![]() ![]() This poster is a collaborative project between the U.S. There are 7 level III ecoregions and 51 level IV ecoregions in Arizona and many continue into ecologically similar parts of adjacent states (Bryce and others, 2003 Chapman and others, 2006 Griffith and others, 2006, 2014 and Woods and others, 2001). Explanations of the methods used to define the USEPA's ecoregions are given in Omernik (1995, 2004), Omernik and others (2000), and Gallant and others (1989).Īrizona contains arid deserts and canyonlands, semiarid shrub- and grass-covered plains, woodland- and shrubland-covered hills, lava fields and volcanic plateaus, forested mountains, glaciated peaks, and river alluvial floodplains. ![]() Level IV is a further subdivision of level III ecoregions. At level III, the continental United States contains 104 ecoregions and the conterminous United States has 85 ecoregions (USEPA, 2013). Level II divides the continent into 50 regions (Commission for Environmental Cooperation Working Group, 1997, map revised 2006). Level I is the coarsest level, dividing North America into 15 ecological regions. The relative importance of each characteristic varies from one ecological region to another regardless of the hierarchical level.Ī Roman numeral hierarchical scheme has been adopted for different levels of ecological regions. These phenomena include geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. The approach used to compile this map is based on the premise that ecological regions can be identified through the analysis of the spatial patterns and the composition of biotic and abiotic phenomena that affect or reflect differences in ecosystem quality and integrity (Wiken, 1986 Omernik, 1987, 1995). It revises and subdivides an earlier national ecoregion map that was originally compiled at a smaller scale (United States Environmental Protection Agency, 2013 Omernik, 1987). The Arizona ecoregion map was compiled at a scale of 1:250,000. These general purpose regions are critical for structuring and implementing ecosystem management strategies across federal agencies, state agencies, and nongovernment organizations that are responsible for different types of resources within the same geographical areas (Omernik and others, 2000). By recognizing the spatial differences in the capacities and potentials of ecosystems, ecoregions stratify the environment by its probable response to disturbance (Bryce and others, 1999). Level III Ecoregions of Arizona-page size 8.5"X 11"(5.8 mb)Įcoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources they are designed to serve as a spatial framework for the research, assessment, management, and monitoring of ecosystems and ecosystem components. Level III Ecoregions of Arizona-page size 8.5"X 11"(5.8 mb).Level III and IV Ecoregions of Arizona-19" X 27.5" (9.6 mb).Summary Table: Characteristics of Level IV Ecoregions of Arizona-poster back side 46" X 36" (310 kb).Level III and IV Ecoregions of Arizona-poster front side 46" X 36" (25.9 mb).Instructions for applying symbology to ecoregions.Arizona Level IV Metadata and Arizona Level IV Symbology.Arizona Level III Metadata and Arizona Level III Symbology.To make sure you are using the most current ecoregion data, download shapefiles of ecoregions.Īrizona GIS data (shapefiles, metadata and symbology) If you do not find a link to a state that has been completed, maps and GIS data are available on the Ecoregion FTP site and web content will be available shortly. ![]() Some Web content for Level IV Ecoregions is under construction. Additionally, each state section contains links to downloadable maps in PDF format, and files containing GIS datasets (shapefiles, metadata, and symbology data). Select a state for descriptive information about that state's Level III and IV ecoregions.
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