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Spatial Reference:
102100
(3857)
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Spatial Reference:
102100
(3857)
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Spatial Reference:
102100
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Units: esriMeters
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Comments: This ArcGIS Map Package contains information on brook trout occupancy in the southern portion of the brook trout range (PA and south). Fish sample data from a number of state and federal agencies/organizations were used to define patches for brook trout as groups of occupied contiguous catchment polygons from the National Hydrography Dataset Plus Version 1 (NHDPlusV1) catchment GIS layer. After defining patches, NHDPlusV1 catchments were assigned occupancy codes. Then state and federal agencies reviewed patches and codes to verify data accuracy. A similar effort is currently being conducted by the Eastern Brook Trout Joint Venture to develop occupancy data for the remainder of the brook trout range including states of New York, Maine, New Hampshire, Connecticut, Vermont, Massachusetts, Rhode Island, and Ohio.
This ArcGIS Map Package contains data for the entire southern portion of the brook trout range. Additionally, the Map Package includes the same data distributed into data layers for each state. This is intended for users interested in information for a particular state. Layers displaying state boundaries, quadrangle maps, and the brook trout range are also included as spatial references.
The Eastern Brook Trout Joint Venture (EBTJV) is a partnership between state and federal agencies, nongovernmental conservation organizations, and academia. The EBTJV is focused on an effort to protect, restore, and enhance brook trout populations throughout the historic range of the Eastern brook trout. One of the goals of the EBTJV was to produce a catchment level dataset indicating the current distribution of brook trout populations and their perturbations. This dataset is part of the Eastern Brook Trout Joint Venture and is part of a collaborative effort to determine the distribution, status, and perturbations to brook trout throughout their historic native range in the eastern United States. This data will aid in quantifying problems, identifying information gaps, and setting restoration priorities for brook trout.
Subject: This ArcGIS Map Package contains information on brook trout occupancy in the southern portion of the brook trout range (PA and south).
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Keywords: Spatial distribution, Species composition, Natural populations, Population distribution, Population structure, National Hydrography Dataset Plus
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