Data

Diet and Foraging Area of Antarctic Fur Seals at Heard Island

Australian Ocean Data Network
Burton, H. ; BURTON, HARRY
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://data.aad.gov.au/metadata/records/ASAC_466&rft.title=Diet and Foraging Area of Antarctic Fur Seals at Heard Island&rft.identifier=http://data.aad.gov.au/metadata/records/ASAC_466&rft.publisher=Australian Antarctic Data Centre&rft.description=Antarctic Fur Seals from Heard Island fed mainly on fish, but the prey species changed both seasonally and inter-annually. The majority of prey were pelagic myctophids characteristic of deep oceanic water, and were generally taken in autumn and winter. The only other fish taken in significant numbers was Champsocephalus gunnari which was mostly taken from late winter through early autumn when it was co-dominant in the diet with the Krefftichthys anderssoni. Males and females foraged in different localities and in different parts of the water column. Males foraged mainly to the south of Heard Island in winter usually diving deep by day, feeding on scattering layers. In summer males also fed on the shelf, presumably to the north and east of Heard Island on K. anderssoni at shallow depths primarily at night. Although diet studies provided little evidence of feeding on crustaceans, diving data indicate that some males may travel to Antarctic waters in winter to feed on krill.The fields in this dataset are:MonthsSpeciesScatsTime foragingNumber of DivesTime Submerged (minutes)Mean Dive Duration (minutes)Maximum Depth (metres)Progress Code: completedStatement: Collections were made on a monthly basis from February 1992 through to March 1993. In winter, scats were only collected on new snow because it was difficult to determine the age of scats exposed by frequent snow thaws.&rft.creator=Burton, H. &rft.creator=BURTON, HARRY &rft.date=2000&rft.coverage=westlimit=73.23761; southlimit=-53.20439; eastlimit=73.84735; northlimit=-52.96022&rft.coverage=westlimit=73.23761; southlimit=-53.20439; eastlimit=73.84735; northlimit=-52.96022&rft.coverage=uplimit=444; downlimit=0&rft.coverage=uplimit=444; downlimit=0&rft_rights=These data are publicly available for download from the provided URL.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=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=ASAC_466 when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=biota&rft_subject=oceans&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES&rft_subject=DEPTH&rft_subject=DIVE DURATION&rft_subject=FORAGING&rft_subject=FUR SEALS&rft_subject=FISH&rft_subject=HEARD ISLAND&rft_subject=NUMBER OF DIVES&rft_subject=MONTHS&rft_subject=SCATS&rft_subject=SOUTHERN OCEAN&rft_subject=SPECIES&rft_subject=TIME FORAGING&rft_subject=TIME SUBMERGED&rft_subject=VISUAL OBSERVATIONS&rft_subject=FIELD SURVEYS&rft_subject=AMD/AU&rft_subject=CEOS&rft_subject=AMD&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS&rft.type=dataset&rft.language=English Access the data
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CC-BY

Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/legalcode

These data are publicly available for download from the provided URL.

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=ASAC_466 when using these data.

This metadata record is publicly available.

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Full description

Antarctic Fur Seals from Heard Island fed mainly on fish, but the prey species changed both seasonally and inter-annually. The majority of prey were pelagic myctophids characteristic of deep oceanic water, and were generally taken in autumn and winter. The only other fish taken in significant numbers was Champsocephalus gunnari which was mostly taken from late winter through early autumn when it was co-dominant in the diet with the Krefftichthys anderssoni. Males and females foraged in different localities and in different parts of the water column. Males foraged mainly to the south of Heard Island in winter usually diving deep by day, feeding on scattering layers. In summer males also fed on the shelf, presumably to the north and east of Heard Island on K. anderssoni at shallow depths primarily at night. Although diet studies provided little evidence of feeding on crustaceans, diving data indicate that some males may travel to Antarctic waters in winter to feed on krill.

The fields in this dataset are:

Months
Species
Scats
Time foraging
Number of Dives
Time Submerged (minutes)
Mean Dive Duration (minutes)
Maximum Depth (metres)

Lineage

Progress Code: completed
Statement: Collections were made on a monthly basis from February 1992 through to March 1993. In winter, scats were only collected on new snow because it was difficult to determine the age of scats exposed by frequent snow thaws.

Data time period: 1992-02-01 to 1993-03-31

This dataset is part of a larger collection

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73.84735,-52.96022 73.84735,-53.20439 73.23761,-53.20439 73.23761,-52.96022 73.84735,-52.96022

73.54248,-53.082305

text: westlimit=73.23761; southlimit=-53.20439; eastlimit=73.84735; northlimit=-52.96022

text: uplimit=444; downlimit=0

Subjects
AMD | AMD/AU | CEOS | DEPTH | DIVE DURATION | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > MAMMALS > CARNIVORES > SEALS/SEA LIONS/WALRUSES | FIELD SURVEYS | FISH | FORAGING | FUR SEALS | GEOGRAPHIC REGION > POLAR | HEARD ISLAND | MONTHS | NUMBER OF DIVES | OCEAN > SOUTHERN OCEAN | OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS | SCATS | SOUTHERN OCEAN | SPECIES | TIME FORAGING | TIME SUBMERGED | VISUAL OBSERVATIONS | biota | oceans |

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Other Information
Download page for the Australian Antarctic Data Centre (GET DATA)

uri : https://data.aad.gov.au/eds/1004/download

Public information for ASAC project 466 (PROJECT HOME PAGE)

uri : https://projects.aad.gov.au/search_projects_results.cfm?project_no=466

Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)

uri : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_466

Identifiers
  • global : ASAC_466