Interrelationships between phosphorus loading and common carp in the regulation of phytoplankton biomass
Interrelationships between phosphorus loading and common carp in the regulation of phytoplankton biomass
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DOI：
10.1127/0003-9136/2004/0161-0147
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发表时间：
2004-10
期刊：
影响因子：
--
通讯作者：
M. Chumchal;R. Drenner
中科院分区：
文献类型：
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作者：
M. Chumchal;R. Drenner
在为期4周的夏季围隔实验中，研究了磷负荷和鲤鱼对浮游植物生物量的调节作用。析因设计包括两个水平的磷负荷（有/无）交叉分类与两个水平的普通鲤鱼（有/无）。在围隔实验的基础上，将鲤鱼从围隔中移出，进行了营养物质排泄和排便试验。一个显着的相互作用效应之间的磷负荷和普通鲤鱼的叶绿素-a（浮游植物生物量的代理），总氮，氮：磷。鲤鱼在无磷负荷的围隔中对叶绿素a的影响不大，但在有罗斯的围隔中对叶绿素a有较大的增强作用。鲤鱼对有磷负荷的围隔中的总氮有增加作用，但对无磷负荷的围隔中的总氮没有影响。磷负荷和鲤鱼对叶绿素a的协同作用是由于鲤鱼的排泄和排粪作用以及磷负荷对围隔中氮的增加。
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 con- clusion 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 phospho- rus 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 enhance- ment of nitrogen in mesocosms with phosphorus loading.