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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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By about 10,000 years ago, nearly 100 species of large animals had been recently driven to extinction around the globe.
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This march of megafauna mortality coincides suspiciously with the arrival of another large animal in their vicinity: humans.
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The die off in South America included giant ground sloths and armadillo-like animals the size of cars known as glyptodonts.
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And the deaths seem responsible for the dearth of nutrients in Amazon rainforest soils today.
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So says a study in the journal Nature Geoscience.
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Plainly put, these big animals disperse a lot of phosphorous in their feces.
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Once the big animals are gone, there's no way for the phosphorous to get from one part of the rainforest to another.
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As a result, the Amazon rainforest even today is struggling to recover from that loss of fertility.
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Other parts of the world face the same poop paucity predicament, according to the researchers' model.
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But the impact outside the Amazon was less severe, for reasons still unknown.
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What is clear is that the impact of extinction reverberates down through the millennia,
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a clear signal that we've been living in the Anthropocene for a while.
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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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显示原文 =This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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显示原文 =By about 10,000 years ago, nearly 100 species of large animals had been recently driven to extinction around the globe.
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显示原文 =This march of megafauna mortality coincides suspiciously with the arrival of another large animal in their vicinity: humans.
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显示原文 =The die off in South America included giant ground sloths and armadillo-like animals the size of cars known as glyptodonts.
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显示原文 =And the deaths seem responsible for the dearth of nutrients in Amazon rainforest soils today.
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6 / 14
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显示原文 =So says a study in the journal Nature Geoscience.
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显示原文 =Plainly put, these big animals disperse a lot of phosphorous in their feces.
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8 / 14
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显示原文 =Once the big animals are gone, there's no way for the phosphorous to get from one part of the rainforest to another.
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9 / 14
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显示原文 =As a result, the Amazon rainforest even today is struggling to recover from that loss of fertility.
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显示原文 =Other parts of the world face the same poop paucity predicament, according to the researchers' model.
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11 / 14
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显示原文 =But the impact outside the Amazon was less severe, for reasons still unknown.
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12 / 14
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显示原文 =What is clear is that the impact of extinction reverberates down through the millennia,
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13 / 14
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显示原文 =a clear signal that we've been living in the Anthropocene for a while.
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14 / 14
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显示原文 =Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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- 单句循环：关
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