Abstract
The bacterial community composition in water and sediment samples during the decomposition of Microcystis biomass were analyzed using the 454 pyrosequencing technique. We found dramatic shifts in the bacterial community composition of water and sediments after the addition of Microcystis biomass. Among all the detected phyla, only Firmicutes was found to be dominant in both water and sediment samples. The genus Clostridium sensu stricto was the absolutely dominant group in Firmicutes and showed drastic variations with incubation time during the decomposition process. Peak values in relative abundance of Clostridium sensu stricto appeared in the first few days for water and sediment samples. Environmental factors such as pH, dissolved oxygen (DO), and dissolved organic carbon (DOC) in water samples showed drastic variations during the decomposing process, which might be the prominent forces driving the variation of bacterial communities. The abundant genus, Clostridium sensu stricto, were thought to be well adapted to higher DOC and turbidity and lower pH and DO conditions. Compared with the sediment samples, the decomposition of Microcystis biomass had greater influence on the bacterial community composition in water and Clostridium sensu stricto might play important roles in the process of Microcystis biomass decomposition.
Highlights
Bacteria constitute a crucial component of aquatic ecosystems and play important roles in transforming phytoplankton-derived organic matter [1,2]
Lake Taihu (N 31 ̊29014@, E 120 ̊12041@) is a large shallow eutrophic freshwater lake located in eastern China and dominated by intensive cyanobacteria blooms, especially Microcystis blooms, which could form heavy scum in some areas of the lake [12, 19]
The measured chemical factors of H treatment always showed extreme values on day 2 or day 5 and had higher concentrations of dissolved organic carbon (DOC) and lower pH, dissolved oxygen (DO), and oxidation reduction potential (ORP) in water compared with the control group at the initial decomposition days (Fig 1A)
Summary
Bacteria constitute a crucial component of aquatic ecosystems and play important roles in transforming phytoplankton-derived organic matter [1,2]. Cyanobacterial blooms, especially Microcystis blooms, are frequently found in eutrophic freshwater ecosystems and can pose notable risks to ecological and human health [3,4,5]. Bacterial communities associated with marine phytoplankton blooms [2, 6,7] and bloom-forming freshwater phytoplankton in growing stage [1, 8] have received considerable attention. Only a few studies have examined the bacterial community composition in response to the breakdown of algal blooms in freshwater lakes [9,10,11].
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