyage |
topic_facet |
biota oceans FISHERIES EARTH SCIENCE AQUATIC SCIENCES EUPHAUSIIDS (KRILL) BIOLOGICAL CLASSIFICATION ANIMALS/INVERTEBRATES ARTHROPODS CRUSTACEANS ECHOVIEW EK60 ACOUSTICS HYDROACOUSTICS ECHO SOUNDERS R/V AA > R/V Aurora Australis AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA |
description |
No known data quality issues. This is data describing acoustically observed krill swarms that was used in the Bestley et al. (2017) paper 'Predicting krill swarm characteristics important for marine predators foraging off East Antarctica' (http://onlinelibrary.wiley.com/doi/10.1111/ecog.03080/full). Abstract of the paper presented here: 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 ecosystems, and our findings are relevant to similar efforts examining biophysical linkages elsewhere in the Southern Ocean and beyond. This comma separated variable (CSV) file contains the krill swarm data used in: Bestley, S., Raymond, B., Gales, N.J., Harcourt, R.G., Hindell, M.A., Jonsen, I.D., Nicol, S., Peron, C., Sumner, M.D., Weimerskirch, H. and Wotherspoon, S.J., Cox, M.J. (2017). Predicting krill swarm characteristics important for marine predators foraging off East Antarctica. Ecography. The column descriptions are: Depth_mean_m = (units m) mean depth of a krill swarm Date = (YYYYMMDD) observation date (UTC) Time = (HH:mm:ss.ss) observation time (UTC) Lat = (dd.ddddd) latitude Lon = (ddd.ddddd) longitude transect = BROKE West transect number 7 to 11 (see Fig. 1, Bestley et al. 2017) denVolgm3 = (units g wet mass m-3) internal krill swarm density in gram wet mass per cubic metre. This data set can be used to describe the vertical distribution and internal densities of krill swarms observed along transects 7 to 11 of the 2006 BROKE-West voyage. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
Krill swarms observed along transects 7 to 11 during the BROKE-West voyage |
title_short |
Krill swarms observed along transects 7 to 11 during the BROKE-West voyage |
title_full |
Krill swarms observed along transects 7 to 11 during the BROKE-West voyage |
title_fullStr |
Krill swarms observed along transects 7 to 11 during the BROKE-West voyage |
title_full_unstemmed |
Krill swarms observed along transects 7 to 11 during the BROKE-West voyage |
title_sort |
krill swarms observed along transects 7 to 11 during the broke-west voyage |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.ands.org.au/krill-swarms-observed-west-voyage/1324957 https://data.aad.gov.au/metadata/records/AAS_4050_SWARM https://data.aad.gov.au/eds/4608/download https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4050_SWARM https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4050 |
op_coverage |
Spatial: northlimit=-62; southlimit=-67; westlimit=60; eastLimit=80 Temporal: From 2006-02-08 to 2006-02-27 |
long_lat |
ENVELOPE(172.417,172.417,-83.817,-83.817) ENVELOPE(-63.727,-63.727,-74.499,-74.499) ENVELOPE(60,80,-62,-67) |
geographic |
Antarctic Austral East Antarctica Harcourt Southern Ocean Sumner The Antarctic |
geographic_facet |
Antarctic Austral East Antarctica Harcourt Southern Ocean Sumner The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Antarctica aurora australis East Antarctica Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica aurora australis East Antarctica Euphausia superba Southern Ocean |
op_source |
https://data.aad.gov.au |
op_relation |
https://researchdata.ands.org.au/krill-swarms-observed-west-voyage/1324957 43b600e5-e7e9-4f45-ac4f-a61b343f2339 https://data.aad.gov.au/metadata/records/AAS_4050_SWARM https://data.aad.gov.au/eds/4608/download https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4050_SWARM https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4050 |
_version_ |
1766246195260293120 |
spelling |
ftands:oai:ands.org.au::1324957 2023-05-15T13:47:00+02:00 Krill swarms observed along transects 7 to 11 during the BROKE-West voyage AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-62; southlimit=-67; westlimit=60; eastLimit=80 Temporal: From 2006-02-08 to 2006-02-27 https://researchdata.ands.org.au/krill-swarms-observed-west-voyage/1324957 https://data.aad.gov.au/metadata/records/AAS_4050_SWARM https://data.aad.gov.au/eds/4608/download https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4050_SWARM https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4050 unknown Australian Ocean Data Network https://researchdata.ands.org.au/krill-swarms-observed-west-voyage/1324957 43b600e5-e7e9-4f45-ac4f-a61b343f2339 https://data.aad.gov.au/metadata/records/AAS_4050_SWARM https://data.aad.gov.au/eds/4608/download https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4050_SWARM https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4050 https://data.aad.gov.au biota oceans FISHERIES EARTH SCIENCE AQUATIC SCIENCES EUPHAUSIIDS (KRILL) BIOLOGICAL CLASSIFICATION ANIMALS/INVERTEBRATES ARTHROPODS CRUSTACEANS ECHOVIEW EK60 ACOUSTICS HYDROACOUSTICS ECHO SOUNDERS R/V AA > R/V Aurora Australis AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA dataset ftands 2020-01-05T21:58:43Z No known data quality issues. This is data describing acoustically observed krill swarms that was used in the Bestley et al. (2017) paper 'Predicting krill swarm characteristics important for marine predators foraging off East Antarctica' (http://onlinelibrary.wiley.com/doi/10.1111/ecog.03080/full). Abstract of the paper presented here: 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 ecosystems, and our findings are relevant to similar efforts examining biophysical linkages elsewhere in the Southern Ocean and beyond. This comma separated variable (CSV) file contains the krill swarm data used in: Bestley, S., Raymond, B., Gales, N.J., Harcourt, R.G., Hindell, M.A., Jonsen, I.D., Nicol, S., Peron, C., Sumner, M.D., Weimerskirch, H. and Wotherspoon, S.J., Cox, M.J. (2017). Predicting krill swarm characteristics important for marine predators foraging off East Antarctica. Ecography. The column descriptions are: Depth_mean_m = (units m) mean depth of a krill swarm Date = (YYYYMMDD) observation date (UTC) Time = (HH:mm:ss.ss) observation time (UTC) Lat = (dd.ddddd) latitude Lon = (ddd.ddddd) longitude transect = BROKE West transect number 7 to 11 (see Fig. 1, Bestley et al. 2017) denVolgm3 = (units g wet mass m-3) internal krill swarm density in gram wet mass per cubic metre. This data set can be used to describe the vertical distribution and internal densities of krill swarms observed along transects 7 to 11 of the 2006 BROKE-West voyage. Dataset Antarc* Antarctic Antarctic Krill Antarctica aurora australis East Antarctica Euphausia superba Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Antarctic Austral East Antarctica Harcourt ENVELOPE(172.417,172.417,-83.817,-83.817) Southern Ocean Sumner ENVELOPE(-63.727,-63.727,-74.499,-74.499) The Antarctic ENVELOPE(60,80,-62,-67) |