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Role of Daphnia in the decomposition of organic matter in the surface layer of Lake Biwa

机译：水蚤在琵琶湖表层有机质分解中的作用

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摘要

To examine the role of Daphnia in the decomposition and elimination of organic carbon at the surface layer, organic matter from Lake Biwa was incubated with and without Daphnia at 20℃ in the dark for 15 days in May, July and October. In all of the experiments, total organic carbon decreased during the incubation, regardless of treatment; however, the net effect of Daphnia on this decrease differed among experiments. Daphnia stimulated the decrease in particulate organic carbon in two out of three experiments. Bacterial abundance was higher in treatments with Daphnia than in treatments without Daphnia in all experiments. Higher bacterial abundance in treatments with Daphnia could not be explained fully by zooplankton grazing effects on phagotrophic protozoans, rather Daphnia seemed to stimulate bacterial growth by supplying substrates for that growth. The results of the present study suggest that Daphnia reduces sinking flux, not only by direct grazing, but also by the channelling of particulate organic carbon into dissolved forms that are then available for bacterial growth.
机译：为了研究水蚤在表层有机碳的分解和消除中的作用，将有和没有水蚤的琵琶湖有机物分别在20℃和黑暗条件下于5月，7月和10月孵育15天。在所有实验中，无论处理如何，总的有机碳在培养过程中都会减少。然而，水蚤对这种减少的净效果在实验之间有所不同。在三个实验中有两个实验中，水蚤刺激了颗粒有机碳的减少。在所有实验中，水蚤治疗的细菌丰度均高于水蚤治疗的细菌丰度。水蚤对吞噬营养性原生动物的放牧作用不能完全解释水蚤治疗中细菌丰度的提高，而水蚤似乎通过提供生长所需的底物来刺激细菌生长。本研究的结果表明，水蚤不仅可以通过直接放牧来降低下沉通量，而且还可以通过将颗粒状有机碳转化为可用于细菌生长的溶解形式来降低下沉通量。

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