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Climate change creates dramatic decline in red-winged black bird population

g insects to eating corn and have caused millions of dollars of damage.

Red-winged black birds feed on corn borers, so that makes them well-liked by farmers, until they switch in the breeding season to eating corn. That's when the hero suddenly becomes the pest.

So, is the 50 percent decline in population a good thing for the environment?

Weatherhead says that what will happen in the future isn't clear, but if the climate trends continue, there are likely to be further changes in population size.

In 2005, Weatherhead returned to the marshy region of Canada where the other decades of data had been collected. The North Atlantic Oscillation had returned to neutral values. "We found that the harem size [the number of female birds per male] had rebounded to 2.06 which is less than expected, but it did go up. We are currently measuring the length of the breeding season to see if that has changed, affecting the sex ratio as well."
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Source:University of Illinois at Urbana-Champaign


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