Antarctic Fur Seal Populations on Heard Island Summer 1987-1988

Abstract from ANARE Research Notes 72 The Antarctic fur seal Arctocephalus gazella has increased in numbers at Heard Island since the Australian National Antarctic Research Expeditions (ANARE) station was established in 1947. Increases have also been recorded at other breeding sites in the South Atlantic and South Indian Oceans this century, particularly at South Georgia.

In the 1987-88 summer, fur seals at Heard Island were counted in several age and sex categories. The aims of the project were to determine the location of pupping sites, the extent of the pupping season and the size of the population, and to record the changes in numbers of animals ashore during the summer. Maps of the colonies and main haul-out areas, together with descriptions of census areas and tabulations of counts, provide a basis for future comparison.

This dataset contains the results from surveys of Antarctic Fur Seals (Arctocephalus gazella) on Heard Island during the summer of 1987-1988. As well as habitat descriptions, age, sex, count of adults and pups were determined. The three major aims of the study include: to determine accurately the location of pupping sites; to determine the extent of the pupping season, the median date of birth and the number of pups born; and to census fur seals on as much of the island as possible in order to determine the number of animals ashore and to document changes in numbers during the summer. The results are listed in the document, which includes detailed tabulations of counts made at colonies and major haul-out sites on Macquarie Island during summer 1987-88, and descriptions and maps of these locations. Tagging, mainly of pups, was also undertaken, and a total of 234 pups, 8 under-yearlings, 9 yearlings, 2 juveniles and 1 sub-adult male were tagged. Counts at 3-day intervals (pups) were made between 25 November and 19 December 1987, and major censuses were made between 19 December 1987 and 25 February 1988.

The fields in this dataset are:
Locality
Age Class
Date
Colony
Bulls
Cows
Pups

《澳大利亚国家南极研究探险队（Australian National Antarctic Research Expeditions, ANARE）研究笔记72》摘要
自1947年澳大利亚国家南极研究探险队（ANARE）站点建立以来，赫德岛（Heard Island）的南极海狗（Antarctic fur seal, *Arctocephalus gazella*）种群数量持续增长。本世纪以来，南大西洋与南印度洋的其他繁殖地也记录到了种群增长，其中以南乔治亚岛（South Georgia）的增幅尤为显著。

1987-1988年夏季，研究人员按多个年龄与性别类别对赫德岛的南极海狗进行了计数。本项目的研究目标包括：确定繁殖产仔场的位置、产仔季的时长与种群规模，以及记录夏季上岸海狗的数量变化。海狗繁殖群与主要休憩地的分布图、普查区域说明以及计数汇总表，可为后续的对比研究提供基础。

本数据集收录了1987-1988年夏季对赫德岛南极海狗（Antarctic fur seal, *Arctocephalus gazella*）的调查结果。除栖息地描述外，研究人员还对海狗的年龄、性别以及成体与幼崽的数量进行了统计。本研究的三大核心目标为：精准确定产仔场的位置；明确产仔季的时长、幼崽出生的中位日期以及新生幼崽的数量；对全岛尽可能多的区域开展海狗普查，以确定上岸个体的数量并记录夏季种群数量的变化。本研究结果整理于本报告中，包含1987-1988年夏季麦夸里岛（Macquarie Island）各繁殖群与主要休憩地的详细计数汇总表，以及上述区域的说明与分布图。研究同时开展了海狗标记工作，主要标记对象为幼崽，共计标记234只幼崽、8只不满1岁的亚幼体、9只1岁龄个体、2只亚成体以及1只亚成年雄性。1987年11月25日至12月19日期间，研究人员每3天对幼崽开展一次计数；1987年12月19日至1988年2月25日期间则开展了大规模普查。

本数据集包含以下字段：
采样地点（Locality）
年龄组（Age Class）
调查日期（Date）
繁殖群位置（Colony）
成年雄性数量（Bulls）
成年雌性数量（Cows）
幼崽数量（Pups）