Data

Seal database of known-age animals from the Antarctic and subantarctic Southern Ocean

Australian Ocean Data Network
Burton, H., McMahon, C., van den Hoff, J. and Hindell, M. ; BURTON, HARRY ; MCMAHON, CLIVE ; VAN DEN HOFF, JOHN ; HINDELL, MARK A.
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=Dataset DOI&rft.title=Seal database of known-age animals from the Antarctic and subantarctic Southern Ocean&rft.identifier=Dataset DOI&rft.publisher=Australian Antarctic Data Centre&rft.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.Progress Code: completedStatement: Observations are approximately 95% accurate. Errors in observation and entry possible where animals are misplaced. It is strongly recommended that prospective users of these data contact the investigators before using these data. Mark Hindell Mark.Hindell@utas.edu.au Clive McMahon clive.mcmahon@utas.edu.au John van den Hoff John.Vandenhoff@aad.gov.au&rft.creator=Burton, H., McMahon, C., van den Hoff, J. and Hindell, M. &rft.creator=BURTON, HARRY &rft.creator=MCMAHON, CLIVE &rft.creator=VAN DEN HOFF, JOHN &rft.creator=HINDELL, MARK A. &rft.date=2000&rft.coverage=westlimit=35; southlimit=-68; eastlimit=-80; northlimit=-42&rft.coverage=westlimit=35; southlimit=-68; eastlimit=-80; northlimit=-42&rft_rights=This metadata record is publicly available.&rft_rights=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, and is publicly available for download. 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.&rft_rights= 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=TAGS when using these data. http://creativecommons.org/licenses/by/4.0/).&rft_rights=Portable Network Graphic&rft_rights=https://i.creativecommons.org/l/by/3.0/88x31.png&rft_rights=Creative Commons by Attribution logo&rft_rights=Attribution 4.0 International (CC BY 4.0)&rft_rights=Legal code for Creative Commons by Attribution 4.0 International license&rft_rights=Attribution 4.0 International (CC BY 4.0)&rft_rights= https://creativecommons.org/licenses/by/4.0/legalcode&rft.type=dataset&rft.language=English Access the data
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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.
http://creativecommons.org/licenses/by/4.0/).

Attribution 4.0 International (CC BY 4.0)

https://creativecommons.org/licenses/by/4.0/legalcode

This metadata record is publicly available.

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, and is publicly available for download.

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.

Portable Network Graphic

https://i.creativecommons.org/l/by/3.0/88x31.png

Creative Commons by Attribution logo

Attribution 4.0 International (CC BY 4.0)

Legal code for Creative Commons by Attribution 4.0 International license

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Contact Information

metadata@aad.gov.au

Brief 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.

Lineage

Progress Code: completed
Statement: Observations are approximately 95% accurate. Errors in observation and entry possible where animals are misplaced.

It is strongly recommended that prospective users of these data contact the investigators before using these data.

Mark Hindell Mark.Hindell@utas.edu.au
Clive McMahon clive.mcmahon@utas.edu.au
John van den Hoff John.Vandenhoff@aad.gov.au

Data time period: 1950-01-01 to 2015-01-31

-80,-42 -80,-68 35,-68 35,-42 -80,-42

-22.5,-55

text: westlimit=35; southlimit=-68; eastlimit=-80; northlimit=-42

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Other Information
Download the June 2018 extract of the Seal Tagging Database (GET DATA > DIRECT DOWNLOAD)

uri : http://data.aad.gov.au/eds/4685/download

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