Data

Subset of data from the TAGS database of known age seals - Elephant Seals

Name: Subset of data from the TAGS database of known age seals - Elephant Seals
Published: 2000-05-08

Australian Antarctic Data Centre

BURTON, HARRY ; MCMAHON, CLIVE ; VAN DEN HOFF, JOHN

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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=info:doi10.4225/15/59fa97f242641&rft.title=Subset of data from the TAGS database of known age seals - Elephant Seals&rft.identifier=10.4225/15/59fa97f242641&rft.publisher=Australian Antarctic Data Centre&rft.description=This database is a compendium of histories of known age seals (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 and several csv files. This work was completed as part of ASAC project 90.&rft.creator=BURTON, HARRY &rft.creator=MCMAHON, CLIVE &rft.creator=VAN DEN HOFF, JOHN &rft.date=2000&rft.coverage=northlimit=-42.0; southlimit=-68.0; westlimit=35.0; eastLimit=-80.0; projection=WGS84&rft.coverage=northlimit=-42.0; southlimit=-68.0; westlimit=35.0; eastLimit=-80.0; projection=WGS84&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_Elephant_Seals when using these data.&rft_subject=biota&rft_subject=oceans&rft_subject=SEALS/SEA LIONS/WALRUSES&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/VERTEBRATES&rft_subject=MAMMALS&rft_subject=CARNIVORES&rft_subject=MACQUARIE ISLAND&rft_subject=MARION ISLAND&rft_subject=MAWSON&rft_subject=SOUTHERN ELEPHANT SEAL&rft_subject=VESTFOLD HILLS&rft_subject=WEDDELL SEAL&rft_subject=VISUAL OBSERVATIONS&rft_subject=FIELD SURVEYS&rft_subject=OBIS > OCEAN BIOGEOGRAPHIC INFORMATION SYSTEM&rft_subject=COML > CENSUS OF MARINE LIFE&rft_subject=OCEAN > ATLANTIC OCEAN > SOUTH ATLANTIC OCEAN&rft_subject=OCEAN > INDIAN OCEAN&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN&rft_subject=CONTINENT > AUSTRALIA/NEW ZEALAND > AUSTRALIA > Heard Island&rft_subject=OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND&rft_subject=CONTINENT > ANTARCTICA&rft_subject=GEOGRAPHIC REGION > POLAR&rft_place=Hobart&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_Elephant_Seals when using these data.

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A snapshot copy of the database taken in January 2015, and includes only data relating to elephant seals. It is publicly available for download from the provided URL. See the parent record for access to the complete database of all seal species.

Brief description

This database is a compendium of histories of known age seals (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 and several csv files.

This work was completed as part of ASAC project 90.

Issued: 2000-05-08

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

This dataset is part of a larger collection

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text: northlimit=-42.0; southlimit=-68.0; westlimit=35.0; eastLimit=-80.0; projection=WGS84

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Other Information

AU-ANL:PEAU : http://nla.gov.au/nla.party-617536 NLA Link

Identifiers

global : 289d5c5e-54e8-4605-828c-99432228be9f
DOI : 10.4225/15/59fa97f242641
Local : TAGS_Elephant_Seals
URI : https://data.aad.gov.au/metadata/records/TAGS_Elephant_Seals
URI : https://data.aad.gov.au/metadata/records/TAGS_Elephant_Seals

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