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Photosynthetic potential of phytoplankton in the deep water of Lake Baikal, Russia

机译：俄罗斯贝加尔湖深水区浮游植物的光合作用潜力

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摘要

We examined the photosynthetic activity of the phytoplankton community collected from the surface to a depth of 1000m in the south basin of Lake Baikal. Experiments were conducted in June (mixing period) and August (stratified period). The carbon fixation rate was measured by the use of a 13C tracer after the incubation of samples under light conditions in the upper water column. Photosynthetic fixation of 13C was detected for samples collected from a depth of 500m, indicating the viability of phytoplankton in deep water. The community composition was dominated by Bacillariophyceae in deep water. The finding of lower activity at a depth of 200m than that at a depth of 500m in August suggests that the spring diatom bloom could be a significant source of viable populations at a depth of 500m. Photosynthetic activity was not detected in samples collected at a depth of 1000m. [References: 12]
机译：我们检查了从贝加尔湖南部盆地地表到1000m深度的浮游植物群落的光合活性。在六月（混合期）和八月（分层期）进行实验。在上部水柱中在光照条件下孵育样品后，使用13C示踪剂测量碳固定率。对于从500​​m深度采集的样品，检测到13C的光合作用固定，表明深水中浮游植物的生存能力。群落组成以深水中的芽孢杆菌科为主。发现200m深度的活动性低于8月份500m深度的活动，这表明春季硅藻绽放可能是500m深度的重要种群的重要来源。在1000m深度采集的样品中未检测到光合作用活性。 [参考：12]

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