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首页> 外文期刊>Marine ecology progress series >Phases of microalgal succession in sea ice and the water column in the Baltic Sea from autumn to spring
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Phases of microalgal succession in sea ice and the water column in the Baltic Sea from autumn to spring

机译：从秋季到春季，波罗的海海冰和水柱中微藻演替的阶段

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The phytoplankton biomass in the Baltic Sea is low during the cold-water season (October to May) compared to the warm-water season(June to September). However, the sea ice is a habitat for diverse assemblages in polar and subpolar areas. These areas, including the Baltic Sea, are subject to changing environmental conditions due to global warming, and temporal and spatial studies are required to understand changes in the processes the organisms are involved in. We delineated microalgal succession in the northern Baltic Sea during the cold-water season using a weekly collected data set. Microscopy results together with molecular methods showed that 5 microbial groups could be distinguished: the sea-ice microalgal assemblage and 4 phytoplankton assemblages(fall, winter, under-ice water and spring). Based on cell enumeration, the microalgal biomass in the water column remained low until the end of the ice-covered season and was dominated by small flagellates and dinoflagellates. The young-ice assemblage in January resembled the water-column assemblage, but indicated a partly selective species-concentrating mechanism during ice formation due to lower species richness in ice than in the water column. Biomass of microalgae increased in the ice and water column during the March to May period, and the assemblage changed from flagellate-dominated to diatom-and dinoflagellate-dominated. The result that the spring phytoplankton, based on species and biomass, formed a separate as semblage indicates that sea-ice algae did not contribute to the spring bloom phytoplankton assemblage.
机译：与冷水季节（6月至9月）相比，在冷水季节（10月至5月）波罗的海的浮游植物生物量较低。但是，海冰在极地和亚极地区是多种生物的栖息地。由于全球变暖，这些地区（包括波罗的海）的环境条件不断变化，需要进行时空研究以了解生物体参与过程的变化。我们描述了寒冷期间波罗的海北部微藻的演替使用每周收集的数据集的淡水季节。显微镜检查结果和分子方法结果表明，可以区分5个微生物组：海冰微藻组合和4种浮游植物组合（秋季，冬季，冰下水和春季）。基于细胞计数，水柱中的微藻生物量一直保持较低水平，直到冰覆盖季节结束，并以小鞭毛和鞭毛藻为主。一月份的幼冰组合类似于水柱组合，但由于在冰中的物种丰富度低于水柱中的物种丰富度，因此在冰形成过程中表明了部分选择性的物种聚集机制。在三月至五月期间，冰和水柱中的微藻生物量增加，其组成从鞭毛为主，变为硅藻和双鞭毛为主。春季浮游植物基于物种和生物量形成单独的集合的结果表明，海冰藻类对春季开花浮游植物的组装没有贡献。

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