Montana Fish, Wildlife & Parks 2001 YCT2001Assessment.zipPortland, OregonMontana Fish, Wildlife & Parks, via the StreamNet Data Publishing ServiceMay, B.E., W. Urie, B.B. Shepard, S. Yundt, C. Corsi, K. McDonald, B. Snyder, S. Yekel, and K. Walker. 2003. Range-wide status of Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri): 2001.http://www.streamnet.org/online-data/ids.cfm?id=35&keywords= The distribution and abundance of Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri; YCT) have declined from historical levels over part or all of their l range. For this YCT assessment we used existing information provided by 43 fisheries professionals applied through a consistent methodology to assess the extent of YCT historical range, their current distribution, including genetic status, and evaluated the foreseeable risks to 195 populations designated as conservation populations by management agencies. We estimated that YCT historically occupied about 17,397 miles of habitat in the western U.S. YCT currently occupy an estimated 7,528 miles of historical habitats (43%). Genetic testing has been completed across about 1,880 miles of habitat (25% of occupied habitats), but sample sizes were variable and sample sizes of 25 fish or more (a sample size that likely would detect as little as 1% introgression at alpha = 0.05) made up 27% of the samples. YCT with no evidence of genetic introgression currently occupy about 1,300 stream miles (17%) of habitat. Another 105 miles of currently occupied habitats (1%) contained YCT that were identified as part of a mixed stock where the YCT were not introgressed. We suggest that even though genetic sampling was nonrandom because sampling likely occurred more frequently in YCT populations that appeared non-introgressed, some, if not much, of the habitats currently occupied by YCT with no genetic testing likely support populations that are not introgressed. Approximately 3,000 miles of occupied habitat were identified as containing genetically unaltered YCT based on no record of stocking or by having no hybridizing species present. Much of the habitat currently occupied by YCT was located in designated parks (2%), wilderness areas (19%), and other road-less areas (40%), and almost 70% of habitats currently occupied lie within federally managed lands. A total of 195 separate YCT populations currently occupying 6,346 miles of habitat were designated as conservation populations (84.3% of currently occupied habitat). These conservation populations were spread throughout the historical range, occuring in 35 of the 41 hydrologic units historically occupied by YCT. Most of these conservation populations were judged to be isolets (143 or 73%); however, meta-populations occupied much more of the habitat (5,515 miles or 73%). Of the 195 designated conservation populations, 133 (68%) had at least some component that was tested as genetically unaltered or viewed as being potentially unaltered. Thirty nine populations (20%) consisted of only tested unaltered YCT. More isolet populations were at higher risks due to temporal variability, population size, and isolation than meta-populations, but these isolets were generally at less risk from genetic and disease factors than meta-populations. This assessment clearly shows that YCT currently occupy significant portions of, and are well distributed across, their historical range. The data suggest that genetically unaltered YCT occupy at least 17% and possibly up to 58% of currently occupied habitats (7 to 25% of historical habitats). Conservation population designations suggest that two different conservation management strategies are needed and being implemented to conserve YCT. One strategy concentrates on preventing introgression, disease and competition risks through isolation of YCT, while the other concentrates on preserving meta-population function and multiple lifehistory strategies by connecting occupied habitats. EnglishTaxa: Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) Agencies Involved: USDA Forest Service (USFS) Montana Fish, Wildlife & Parks (MFWP) Montana Cooperative Fishery Research Unit Idaho Department of Fish and Game (IDFG) Wyoming Game and Fish Department StreamNet is a cooperative information management and dissemination project focused on fisheries and aquatic related data in the Columbia River basin and the Pacific Northwest. The project provides a variety of data related to fish resources and maintains the 1:100,000 scale hydrography layer for the Pacific Northwest. Information is available through an on-line database query, interactive maps, direct data download or by custom request. StreamNet receives funding from the Bonneville Power Administration (BPA Project No.: 198810804) and is authorized under the Fish and Wildlife Program of the Northwest Power and Conservation Council. Other organizations provide funding for select project components. Participating agencies contribute significant in-kind services and include: the Oregon Dept. of Fish and Wildlife (ODFW), Washington Dept. of Fish and Wildlife (WDFW), Idaho Dept. of Fish and Game (IDFG), Montana Fish, Wildlife and Parks (MFWP), U.S. Fish and Wildlife Service (USFWS), and the Columbia River Inter-Tribal Fisheries Commission (CRITFC). In addition to the data sets that StreamNet develops and maintains in the central database, StreamNet also provides a service called the "StreamNet Data Store" (http://www.streamnet.org/online-data/datastore.html). The Data Store warehouses data separate from StreamNet's central integrated database, most of which are developed by people outside of the StreamNet project. The data set described here is available from the StreamNet Data Store.We used existing information provided by 43 fisheries professionals applied through a consistent methodology to assess the extent of YCT historical range, their current distribution, including genetic status, and evaluated the foreseeable risks to 195 populations designated as conservation populations by management agencies. 2001 publication date Unknown Unknown -115.321 -109.924 44.939 41.197 biotageneticsintrogressionmileshistoricaldistributionbarriersrisksland managementimpactsrangecurrent distributionabundancestatusenvironmentinlandWatersColumbia basinUpper Snake: Snake headwatersUpper Snake: Snake upperUpper Snake: Snake upper closed basinMontanaIdahoWyoming None Fish and Wildlife Data Manager mailing and physical address Helena MT 59620 Unites States

