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首页> 外文期刊>Estuarine Coastal and Shelf Science >Response of bacterial community structure and function to experimental rainwater additions in a coastal eutrophic embayment
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Response of bacterial community structure and function to experimental rainwater additions in a coastal eutrophic embayment

机译：细菌在沿海富营养化隔离带的群落结构和功能对试验性雨水添加的响应

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Although recognized as a potentially important source of both inorganic and organic nutrients, the impact of rainwater on microbial populations from marine planktonic systems has been poorly assessed. The effect of rainwater additions on bacterioplankton metabolism and, community composition was evaluated in microcosm experiments enclosing natural marine plankton populations from the Ria de Vigo (NW Spain). The experiments were conducted during three different seasons (spring, autumn and winter) using rainwater collected at three different locations: marine, urban and rural sites. Bacterial abundance and production significantly increased up to 1.3 and 1.8-fold, respectively, after urban rainwater additions in spring, when ambient nutrient concentration was very low. Overall, the increments in bacterial production were higher than those in bacterial respiration, which implies that a higher proportion of carbon consumed by bacteria would be available to higher trophic levels. The response of the different bacterial groups to distinct rainwater types differed between seasons. The most responsive bacterial groups were Betaproteobacteria which significantly increased their abundance after urban (in spring and winter) and marine (in spring) rainwater additions, and Bacteroidetes which positively responded to all rainwater treatments in spring and to urban rainwater in autumn. Gammaproteobac-teria and Roseobacter responded only to urban (in spring) and marine (in winter) rainwater treatment, respectively. The responses to rainwater additions were moderate and transient, and the resulting bacterial community structure was not importantly altered.
机译：尽管雨水被认为是无机和有机养分的潜在重要来源，但是对雨水对海洋浮游系统中微生物种群的影响的评估却很少。雨水添加对细菌浮游生物代谢和群落组成的影响，是在微观实验中评估的，该实验包含了来自Ria de Vigo（西班牙西北部）的天然海洋浮游生物种群。实验在三个不同的季节（春季，秋季和冬季）进行，使用在三个不同地点（海洋，城市和农村地区）收集的雨水。在春季添加城市雨水后，当环境养分浓度非常低时，细菌的丰度和产量分别显着增加至1.3倍和1.8倍。总体而言，细菌产量的增加高于细菌呼吸的增加，这意味着更高营养水平的细菌消耗的碳比例更高。不同季节，不同细菌对不同雨水类型的反应也不同。响应最快的细菌群是β变形杆菌，在城市（春季和冬季）和海洋（春季）添加雨水后，其丰度显着增加，而拟杆菌属则对春季的所有雨水处理和秋季的城市雨水产生积极的响应。丙酸杆菌和玫瑰杆菌分别仅对城市（春季）和海洋（冬季）雨水处理有反应。对雨水添加的反应是中等和短暂的，并且所产生的细菌群落结构没有重要改变。

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