Responses to experimental fish manipulations in a shallow, hypereutrophic lake: the relative importance of benthic nutrient recycling and trophic cascade
Responses to experimental fish manipulations in a shallow, hypereutrophic lake: the relative importance of benthic nutrient recycling and trophic cascade
复制标题
对浅层超富营养化湖泊中鱼类实验操作的反应：底栖养分循环和营养级联的相对重要性
DOI：
10.1007/bf00014310
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发表时间：
1993
期刊：
影响因子：
2.6
通讯作者：
K. Havens
中科院分区：
文献类型：
--
作者：
K. Havens
在一个浅层富营养化湖泊中使用了中生态系统，并重复建立了三种处理方法：（a）鱼 - 以自然相对密度放养本地鱼类，（b）鱼/网 - 放养鱼，但用网阻挡进入沉积物，以及（c）无鱼。鱼处理中总磷和叶绿素浓度分别达到 140 和 170 µg l−1。在鱼/网和无鱼处理中，总 P 均低于 40 µg l−1。然而，尽管总磷浓度几乎相同，但在“无鱼”处理中，叶绿素平均为 40 µg l−1，其中浮游动物生物量较高，大型枝角动物 Moina 丰富；而在“鱼/网”处理中，叶绿素平均为 50 µg l−1，其中浮游动物生物量较低，大型食草动物很少。结果表明，底栖养分循环和级联营养相互作用都是藻类生物量的调节因素，但前者的影响迄今为止更为重要，约占与鱼类存在相关的叶绿素增加的 60%。
Mesocosms were used in a shallow hypereutrophic lake, and three treatments were established in duplicate: (a) Fish — stocked with native fish at their natural relative densities, (b) Fish/Net — stocked with fish, but with a net blocking access to the sediments, and (c) No Fish. Total P and chlorophyll concentrations reached 140 and 170 µg l−1 in the Fish treatment. Total P was below 40 µg l−1 in both the Fish/Net and No Fish treatments. However, despite the nearly identical total P concentrations, chlorophyll averaged 40 µg l−1 in the No Fish treatment, where zooplankton biomass was high and the large cladoceran Moina was abundant, and 50 µg l−1 in the Fish/Net treatment, where zooplankton biomass was low and large herbivores were rare. The results showed that both benthic nutrient recycling and cascading trophic interactions were regulators of algal biomass, but that the former effect was by far the more important, accounting for roughly 60% of the chlorophyll increase associated with the presence of fish.