DUML vessel-based photo-id and biopsy surveys in Onslow Bay CHPT OPAREA 2011-2015

Original provider: Duke University Marine Laboratory Dataset credits: Duke University Marine Laboratory Abstract: The United States (US) Navy proposed constructing an Undersea Warfare Training Range (USWTR) along the US Atlantic coast. One of the proposed sites within the Cherry Point (CHPT) OPAREA is an area of 1,713 km2 in Onslow Bay, 87 km from the coast of North Carolina. As part of the Navy's Atlantic Fleet Training and Testing (AFTT) Monitoring Program, shipboard and aerial line transect surveys were implemented in 2007 to estimate density and document distribution and seasonal residency of marine mammals and sea turtles in the proposed USWTR (see <a href=http://seamap.env.duke.edu/datasets/detail/433>"DUML vessel-based line transect surveys for proposed Onslow Bay USWTR site 2007-2010"</a> dataset). Shipboard line-transect survey methods transitioned to biopsy and photo-identification sampling at the end of April 2011 to address questions of residency and population structure in the CHPT OPAREA. Survey effort was expended along the 200 m depth contour and occasionally around eddies and fronts generated by the Gulf Stream. We are focusing on residency and population structure with our shipboard surveys because we are: (1) obtaining adequate data with which to estimate density from aerial line transect sampling; (2) interested in addressing questions of residency as photo-identification data from Onslow suggest considerable residency in that area despite minimal sampling. Sightings within this dataset are from shipboard photo-ID and biopsy surveys conducted from 2011-2013.原始提供方：杜克大学海洋实验室 数据集归属：杜克大学海洋实验室 摘要： 美国海军提议在美国大西洋沿岸建设水下作战训练靶场（Undersea Warfare Training Range, USWTR）。切里角（Cherry Point, CHPT）作业区域（OPAREA）内的一处候选场址位于北卡罗来纳州沿岸外87公里的昂斯洛湾，面积达1713平方公里。作为海军大西洋舰队训练与测试（Atlantic Fleet Training and Testing, AFTT）监测计划的一部分，项目组于2007年开展船载与航空带状航线调查，以估算该候选USWTR场内海洋哺乳动物与海龟的种群密度，记录其分布特征与季节居留规律，相关详情可参阅数据集《DUML 2007-2010年昂斯洛湾候选水下作战训练靶场场址船载带状航线调查》（链接：http://seamap.env.duke.edu/datasets/detail/433）。 2011年4月末，原船载带状航线调查方法调整为皮肤活检与照片识别采样，以探究CHPT作业区域内的物种居留情况与种群结构。本次调查作业沿200米等深线布设，偶尔也会覆盖墨西哥湾流形成的涡旋与锋面区域。 本次船载调查聚焦物种居留与种群结构，原因如下：其一，可通过航空带状航线调查获取充足数据以估算种群密度；其二，尽管昂斯洛湾区域此前采样规模有限，但现有照片识别数据显示该区域存在大量居留个体，因此我们希望进一步厘清相关居留特性的研究问题。 本数据集收录的目击记录均来自2011-2013年间开展的船载照片识别与皮肤活检调查。