Spatially uniform but temporally variable bacterioplankton in a semi-enclosed coastal area
Spatially uniform but temporally variable bacterioplankton in a semi-enclosed coastal area
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DOI：
10.1016/j.syapm.2015.04.003
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发表时间：
2015-07-01
影响因子：
3.4
通讯作者：
Karayanni, Hera
中科院分区：
文献类型：
--
作者：
Meziti, Alexandra;Kormas, Konstantinos A.;Karayanni, Hera
关注受海岸直接影响的沿海地区浮游细菌群落时空动态的研究相当有限。此外，与公海中的群落相比，解决这些问题更加复杂。为了阐明受陆地高度影响的半封闭海湾中空间与时间变异对细菌群落的影响，使用 16S rDNA 454 焦磷酸测序在 9 个月的时间内对伊古迈尼察湾（希腊爱奥尼亚海）五个沿海地点的表面浮游细菌群落进行了分析。时间差异比空间差异更明显，夏季观察到的多样性指数较低。在冬季和早春，细菌群落以 SARI 1 代表为主，但这种模式在 5 月份发生了变化，突然被黄杆菌目、假单胞菌目和互单胞菌目成员取代。此外，相关性分析显示 SAR11 OTU 的存在与温度和阳光之间存在高度负相关，这可能直接或间接导致这些 OTU 在夏季消失。 SARI 1 在冬季的主导地位进一步支持了该分支的全球分布，不仅在公海，而且在沿海系统。这项研究表明，特定细菌在受人为影响的沿海系统中表现出独特的演替模式。主要的浮游细菌成分以常见的海洋细菌为代表，表现出季节性动态，而淡水和陆地相关的系统发育型则不存在。 (C) 2015 爱思唯尔有限公司。版权所有。
Studies focusing on the temporal and spatial dynamics of bacterioplankton communities within littoral areas undergoing direct influences from the coast are quite limited. In addition, they are more complicated to resolve compared to communities in the open ocean. In order to elucidate the effects of spatial vs. temporal variability on bacterial communities in a highly land-influenced semi-enclosed gulf, surface bacterioplankton communities from five coastal sites in Igoumenitsa Gulf (Ionian Sea, Greece) were analyzed over a nine-month period using 16S rDNA 454-pyrosequencing. Temporal differences were more pronounced than spatial ones, with lower diversity indices observed during the summer months. During winter and early spring, bacterial communities were dominated by SARI 1 representatives, while this pattern changed in May when they were abruptly replaced by members of Flavobacteriales, Pseudomonadales, and Alteromonadales. Additionally, correlation analysis showed high negative correlations between the presence of SAR11 OTUs in relation to temperature and sunlight that might have driven, directly or indirectly, the disappearance of these OTUs in the summer months. The dominance of SARI 1 during the winter months further supported the global distribution of the clade, not only in the open-sea, but also in coastal systems. This study revealed that specific bacteria exhibited distinct succession patterns in an anthropogenic-impacted coastal system. The major bacterioplankton component was represented by commonly found marine bacteria exhibiting seasonal dynamics, while freshwater and terrestrial-related phylotypes were absent. (C) 2015 Elsevier GmbH. All rights reserved.