Montana Fish, Wildlife & Parks, Fisheries Division

1420 E. Sixth Avenue

stcarson@state.mt.us Steve CarsonMontana Fish, Wildlife & Parks, Fisheries Division406-444-7778 Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332 Portland, ORStreamNet Project, Pacific States Marine Fisheries Commission StreamNet 2000 map This is the base hydrography used to map these events. http://www.streamnet.org/pnwr/pnwrhome.html Adobe Portable Document Format (.pdf); Hypertext markup language (.html); Microsoft Access (.mdb); ESRI shape files (.shp, .shx, .dbf); Microsoft Word (.doc) complete data set StreamNet project, Pacific States Marine Fisheries Commission Unpublished Material Online interface The distribution and abundance of Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri; YCT) have declined from historical levels over part or all of their l range. For this YCT assessment we used existing information provided by 43 fisheries professionals applied through a consistent methodology to assess the extent of YCT historical range, their current distribution, including genetic status, and evaluated the foreseeable risks to 195 populations designated as conservation populations by management agencies. Pacific States Marine Fisheries Commission StreamNet Regional GIS Specialist StreamNet Regional GIS Specialist mailing and physical address

205 SE Spokane Street, Suite 100

Portland OR 97202 (503) 595-3100 (503) 595-3232 StreamNetGIS@psmfc.org 9:00 AM - 5:00 PM Tabular data (such as in spreadsheets); Reports / publications winzip 30.3 none Send request to contact IndefinitelyDownloadable data 20070309 Pacific States Marine Fisheries Commission StreamNet Regional GIS Specialist StreamNet Regional GIS Specialist mailing and physical address

205 SE Spokane Street, Suite 100

Portland OR 97202 (503) 595-3100 (503) 595-3232 StreamNetGIS@psmfc.org 9:00 AM - 5:00 PM FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time none none EnglishUnclassifiedhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile 20070309112621002007030615100500FALSE2007010814392600Published{D4753878-4CC5-44A6-A854-59049A1FCD77}{2DCF1457-C853-45F2-AC36-4C3AF8C96A6C}20070309Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332HydroUnit_PNAMP_HUC5935853.8274244918642.99572964357.319859-1046015.4344141-125.584325-109.01666149.13565937.8896791ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\HONU\GIS\GIS_Projects\073_METADATA_Adam\SN_DATA_STORE\DS41_YELLOW_CT_01_ASSESSLocal Area NetworkPersonal GeoDatabase Feature ClassNAD_1927_Lambert_Conformal_Conic2396{3F3BC35C-1DB9-4043-BEA3-623DA58B7C12}