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Interrelationships between phosphorus loading and common carp in the regulation of phytoplankton biomass

机译：磷含量与鲤鱼在浮游植物生物量调控中的相互关系

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The interrelationship between phosphorus loading and common carp in the regulation of phytoplankton biomass was examined in a four-week summer mesocosm experiment. The factorial design consisted of two levels of phosphorus loading (with/ without) cross-classified with two levels of common carp (with/without). At the conclusion of the mesocosm experiment, common carp were removed from mesocosms and a nutrient excretion and defecation trial was performed. A significant interaction effect was detected between phosphorus loading and common carp for chlorophyll-a (a proxy for phytoplankton biomass), total nitrogen, and nitrogen: phosphorus. Common carp had modest effects on chlorophyll-a in mesocosms without phosphorus loading but relatively large enhancement effects on chlorophyll-a in mesocosms with phosphorus loading. Common carp increased total nitrogen in mesocosms with, phosphorus loading but had no effect on total nitrogen in mesocosms without phosphorus loading. The synergistic effect of phosphorus loading and common carp on chlorophyll-a was due to nitrogen excretion and defecation by common carp and the subsequent enhancement of nitrogen in mesocosms with phosphorus loading.
机译：在为期四周的夏季中观宇宙实验中，研究了磷负荷与鲤鱼之间在浮游植物生物量调节中的相互关系。析因设计包括两个级别的磷负载量（有/没有）和两个级别的鲤鱼（有/没有）交叉分类。在中观实验结束时，将鲤鱼从中观实验中移出，进行营养排泄和排便试验。在磷的负载量与鲤鱼的叶绿素-a（浮游植物生物量的替代物），总氮和氮：磷之间发现了显着的交互作用。鲤鱼对不带磷的包膜对叶绿素a的影响中等，而对不带磷的包膜对叶绿素a的增强作用较大。鲤鱼在磷负荷下增加了介观膜中的总氮，但对无磷负荷的介观膜中的总氮没有影响。磷负载和鲤鱼对叶绿素-a的协同作用是由于鲤鱼排泄氮和排便，以及随后随着磷负载而使介体中的氮增加。

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