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Bacterioplankton community variation in Bohai Bay (China) is explained by joint effects of environmental and spatial factors

机译：环渤海（中国）浮游细菌群落的变化是由环境和空间因素的共同作用来解释的

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摘要

Parsing the relative importance of environmental (recent disturbances) and spatial factors (historical processes) in determining community structure is a core issue in ecology. The Bohai Bay is a typical semi‐enclosed bay located in the north of China, surrounding by the metropolitan area with anthropogenic disturbances made it a complex marine coastal system with pollution gradients, where the distributions and determinants of bacterioplankton communities remain unclear. In this study, we collected surface water samples from 19 sites across Bohai Bay at about 100 km scale to investigate the relative roles of local environments and regional spatial factors in shaping bacterioplankton community composition (BCC). The environmental parameters in the sampling region showed gradient change according to the geographic variation. Several abundant OTUs were significantly correlated with the pollution parameters in the studied area, and 16 OTUs of them showed distinct distribution pattern in different polluted regions with obvious geographic segmentation, which indicated the effects of pollution gradient and dispersal limitation on specific taxon. The BCCs did not show obviously clustering effect between different polluted regions, which indicated the complexity for explaining the BCC variation in the studied region. The partial Mantel test revealed stronger spatial effects on beta diversity than those of local environmental factors, which indicated that dispersal limitation accounted more for the beta diversity than environmental heterogeneity. Furthermore, variation partitioning analysis (VPA) conducted by combining the environmental variables, linear trends, and principal coordinates of the variables from neighbor matrices (PCNM) showed that it was the joint effects of environmental and spatial factors contributed to the explained variation of BCC in the studied area. Considering the special human geography characteristics of Bohai Bay, the unmeasured biotic/abiotic factors, stochastic factors, and anthropogenic disturbances may be responsible for the unexplained variation of the BCC.
机译：解析环境（最近的干扰）和空间因素（历史过程）在确定社区结构方面的相对重要性是生态学的核心问题。渤海湾是典型的半封闭式海湾，位于中国北部，被大都市区人为干扰所包围，使其成为一个具有污染梯度的复杂海洋沿海系统，浮游细菌群落的分布和决定因素尚不清楚。在这项研究中，我们从大约100公里规模的渤海湾19个地点收集了地表水样本，以调查当地环境和区域空间因素在塑造浮游生物群落组成（BCC）中的相对作用。采样区域的环境参数随地理变化呈梯度变化。研究区有数个丰富的OTUs与污染参数显着相关，其中16个OTUs在不同污染区的分布格局明显，地理分割明显，说明污染梯度和扩散限制对特定分类群的影响。 BCC在不同污染区域之间没有明显的聚类作用，这说明了解释研究区域中BCC变化的复杂性。局部Mantel检验显示，对β多样性的空间影响要强于局部环境因素，这表明分散限制比环境异质性更能说明β多样性。此外，通过结合环境变量，线性趋势和相邻矩阵变量（PCNM）的主坐标进行的变异分区分析（VPA）表明，环境因素和空间因素的共同作用有助于解释BCC的变异。研究区域。考虑到渤海湾的特殊人文地理特征，无法解释的生物/非生物因素，随机因素和人为干扰可能是造成BCC无法解释的变化的原因。

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