Mieczan Tomasz, Grześkiewicz Michał
Department of Hydrobiology and Protection of Ecosystems, University of Life Sciences, Dobrzańskiego 37, 20-262 Lublin, Poland.
Saudi J Biol Sci. 2021 Sep;28(9):5175-5186. doi: 10.1016/j.sjbs.2021.05.047. Epub 2021 May 26.
One of the effects of warming is earlier retreat of the ice cover or a complete lack of ice cover on water bodies in the winter. However, there is still no information on how climate warming affects the 24-hour dynamics of the planktonic microbial loop in winter. The aim of this investigation was to assess the diurnal dynamics of the taxonomic composition and abundance of microbial communities in experimentally reproduced conditions (samples from under the ice, +2, +4 and +8 °C) and to analyse the relationships between components of the microbial loop in relation to physical and chemical parameters. Samples were taken in winter from three dystrophic reservoir. The biological and physicochemical parameters in the water were analysed at the start (day 0), 15 and end of the experiment (day 30) over a 24-hour cycle. The increase in temperature caused an increase in the numbers of predators (particularly testate amoebae and ciliates) and a reduction in the body size of individual populations. During the period with ice cover, marked dominance of mixotrophic testate amoeba and ciliates () was observed, while the increase in temperature caused an increase in the proportion of bacterivorous ciliates (.
气候变暖的影响之一是冰盖提前消退，或者冬季水体完全无冰覆盖。然而，关于气候变暖如何影响冬季浮游微生物环的24小时动态，目前仍无相关信息。本研究的目的是评估在实验再现条件下（来自冰下、+2、+4和+8°C的样本）微生物群落的分类组成和丰度的昼夜动态，并分析微生物环各组成部分与物理和化学参数之间的关系。冬季从三个贫营养水库采集样本。在实验开始（第0天）、第15天和结束（第30天）时，在24小时周期内分析水中的生物和理化参数。温度升高导致捕食者数量增加（特别是有壳变形虫和纤毛虫），单个种群的体型减小。在有冰覆盖期间，观察到混合营养型有壳变形虫和纤毛虫（ ）占明显优势，而温度升高导致食细菌纤毛虫（ ）的比例增加。
