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首页> 外文期刊>Environmental Pollution >Phytoplankton responses to biomanipulated grazing pressure and nutrient additions -- enclosure studies in unlimed and limed Lake Njupfatet, central Sweden
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Phytoplankton responses to biomanipulated grazing pressure and nutrient additions -- enclosure studies in unlimed and limed Lake Njupfatet, central Sweden

机译：浮游植物对生物控制的放牧压力和养分添加的反应-在瑞典中部的Njupfatet湖中进行了无石灰和石灰化的围捕研究

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摘要

Enclosure experiments aimed to assess the role of Chaoborus larvae in regulating lower trophic levels under natural and nutrient- enriched conditions were performed in situ in the dimictic, oligotrophic clearwater Lake Njupfatet, central Sweden. One experiment was performed before, and one after, whole-lake calcite treatment. In the acidic system, total planktonic biomass (TPB; the sum of phyto-, bacterio-, protozoo-, and metazooplankton), dominated by the cyanobacterium Merismopedia, was only weakly stimulated by the nutrients while the predator had no effect. In the limed environment, TPB increased strongly in response to the nutrients in combination with a negative response to the predator. Principally phytoplankton, but also bacterioplankton and protozooplankton (ciliates) were stimulated by the nutrients. It is argued that Merismopedia acted as a dead-end in the energy flow in the acidic system. Liming resulted in the disappearance of Merismopedia and this opened the flow of material to higher trophic levels. Since liming also led to a significant reduction in the concentrations of phosphorus in the lake water, it is proposed that a combination of liming and gentle fertilization might be used to restore the productivity of acidified lakes.
机译：在瑞典中部的人造的，贫营养的清水湖Njupfatet原位进行了封闭试验，目的是评估潮虫幼虫在调节自然营养和富营养条件下降低营养水平方面的作用。在全湖方解石处理之前和之后进行了一项实验。在酸性系统中，总浮游生物量（TPB；浮游植物，细菌，原生动物和后生浮游动物的总和）主要由蓝藻细菌拟青霉所主导，但其养分对它们的刺激很小，而捕食者则没有作用。在石灰环境中，TPB对营养物质的反应强烈，同时对捕食者的反应也较弱。营养物质主要刺激浮游植物，但也刺激浮游细菌和原藻浮游动物（纤毛虫）。有人认为，Merismopedia在酸性系统的能量流中起到了死胡同的作用。黎明导致Merismopedia的消失，这将物质的流动推向了更高的营养水平。由于撒石灰还导致湖水中磷的浓度显着降低，因此建议将撒石灰和温和施肥相结合以恢复酸化湖泊的生产力。

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