It's not just humans that still feel the effects of a trauma many years later, ecosystems do too.
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Thousands of years after human hunters wiped out big land animals like giant ground sloths, the ecosystems they lived in are still feeling the effects.
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Many ecosystems rely on big animals to supply them with nutrients, mostly from dung.
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"If you remove the big animals from an ecosystem, you pretty much stop nutrients moving,"says Chris Doughty of the University of Oxford.
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第六十二篇: 物种灭绝的影响
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