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首页> 外文期刊>Journal of Biogeography >Mammalian responses to Middle Holocene climatic change in the Great Basinof the western United States
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Mammalian responses to Middle Holocene climatic change in the Great Basinof the western United States

机译：哺乳动物对美国西部大盆地中全新世气候变化的反应

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摘要

In spite of decades of intense research directed toward understanding the climates and ecology of the Great Basin (western United States) during the past 10,000 years, the responses of mammals to the extreme aridity of the Middle Holocene (c. 8000-5000 years ago) in this region have been poorly understood. Using a well-dated small mammal sequence from Homestead Cave, north-central Utah, I show that the Middle Holocene small mammal faunas of this area underwent a decrease in species richness and evenness, driven largely by a series of local extinctions and near-extinctions coupled with a dramatic increase in the abundance of taxa well-adapted to xeric conditions. At the end of this period, some taxa that require relatively mesic habitats began to increase in abundance immediately, others did not rebound in abundance until several thousand years later, while still others have not returned at all. This suite of responses has been difficult to detect because climatic change at the beginning of the Middle Holocene was so much more substantial than that which occurred toward its end.
机译：尽管在过去的10,000年中进行了数十年的深入研究，以了解大盆地（美国西部）的气候和生态，但哺乳动物对中全新世（约8000-5000年前）的极端干旱的反应在这个地区人们了解得很少。我使用犹他州中北部霍姆斯特德洞穴的一个良好的小型哺乳动物序列，表明该地区的中全新世小型哺乳动物动物的物种丰富度和均匀度下降，主要是由于一系列局部灭绝和近乎灭绝充分适应干旱条件的分类单元数量急剧增加。在此阶段结束时，一些需要相对较陡的生境的分类单元立即开始大量增加，另一些直到几千年后才恢复丰满，而另一些则完全没有恢复。这套反应很难被发现，因为中全新世初期的气候变化比其末期的气候变化要重要得多。

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