Dall's and Harbor Porpoise Survey Data, Prince William Sound, Alaska: 2007-2008, 2011-2015, and 2017-2023, Gulf Watch Alaska Pelagic Component

These data are part of the Gulf Watch Alaska (GWA) Pelagic component, which is a long-term ecosystem monitoring program of the Exxon Valdez Oil Spill Trustee Council for the marine ecosystem affected by the 1989 oil spill. As part of a larger study of humpback whale (Megaptera novaeangliae) impact to Pacific herring (Clupea pallasi) populations in Prince William Sound (PWS), Dall's porpoise (Phocoenoides dalli) and Harbor porpoise (Phocoena phocoena) observations were recorded during boat-based whale surveys. Pacific herring in PWS have been classified as "not-recovered" by the Exxon Valdez Oil Spill Trustee Council (EVOSTC). Predation by marine mammals has been cited as a factor in the failure of this population to rebound. Following protocols established during the winters of 2007/08 and 2008/09 (EVOSTC project PJ090804), the seasonal trends and abundance of humpback whales in PWS were examined. During these surveys, incidental observations of porpoise were also recorded. The dataset is a single comma-separated values (csv) file containing the date, time, location, number, and behavior of porpoise observed during humpback whale surveys in Prince William Sound, Alaska from 2007-2008, 2011-2015, and 2017-2023.

本数据集隶属于阿拉斯加海湾观察（Gulf Watch Alaska, GWA）远洋监测组分，该项目是埃克森·瓦尔迪兹溢油信托理事会（Exxon Valdez Oil Spill Trustee Council, EVOSTC）针对1989年溢油影响海域开展的长期生态系统监测计划。作为针对威廉王子湾（Prince William Sound, PWS）内座头鲸（Megaptera novaeangliae）对太平洋鲱（Clupea pallasi）种群影响的大型研究子课题，研究团队在船基鲸类调查过程中，同步记录了达尔氏鼠海豚（Phocoenoides dalli）与港湾鼠海豚（Phocoena phocoena）的观测数据。威廉王子湾内的太平洋鲱种群已被埃克森·瓦尔迪兹溢油信托理事会（EVOSTC）评定为“未恢复”状态，海洋哺乳动物的捕食被认为是该种群未能实现种群回弹的影响因素之一。本研究遵循2007/2008与2008/2009冬季制定的监测规程（EVOSTC项目编号PJ090804），对威廉王子湾内座头鲸的季节动态与种群丰度展开了调查，同时在上述调查过程中记录了偶然观测到的鼠海豚数据。本数据集为单一逗号分隔值（Comma-Separated Values, CSV）文件，涵盖了2007-2008年、2011-2015年以及2017-2023年期间，在阿拉斯加威廉王子湾开展座头鲸调查时所记录的鼠海豚观测数据，包含观测日期、时间、观测位置、个体数量与行为信息。