Seal database of known-age animalsEntry ID: TAGS
Abstract: 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 January 2015 and stored in an access database.
This work was completed as part of ASAC project 90.
Data Set Citation
Dataset Originator/Creator: Burton, H., McMahon, C. and van den Hoff, J.
Dataset Title: Seal database of known-age animals
Dataset Series Name: CAASM Metadata
Dataset Publisher: Australian Antarctic Data CentreOnline Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...
Start Date: 1950-01-01Stop Date: 2015-01-31
Quality Observations are approximately 95% accurate. Errors in observation and entry possible where animals are misplaced.
Access Constraints A snapshot copy of the database taken in January 2015, but it is not publicly available for download. For access, contact the Australian Antarctic Data Centre.
Use Constraints This data set conforms to the PICCCBY Attribution License
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.
Data Set Progress
Distribution Media: HTTP
Email: c.r.mcmahon at swansea.ac.uk
University of Wales Swansea Singleton Park
Province or State: Wales
Postal Code: SA2 8PP
Country: United Kingdom
Role: TECHNICAL CONTACT
Phone: +61 3 6232 3447
Fax: +61 3 6232 3351
Email: john_van at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2000-05-08
Last DIF Revision Date: 2016-10-18