Identifying Ecoregion Boundaries

  title={Identifying Ecoregion Boundaries},
  author={Robert G. Bailey},
  journal={Environmental Management},
  • R. Bailey
  • Published 2004
  • Geography, Medicine
  • Environmental Management
This article summarizes the rationale I used in identifying ecoregion boundaries on maps of the United States, North America, and the world’s continents, published from 1976 to 1998. The geographic reasoning used in drawing boundaries involves 20 principles, which are presented to stimulate discussion and further understanding. Brief background and references are provided for the principles. 

Figures, Tables, and Topics from this paper

Vegetation science and the ecoregional approach: A proposal for the ecological land classification of Italy
This paper presents the context, methodology and preliminary results of an ecoregionalisation process applied at national scale. Ecoregion delineation was based on robust biophysical stratificationExpand
A first revision of the Italian Ecoregion map
Abstract According to advances in phytogeographic knowledge, a revision of boundaries for the Italian Ecoregions have been made. Main changes relate to the southern and eastern limits betweenExpand
Ecoclimatic Zones of the Earth
The effects of latitude, continental position, and elevation, together with other climatic factors, combine to form the world’s ecoclimatic zones, herein referred to as an ecosystem region, orExpand
Continental Patterns and Boundaries
The zones give only a broad-brush picture. Variations within a zone break up and differentiate the major, subcontinental zones. For example, the vegetation of the savanna is highly differentiatedExpand
Ecoregions of the Conterminous United States: Evolution of a Hierarchical Spatial Framework
The logic underpinning the approach is explained, the evolution of the regional mapping process is discussed, and examples of how the ecoregions were distinguished at each hierarchical level are provided. Expand
Ecoregions in the Southern Balkans: Should Their Boundaries Be Revised?
A regional evaluation of the WFD ecoregion boundaries in Greece and its neighboring Balkan states reveals both a need to reconcile disparate approaches to eCoregion mapping and to promote the development of a new policy-relevant inland waters e coregion framework that would support broad-scale water management and aquatic conservation. Expand
Understanding the Science and Art of Ecoregionalization
Although the need for unique spatial entities—regions—is generally agreed on within the discipline of geography, the philosophy and practice of regionalization—the process of identifying andExpand
Continental Types and Their Controls
The ecoregions on the Earth’s land masses are arranged in predictable patterns and are causally related to macroclimate, i.e., the climate that lies just above the local modifying irregularities ofExpand
Classification and mapping of the ecoregions of Italy
Ecological regions or ecoregions derive from ecological classification of land and represent broad and discrete ecologically homogeneous areas within which natural communities and species interactExpand
Using Bayesian Mixture Models That Combine Expert Knowledge and GIS Data to Define Ecoregions
Ecoregions have evolved from a history of organism–environment interactions, and are delineated at the scale or level of detail required to support planning and are embedded in government policies at multiple scales. Expand


Delineation of ecosystem regions
As a means of developing reliable estimates of ecosystem productivity, ecosystem classification needs to be placed within a geographical framework of regions or zones. This paper explains the basisExpand
Ecoregions of the Conterminous United States
Abstract A map of ecoregions of the conterminous United States has been compiled to assist managers of aquatic and terrestrial resources in understanding the regional patterns of the realisticallyExpand
: In an effort to adopt more holistic ecosystem approaches to resource assessment and management, many state and federal agencies have begun using watershed or ecoregion frameworks. Although fewExpand
Map Supplement Ecoregions of the Conterminous United States
A map of ecoregions of the conterminous United States has been compiled to assist managers of aquatic and terrestrial resources in understanding the regional patterns of the realistically attainableExpand
Ecoregions as a level of ecological analysis
There have been many attempts to classify geographic areas into zones of similar characteristics. Recent focus has been on ecoregions. We examined how well the boundaries of the most commonly usedExpand
Problems with using overlay mapping for planning and their implications for geographic information systems
Computer-assisted mapping technology is applied to making overlay maps, however, the resultant maps may be so inaccurate or unable to capture significant units of productivity and ecological response that they could lead to imperfect or false conclusions. Expand
A world ecoregions map for resource reporting
An international project is proposed to create a map showing the world subdivided into macroecosystem regions within each of which ecological conditions are relatively uniform but which show certainExpand
Ecological land classification: A survey approach
A landscape approach to ecological land mapping, as illustrated in this article, proceeds by pattern recognition based on ecological theory. The unit areas delineated are hypotheses that arise from aExpand
A hierarchical approach to ecosystems and its implications for ecological land classification
This article proposes a nomenclature for hierarchical ecosystem classification based on common practice in ecological land classification and considerations on comprehensiveness which is inspired on and closely follows the Canadian terminology, but incorporating some frequently used European concepts. Expand
Developing a Spatial Framework of Common Ecological Regions for the Conterminous United States
The origin, capabilities, and limitations of three major federal agency frameworks and why a common ecological framework is desirable are described and a proposed process for development of the common framework is presented. Expand