Effect of phytoplankton bloom deposition on benthic bacterial communities in two contrasting sediments in the southern North Sea
Effect of phytoplankton bloom deposition on benthic bacterial communities in two contrasting sediments in the southern North Sea
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DOI：
10.3354/ame048241
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发表时间：
2007-08-09
影响因子：
1.4
通讯作者：
Vanaverbeke, J.
中科院分区：
文献类型：
--
作者：
Franco, M. A.;De Mesel, I.;Vanaverbeke, J.
在北海南部 2 个对比地点的 2 个不同沉积层中研究了底栖细菌群落组成、多样性和生物量对浮游植物沉积的响应。观察站之间细菌群落组成的差异。细菌群落组成的季节性差异显着，并且在细沉积物中更强，可能与食物供应的更强波动有关。两个站的垂直沉积剖面上的群落组成变化不同。在较粗的沉积物中，差异主要是由于表面缺乏某些操作分类单位（OTU），而在细沉积物中，存在 2 个不同的群落。相关测试表明，细菌群落组成受到不稳定有机物含量的影响（通过沉积物中的叶绿素浓度估算）。细粒沉积物中 OTU 丰富度和 Shannon-Weaver 多样性指数的多样性较高。在较粗的沉积物中，表层的多样性较低，这可能与该站较强的动水压力有关。其他站没有观察到这些差异。两个站点均未检测到多样性的季节性变化。较细沉积物中的细菌生物量稍高，并且与叶绿素 a 或温度均不相关。细菌生物量的季节性差异遵循群落组成的观察结果，但没有检测到垂直差异。
The response of benthic bacterial community composition, diversity, and biomass to phytoplankton deposition was investigated in 2 different sediment horizons at 2 contrasting sites in the southern North Sea. Differences in bacterial community composition between stations were observed. Seasonal differences in bacterial community composition were significant and were stronger in fine sediments, probably related to stronger fluctuations in food availability. Variation in community composition over the vertical sediment profile was different for both stations. In coarser sediment, the difference was mostly due to the absence of certain operational taxonomic units (OTUs) at the surface, while in fine sediment, 2 distinct communities were present. A RELATE test revealed that bacterial community composition was influenced by the amount of labile organic matter (estimated through chl a concentration in the sediment). Diversity in terms of OTU richness and Shannon-Weaver diversity index was higher in finer grained sediments. In coarser sediments, diversity at the surface layer was lower, which might be related to stronger hydrodynamic pressure at this station. These differences were not observed at the other station. Seasonal changes in diversity were not detected at either station. Bacterial biomass was slightly higher in finer sediments and was not correlated with either chl a or temperature. Seasonal differences in bacterial biomass followed those observed for community composition, while no vertical differences were detected.