EarthWorks Geospatial Catalog

Evolutionary Significant Unit Boundaries, Steelhead Trout: Russian River, California, 2002

Author(s)
Description
This line shapefile of evolutionary significant unit (ESU) boundaries was compiled from various sources based on written descriptions in National Marine Fisheries Service (NMFS) status reviews (available upon request) and mapping provided by NMFS. An Evolutionary significant unit, or ESU, of Pacific salmon is considered to be a "distinct population segment" and thus a "species" under the Endangered Species Act. Initial boundaries were derived from USGS 1:250,000 scale hydrologic unit boundaries. Drainage basin delineation from blockages was based on 1:100,000 stream hydrography and/or and available digital topography(1:250,000). Species do not necessarily inhabit all drainages or river reaches depicted.This dataset includes evolutionary significant unit (ESU) boundaries depicting major basins within the current known range of each ESU, and were modified based on migration blockages and known fish distribution.
Publisher
Circuit Rider Productions
Place(s)
Sonoma County (Calif.), Mendocino County (Calif.), and Russian River Watershed (Calif.)
Subject(s)
Steelhead (Fish), Environment, and Inland Waters
Held by
Stanford
More details at
Use and reproduction
These data are licensed by Stanford Libraries and are available to Stanford University affiliates only. Affiliates are limited to current faculty, staff and students. These data may not be reproduced or used for any purpose without permission. For more information please contact brannerlibrary@stanford.edu.
Copyright
Copyright ownership resides with the originator.