Grass on the prairie is growing taller because there's now more carbon dioxide in the air. Paradoxically, though, this might be hurting wildlife, because the grass is less nutritious.
go there to study plants, insects, and big animals."In the spring it has a lot of beautiful flowers, it has bison; everybody should go visit and check it out for themselves," says Welti, who is currently a post-doctoral researcher at the University of Oklahoma.Welti and her colleagues noticed that data collected over the past two decades showed the number of grasshoppers declining. Yet it wasn't for lack of food.
each year for the past 20 years or so. Those samples were stored in a shed. When the scientists tested them, they found that, indeed, in more recent years the grass contained lower levels of certain key nutrients, including nitrogen , phosphorus, and potassium.
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