Omernik's Ecoregion Framework: a Legacy for Understanding Regional Patterns in Attainable Resource Quality

Area of Science:

• Ecological sciences
• Environmental management
• Geographic information systems

Background:

• Omernik's 1987 ecoregions map provided a comprehensive ecological framework for the conterminous United States.
• This seminal paper is the most-cited publication in the Annals of the American Association of Geographers.

Purpose of the Study:

• To assess and quantify the scientific contribution and impact of Omernik's 1987 ecoregions paper.
• To analyze temporal and spatial citation trends, application scope (environments and organisms), and primary uses of the ecoregions framework.

Main Methods:

• A scientometric analysis was conducted to examine citation patterns.
• Bibliographic data were analyzed to determine the temporal and spatial distribution of citations.
• Thematic analysis was performed on citing articles to identify application areas and environments.

Main Results:

• Citations show a positive temporal trend, indicating sustained relevance 36 years post-publication.
• The framework is predominantly applied to aquatic environments, particularly streams, within the United States.
• Key applications include delineating study sites, selecting reference sites, and assessing biotic/abiotic patterns.

Conclusions:

• Omernik's ecoregions provide a valuable, generalizable framework for regional ecological assessment and management.
• The framework facilitates communication of ecological patterns to scientists, policymakers, and the public.
• Its comprehensiveness ensures continued widespread applicability across diverse scientific and management disciplines.