The annual cycle of phytoplankton biomass was followed in a eutrophic lake (Lake Aydat, Massif Central, France), using classic descriptors (biovolumes and chlorophyll a) as well as adenosine-5'-phosphate (ATP) levels. ATP is the metabolite indicating living biomass. ATP/Cell count and ATP/Chlorophyll a ratios were elevated due to the presence of heterotrophic organisms, such as several species of ciliates. The first ratio is greater than the second. The difference can be explained either by an underestimation of the nanoplankton fraction through the cell count method, or by a lack of sedimentation in the settling chambers used for counting cells.

译文

使用经典的描述符 (生物体积和叶绿素a) 以及腺苷-5 '-磷酸 (ATP) 水平,在富营养化的湖泊 (法国中部Massif中部的Aydat湖) 中跟踪了浮游植物生物量的年度周期。ATP是指示活生物量的代谢产物。由于异养生物 (例如几种纤毛虫) 的存在,ATP/细胞计数和ATP/叶绿素a比率升高。第一个比率大于第二个比率。这种差异可以通过细胞计数方法低估了纳米浮游生物的比例,也可以通过用于计数细胞的沉降室中缺乏沉降来解释。

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