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but Wright said it's over a much smaller area.
• "And we're not talking about a pristine landscape like a Brazilian rainforest," Wright said.
• The researchers say that high corn and soybean prices, prompted largely by demand for biofuel feedstocks, are driving the change. Growers groups say the increased demand for their crops is also spurred by the rising international need for protein sources, and American farmers are doing all they can to keep up with the skyrocketing demand.
• The analysis identifies areas with elevated rates of grass-to-corn and grass-to-soy conversion, ranging from 1 percent to 5.4 percent annually. Grassland conversion between 2006 and 2011 was mostly concentrated in North Dakota and South Dakota, east of the Missouri River.
• In Minnesota and the Dakotas, this expansion was concentrated near wetlands, posing a threat to waterfowl breeding habitats.
• The percentages don't appear large during a single year, but when they accumulate over a longer period, it could mean the loss of hundreds of thousands of acres, said Eric Lindstrom, a Bismarck, N.D.-based government affairs representative for Ducks Unlimited.
• "We've been very concerned about the accelerated loss of native prairie," Lindstrom said.
• The conservation organization is supporting the Protect Our Prairies Act, a U.S. House bill introduced last week by Rep. Kristi Noem, R-S.D., and Tim Walz, D-Minn.
• The bill would conserve native grasslands by reducing crop insurance for the first four years on newly broken native sod or grasslands.
• Ducks Unlimited also would like federal crop insurance subsidies based on the productivity of the land versus incentivizing wetland drainage and habitat destruction.
• In their study, the South Dakota State researchers found some differing trends when looking at state-level data.
• In the Dakotas and Minnesota, grassland conversion was concentrated on relatively high-quality land, suggesting that land owners are seeking higher rates of return by moving from livestock ranching to growing corn and soybean.
• In Minnesota, the researchers found that much of the grassland conversion was on lands with excessive wetness, pointing to a likely increase in the use of man-made drainage systems.
• Grassland conversion in Iowa was concentrated on less suitable land, likely reflecting a relative lack of higher quality land available for growing more corn and

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