Population trends of black-browed albatrosses at Heard Island, 1947 - 2001.

The breeding population of the black-browed albatross Thalassarche melanophrys has increased at Heard Island since the first census data were obtained in 1947/1948. Four breeding localities are known, and all populations have increased in the period 1947/1948-2000/2001. The breeding population is estimated to have been approximately 200 pairs in 1947/1948. Based on 2000/2001 census data, the population has increased to a minimum of approximately 600 pairs over the 53 years. Two mechanisms, that of increased prey availability through scavenging discards from trawlers operating within their foraging range, and climatic amelioration, are proposed as hypotheses for this increase.

The fields in this dataset are:
Season
Dates
Location
Numbers
Nests
Adults
Chicks

自1947/1948年首次获取普查数据以来，赫德岛（Heard Island）的黑眉信天翁（black-browed albatross，学名Thalassarche melanophrys）繁殖种群持续呈现增长态势。目前已知该物种共有4处繁殖栖息地，在1947/1948至2000/2001年的研究周期内，所有种群的数量均实现增长。1947/1948年其繁殖种群规模估计约为200对；根据2000/2001年的普查数据，在这53年的时长中，种群数量至少已增长至约600对。针对此次种群增长，研究提出了两种假说机制：一是通过取食其觅食范围内拖网渔船丢弃的渔获物，提升了猎物可获得性；二是气候条件改善。

本数据集包含以下字段：季节（Season）、日期（Dates）、地点（Location）、数量（Numbers）、巢数（Nests）、成鸟（Adults）、雏鸟（Chicks）