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）远洋组分，该组分是埃克森瓦尔迪兹溢油受托人委员会针对1989年溢油影响的海洋生态系统开展的长期生态系统监测项目的一部分。作为一项针对威廉王子湾（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的组成部分，研究人员在乘船开展的鲸类调查过程中，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已被埃克森瓦尔迪兹溢油受托人委员会（Exxon Valdez Oil Spill Trustee Council, EVOSTC）归类为“未恢复”种群。海洋哺乳动物的捕食被认为是该种群未能实现种群恢复的影响因素之一。本研究遵循2007/2008年与2008/2009年冬季制定的规程（埃克森瓦尔迪兹溢油受托人委员会项目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研。在上述调查过程中，研究人员同时记录了偶遇的鼠海豚观测数据。本数据集为单个逗号分隔值（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过程中所观测到的鼠海豚的日期、时间、位置、数量与行为信息。