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Midwest wetlands almost gone but may still have most species

Wetlands in the Midwest? It may be hard to believe but vast areas of today's Corn Belt used to get so wet that malaria was common. While the remaining wetlands are small and scattered, there's still hope -- new research shows that most of the original species may still survive.

"We often look to other regions of the world as biodiversity hotspots but it is worth noting that some of the most heavily impacted regions such as the Corn Belt should not be written off as biodiversity wastelands," says David Jenkins of the University of Illinois at Springfield, who presents this work with Scott Grissom of Grand Valley State University in Allendale, Michigan, and Keith Miller of the University of Illinois at Springfield in the February issue of Conservation Biology.

In the mid-1800s, much of the Corn Belt Iowa, Illinois, Indiana and Ohio -- was tallgrass prairie that included extensive seasonal wetlands. For instance, ephemeral ponds used to cover about a fifth of Illinois (nearly five million acres) from roughly early spring to mid-summer. By the mid-1900s, about 85% of these wetlands had been drained and converted to agriculture, which is similar to the rate of deforestation in tropical forests today.

To assess the biodiversity of the Midwest's remaining wetlands, Jenkins and his colleagues studied crustaceans in 13 ephemeral ponds near Bluff Springs, Illinois; the ponds were wide and shallow, three feet deep at most. They chose crustaceans because they are usually diverse and are important to these ecosystems. The researchers sampled crustaceans from the ponds every week during the wet seasons of three years. Because there are no good records of the species that lived in Illinois' wetlands historically, the researchers used their findings to extrapolate backwards and estimate how many crustacean species were there originally and how many have gone locally extinct. These estimations were based on the fact that the number of species depends on
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Contact: David Jenkins
Jenkins.David@uis.edu
217-206-7341
Society for Conservation Biology
28-Jan-2003


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