Assessment of Wild Trout Populations in Blair Gap Run, Allegheny Portage Railroad National Historic Site

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Assessment of Wild Trout Populations in Blair Gap Run, Allegheny Portage Railroad National Historic Site National Park Service U.S. Department of the Interior Northeast Region Philadelphia, Pennsylvania Assessment of Wild Trout Populations in Blair Gap Run, Allegheny Portage Railroad National Historic Site Natural Resources Technical Report NPS/NER/NRTR­­2006/067 ON THE COVER Introduced brown trout (Salmo trutta, top) and native brook trout (Salvelinus fontinalis, bottom) from Blair Gap Run, Allegheny Portage Railroad National Historic Site. Photographs by Caleb Tzilkowski Assessment of Wild Trout Populations in Blair Gap Run, Allegheny Portage Railroad National Historic Site Technical Report NPS/NER/NRTR­2006/067 Caleb J. Tzilkowski 1 and Scott A. Sheeder 2 1In stitutes of the Environment, Forest Resources Building The Pennsylvania State University University Park, PA 16802 2In stitutes of the Environment, Land and Water Research Building The Pennsylvania State University University Park, PA 16802 November 2006 U.S. Department of the Interior National Park Service Northeast Region Philadelphia, Pennsylvania The Northeast Region of the National Park Service (NPS) comprises national parks and related areas in 13 New England and Mid­Atlantic states. The diversity of parks and their resources are reflected in their designations as national parks, seashores, historic sites, recreation areas, military parks, memorials, and rivers and trails. Biological, physical, and social science research results, natural resource inventory and monitoring data, scientific literature reviews, bibliographies, and proceedings of technical workshops and conferences related to these park units are disseminated through the NPS/NER Technical Report (NRTR) and Natural Resources Report (NRR) series. The reports are a continuation of series with previous acronyms of NPS/PHSO, NPS/MAR, NPS/BSO­RNR, and NPS/NERBOST. Individual parks may also disseminate information through their own report series. Natural Resources Reports are the designated medium for information on technologies and resource management methods; "how to" resource management papers; proceedings of resource management workshops or conferences; and natural resource program descriptions and resource action plans. Technical Reports are the designated medium for initially disseminating data and results of biological, physical, and social science research that addresses natural resource management issues; natural resource inventories and monitoring activities; scientific literature reviews; bibliographies; and peer­reviewed proceedings of technical workshops, conferences, or symposia. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the National Park Service. This report was accomplished under Cooperative Agreement H4560030064 Task Agreement 16 with assistance from the NPS. The statements, findings, conclusions, recommendations, and data in this report are solely those of the author(s), and do not necessarily reflect the views of the U.S. Department of the Interior, National Park Service. Print copies of reports in these series, produced in limited quantity and only available as long as the supply lasts, or preferably, file copies on CD, may be obtained by sending a request to the address on the back cover. Print copies also may be requested from the NPS Technical Information Center (TIC), Denver Service Center, PO Box 25287, Denver, CO 80225­0287. A copy charge may be involved. To order from TIC, refer to document D­105. This report may also be available as a downloadable portable document format file from the Internet at http://www.nps.gov/nero/science/. Please cite this publication as: Tzilkowski, C. J., and S. A. Sheeder. June 2006. Assessment of Wild Trout Populations in Blair Gap Run, Allegheny Portage Railroad National Historic Site. National Park Service, Northeast Region. Philadelphia, PA. Natural Resources Report NPS/NERCHAL/NRR­2006/067. NPS D­105 November 2006 ii Table of Contents Page Figures ...................................................................................................................................... v Tables ..................................................................................................................................... vii Executive Summary ................................................................................................................. ix Introduction .............................................................................................................................. 1 Current Management of Blair Gap Run ............................................................................. 1 Methods .................................................................................................................................... 7 Results ...................................................................................................................................... 9 Discussion ............................................................................................................................... 13 Implications for Management of Blair Gap Run Trout Populations ................................. 14 Implications for Blair Gap Run Water Quality Regulation .............................................. 16 Management Recommendations .............................................................................................. 17 Literature Cited ....................................................................................................................... 19 iii Figures Page Figure 1. Pennsylvania Fish and Boat Commission management designations of Blair Gap Run within and adjacent to Allegheny Portage Railroad National Historic Site. Color­coded fish sampling site markers denote where brook and brown trout were captured during 2005 and 2006 whereas numbered sites (1­5) correspond to sites surveyed during this study. ATW = Approved Trout Water, SWTP = Stream Sections that Support Wild Trout Production. ................................................................................................. 2 Figure 2. Pennsylvania Department of Environmental Protection (PADEP) designated protected uses of Blair Gap Run within and adjacent to Allegheny Portage Railroad National Historic Site. Color­coded fish sampling site markers denote where brook and brown trout were captured during 2005 and 2006 whereas numbered sites correspond to sites surveyed during this study. CWF = Cold Water Fishes; TSF = Trout Stocking........................................ 5 Figure 3. Wild­spawned brook trout from Blair Gap Run (BGR) headwaters (top left), wild spawned brown trout from downstream limit of ALPO property (top right), and wild spawned brook trout and brown trout from BGR near its confluence with Blair Run (bottom). .......................................................... 10 Figure 4. Average (+ 1 SE) density (individuals/m 2) of brook and brown trout in Blair Gap Run and two other central Pennsylvania streams (Lingle Run, Tomtit Run) that were classified as mixed wild brook and brown trout fisheries by the Pennsylvania Fish and Boat Commission. ............................................... 15 v Tables Page Table 1. Biomass criteria used by the Pennsylvania Fish and Boat Commission for assignment of Class A Wild Trout Water designations (PAFBC 1997). All criteria within subcategories must be met to receive designation. ............................................................................................................................... 4 Table 2. Pennsylvania alkalinity, dissolved oxygen (DO), and pH criteria for the protection of aquatic life (PADEP, 2003). Water quality parameter, protected use, and criteria are presented. Aquatic life protected uses include Cold Water Fishes (CWF), Trout Stocking (TSF), Warm Water Fishes (WWF), and Migratory Fishes (MF). .................................................................... 4 Table 3. Surveyed Blair Gap Run location descriptions (downstream limit), dimensions, and locations (UTM coordinates). ............................................................... 8 Table 4. Number of brook trout and brown trout individuals (I) captured and estimates of trout density (D = individuals/m 2) at five Blair Gap Run sites upstream of Blair Run. .................................................................................................... 11 Table 5. Chemical characteristics of stream reaches surveyed for trout densities in Blair Gap Run upstream of Blair Run. T = water temperature, DO = dissolved oxygen. ...................................................................................... 11 vii Executive Summary The National Park Service (NPS) has an interest in preserving native brook trout in sections of Blair Gap Run (BGR) that occur on Allegheny Portage Railroad National Historic Site (ALPO) property. During a recent survey (Sheeder and Tzilkowski 2006), brook trout, and not brown trout were captured on ALPO property above the Blair Gap Reservoir, whereas both species were captured on ALPO property downstream of the reservoir. Those results suggested that the impoundment provided a barrier to upstream migration of nonnative brown trout. Electrofishing surveys were conducted at five sites in BGR near ALPO to assess wild trout populations upstream of the BGR confluence with Blair Run. The primary intent of this survey was to determine the upstream limit of brown trout in BGR. The five sampled sites were located on a section of BGR owned by the Altoona City Water Authority between BGR sections that flow
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