Abstract

The phytoplankton activity was analyzed in June 2015 in Onega Bay of the White Sea. The chlorophyll a concentration, as well as cell abundance and cell biomass, were assessed in natural phytoplankton samples and individually for the picoplankton fraction. These data were compared with the results of additional optical measurements for the same water samples. A strong correlation (R² = 0.82) was found between chlorophyll absorbance (~680 nm, absorbance spectra) and in vivo chlorophyll fluorescence intensity. Мicroalgae had a high level of photosynthetic efficiency (Fv/Fm > 0.4). The picoplankton fraction was characterized by less efficient photosynthesis, probably due to the presence of cyanobacteria. The picoplankton fraction contributed a few percent to the total biomass, whereas its contribution to the total chlorophyll fluorescence intensity reached up to 40%.

中文翻译：

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白海奥涅加湾浮游植物的功能活性和悬浮颗粒物的光学性质

摘要

2015年6月在白海的Onega湾对浮游植物的活动进行了分析。对天然浮游植物样品中的叶绿素a浓度以及细胞丰度和细胞生物量进行了评估，并分别评估了微微浮游植物的比例。将这些数据与相同水样品的其他光学测量结果进行比较。发现叶绿素吸收度（〜680 nm，吸收光谱）与体内叶绿素荧光强度之间具有很强的相关性（R ² = 0.82）。海藻的光合作用效率高（Fv / Fm> 0.4）。浮游生物级分的特征是光合作用效率较低，这可能是由于蓝细菌的存在所致。微型浮游生物部分占总生物量的百分之几，而其对总叶绿素荧光强度的贡献则高达40％。