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首页> 外文期刊>Journal of Paleolimnology >Effects of fish introduction and eutrophication on the cladoceran community in Lake Fuxian, a deep oligotrophic lake in southwest China
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Effects of fish introduction and eutrophication on the cladoceran community in Lake Fuxian, a deep oligotrophic lake in southwest China

机译：鱼类引入和富营养化对中国西南深部富营养化湖泊富县湖枝cl群落的影响

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Fish introduction and eutrophication are important disturbances to aquatic ecosystems, especially to oligotrophic plateau lakes that are generally considered to be very vulnerable ecosystems. Planktivorous fish Neosalanx taihuensis were introduced to Lake Fuxian, an oligotrophic (TP 17 μg/l) deep (average depth 89.7 m) plateau lake in southwest China, in the middle of the 1980s. After the introduction, N. taihuensis became the dominant fish species, and the total fish yield increased about threefold. Although the lake is still oligotrophic, the trophic state of Lake Fuxian has started to shift with increasing nutrient supply (eutrophication) due to an increase in human activities in the drainage basin. This study investigated the effects of N. taihuensis introduction and eutrophication on the cladoceran community of Lake Fuxian by examining changes in cladoceran assemblages and abundance, as well as the morphological features of Bosmina microfossils in the lake sediment. Absolute abundance of total Bosmina increased substantially after the middle of the 1980s. In addition, dominance of Bosmina with straight antennules was replaced by Bosmina with hooked antennules. The morphological variables (length of carapace, antennule and mucro) of Bosmina all decreased when planktivorous fish N. taihuensis achieved relatively large numbers. Eutrophication was the most important process determining cladoceran abundance, while fish introduction played an important role in structuring the cladoceran community in this oligotrophic, deep plateau lake.
机译：鱼类的引入和富营养化是对水生生态系统的重要干扰，特别是对通常被认为是非常脆弱的生态系统的贫营养高原湖泊。在1980年代中期，浮游鱼类太湖新s鱼被引入中国西南部一个贫营养（TP 17μg/ l）深（平均深度89.7 m）的高原湖泊。引进后，太湖猪笼草成为优势鱼类，总鱼产量增加了三倍。尽管该湖仍是贫营养的，但由于流域内人类活动的增加，抚仙湖的营养状态已开始随着养分供应（富营养化）的增加而发生变化。本研究通过研究湖盆沉积物的枝叶藻类组合和丰度变化以及微细化石的形态学特征，研究了太湖猪笼草的引入和富营养化对抚仙湖枝叶藻类群落的影响。 1980年代中期以后，总波斯尼亚的绝对丰度大大增加。此外，具有直角的前额的波斯尼亚被具有钩状的前额的波斯尼亚所取代。当浮游鱼类太湖猪笼草的数量增多时，波斯尼亚的形态变量（甲壳，触角和粘膜的长度）都减小了。富营养化是确定枝角类鱼类丰度的最重要过程，而鱼类的引入在这个贫营养的深高原湖泊中，在构造枝角类鱼类群落中起着重要作用。

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