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

This database is a compendium of histories of known age seals (leopard) from observations across the Southern Ocean but primarily focussed on Macquarie Island. Although the following information pertains to Elephant Seals, it is assumed similar procedures were undertaken with the Leopard Seals between 1957 and 1999:"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."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.本数据库为基于南大洋多区域观测所得的已知年龄豹海豹（Leopard Seal）历史资料汇编，研究重点主要集中于麦夸里岛（Macquarie Island）。尽管下述内容针对象海豹（Elephant Seal），但研究默认1957年至1999年间针对豹海豹采用了一致的实验流程：1993年至2003年间，研究团队在麦夸里岛每年对1000头新生海豹进行体重测量，并在后肢趾间蹼佩戴两枚塑料鳍肢标记（plastic flipper tags）；待这些标记个体断奶时，研究人员会再次测量其体重，并同步采集体长、体围、脂肪厚度及鳍肢尺寸数据。断奶三周后，研究团队通过热烙铁烙印法为2000头海豹完成永久性个体标记。通过对这些已知年龄的个体开展重捕与再次称重，研究人员得以计算海豹的生长速率及年龄特异性存活率。1950年至1965年间，研究团队针对象海豹采集了同类数据，彼时采用热烙铁烙印法进行个体标记；基于该批次标记个体的标记重捕数据，研究人员得以评估该衰退种群的种群统计学特征。研究团队同时采集了该批次象海豹的体长与体重数据，并首次实现了不捕杀个体前提下的单只海豹生长情况评估。该数据库原由澳大利亚南极数据中心（Australian Antarctic Data Centre）托管，但因维护问题下线。研究团队于2018年6月对该数据库进行快照备份，并存储于Access数据库（Access）中。本项研究系ASAC项目90的研究成果之一。