High heterogeneity of bacterioplankton community shaped by spatially structured environmental factors in West Lake, a ty
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CYANOBACTERIAL BLOOMS AND WATER ECOLOGICAL RESTORATION
High heterogeneity of bacterioplankton community shaped by spatially structured environmental factors in West Lake, a typical urban lake in eastern China Yi Du 1 & Wen Yang 1 & Xiuying Ding 2 & Jinjie Zhang 3 & Zhongming Zheng 1 & Jinyong Zhu 1,4 Received: 26 September 2019 / Accepted: 7 April 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Elucidating the bacterioplankton spatial distribution patterns and its determinants is a central topic in ecological research. However, research on the distribution patterns of bacterioplankton community composition (BCC) within a small-sized, highly dynamic freshwater lake remains unclear. In this study, we collected surface water samples from West Lake to investigate the spatiotemporal variation of BCC by 16S rRNA gene high-throughput sequencing. Clear spatial heterogeneity in BCC was identified both in summer and winter. The relatively high abundant taxa exhibited greater correlations with environmental factors and other abundant species in summer than in winter. Variation partitioning analysis was used to unravel the relative importance of environmental factors and spatial processes and further explore the underlying mechanism of BCC successions. Our results showed the predominant shared effect of environmental and spatial factors on BCC in summer (68.41%) and winter (57.37%), indicating that spatially structured environmental factors were the key determinants of structuring BCC spatial heterogeneity in West Lake in the two seasons. Furthermore, environmental factors alone explained a higher proportion of the variation in summer whereas spatial factors explained a higher proportion in winter. These divergences may be related to seasonal environmental changes and anthropogenic disturbances. Our study provided knowledge on BCC spatial heterogeneity in small freshwater habitats and their underlying determinants in different seasons. Keywords Bacterioplankton community composition . Within-lake heterogeneity . Small freshwater habitats . Variance partitioning
Introduction Bacterioplankton are indispensable components of aquatic food webs and key players in structuring the function of freshwater Responsible editor: Diane Purchase Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-08818-w) contains supplementary material, which is available to authorized users. * Jinyong Zhu [email protected] 1
School of Marine Science, Ningbo University, Ningbo 315800, China
2
Hangzhou West Lake Administration, Hangzhou 310002, China
3
College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315800, China
4
Present address: Ningbo, China
ecosystems (Newton et al. 2011). Bacterioplankton are not only important in energy flow and nutrient cycling (Falkowski et al. 2008; Azam et al. 1983) but also sensitive to environmental perturbations, which make them crucial to understand water quality and ecological function of freshwater lakes (Dai
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