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**Symbology has been adjusted by the Open Space Institute from The Nature Conservancy's original "Geophysical Settings, 2016 Eastern U.S. and Canada" dataset.** The geophysical settings are defined by their physical properties – geology, soil, and elevation - that correspond to differences in the flora and fauna they support. They also differ in ecological character, in their value for agriculture or mining, and how they have been developed by people. For example, the region’s high granite mountains are both largely intact and topographically complex, whereas low coastal sandplains are both more fragmented and relatively flat. The geophyical settings classification enabled us to compare resilience characteristics...
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Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987).
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In 2013, the first of several Regional Stream Quality Assessments (RSQA) was done in the Midwest United States. The Midwest Stream Quality Assessment (MSQA) was a collaborative study by the U.S. Geological Survey (USGS) National Water Quality Assessment (NAWQA), the USGS Columbia Environmental Research Center, and the U.S. Environmental Protection Agency (USEPA) National Rivers and Streams Assessment (NRSA). One of the objectives of the RSQA, and thus the MSQA, is to characterize the relationships between water-quality stressors and stream ecology and to determine the relative effects of these stressors on aquatic biota within the streams (U.S. Geological Survey, 2012). To meet this objective, a framework of fundamental...
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This data set shows Level I, II, and III ecological regions (ecoregions) of North America, and is an update and revision of files developed by Canada, Mexico, and the United States of America in the late 1990’s in a cooperative project for the Commission for Environmental Cooperation (CEC). These revised ecological regions were developed in a meeting between representatives of the three nations and CEC in April 2006 in Newport, Oregon. Ecoregions are areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. The ecoregions in this data set are based on the premise that a hierarchy of ecological regions can be identified through the analysis of the patterns and...
This map shows the location of EPA Level IV Ecoregions in the Colorado Plateau Ecoregion.
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The second edition of "Ecoregions of Montana" (2002) revises many ecoregion polygon assignments that appeared in the first edition (Woods and others, 1999). These changes were made after research in Idaho (McGrath and others, 2002) recognized the Idaho Batholith as a separate level III ecoregion (Ecoregion 16), limited the Northern Rockies (15) to strongly marine-influenced areas, and transferred the Montana Valley and Foothill Prairies (formerly Ecoregion 16) to another level III ecoregion, the Middle Rockies (17). The second edition also modifies a few level IV ecoregion lines along Montana's western border so that ecoregions shared by Montana and Idaho will edge match. In addition, it updates ecoregion...
Terrestrial Ecosystems of the World (TEOW), version 2.0, published by the World Wildlife Fund. Citation: Olson, D. M., Dinerstein, E., Wikramanayake, E. D., Burgess, N. D., Powell, G. V. N., Underwood, E. C., D'Amico, J. A., Itoua, I., Strand, H. E., Morrison, J. C., Loucks, C. J., Allnutt, T. F., Ricketts, T. H., Kura, Y., Lamoreux, J. F., Wettengel, W. W., Hedao, P., Kassem, K. R. 2001. Terrestrial ecoregions of the world: a new map of life on Earth. Bioscience 51(11):933-938. From metadata: This map depicts the 825 terrestrial ecoregions of the globe. Ecoregions are relatively large units of land containing distinct assemblages of natural communities and species, with boundaries that approximate the original...
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This multi-tiered, broad-scale, hierarchical system of ecoregions is based on numerous environmental variables at each level. The first two tiers are based on climate, followed by climate and physiograpghy, and finally topography and soils. This data was used to provide a general description of the ecosystem geography.
Ecoregions of the United States, developed by Robert G. Bailey of the Forest Service Inventory and Monitoring Institute. From metadata: this data set shows ecoregions, which are ecosystems of regional extent, in the United States, Puerto Rico, and the U.S. Virgin Islands. Four levels of detail are included to show a hierarchy of ecosystems. The largest ecosystems are domains, which are groups of related climates and which are differentiated based on precipitation and temperature. Divisions represent the climates within domains and are differentiated based on precipitation levels and patterns as well as temperature. Divisions are subdivided into provinces, which are differentiated based on vegetation or other natural...
Categories: Data; Types: Downloadable, Map Service, Shapefile; Tags: Alabama, Alaska, Arizona, Arkansas, Bailey’s ecoregions, All tags...


    map background search result map search result map North America Ecological Regions Ecoregions of Montana Colorado Plateau REA EPA Level IV Ecoregions Bailey's Ecoregions of the Conterminous United States Aquatic Ecoregions of the Conterminous United States Study Boundary for the U.S. Geological Survey Midwest Stream Quality Assessment Geophysical Settings, 2016 Eastern U.S. and Canada Mean Annual Population Growth Rate and Ratio Change in Abundance of Common Raven within Level I Ecoregions of the United States and Canada, 1966 - 2018 Mean Annual Population Growth Rate and Ratio Change in Abundance of Common Raven within Level II Ecoregions of the United States and Canada, 1966 - 2018 Colorado Plateau REA EPA Level IV Ecoregions Ecoregions of Montana Study Boundary for the U.S. Geological Survey Midwest Stream Quality Assessment Geophysical Settings, 2016 Eastern U.S. and Canada Aquatic Ecoregions of the Conterminous United States Bailey's Ecoregions of the Conterminous United States Mean Annual Population Growth Rate and Ratio Change in Abundance of Common Raven within Level I Ecoregions of the United States and Canada, 1966 - 2018 Mean Annual Population Growth Rate and Ratio Change in Abundance of Common Raven within Level II Ecoregions of the United States and Canada, 1966 - 2018 North America Ecological Regions