Krill swarms observed along transects 7 to 11 during the BROKE-West voyage
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.
Simple
Identification info
- Alternate title
- Krill swarms observed along transects 7 to 11 during the BROKE-West voyage
- Date (Publication)
- 2018-03-02
- Edition
- 1
- Citation identifier
-
Dataset DOI
- Title
- Information and documentation - Digital object identifier system
- Date (Publication)
- 2012-04-23
- Citation identifier
- ISO 26324:2012
- Citation identifier
- doi:10.4225/15/5a98a0fd53ded
Originator
Publisher
Principal investigator
Principal investigator
Collaborator
Collaborator
- Name
- CAASM Metadata
- Purpose
- 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.
- Status
- Completed
Custodian
Spatial resolution
- Vertical sampling distance
- 1
Spatial resolution
- Spatial resolution
- 20
Spatial resolution
- Spatial resolution
- 20
- Temporal resolution
-
PT10S
- Topic category
-
- Biota
- Oceans
Extent
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 2006-02-08 2006-02-27
Extent
- Description
- Vertical Extent - Altitude
Vertical element
- Minimum value
- 0
- Maximum value
- 0
- Identifier
- urn:x-ogc:def:cs:EPSG:6499
- Name
- Vertical CS. Axis: height (H). Orientation: up. UoM: m.
- Identifier
- urn:x-ogc:def:axis:EPSG:114
- Name
- height
- Title
- Acoustic characterisation of the broad-scale distribution and abundance of Antarctic krill (Euphausia superba) off East Antarctica (30-80 E) in January-March 2006
- Date (Publication)
- 2010
- Citation identifier
- 57
Author
- Name
- Deep Sea Research Part II: Topical Studies in Oceanography
- Issue identification
- 9-10
- Page
- 916-933
- Title
- Predicting krill swarm characteristics important for marine predators foraging off East Antarctica.
- Date (Publication)
- 2017
Author
- Name
- Ecography
- NASA/GCMD Earth Science Keywords
-
- EARTH SCIENCE > OCEANS > AQUATIC SCIENCES > FISHERIES
- EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS > EUPHAUSIIDS (KRILL)
- Keywords
-
- ECHOVIEW
- EK60
- ACOUSTICS
- HYDROACOUSTICS
- NASA/GCMD Earth Science Keywords
-
- ECHO SOUNDERS
- NASA/GCMD Earth Science Keywords
-
- R/V AA > R/V Aurora Australis
- NASA/GCMD Earth Science Keywords
-
- AMD/AU
- AMD
- CEOS
- NASA/GCMD Earth Science Keywords
-
- GEOGRAPHIC REGION > POLAR
- OCEAN > SOUTHERN OCEAN
- CONTINENT > ANTARCTICA
Resource constraints
- Use limitation
- This metadata record is publicly available.
Resource constraints
- Access constraints
- licence
- Other constraints
- These data are publicly available for download from the provided URL.
Resource constraints
- File type
- Portable Network Graphic
- Title
- Attribution 4.0 International (CC BY 4.0)
- Website
-
https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license
- Use constraints
- licence
- Other constraints
- Please cite the following papers if you use this data: 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. http://onlinelibrary.wiley.com/doi/10.1111/ecog.03080/full Jarvis, T., Kelly, N., Kawaguchi, S., van Wijk, E., and Nicol, S. (2010). Acoustic characterisation of the broad-scale distribution and abundance of Antarctic krill (Euphausia superba) off East Antarctica (30-80 E) in January-March 2006. Deep Sea Research Part II: Topical Studies in Oceanography, 57(9-10), 916-933. https://doi.org/10.1016/j.dsr2.2008.06.013 This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4050_SWARM when using these data.
- Language
- English
- Character encoding
- UTF8
Distribution Information
Distributor
Distributor
Distributor
- Fees
- Free
- Planned available datetime
- 2018-03-02T00:00:00
- Units of distribution
- kb
- Transfer size
- 60
- Distribution format
-
- csv
- OnLine resource
-
GET DATA
Download the dataset
- OnLine resource
-
PROJECT HOME PAGE
Public information for AAS project AAS_4050
- OnLine resource
-
VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset.
Resource lineage
- Statement
- No known data quality issues.
- Hierarchy level
- Dataset
- Maintenance and update frequency
- As needed
- Maintenance note
- 2018-03-02 - record created by Martin Cox.
Metadata
- Metadata identifier
- string/AAS_4050_SWARM
- Language
- English
- Character encoding
- UTF8
Author
Sponsor
Owner
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 43b600e5-e7e9-4f45-ac4f-a61b343f2339
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2021-11-17T12:22:29
Identifier
- Description
- metadata.extraction_date
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 8.6
- Metadata linkage
-
http://data.aad.gov.au/metadata/records/AAS_4050_SWARM
Point of truth for the metadata record
- Date info (Creation)
- 2018-03-02T00:00:00
- Date info (Last Update)
- 2018-03-02
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile