Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions
Predator data and exploratory fishing in the Scotia Sea have revealed the presence of cephalopod stocks in the Antarctic Polar Frontal Zone (PFZ). This is a vast, remote region where large epipelagic cephalopods aggregate into highly mobile schools making them difficult to locate and sample. We used...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Inter-Research
1996
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/515274/ https://doi.org/10.3354/meps136037 |
id |
ftnerc:oai:nora.nerc.ac.uk:515274 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:515274 2023-05-15T13:49:33+02:00 Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions Rodhouse, P.G. Prince, P.A. Trathan, P.N. Hatfield, E.M.C. Watkins, J.L. Bone, D.G. Murphy, E.J. White, M.G. 1996-06 http://nora.nerc.ac.uk/id/eprint/515274/ https://doi.org/10.3354/meps136037 unknown Inter-Research Rodhouse, P.G.; Prince, P.A.; Trathan, P.N. orcid:0000-0001-6673-9930 Hatfield, E.M.C.; Watkins, J.L.; Bone, D.G.; Murphy, E.J. orcid:0000-0002-7369-9196 White, M.G. 1996 Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions. Marine Ecology Progress Series, 136. 37-50. https://doi.org/10.3354/meps136037 <https://doi.org/10.3354/meps136037> Publication - Article PeerReviewed 1996 ftnerc https://doi.org/10.3354/meps136037 2023-02-04T19:43:58Z Predator data and exploratory fishing in the Scotia Sea have revealed the presence of cephalopod stocks in the Antarctic Polar Frontal Zone (PFZ). This is a vast, remote region where large epipelagic cephalopods aggregate into highly mobile schools making them difficult to locate and sample. We used satellite tagged predators and shipboard acoustics for coarse and fine scale location of cephalopod concentrations, and sampled them with commercial and scientific nets to determine the relationship between cephalopod distribution and mesoscale oceanographic features at the PFZ. Satellite tags were attached to 9 grey-headed albatrosses Diomedea chrysostoma, breeding at Bird Island, South Georgia, to monitor foraging at sea in January-March 1994. A foraging area at the PFZ, north of South Georgia, was located, an acoustic survey undertaken and a fixed station established where acoustic targets were found. A net survey was carried out with a commercial pelagic trawl, a rectangular midwater trawl 25 m2 (RMT25), a horizontal multiple plankton sampler and a neuston net. Acoustic layers were targeted and the RMT25 sampled 200 m layers to 1000 m in daylight and darkness. Cephalopods were simultaneously recovered from food samples fed to D. chrysostoma chicks at Bird Island. Two CTD transects, approximately normal to the major current flow, were undertaken across the PFZ and remote-sensed sea-surface temperature images from NOAA polar orbiting satellites were obtained aboard ship. The pelagic trawl sampled a cephalopod community that closely resembled that exploited by D. chrysostoma. The largest and most conspicuous species was the ommastrephid squid Martialia hyadesi which is the most important cephalopod prey species. Net-sampled M. hyadesi had been feeding on crustaceans and mesopelagic fish. The cephalopod community was sampled in a feature, interpreted as a warm core ring, in an area characterised by mesoscale features associated with the bathymetry of the northern end of the Northeast Georgia Rise and near a gap in ... Article in Journal/Newspaper Antarc* Antarctic Bird Island Scotia Sea Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Scotia Sea Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Georgia Rise ENVELOPE(-32.500,-32.500,-52.500,-52.500) Northeast Georgia Rise ENVELOPE(-32.500,-32.500,-52.500,-52.500) Marine Ecology Progress Series 136 37 50 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Predator data and exploratory fishing in the Scotia Sea have revealed the presence of cephalopod stocks in the Antarctic Polar Frontal Zone (PFZ). This is a vast, remote region where large epipelagic