Rottnest Island lakes, swamps and coastal bird counts December 1981 to September 2007

The salt lakes and swamps of Rottnest Island were surveyed by two observers, who between them walked round all the lakes and swamps (see figure of lakes and swamps below), with the exception of Barker Swamp, in the centre of the island. All birds, except Silver Gulls, seen around or on the lakes and swamps were identified and counted. The coastal surveys was conducted by one observer who drove round the island, stopping at 32 vantage points (see figure of observation locations below), from which observations were made with the aid of a telescope on a tripod and binoculars. All birds (with the exception of Silver Gulls) were identified and counted. Any species seen that were not initially identified were approached to identify them. Three complete surveys of birds of the coast were conducted between 24-27 September 1982, 21-23 September 1992 and 3-4 September 2007 by the same observer. These surveys commenced at the main jetty on Thomson Bay and involved walking anti-clockwise around the island; a distance of 37km. All beaches and cliff faces were traversed and the observer walked as close to the cliff edges as safety permitted. Counts were made of all non-terrestrial birds, with the exception of Silver Gull. These data on the birds of the salt lakes, swamps and coast of Rottnest Island were collected by Research Scientist Denis Saunders and Technical Officer Perry de Rebeira of CSIRO Division of Wildlife and Rangelands Research as part of research on island bird communities.

罗特内斯特岛（Rottnest Island）的盐湖与湿地由两名观测人员开展调查，二人遍历了岛上除岛中央巴克沼泽（Barker Swamp）之外的全部盐湖与湿地（盐湖与湿地分布详见下文附图）。所有在盐湖、湿地周边或水面活动的鸟类（银鸥（Silver Gull）除外）均被识别并计数。海岸调查由一名观测人员完成，其驾车环绕岛屿，在32个观测点位停靠（观测点位分布详见下文附图），并借助三脚架望远镜与双筒望远镜开展观测。所有鸟类（银鸥除外）均被识别并计数；若遇到初始无法识别的物种，则会靠近以完成物种鉴定。1982年9月24日至27日、1992年9月21日至23日以及2007年9月3日至4日，同一名观测人员先后开展了三次完整的海岸鸟类调查。本次调查以汤姆森湾主码头为起点，沿逆时针方向环绕岛屿行进，全程37公里，途经所有海滩与崖壁区域，并在确保安全的前提下尽可能贴近崖壁边缘开展观测。本次调查统计了所有非陆生鸟类（银鸥除外）的种群数量。罗特内斯特岛盐湖、湿地及海岸的鸟类调查数据，由澳大利亚联邦科学与工业研究组织（CSIRO）野生动物与牧场研究分部的研究科学家丹尼斯·桑德斯（Denis Saunders）与技术专员佩里·德·雷贝拉（Perry de Rebeira）采集，作为岛屿鸟类群落研究的一部分。