BGS Hosted Metadata
Macrozooplankton and nekton vertical distribution and abundance at the sustained observation location P3 in the northern Scotia Sea (Southern Ocean) during November and December 2017
Macrozooplankton and nekton were collected with a Rectangular Midwater Trawl 25 (RMT25) over several visits to the sustained observation location P3 (52.70 S, 40.26 W) in the northern Scotia Sea during November and December 2017. The work was carried out as part of the NERC Large Grant, COMICS (Controls on Mesopelagic Interior Carbon) on board the RRS Discovery (cruise DY086). The RMT25 net hauls sampled between 10 and 500 m depth, with the water column divided into 2 depth intervals (10-250 m and 250-500 m). A total of 6 hauls were obtained during 3 separate visits to station P3, each visit comprising a pair of hauls, of which one was carried out in nominal daytime and the other in nominal nighttime. Catches were immediately sorted on board and identified to the lowest taxonomic level feasible. Subsamples of the catches were retained, principally for subsequent biochemical and physiological analyses.
In total, 777 fish were caught, belonging to at least 23 species, with catches dominated by the myctophids Krefftichthys anderssoni, Gymnoscopelus braueri, Electrona antarctica and Protomyctophum tenesoni. The water column below 250m was dominated by Bathylagus spp. Temperate myctophid species, such as Protomyctophum parallelum and Protomyctophum andreyeshevi were also caught in small numbers. With regards macrozooplankton, the 250m-500m depth interval was dominated by the jellyfish, Atolla and Periphylla. The tunicate Salpa thompsoni and the euphausiids Euphausia triacantha and Thysanoessa spp. were also relatively abundant. Jellyfish still dominated catches in shallower waters (250m-10m), closely followed by euphausiids and Salpa thompsoni and chaetognaths. Themisto gaudichaudii and Parandania boecki were the most numerous amphipod species caught. Decapods were only caught in the deeper depth interval, both day and night.
Simple
- Date (Creation)
- 2020-06-12
- Date (Revision)
- 2020-06-12
- Date (Publication)
- 2020-06-12
- Date (released)
- 2020-06-12
- Edition
-
1.0
- Unique resource identifier
- https://doi.org/10.5285/e184e81a-e43c-424e-abec-122036ee2cfd
- Codespace
-
doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01337
- Codespace
- Other citation details
-
Please cite this item as: Stowasser, G., Fielding, S., Belcher, A., Mayor, D., Cook, K., & Tarling, G. (2020). Macrozooplankton and nekton vertical distribution and abundance at the sustained observation location P3 in the northern Scotia Sea (Southern Ocean) during November and December 2017 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/e184e81a-e43c-424e-abec-122036ee2cfd
- Credit
-
No credit.
- Status
- Completed
- Point of contact
-
Organisation name Individual name Electronic mail address Role British Antarctic Survey Stowasser, Gabriele Author British Antarctic Survey Fielding, Sophie Author British Antarctic Survey Belcher, Anna Author National Oceanography Centre
Mayor, Daniel Author National Oceanography Centre
Cook, Kathryn Author British Antarctic Survey Tarling, Geraint Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
-
-
Amphipods
-
Chaetognaths
-
Cnidaria
-
Euphausiids
-
Mesopelagic
-
Myctophids
-
- Place
-
-
Scotia Sea Southern Ocean
-
-
GEMET - INSPIRE themes, version 1.0
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- Other restrictions
- Other constraints
- no limitations
- Use constraints
- License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
-
This is NERC-funded data, and its use must follow the Open Government License:
- Use constraints
- Other restrictions
- Other constraints
-
None.
- Unique resource identifier
- doi
- Codespace
-
doi
- Association Type
- Cross reference
- Unique resource identifier
- doi
- Codespace
-
doi
- Association Type
- Cross reference
- Unique resource identifier
- doi
- Codespace
-
doi
- Association Type
- Cross reference
- Unique resource identifier
- doi
- Codespace
-
doi
- Association Type
- Cross reference
- Unique resource identifier
- doi
- Codespace
-
doi
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
-
url
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
-
url
- Association Type
- Larger work citation
- Unique resource identifier
- url
- Codespace
-
url
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
-
url
- Association Type
- Cross reference
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
-
- Biota
- Environment
- Oceans
)
- Begin date
- 2017-11-17
- End date
- 2017-12-10
- Supplemental Information
-
It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.
- Title
-
European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
-
Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
-
6.18.3
Distributor
- Distributor contact
-
Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Distributor format
-
Name Version text/plain text/csv
- Units of distribution
-
bytes
- Transfer size
- 175411
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e184e81a-e43c-424e-abec-122036ee2cfd Get Data
- Units of distribution
-
bytes
- Transfer size
- 175411
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e184e81a-e43c-424e-abec-122036ee2cfd Get Data
- Hierarchy level
- Dataset
- Statement
-
Methodology:
An RMT25 net was used to sample the mesopelagic fish, squid and macrozooplankton community during the survey DY086 at the sustained observation station P3 (52.70°S, 40.26°W) in the northern Scotia Sea, Southern Ocean. The RMT25 is a midwater trawl with a mouth area of 25 m2 and a variable mesh size, 18 mm reducing to 5 mm towards the cod-end. The RMT25 used in this instance had two separate nets allowing two different depth intervals to be sampled discretely. These intervals were set at 500-250 m and 250-10 m. Samples were collected across three time stations (P3 A, P3 B and P3 C) approximately 10 days apart. At each time station, one deployment was undertaken during the hours of darkness and one in daylight, making a total of 6 deployments over the entire cruise. The RMT25 was operated via a downwire net monitor and was equipped with a flow meter, and temperature and salinity sensors. Each depth interval was sampled for approximately 40 mins while the ship maintained a speed of 2 knots.
When retrieved, the total weight of each RMT25 net haul was initially recorded with a calibrated, motion compensated weighing scales before further taxonomic analysis. All fish, squid and macrozooplankton specimens were identified to species level, where possible, and the composite weight and numbers per species recorded. Where necessary, sub-samples of the total catch of a species were counted and then multiplied by the inverse of the sub-sample fraction to determine total numbers in the catch. After sorting, a sub sample of specimens were either frozen for stable isotope and lipid analysis at -80°C or flash-frozen in liquid nitrogen for ETS (details not recorded here).
The abundances and weights in the datasheets are those directly recorded after the catch was sorted on board. Subsequent dry weights were calculated based on wet weight to dry weight relationships, either reported in the literature or obtained from dry weight measurements on specimens retained from this cruise or similar cruises in this region (listed in datasheets).
Data collection:
1. An RMT25 trawl (25m2 mouth diameter, 5 mm minimum mesh size)
2. Motion-compensated weighing scales
3. Volumetric flasks
4. Binocular microscope
Data quality:
All species were identified according to the taxonomic guides available at time of analysis and the user must be aware that some species names may have since been updated.
The entire catch was sorted and all specimens above ~4 mm were recorded at least to a low taxonomic level. The absence of any taxon from the datasheet indicates that it was not present in the catch.
Metadata
- File identifier
- e184e81a-e43c-424e-abec-122036ee2cfd XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2020-06-12
- Metadata standard name
-
ISO 19115 Geographic Information - Metadata
- Metadata standard version
-
ISO 19115:2003(E)
- Metadata author
-
Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
))
