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首页> 外文期刊>Journal of limnology >Effects of silver carp (Hypophthalmichthys molitrix) on spring phytoplankton community structure of Three-Gorges Reservoir (China): Results from an enclosure experiment
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Effects of silver carp (Hypophthalmichthys molitrix) on spring phytoplankton community structure of Three-Gorges Reservoir (China): Results from an enclosure experiment

机译：of鱼对三峡水库春季浮游植物群落结构的影响（封闭试验）

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摘要

Serious phytoplankton blooms occurred repeatedly every spring in many bays of the Three-Gorges Reservoir. However, little was known about the impact of phytoplanktivorous fish on spring phytoplankton community structure in the Three-Gorges Reservoir. In this study, an enclosure experiment was conducted to assess the impact of silver carp (Hypophthalmichthys molitrix) on the plankton community structure and water quality of the Three-Gorges Reservoir during 2 April to 2 May 2008. The field experiment was performed in six enclosures. Stocking silver carp into enclosures caused a dramatic change in the aquatic ecosystem. For example, pH, transparency, DO and phosphate were reduced, while chlorophyll-a concentration and turbidity increased dramatically. Furthermore, during the enclosure experiment, some zooplankton such as rotifer and copepoda were significantly reduced, and some phytoplankton and protozoa were significantly increased by silver carp. The predation by silver carp might have increased phytoplankton biomass through reducing the densities of some zooplankton which directly fed on phytoplankton. It was concluded that silver carp was not suitable for clearing spring phytoplankton (<20 μm) blooms in the Three-Gorges Reservoir at the present time.
机译：每年春季，三峡水库的许多海湾中都反复发生严重的浮游植物开花。然而，关于三峡水库中浮游植物鱼类对春季浮游植物群落结构的影响知之甚少。在这项研究中，进行了围栏实验，以评估of鱼对2008年3月2日至5月2日三峡水库浮游生物群落结构和水质的影响。在六个围栏中进行了田间试验。将silver鱼放养到圈舍中会导致水生生态系统发生巨大变化。例如，pH，透明度，DO和磷酸盐降低，而叶绿素a浓度和浊度显着增加。此外，在围捕试验中，silver鱼使浮游动物如轮虫和角足纲动物明显减少，而某些浮游植物和原生动物明显增加。 reducing鱼的捕食可能会通过减少某些直接以浮游植物为食的浮游动物的密度来增加浮游植物的生物量。结论是silver鱼目前不适合清除三峡水库的春季浮游植物（<20μm）水华。

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