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Three level I areas were not subdivided for level 2. [2] Level III subdivides the continent into 182 smaller ecoregions; of these, 104 lie partly or wholly with the United States. [1] [3] Level IV is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States.
Pages in category "Ecoregions of Nebraska" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. C. Corn Belt; H.
"Level I" divides North America into 15 broad ecoregions. "Level II" subdivides the continent into 52 smaller ecoregions. "Level III" subdivides those regions again into 182 ecoregions. [1] [2] "Level IV" is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States.
Ecoregions of Nebraska (5 P) Pages in category "Regions of Nebraska" The following 8 pages are in this category, out of 8 total.
Terrestrial Ecoregions of the World (Olson et al. 2001, BioScience) WWF terrestrial ecoregions of the world One way of mapping the world into 18 terrestrial vegetation biomes, each containing one or more ecoregions EPA level III ecoregions in the contiguous United States. Alaska ecoregions (102-120) not shown.
Ecologically, the EPA includes the Cross Timbers as part of the vast Great Plains, which comprise Level I Ecoregion 9.0, stretching from central Alberta in Canada to northern Mexico. [6] More specifically, the Cross Timbers fall into Level II Ecoregion 9.4, the smaller South Central Semi-Arid Plains. [ 7 ]
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the five inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF). The United States is a megadiverse country with a high level of endemism across a wide variety of ecosystems.