Habitat--Offshore of Refugio Beach, California

This part of SIM 3319 presents the habitat map of the seafloor (see sheet 7) offshore of Refugio Beach, California (vector data file is included in "Habitat_RefugioBeach.zip," which is accessible from http://pubs.usgs.gov/ds/781/OffshoreRefugioBeach/data_catalog_OffshoreRefugioBeach.html). Using multibeam echosounder (MBES) bathymetry and backscatter data, potential marine benthic habitat maps were constructed. The habitats were based on substrate types and documented or "ground truthed" using underwater video images and seafloor samples obtained by the USGS. These maps display various habitat types ranging from flat, soft consolidated sediment-covered seafloor to hard, deformed (folded) or highly rugose and differentially eroded bedrock exposures. Rugged, high relief rocky outcrops that have been eroded to form ledges and small caves are ideal habitat for rockfish (Sebastes spp.) and other bottom fish such as lingcod (Ophiodon elongatus). Habitat maps will be presented in a map format generated in a GIS (ArcMap) and both digital and hard copy versions will be produced.本数据集SIM 3319的此部分展示了美国加利福尼亚州雷富吉奥海滩（Refugio Beach）近海的海底生境地图（详见第7幅图），其矢量数据文件收录于"Habitat_RefugioBeach.zip"压缩包中，可通过http://pubs.usgs.gov/ds/781/OffshoreRefugioBeach/data_catalog_OffshoreRefugioBeach.html获取。研究团队利用多波束测深声呐（multibeam echosounder, MBES）水深地形数据与后向散射数据，构建了潜在海洋底栖生境（marine benthic habitat）地图。该生境分类基于底质类型，并通过美国地质调查局（USGS）获取的水下视频影像与海底样品完成实地验证。本地图涵盖从覆盖平坦松软固结沉积物的海底，到坚硬、褶皱变形或高度崎岖且经差异侵蚀的基岩露头在内的多样生境类型。那些经侵蚀形成岩架与小型洞穴的高起伏崎岖岩石露头，是平鲉属（Sebastes spp.）以及蛇鳕（Ophiodon elongatus）等底层鱼类的理想栖息生境。该生境地图将以地理信息系统（Geographic Information System, GIS）的ArcMap平台生成的地图格式呈现，同时提供数字化版本与纸质印刷版本。