First-Ever Comprehensive Global Map of Freshwater Systems Released

May 8, 2008
12:02 PM

CONTACT: World Wildlife Fund / The Nature Conservancy
Virginia Cramer 804-225-9113 x 102

World Wildlife Fund and The Nature Conservancy Release First-Ever Comprehensive Global Map of Freshwater Systems

WASHINGTON, DC – May 8 – Over a decade of work and contributions by more than 200 leading conservation scientists have produced a first-ever comprehensive map and database of the diversity of life in the world’s freshwater ecosystems. The map and associated fish data – a collaborative project between World Wildlife Fund and The Nature Conservancy — are featured in the May issue of the journal BioScience.

Freshwater Ecoregions of the World divides the world’s freshwater systems into 426 distinct conservation units, many of which are rich in species but under increasing pressure from human population growth, rising water use, and habitat alteration. The comprehensive map and database ( are vital tools for conservationists trying to save the world’s freshwater ecosystems.

Among the highlights:

• This is the first study to compile data on freshwater species — including fish, amphibians, crocodiles and turtles — for nearly all of the world’s inland water habitats
• Almost 18,000 species have been mapped and placed into freshwater ecoregions.* This species list includes 13,400 fish, 4,000 amphibians, 300 turtles, and 20 crocodile species and their relatives.
• About half of all freshwater fish are endemic, or found in only one ecoregion.
• Portions of major rivers such as the Amazon, Congo, Ganges, Yangtze, and the rivers and streams of the American Southeast were identified as outstanding for rich fish populations and high endemism (species found nowhere else).
• In addition, several smaller systems that had not been identified in previous global assessments, such as Congo’s Malebo Pool, the Amazon’s western piedmont, and Cuba and Hispaniola, were determined to have high numbers of endemic fish species.
• Excessive water use for agriculture, industry, drinking and livestock are placing freshwater ecosystems in 55 ecoregions under high stress, threatening the species and habitats.
• In another 59 ecoregions more than 50 percent of their area has already been converted from natural habitats to cropland and urban areas.

“Freshwater ecosystems are the least studied parts of our natural world – they are like vast unexplored libraries, brimming with information,” said World Wildlife Fund’s Robin Abell, who headed the study. “Freshwater Ecoregions of the World allows scientists and non-scientists alike to gain a better understanding of this world and help guide efforts to save these systems and species before they are lost.”

Freshwater habitats support more than 100,000 species and provide humans with critical services such as drinking water and fisheries. Yet freshwater habitats and species are among the most imperiled in the world and have often been left out of large-scale conservation planning.
Until now there were no data on global freshwater biodiversity synthesized in a way that was useful to conservation. Collected research tended to focus only on major rivers or select hotspots, leaving out many other freshwater systems. Plus, information was not easy to access and search. As a result, it has been difficult to gain a truly comprehensive understanding of patterns of freshwater biodiversity across the globe.
The Freshwater Ecoregions of the World (FEOW) project was created to address this need. This extensive and easily searchable resource now provides access to information that can help ensure freshwater systems are well understood, promoted and protected.

The Nature Conservancy’s Carmen Revenga said Freshwater Ecoregions of the World could not have come at a more important time as competition for freshwater resources increases around the world. “Our lack of knowledge of freshwater species has hindered our efforts to conserve rivers, lakes and wetlands around the world. Simply having a map that shows areas rich in freshwater species will help us set conservation priorities and begin to put a face to these unique and essential species, which work to keep our freshwater ecosystems alive and running.”



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