Chinook Evolutionarily Significant Units

These data represent the final delineated population boundaries associated with chinook salmon Evolutionarily Significant Units (ESU) for the four recovery domains in the Pacific Northwest. These boundaries were designated by federally-mandated Technical Recovery Teams (TRTs) each covering a recovery domain; Puget Sound, Willamette-Lower Columbia, Interior Columbia, and the Oregon/Northern California Coast. These data represent the geographic extent of individual listed ESU salmonid populations in the Pacific Northwest, typically delineated by the extent of their spawning areas. Determination of spawning extent is dependent on the quality and scale of historic and current surveys and studies; quality and availability of this may vary by TRT region and may be more fully described in the domain-specific metadata narrative citations. Identifying independent populations is a key component of identifying current and future extinction risk, as well as patterns of diversity within and between ESUs. Understanding the extent of historically independent populations, along with abundance and life history information can provide a framework to compare historic and present status and to study limiting factor impacts. These data may be helpful in identifying and prioritizing specific recovery actions within ESUs (e.g., barrier removal). These data may differ substantially from other depictions/data of salmonid populations produced by other entities (e.g., other Federal, tribal, state, and local agencies). These data are intended to be used by federal, tribal, state, and local recovery planners, other co-managers, NGOs and the general public for any activities related to anadromous salmonid recovery and conservation. These data are intended to assist users, but do not constitute the legal description of salmon and steelhead populations listed under the ESA. Users in need of a legal description should instead consult the agency. Every effort has been made to ensure that these data are as accurate as possible. For details regarding the Interior Columbia TRT's methods for delineating independent salmonid populations, and additional products, please see: http://www.nwfsc.noaa.gov/trt/index.cfm FULL FGDC METADATA本数据集涵盖太平洋西北地区四个恢复分区内与奇努克鲑鱼进化显著单元（Evolutionarily Significant Units, ESU）相关的最终划定种群边界。上述边界由联邦授权的技术恢复小组（Technical Recovery Teams, TRTs）划定，每个小组负责一个恢复分区，分别为普吉特湾、威拉米特-下哥伦比亚河、哥伦比亚河内陆区以及俄勒冈/北加州海岸。本数据集明确了太平洋西北地区各列入名录的ESU鲑科鱼类种群的地理范围，此类范围通常以其产卵区域的边界为基准划定。产卵范围的确定取决于历史与当前调查研究的质量与规模，相关资料的质量和可获取性因TRT负责的分区而异，具体细节可参阅各分区专属的元数据叙事引用文档。划定独立种群是评估当前及未来灭绝风险、解析ESU内部及ESU间多样性模式的核心环节。明晰历史上独立种群的分布范围，结合种群丰度与生活史信息，可为对比种群的历史与现状、研究限制因子的影响提供分析框架。本数据集可用于识别ESU内的具体恢复行动并确定其优先级（例如移除洄游障碍设施）。本数据集与其他机构（例如其他联邦机构、部落、州及地方部门）发布的鲑科鱼类种群相关描述或数据可能存在显著差异。本数据集可供联邦、部落、州及地方层面的恢复规划人员、其他共同管理者、非政府组织以及社会公众用于所有与溯河洄游鲑科鱼类恢复及保护相关的工作。本数据集仅用于辅助用户开展工作，并非《濒危物种法案》（Endangered Species Act, ESA）项下列入名录的鲑鱼和硬头鳟种群的法定描述。若用户需要法定描述，应咨询相关主管机构。本数据集已尽最大努力确保数据准确性。如需了解哥伦比亚河内陆区TRT划定独立鲑科鱼类种群的方法及其他相关产品的详细信息，请参阅：http://www.nwfsc.noaa.gov/trt/index.cfm 完整联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据。