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Influence of phosphorus availability on the community structure and physiology of cultured biofilms

文献类型： 外文期刊

作者： Li, Shuangshuang 1 ; Wang, Chun 2 ; Qin, Hongjie 3 ; Li, Yinxia 4 ; Zheng, Jiaoli 1 ; Peng, Chengrong 1 ; Li, Dunhai 1 ;

作者机构： 1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Peoples R China

2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China

4.Henan Inst Engn, Dept Resource & Environm Engn, Zhengzhou 451191, Peoples R China

5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： Chlorophyll fluorescence;Cultured biofilms;Microbial community structure;Phosphatase activity;Phosphorus availability

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

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收录情况： SCI

摘要： Biofilms have important effects on nutrient cycling in aquatic ecosystems. However, publications about the community structure and functions under laboratory conditions are rare. This study focused on the developmental and physiological properties of cultured biofilms under various phosphorus concentrations performed in a closely controlled continuous flow incubator. The results showed that the biomass (Chl a) and photosynthesis of algae were inhibited under P-limitation conditions, while the phosphatase activity and P assimilation rate were promoted. The algal community structure of biofilms was more likely related to the colonization stage than with the phosphorus availability. Cyanobacteria were more competitive than other algae in biofilms, particularly when cultured under low P levels. A dominance shift occurred from non-filamentous algae in the early stage to filamentous algae in the mid and late stages under P concentrations of 0.01, 0.1 and 0.6 mg/L. However, the total N content, dry weight biomass and bacterial community structure of biofilms were unaffected by phosphorus availability. This may be attributed to the low respiration rate, high accumulation of extracellular polymeric substances and high alkaline phosphatase activity in biofilms when phosphorus availability was low. The bacterial community structure differed over time, while there was little difference between the four treatments, which indicated that it was mainly affected by the colonization stage of the biofilms rather than the phosphorus availability. Altogether, these results suggested that the development of biofilms was influenced by the phosphorus availability and/or the colonization stage and hence determined the role that biofilms play in the overlying water. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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