All scientific data collected by the Australian Antarctic program (AAp) are eventually described in the Catalogue of Australian Antarctic and Subantarctic Metadata (CAASM). CAASM can be used to search through AAp data descriptions, and it also provides links to access publicly available datasets, which can either be immediately downloaded or obtained from the Australian Antarctic Data Centre (AADC).

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Citation
Burton, H., Mcmahon, C., Van Den Hoff, J. (2000, updated 2018) Seal database of known-age animals from the Antarctic and subantarctic Southern Ocean Australian Antarctic Data Centre - doi:10.4225/15/5b347aa58b93e
Title
Seal database of known-age animals from the Antarctic and subantarctic Southern Ocean
Data Centre
Australian Antarctic Data Centre, Australia
DOI
doi:10.4225/15/5b347aa58b93e
Created Date
2000-05-08
Revision Date
2018-06-28
Parent record
None
Child record
TAGS_Elephant_Seals
Tags_heard_1949
TAGS_Leopard_Seals
TAGS_Weddell_Seals

Description

This database is a compendium of histories of known age seals (Weddell and Southern elephant) from observations across the Southern Ocean but focussed on Macquarie Island, Marion Island, Heard Island, Mawson and the Vestfold Hills.

At Macquarie Island 1000 seals were weighed per annum between 1993-2003 at birth and individually marked with two plastic flipper tags in the inter-digital webbing of their hind flippers. These tagged seals were weighed again at weaning, when length, girth, fat depth, and flipper measurements were made. Three weeks after weaning 2000 seals were permanently and individually marked by hot-iron branding. Recaptures and re-weighings of these known aged individuals were used to calculate growth and age-specific survival of the seals.

Similar data were collected from elephant seals between 1950 and 1965 when seals were individually marked by hot-iron branding. Mark-recapture data from these cohorts were used to assess the demography of the declining population. Length and mass data were also collected for these cohorts and were used, for the first time, to assess the growth of individual seals without killing them.

At Marion Island all the elephant seals have been individually marked with two plastic flipper tags in their rear flippers. Recaptures of these seals were used to compare survival at Marion and Macquarie Islands.

At Heard Island, seals were branded between 1949-1953. Seal length was measured in feet and inches. Recaptures of seals were made up until 1955, and growth and age-specific survival was calculated. Survival data from Heard Island were compared with concurrent data from Macquarie Island.

The database was held by the Australian Antarctic Data Centre, but was taken offline due to maintenance problems. A snapshot of the database was taken in June 2018 and stored in an access database.

This work was completed as part of ASAC project 90.

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Quality

Observations are approximately 95% accurate. Errors in observation and entry possible where animals are misplaced.

Access

These data had been held in an online database, but that application has since been removed from the live pages of the Australian Antarctic Data Centre. An extract of the database was taken in June, 2018 and has been attached to this metadata record, but it is not publicly available for download. For access, contact the Australian Antarctic Data Centre.

The Access file attached to this metadata record comprises the amalgamated database file. Several subsets have been created (which may have different access privileges) - see the child records for details.

Temporal Coverages

Spatial Coverages

Science Keywords

Additional Keywords

  • LEOPARD SEALS
  • MACQUARIE ISLAND
  • MARION ISLAND
  • MAWSON
  • SOUTHERN ELEPHANT SEAL
  • VESTFOLD HILLS
  • WEDDELL SEAL

Locations

  • OCEAN > ATLANTIC OCEAN
  • OCEAN > INDIAN OCEAN
  • OCEAN > SOUTHERN OCEAN
  • OCEAN > PACIFIC OCEAN
  • CONTINENT > AUSTRALIA/NEW ZEALAND > HEARD ISLAND
  • OCEAN > SOUTHERN OCEAN
  • CONTINENT > ANTARCTICA
  • GEOGRAPHIC REGION > POLAR

Platforms

  • FIELD SURVEYS

Instruments

  • VISUAL OBSERVATIONS

Researchers

  • burton, harry (INVESTIGATOR)
  • mcmahon, clive (INVESTIGATOR)
  • van den hoff, john (TECHNICAL CONTACT)

Use Constraints

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=TAGS when using these data.

Creative Commons License