Biogeographic synthesis uncovers 867 distinct ecoregions across global terrestrial biomes, highlighting an essential spatial framework for international biodiversity conservation.
Olson, David M., Dinerstein, Eric, Wikramanayake, Eric D., Burgess, Neil D., Powell, George V. N., Underwood, Emma C., D'Amico, Jennifer A., Itoua, Illanga, Strand, Holly E., Morrison, John C., Loucks, Colby J., Allnutt, Thomas F., Ricketts, Taylor H., Kura, Yumiko, Lamoreux, John F., Wettengel, Wesley W., Hedao, Prashant, Kassem, Kenneth R. (2001): Terrestrial Ecoregions of the World: A New Map of Life on Earth. BioScience 51 (11): 933-938, DOI: 10.1641/0006-3568(2001)051[0933:TEOTWA]2.0.CO;2
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Olson et al. (2001) studied this question.