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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >FOREST LOSSES PREDICT BIRD EXTINCTIONS IN EASTERN NORTH AMERICA
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FOREST LOSSES PREDICT BIRD EXTINCTIONS IN EASTERN NORTH AMERICA

机译：北美东部森林流失导致鸟类灭绝

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Claims that there will be a massive loss of species as tropical forests are cleared are based on the relationship between habitat area and the number of species. Few studies calibrate extinction with habitat reduction, Critics raise doubts about this calibration, noting that there has been extensive clearing of the eastern North American forest, get only 4 of its approximate to 200 bird species have gone extinct. We analyze the distribution of bird species and the timing and extent of forest loss. The forest losses were not concurrent across the region. Based on the maximum extent of forest losses, our calculations predict fewer extinctions than the number observed. At most, there are 28 species of birds restricted to the region. Only these species would be at risk even if all the forests were cleared. Far from providing comfort to those who argue that the current rapid rate of tropical deforestation might cause fewer extinctions than often claimed, our results suggest that the losses may be worse. In contrast to eastern North America, small regions of tropical forest often hold hundreds of endemic bird species. [References: 47]
机译：根据生境面积与物种数量之间的关系，声称随着热带森林的砍伐，物种将大量流失。很少有研究通过减少栖息地来校准灭绝物种，批评人士对此校准表示怀疑，指出北美东部森林已被广泛砍伐，大约200种鸟类中只有4种已经灭绝。我们分析了鸟类的分布以及森林流失的时间和程度。该地区的森林损失并非同时发生。根据最大的森林损失程度，我​​们的计算预测灭绝的数量将少于观察到的数量。最多只有28种鸟类局限于该地区。即使所有森林都被砍伐，只有这些物种才有风险。我们的结果并没有为那些认为当前热带森林砍伐速度可能导致灭绝的人数少于通常声称的数量的人提供安慰，我们的结果表明，损失可能更大。与北美东部相反，热带森林的小区域通常拥有数百种特有鸟类。 [参考：47]

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