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

• Other Authors: AADC (originator), AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: biota; oceans; SEALS/SEA LIONS/WALRUSES; EARTH SCIENCE; BIOLOGICAL CLASSIFICATION; ANIMALS/VERTEBRATES; MAMMALS; CARNIVORES; MACQUARIE ISLAND; MARION ISLAND; MAWSON; SOUTHERN ELEPHANT SEAL; VESTFOLD HILLS; WEDDELL SEAL; VISUAL OBSERVATIONS; FIELD SURVEYS; OBIS > OCEAN BIOGEOGRAPHIC INFORMATION SYSTEM; COML > CENSUS OF MARINE LIFE; AMD/AU; CEOS; AMD; OCEAN > ATLANTIC OCEAN > SOUTH ATLANTIC OCEAN; INDIAN OCEAN; SOUTHERN OCEAN; PACIFIC OCEAN > SOUTH PACIFIC OCEAN; CONTINENT > AUSTRALIA/NEW ZEALAND > AUSTRALIA > Heard Island; SOUTHERN OCEAN > ANTARCTICA; GEOGRAPHIC REGION > POLAR; Antarctic; Indian; New Zealand; Pacific; Southern Ocean; Vestfold; Vestfold Hills; Weddell; Antarc*; Antarctica; Elephant Seal; Elephant Seals; Macquarie Island; Marion Island; South Atlantic Ocean; Southern Elephant Seal; Weddell Seal; walrus*
• Online Access: https://researchdata.ands.org.au/subset-tags-database-elephant-seals/687210; https://data.aad.gov.au/metadata/records/TAGS_Elephant_Seals; https://data.aad.gov.au/eds/4351/download; https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=90; http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=TAGS_Elephant_Seals

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