Internal and external influences on near-surface microbial community structure in the vicinity of the Cape Verde Islands.
Internal and external influences on near-surface microbial community structure in the vicinity of the Cape Verde Islands.
复制标题
对佛得角群岛附近近地表微生物群落结构的内部和外部影响。
DOI：
10.1007/s00248-011-9952-2
复制
发表时间：
2012
影响因子：
3.6
通讯作者：
Hill PG
中科院分区：
文献类型：
--
作者：
Hill PG
在亚热带东北大西洋的微生物群落结构进行了比较2年之间的变化归因于环境变量。采用流式细胞仪和荧光原位杂交技术对表层海水群落进行了分析。对α-变形菌、蓝细菌、γ-变形菌和拟杆菌特异的探针鉴定了67-100%的细胞。由于主要洋流和岛屿的出现，研究区域的自然变化，数据无法汇总，而是分为不同的水团。社区结构没有很大的不同，在佛得角群岛之间的采样期间，但在公海变化很大，这表明不同的环境扰动有利于特定的细菌群。2008年冬季的风速为中到强风，而2006年冬季则有大风（分别为8.9 ± 0.2 ms− 1和16.0 ± 0.4 ms−1）。增强的风力驱动的湍流与α变形菌的SAR 11分支的优势有关，其在原绿球藻丰度中的存在量为2.4倍（41.8 ± 1.6%细胞，相比之下为17.7 ± 7.1%）。相反，2008年的平静条件似乎有利于原绿球藻（40.0 ± 1.2%）。原绿球藻适应强光的分支HLI只在风力驱动的湍流中大量存在，而适应寡养的分支HLII在平静条件下占主导地位。拟杆菌在湍流条件下最突出（9.5 ± 1.3%，而4.7 ± 0.3%），聚球藻也是如此。2008年，该地区发生了相当大的粉尘沉降事件，这可能导致了大量的γ-变形菌群（22.5 ± 4.0%的细胞，而2006年为4.6 ± 0.6%）。风驱动的湍流可能会对海洋表层微生物群落结构产生重大影响。因此，沙尘暴事件后的群落变化可能与相关的风，除了灰尘衍生的营养物质。
Microbial community structure in the subtropical north-east Atlantic Ocean was compared between 2 years and variation attributed to environmental variables. Surface seawater communities were analysed by flow cytometry and fluorescence in situ hybridisation. Probes specific toAlphaproteobacteria,Cyanobacteria,GammaproteobacteriaandBacteroidetesidentified 67–100% of cells. Due to natural variation in the study region due to the occurrence of major currents and islands, data could not be pooled but were instead divided between distinct water masses. Community structure did not differ greatly around the Cape Verde Islands between sampling periods but varied substantially in the open ocean, suggesting different environmental perturbations favour specific bacterial groups. Wind speed varied significantly between years, with moderate to strong breeze in winter 2008 and gales in winter 2006 (8.9 ± 0.2 ms−1and 16.0 ± 0.4 ms−1, respectively). Enhanced wind-driven turbulence was associated with domination by the SAR11 clade ofAlphaproteobacteria, which were present at 2.4-fold in the abundance ofProchlorococcus(41.8 ± 1.6% cells, compared to 17.7 ± 7.1%). Conversely, the calmer conditions of 2008 seemed to favourProchlorococcus(40.0 ± 1.2% cells).Prochlorococcushigh-light adapted clade HLI were only numerous during wind-driven turbulence, whereas oligotrophic-adapted clade HLII dominated under calm conditions.Bacteroideteswere most prominent in turbulent conditions (9.5 ± 1.3% cells as opposed to 4.7 ± 0.3%), as wereSynechococcus. In 2008, a considerable dust deposition event occurred in the region, which may have led to the substantialGammaproteobacteriapopulation (22.5 ± 4.0% cells compared to 4.6 ± 0.6% in 2006). Wind-driven turbulence may have a significant impact on microbial community structure in the surface ocean. Therefore, community change following dust storm events may be linked to associated wind in addition to dust-derived nutrients.