An introduced invertebrate predator (Bythotrephes) reduces zooplankton species richness
An introduced invertebrate predator (Bythotrephes) reduces zooplankton species richness
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引入的无脊椎动物捕食者（Bythotrephes）降低了浮游动物物种的丰富度
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Boudreau
中科院分区：
文献类型：
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作者：
N. Yan;R. Girard;S. Boudreau
生态学家很少有评估入侵物种对生物多样性影响所需的数据，即入侵前和入侵后的普查资料，包括入侵地点和控制地点的资料。使用21年的时间序列，我们表明，竖琴湖，安大略，加拿大，由欧亚刺水蚤，Bythotrephes longimanus，食虫动物，入侵伴随着快速和持久的减少，甲壳类浮游动物的平均物种丰富度，特别是枝角藻类群。在同样的20年里，在附近7个未被入侵的湖泊中没有观察到这种减少。如果竖琴湖的结果是典型的，我们预测在加拿大地盾的甲壳类浮游动物丰富度的广泛减少有三个原因。盾湖为入侵者提供了良好的栖息地。其扩散率和定殖成功率都很高。竖琴湖的浮游动物丰富度对于一个规模和酸度都很大的盾湖来说是非常低的。
Rarely do ecologists have the data needed to assess the impacts of invading species on biodiversity, i.e. pre- and post-invasion census information from both invaded and control sites. Using a 21-year time series, we demonstrate that the invasion of Harp Lake, Ontario, Canada, by the Eurasian spiny water flea, Bythotrephes longimanus, a zooplanktivore, was accompanied by a rapid and long-lasting reduction in the average species richness of crustacean zooplankton, particularly of cladoceran taxa. No such reduction was observed in seven nearby un-invaded lakes over the same two decades. If the Harp Lake results are typical, we predict a widespread reduction in crustacean zooplankton richness on the Canadian Shield for three reasons. Shield lakes provide the invader with good habitat. Its dispersal rates and colonization success are high. Zooplankton richness in Harp Lake is now unusually low for a Shield Lake of its size and acidity.