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首页> 外文期刊>Estuarine Coastal and Shelf Science >Macroalgal blooms favor heterotrophic diazotrophic bacteria in nitrogen-rich and phosphorus-limited coastal surface waters in the Yellow Sea
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Macroalgal blooms favor heterotrophic diazotrophic bacteria in nitrogen-rich and phosphorus-limited coastal surface waters in the Yellow Sea

机译：大型藻类的繁殖有利于黄海中富氮和磷受限的沿海地表水中的异养重氮细菌

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Macroalgal blooms may lead to dramatic changes in physicochemical variables and biogeochemical cycling in affected waters. However, little is known about the effects of macroalgal blooms on marine bacteria, especially those functioning in nutrient cycles. We measured environmental factors and investigated bacterial diazotrophs in two niches, surface waters that were covered (CC) and non-covered (CF) with massive macroalgal canopies of Ulva prolifera, in the Yellow Sea in the summer of 2011 using real-time PCR and clone library analysis of nifH genes. We found that heterotrophic diazotrophs (Gammaproteobacteria) dominated the communities and were mostly represented by Vibrio-related phylotypes in both CC and CF. Desulfovibrio-related phylotypes were only detected in CC. There were significant differences in community composition in these two environments (p < 0.001) and a much higher abundance of nifH in CC (4.55 x 10(6) copies l(-1)) than in CF (2.49 x 10(6) copies l(-1)). The nifH copy number was inversely related to concentrations of ammonium and dissolved inorganic nitrogen and to the stoichiometric ratios of N:P and N:Si. This indicates that macroalgal blooms significantly affect diazotrophic abundance and community composition and that vibrios and Desulfovibrio-related heterotrophic diazotrophs adapt well to the (N-rich but P-limited) environment during blooming. Potential ecological and microbiological mechanisms behind this scenario are discussed. (C) 2014 Elsevier Ltd. All rights reserved.
机译：巨藻水华可能导致受影响水域的理化变量和生物地球化学循环发生剧烈变化。然而，人们对于大型藻类繁殖对海洋细菌的影响知之甚少，尤其是那些在营养循环中起作用的细菌。我们测量了环境因素，并通过实时PCR和nifH基因的克隆文库分析。我们发现异养重氮菌（γ变形杆菌）占主导地位，并主要由CC和CF中与弧菌相关的系统型代表。仅在CC中检测到与脱硫弧菌有关的系统型。在这两种环境中，社区组成存在显着差异（p <0.001），并且与CF（2.49 x 10（6）副本）相比，CC（4.55 x 10（6）副本l（-1））中的nifH丰度高得多l（-1））。 nifH拷贝数与铵和溶解的无机氮的浓度以及N：P和N：Si的化学计量比成反比。这表明大型藻类的开花显着影响重氮营养的丰度和群落组成，弧菌和与脱硫弧菌相关的异养重氮营养菌在开花过程中很好地适应（富氮但限磷的）环境。讨论了这种情况下潜在的生态和微生物机制。 （C）2014 Elsevier Ltd.保留所有权利。

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