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首页> 外文期刊>Marine ecology progress series >Changes in bacterioplankton and phytoplankton community composition in response to nutrient additions in coastal waters off the NW Iberian Peninsula
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Changes in bacterioplankton and phytoplankton community composition in response to nutrient additions in coastal waters off the NW Iberian Peninsula

机译：西北伊比利亚半岛沿海水域中营养物添加对浮游植物和浮游植物群落组成的影响

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摘要

The short-term effects of inorganic N and P (nitrate, ammonium, phosphate) and organic C and N (glucose, amino acids) inputs, added separately as well as jointly, on phytoplankton and bacterioplankton community composition were studied in 6 microcosm experiments conducted in a eutrophic coastal embayment under contrasting hydrographic conditions. The responses of the different bacterioplankton and phytoplankton groups to the distinct nutrient inputs were highly variable among experiments, which was partially related to changes in the initial environmental conditions. Gammaproteobacteria and nanoflagellates were the most responsive groups to nutrient additions. Inorganic nutrients did not promote important changes in the microbial plankton community structure but did significantly reduce diatom diversity. In contrast, organic additions promoted changes mainly in bacterioplankton groups, whilst mixed additions provoked changes in both bacterial and phytoplankton groups. While nanoflagellates increased equally in abundance after inorganic and mixed additions (2.9-fold), dinoflagellates and diatoms increased their abundances more in the mixed treatment (2.3-fold and 2.2-fold, respectively) than in the inorganic treatment. Organic and mixed additions did not provoke changes in diatom or dinoflagellate diversity. The magnitude of response of Gammaproteobacteria largely explained changes in bulk bacterial biomass and activity, whereas changes in bulk phytoplankton biomass and primary production associated to nutrient enrichment were mostly explained by the response of diatoms and large picoeukaryotes. Our results demonstrate that the type of nitrogen inputs (inorganic and/or organic) strongly affects the microbial plankton community composition and functioning in this coastal ecosystem.
机译：通过6个微观实验研究了分别添加或联合添加的无机氮和磷（硝酸盐，铵，磷酸盐）和有机碳和氮（葡萄糖，氨基酸）输入对浮游植物和浮游细菌群落组成的短期影响。在相反的水文条件下处于富营养化的沿海堤岸。在实验之间，不同的浮游细菌和浮游植物组对不同养分输入的响应变化很大，这部分与初始环境条件的变化有关。 γ-变形细菌和纳米鞭毛虫是对营养添加最敏感的人群。无机养分不会促进微生物浮游生物群落结构的重要变化，但会显着降低硅藻的多样性。相比之下，有机物的添加主要促进浮游植物组的变化，而有机物的添加则引起细菌和浮游植物组的变化。在无机和混合添加后，纳米鞭毛的丰度平均增加（2.9倍），而在混合处理中，鞭毛和硅藻的丰度比无机处理增加更多（分别为2.3倍和2.2倍）。有机和混合添加不会引起硅藻或鞭毛藻多样性的变化。 γ-变形杆菌反应的幅度在很大程度上解释了细菌总生物量和活性的变化，而浮游植物生物量的变化和与营养富集有关的初级生产主要由硅藻和大型皮核生物的响应解释。我们的结果表明，氮输入的类型（无机和/或有机）强烈影响该沿海生态系统中的微生物浮游生物群落组成和功能。

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