Nonindigenous Aquatic Species (NAS) - USGS [ds731]

This GIS dataset offers a link to the California portion of the Nonindigenous Aquatic Species (NAS) information resource for the United States Geological Survey. The NAS program has been established as a central repository for accurate and spatially referenced biogeographic accounts of nonindigenous aquatic species. The program provides scientic reports, online/realtime queries, spatial data sets, regional contact lists, and general information. The goal of the information system is to provide timely, reliable data about the presence and distribution of nonindigenous aquatic species. The NAS database contains locality information for more than 1100 species of vertebrates, invertebrates, and vascular plants. The NAS program provides a continual national repository of distribution information for nonindigenous aquatic species that is used to gain an understanding of aquatic introductions, identify geographic gaps, and access the status of introduced aquatic species nationwide. Data are obtained from many sources including literature, museums, databases, monitoring programs, state and federal agencies, professional communications, online reporting forms, and Aquatic Nuisance Species (ANS) hotline reports. The NAS program defines a nonindigenous aquatic species as a member(s) of a species that enters a body of water of aquatic ecosystem outside of its historic or native range. This includes not only species that arrived from outside of North America but also species native to North America that have been introduced to drainages outside their ranges within the country. Please visit http://nas.er.usgs.gov for more information and to see all of the products and data available through the NAS program.本地理信息系统（Geographic Information System，GIS）数据集提供了指向美国地质调查局非本土水生物种（Nonindigenous Aquatic Species，NAS）信息资源中加利福尼亚州部分的链接。NAS项目旨在作为非本土水生物种精准且带空间参照的生物地理记录的中央存储库。该项目提供科学报告、在线/实时查询服务、空间数据集、区域联系人清单以及通用资讯。本信息系统的目标是提供关于非本土水生物种存在情况与分布范围的及时、可靠数据。NAS数据库收录了超过1100种脊椎动物、无脊椎动物以及维管植物的分布位点信息。NAS项目持续维护全国性的非本土水生物种分布信息存储库，该库可用于了解水生引种事件、识别地理信息空白，并获取全国范围内外来水生物种的现状信息。数据来源广泛，包括文献资料、博物馆藏品、各类数据库、监测项目、州级与联邦机构、专业交流渠道、在线申报表单以及水生有害物种（Aquatic Nuisance Species，ANS）热线报告。NAS项目将非本土水生物种定义为：进入其历史分布范围或原生分布范围之外的水生生态系统水体的物种类群。这不仅涵盖源自北美以外的物种，还包括原本原产于北美、却被引入至其国内原生分布范围之外的流域的物种。如需了解更多信息或查看NAS项目可提供的全部产品与数据，请访问http://nas.er.usgs.gov。