Loading Publication...

Ecoregional Assessments for Western North America

We collaborated with partners to identify lands & waters critical to the conservation of biodiversity across western North America. Reports and GIS data are now available for 19 desert, mountain, grassland and plateau ecoregions across western North America.

Information to sustain our natural infrastructure

Natural infrastructure consists of our intact lands and waters that preserve wildlife habitat and safeguard species. These lands and waters also provide services for people, such as groundwater recharge, carbon sequestration, and recreational opportunities. They enhance our quality of life and sustain the character of our western landscapes.

Along with partners, The Nature Conservancy has completed a series of ecoregional assessments that identify core habitats within our natural infrastructure across western North America. These places represent the best remaining areas to conserve over 1,000 natural communities and over 3,000 rare, unique and endemic species.

Geographic data to provide conservation solutions

We have compiled a geographic data set which aggregates the information from 19 ecoregional assessments across western North America. The data set enables exploration of our western landscapes to answer questions such as:

  • Which places are most important to conserve?
  • Who manages our species and habitats?
  • Where are the places that support the most species at risk of extinction?
Species or subspecies with a global conservation status of globally critically imperiled, globally imperiled, or designated under the US Endangered Species Act.
Imperiled Species

They can be used with a variety of third-party data sets to evaluate conservation & land management needs and alternative futures that seek to minimize impacts to our natural resources.

Our ecoregional data set for western North America is designed as a file geodatabase for use with ArcGIS Desktop and ArcGIS pro software here. It contains geographic features that represent important lands and waters (conservation areas), tables that link these lands to the species and habitats that occur within them (targets), and relationships that allow a user to navigate from conservation areas to targets, and vice-versa. Or you can view an interactive map of the data here.

Broad scientific collaboration

Ecoregional assessments are comprehensive and systematic efforts to identify conservation priorities. The assessments for western North America evaluated over 1 billion acres during an eight-year study period. Collectively, these assessments involved nearly 700 scientists from 125 government agencies, organizations, tribes, universities, and museums.

Many data sets were used to create the ecoregional assessments, including primary data from the scientific literature, new data collected by subject experts, and region-wide data on species and habitats from NatureServe and its network of natural heritage programs and the GAP Analysis Program.

Related Research
Jan 2008
Ecoregional Assessment
Southwest Regional
Robles, M., Marshall, R., List, M., and C. Enquist
Ecoregional Assessment Geodatabase for Western North America
GIS data set that aggregates the information from 19 ecoregional assessments across western North America into a file geodatabase. This geodatabase contains geographic and tabular information pertaining to priority conservation areas in western North America. The region encompasses a sequence of mou[...]
Ecoregional Assessment
Southwest Regional
The Nature Conservancy
Ecoregional Conservation Assessment Reports
Original reports summarizing the results of the six ecoregional conservation assessments completed for the southwestern U.S. and northwestern Mexico by The Nature Conservancy and partners.[...]
Jul 2006
Ecoregional Assessment
Southwest Regional
Marshall, R., List, M., and C. Enquist
Overview: Ecoregion-Based Conservation Assessments of the SW United States and Northwestern Mexico
Provides an overview of ecoregional assessments and the process used to create a standardized, cross-ecoregional dataset for six ecoregions within and adjacent to Arizona.[...]