Role of the Global Ecoregions and how they are selected
By selecting outstanding examples of each ecoregion type, from each biogeographic realm and ocean basin, the Global Ecoregions analysis ensures balance and representation in a global biodiversity strategy.
Other less biologically diverse areas are also critical components of a global strategy. Tundra, tropical lakes, mangroves, temperate broadleaf forests all are unique expressions of biodiversity. Although they may not support the rich species assemblages seen in tropical rainforestsor coral reefs, they contain biological communities adapted to distinct environmental conditions and reflect different evolutionary histories. To lose examples of these communities would represent an immeasurable loss to future generations.
The Methodology for Selecting The Global EcoregionsThe Global Ecoregions are the results of regional analyses of biodiversity across the continents and oceans of the world, completed in collaboration with hundreds of regional experts worldwide and by conducting extensive literature reviews.
These ecoregions were chosen from outstanding examples of each terrestrial, freshwater, and marine major habitat type. The 26 major habitat types describe different areas of the world that share similar environmental conditions, habitat structure, and patterns of biological complexity, and that contain similar communities and species adaptations.
In order to represent the unique fauna and flora of the world's continents and ocean basins, each major habitat type was further subdivided by 7 biogeographic realms (Afrotropical, Australasia, Indo-Malayan, Nearctic, Neotropical, Oceania, Palearctic).
Finally, ecoregions that represented the most distinctive examples of biodiversity for a given major habitat type were identified within each biogeographic realm. They were chosen based on the following parameters:
- species richness
- higher taxonomic uniqueness (e.g., unique genera or families, relict species or communities, primitive lineages)
- extraordinary ecological or evolutionary phenomena (e.g., extraordinary adaptive radiations, intact large vertebrate assemblages, presence of migrations of large vertebrates)
- global rarity of the major habitat type
...the Global Ecoregions initiative [is] the most comprehensive strategy to date for the conservation of the world's biodiversity. The ecoregions, representing a wide range of terrestrial, marine, and aquatic habitats, were selected with a valuable new set of multiple criteria worthy of adoption by other scientists and conservation professionals.
Dr. E.O. Wilson, Pellegrino University Professor, Harvard University
The Global Ecoregions map marks an important contribution to the cause of conserving the world's biological diversity. I attach great importance to international action on this issue, for it is a quintessentially global challenge: no country is immune from the effects of biodiversity loss, and no country can do without the benefits of cooperation in combatting the threats that we face."
Kofi A. Annan, Secretary-General of the United Nations