Is Acid Rain Killing Off Wood Thrushes?

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The Cornell study adds that "even more subtle effects caused by decreased winter survival of fledglings or lower return rates of adults in acidified regions would be sufficient to generate the patterns seen in the wood thrush."

Hames emphasizes, however, that patterns are all we have thus far.

"What's crucial for us as scientists is to understand the process that leads to these patterns," he said. "Our findings regarding the wood thrush are correlational. We need more focused studies to get down to exactly what is going on."

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