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Biological Control of Eutrophication in Lakes

机译：湖泊富营养化的生物防治

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Eutrophication of lakes, expressed as excess growth of planktonic algae, is caused by excessive inputs of phosphorus and can be mitigated by many mechanisms, including grazing. However, it has been hypothesized that grazing becomes ineffective with even modest increases in P input. We tested this contention directly by fertilizing lakes that had contrasting food webs. A lake with zooplanktivorous fishes and small grazers accumulated algal biomass as predicted by Vollenweider's model of eutrophication. A lake with piscivorous fishes and large grazers accumulated about half the algal biomass predicted bythe model. However, blue-green algae bloomed in both lakes. Grazing may effectively control total algal biomass over a relatively wide range of P input rates, but may not suppress irruptions of nuisance algae.
机译：湖泊富营养化表现为浮游藻类的过度生长，是由于磷的过量输入引起的，并且可以通过许多机制（包括放牧）来缓解。但是，据推测，即使P输入适度增加，放牧也变得无效。我们通过施肥具有相反食物网的湖泊直接测试了这种竞争。根据沃伦韦德（Vollenweider）的富营养化模型的预测，一个有浮游鱼类和小型放牧者的湖泊会积聚藻类生物量。该模型预测，一个有食鱼和大型放牧者的湖泊积聚了大约一半的藻类生物量。但是，两个湖中都盛开了蓝绿色的藻类。放牧可以在相对较宽的磷输入速率范围内有效控制总藻类生物量，但不能抑制有害藻类的入侵。

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