Seward Line and Lower Cook Inlet Marine Bird Survey Data, 2006-2017, Gulf Watch Alaska Pelagic Component

These data are a component of the Seward Line Long-term Observation Program (http://www.sfos.uaf.edu/sewardline/) which provides observations on the current state of the Northern Gulf of Alaska ecosystem. Ship-based surveys were conducted in the Gulf of Alaska during spring (May) and fall (September) from 2006 to 2016 following standard U.S. Fish and Wildlife Service (USFWS) strip-transect survey protocols. Seabird and marine mammal observations were conducted during daylight hours when the vessel was underway. The dataset is provided in two zip files, one containing each containing comma separated files exported from the marine bird and mammal observation software dLOG (Ford 1999), the other providing calculated bird densities. The dLOG survey files (.csv format) contain the observations of species, numbers, and behavior that were recorded during surveys, in addition to observations of environmental conditions. Processed density files (.csv format), derived from the dLOG survey files, contain marine bird densities (individuals km-2) within 3-km transects. These data are part of the Gulf Watch Alaska (GWA), Gulf Watch Alaska component of the Exxon Valdez Oil Spill Trustee Council (project numbers 12120114-J, 13120114-J, 14120114-J, 15120114-J, and 16120114-J, 17120114-M). Gulf Watch Alaska is the long-term ecosystem monitoring program of the Exxon Valdez Oil Spill Trustee Council for the marine ecosystem affected by the 1989 oil spill.

本数据集为苏厄德航线长期观测计划（Seward Line Long-term Observation Program，http://www.sfos.uaf.edu/sewardline/）的组成部分，该计划旨在监测阿拉斯加湾北部生态系统的当前状况。2006年至2016年的春季（5月）与秋季（9月），研究团队依照美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service, USFWS）的标准带状样带调查规程，在阿拉斯加湾开展了船基调查。海鸟与海洋哺乳动物的观测工作均在船舶航行时段的日间开展。本数据集以两个压缩包形式提供：其中一个压缩包包含从海鸟与海洋哺乳动物观测软件dLOG（Ford 1999）导出的逗号分隔文件（.csv格式），另一个压缩包则包含经计算得到的海鸟密度数据。dLOG调查文件（.csv格式）记录了调查期间观测到的物种、个体数量与行为信息，同时还包含环境条件观测数据。基于dLOG调查文件生成的经处理密度文件（.csv格式）则记录了3公里样带内的海洋鸟类密度（单位：个体/平方千米）。本数据集同时属于阿拉斯加海湾观测计划（Gulf Watch Alaska, GWA），该计划为埃克森瓦尔迪兹溢油赔偿受托人委员会下设的分支项目，对应项目编号为12120114-J、13120114-J、14120114-J、15120114-J、16120114-J及17120114-M。阿拉斯加海湾观测计划是埃克森瓦尔迪兹溢油赔偿受托人委员会针对1989年溢油事故影响的海洋生态系统所设立的长期生态监测项目。