cephalopods aggregate into highly mobile schools making them difficult to locate and sample. We used satellite tagged predators and shipboard acoustics for coarse and fine scale location of cephalopod concentrations, and sampled them with commercial and scientific nets to determine the relationship between cephalopod distribution and mesoscale oceanographic features at the PFZ. Satellite tags were attached to 9 grey-headed albatrosses Diomedea chrysostoma, breeding at Bird Island, South Georgia, to monitor foraging at sea in January-March 1994. A foraging area at the PFZ, north of South Georgia, was located, an acoustic survey undertaken and a fixed station established where acoustic targets were found. A net survey was carried out with a commercial pelagic trawl, a rectangular midwater trawl 25 m2 (RMT25), a horizontal multiple plankton sampler and a neuston net. Acoustic layers were targeted and the RMT25 sampled 200 m layers to 1000 m in daylight and darkness. Cephalopods were simultaneously recovered from food samples fed to D. chrysostoma chicks at Bird Island. Two CTD transects, approximately normal to the major current flow, were undertaken across the PFZ and remote-sensed sea-surface temperature images from NOAA polar orbiting satellites were obtained aboard ship. The pelagic trawl sampled a cephalopod community that closely resembled that exploited by D. chrysostoma. The largest and most conspicuous species was the ommastrephid squid Martialia hyadesi which is the most important cephalopod prey species. Net-sampled M. hyadesi had been feeding on crustaceans and mesopelagic fish. The cephalopod community was sampled in a feature, interpreted as a warm core ring, in an area characterised by mesoscale features associated with the bathymetry of the northern end of the Northeast Georgia Rise and near a gap in ... |
format |
Article in Journal/Newspaper |
author |
Rodhouse, P.G. Prince, P.A. Trathan, P.N. Hatfield, E.M.C. Watkins, J.L. Bone, D.G. Murphy, E.J. White, M.G. |
spellingShingle |
Rodhouse, P.G. Prince, P.A. Trathan, P.N. Hatfield, E.M.C. Watkins, J.L. Bone, D.G. Murphy, E.J. White, M.G. Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions |
author_facet |
Rodhouse, P.G. Prince, P.A. Trathan, P.N. Hatfield, E.M.C. Watkins, J.L. Bone, D.G. Murphy, E.J. White, M.G. |
author_sort |
Rodhouse, P.G. |
title |
Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions |
title_short |
Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions |
title_full |
Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions |
title_fullStr |
Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions |
title_full_unstemmed |
Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions |
title_sort |
cephalopods and mesoscale oceanography at the antarctic polar front:satellite tracked predators locate pelagic trophic interactions |
publisher |
Inter-Research |
publishDate |
1996 |
url |
http://nora.nerc.ac.uk/id/eprint/515274/ https://doi.org/10.3354/meps136037 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(-32.500,-32.500,-52.500,-52.500) ENVELOPE(-32.500,-32.500,-52.500,-52.500) |
geographic |
Antarctic The Antarctic Scotia Sea Bird Island Georgia Rise Northeast Georgia Rise |
geographic_facet |
Antarctic The Antarctic Scotia Sea Bird Island Georgia Rise Northeast Georgia Rise |
genre |
Antarc* Antarctic Bird Island Scotia Sea |
genre_facet |
Antarc* Antarctic Bird Island Scotia Sea |
op_relation |
Rodhouse, P.G.; Prince, P.A.; Trathan, P.N. orcid:0000-0001-6673-9930 Hatfield, E.M.C.; Watkins, J.L.; Bone, D.G.; Murphy, E.J. orcid:0000-0002-7369-9196 White, M.G. 1996 Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions. Marine Ecology Progress Series, 136. 37-50. https://doi.org/10.3354/meps136037 <https://doi.org/10.3354/meps136037> |
op_doi |
https://doi.org/10.3354/meps136037 |
container_title |
Marine Ecology Progress Series |
container_volume |
136 |
container_start_page |
37 |
op_container_end_page |
50 |
_version_ |
1766251597420036096 |