U.S. Forest Service unknown vector digital data Reston, Virginia U.S. Geological Survey https://wildlife.ca.gov/Data/BIOS https://filelib.wildlife.ca.gov/Public/BDB/GIS/BIOS/Public_Datasets/600_699/ds659.zip Freshwater mussels are one of the most imperiled groups of organisms on the planet (Williams et al.1993, Strayer et al.2004, Strayer 2006, R´Egnier et al.2009). Although western freshwater mussels have been declining as well (Taylor 1981, Hovingh 2004), recent surveys have not generally been conducted disallowing any clear indication of current compared to historic distribution and abundance. The California floater mussel, Anodonta californiensis Lea 1852 (Family Unionidae) was designated by the Forest Service as a Regionally Sensitive species in 1999. However, distributions of A. californiensis on public lands in California were poorly defined and taxonomic affinities across the western states were confused because of high genetic variability (Mock et al. 2004). This species has been a C2 candidate species for listing under the Endangered Species Act and is presently given a conservation status designation of "C3Q", meaning that globally there are probably no more than 300 populations in existence and that taxonomic problems preclude accurate assessment of actual conservation status. To address this data gap, surveys for A. californiensis and other Regionally Sensitive species have been conducted since 2001 (Brim Box et al. 2005, Howard 2008, Mock et al. 2010). Based on these earlier surveys, it became apparent that systematic surveys concentrated in specific geographic areas such as individual national forests would yield poor success in finding occupied sites (Howard 2008). Therefore during 2008-09, a strategic survey method was employed by prioritizing and revisiting locatable historic sites and water bodies to enhance chances of locating the dwindling number of extant populations. The purpose of this project was to develop a strategic survey design and to resurvey historical sampling sites (pre-1995) for the freshwater mussel Anodonta californiensis (Figure 1a), a Forest Service Region 5 sensitive aquatic bivalve mollusk. Although two other species belonging to different genera, namely the western pearlshell Magaritifera falcata (Gould, 1850) (Family Margaritiferidae, Figure 1b), and western ridge mussel Gonidea angulata (Lea, 1838) (Family Unionidae, Figure 1b), currently have no federal status, there is a concern that their populations and distributions may be declining (Taylor 1981, Frest and Johannes 1995, Mock et al. 2004, Howard 2008). Therefore, surveys were conducted for these two species also to better define their status as a basis for evaluating whether they warrant any protections. All of these species may co-occur, so a survey targeting the regionally sensitive Anodonta californiensis, was effective in detecting whether the other two species were present. The occupied freshwater mussel sites documented by Howard (2010) in Mussel_Sites_2009_Final.shp were projected onto USGS National Hydrography Dataset (NHD) flowlines in ArcMap. NHD flowline reaches immediately adjacent to occupied freshwater mussel sites in Mussel_Sites_2009_Final.shp were selected and exported in shapefile format (Occupied_mussel_reaches.shp); all the NHD flowline attributes retained. 20080101 20090101 publication date Complete None planned -123.981277 -119.484966 42.014208 36.847046 None Magaritifera falcate Freshwater mussels Anodonta californiensis Gonidea angulata ISO 19115 Topic Category inlandWaters biota environment None Big Lake S.F. Eel River Suisun Marsh Donner Lake San Antonio Creek Lake Del Valle Tule River S.F. Tuolumne River McCloud River Dye Creek Scott River Russian River Clear Lake Fall River Pajaro River Pit River Klamath River Shasta River California Truckee River N.F. Stanislaus River Lost River Hat Creek Napa River Tule Lake Spanish Creek N.F. Tuolumne River S.F. American River San Joaquin River S.F. Pit River W.F. Walker River M.F. Tuolumne River M.F. Feather River Sacramento River Susan River None Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data. The Nature Conservancy Jeanette Howard, Ph.D. (415) 793-2096 jeanette_howard@tnc.org If Dr. Howard can not be contacted as an alternative try: Joseph Furnish, Ph.D. U.S. Forest Service 707-562-8952 jfurnish01@fs.fed.us Citation: - Howard, Jeanette. 2010. Sensitive Freshwater Mussel Surveys in the Pacific Southwest Region: Assessment of Conservation Status. Prepared for USDA Forest Service, 1323 Club Drive, Vallejo, California 9459-1110. Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270 Edited original metadata by adding ISO keywords. Reprojected data into California Teale Albers NAD83. 20100908 California Department of Fish and Game Greg Ewing bios@dfg.ca.gov Restructured attribute table to show the most pertinent information at the beginning. Also, made other minor edits to the metadata. 20130926 California Department of Fish and Wildlife Sophie King BIOS Data Librarian geodata@wildlife.ca.gov Vector String 311 NAD 1983 California Teale Albers 34.0 40.5 -120.0 0.0 0.0 -4000000.0 coordinate pair 0.0001 0.0001 meter D North American 1983 GRS 1980 6378137.0 298.257222101 ds659 Occupied Mussel Reaches [ds659] OBJECTID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. FDate The feature date of the original National Hydrography Dataset (NHD) feature. FCode The feature code of the original National Hydrography Dataset (NHD) flowline. FType The feature type of the original National Hydrography Dataset (NHD) flowline (558 = Artificial Path). ComID Unique numeric identification number for the feature as assigned by the Geological Survey (USGS). Note this value cannot be used as the primary key as a single National Hydrography Dataset (NHD) flowline may be divided into several records though interaction with state borders. ReachCode Unique identifier composed of two parts. The first eight digits are the Cataloging Unit Code as defined by FIPS 103. The next six digits are randomly assigned, sequential numbers that are unique within a Catologing Unit. GNIS_ID Identifiers in the Geographic Names Information System. GNIS_Name Names in the Geographic Names Information System. LengthKM Length of features in kilometers. FlowDir Direction of flow is encoded for networked features. Resolution Numeric U.S. Geological Survey (USGS) value indicating the resolution of the feature. 3 medium 2 high 1 local WBAreaComI The waterbody comID of any National Hydrography Dataset (NHD) waterbodies intersecting the original NHD flowline. Enabled No definition for this field is found in "Standards for National Hydrography Dataset - High Resolution" (USGS 1999). Speculative: this field denotes geographic network compatibility of feature (1 = yes)? Shape_Length Length of feature in internal units. Esri Positive real numbers that are automatically generated. See access and use constraints information. ArcGIS Geodatabase 8.3 tar and uncompress 20231201 The Nature Conservancy Jeanette Howard, Ph.D. (415) 793-2096 jeanette_howard@tnc.org FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time