Breeding shorebird observation data including degree of oiling for shorebirds in Louisiana, Mississippi, Alabama, and Texas, 2010-2011

This report contains breeding shorebird observation data, and provides additional context for the posted dataset, including information about the collection, analysis, and organization of the data. Characteristics of this dataset include the following: • The breeding shorebird data focus primarily on Wilson’s plovers, snowy plovers, and American oystercatchers, as well as other breeding shorebirds in the project area. • This dataset includes data initially collected independently by Trustees. • Before posting, extensive work was done independently by BP contractors to verify some aspects of the posted data (e.g., positional coordinates and field data). Data were collected by shore-based observers working in Louisiana, Mississippi, Alabama, and Texas in the summer of 2010 and again in the summer of 2011. The data were collected independently by the Trustees under the work plan titled Gulf Coast Breeding, Beach-Nesting Bird Populations in Areas Impacted by the BP Deepwater Horizon / Mississippi Canyon 252 Oil Spill: Bird Study No. 8, including the associated 2011 addendum. This dataset includes data associated with breeding shorebird site conditions, live bird counts, and assessments to categorize the degree of visible oil on live birds. Each observed bird was categorized as not visibly oiled or as having trace (≤5 percent), light (6 to 20 percent), moderate (21 to 40 percent), or heavy (>40 percent) oiling. Photographs of birds were taken where possible. The methods used to collect live bird visible oiling data were similar to those that guided the collection of data associated with the Live Bird Oiling Data Publication Summary Report (Reference No. B-01v01-02). Sampling variations may exist across observers, methods, locations, and times.

本报告包含繁殖滨鸟观测数据，并为所发布的数据集提供补充背景信息，涵盖数据的采集、分析与整理规范。本数据集的特征如下：
• 本次繁殖滨鸟观测数据主要聚焦于威尔逊鸻（Wilson’s plovers）、雪鸻（snowy plovers）以及美洲蛎鹬（American oystercatchers），同时涵盖项目区域内的其他繁殖滨鸟物种。
• 本数据集包含由受托方独立采集的原始数据。
• 正式发布前，BP承包商独立开展了大量核查工作，对所发布数据的部分内容（如位置坐标与野外采集数据）进行了验证。

数据由沿岸观测人员于2010年夏季及2011年夏季，在路易斯安那州、密西西比州、阿拉巴马州与得克萨斯州境内完成采集。受托方依据名为《受BP深水地平线/密西西比峡谷252号漏油事件影响区域的墨西哥湾沿岸繁殖、海滩筑巢鸟类种群：鸟类研究第8号》及其2011年补充方案的工作大纲，独立完成了本次数据采集。

本数据集涵盖与繁殖滨鸟栖息地状况、活鸟计数以及活鸟可见油污程度分级评估相关的数据。每只观测到的鸟类均被划分为无可见油污、微量（≤5%）、轻度（6%~20%）、中度（21%~40%）以及重度（>40%）油污等级。条件允许时，会拍摄观测鸟类的照片。

活鸟可见油污数据的采集方法，与《活鸟油污数据发布汇总报告》（编号B-01v01-02）所规定的数据采集规范一致。

不同观测人员、采集方法、观测点位与时间之间可能存在采样差异。