Decomposition of Microcystis blooms: Implications for the structure of the sediment bacterial community, as assessed by a mesocosm experiment in Lake Taihu, China. (23rd August 2012)

• Record Type: Journal Article
• Authors: Shao, Keqiang; Gao, Guang; Chi, Kexu; Qin, Boqiang; Tang, Xiangming; Yao, Xin; Dai, Jiangyu
• Is Part Of: Journal of basic microbiology. Volume 53:issue 6(2013:Jun.)
• Page Start: 549
• Page End: 554
• Publication Date: 2012-08-23
• Subjects: Microbiology -- Periodicals; 579
• DOI: 10.1002/jobm.201100532
• Languages: English
• ISSNs: 0233-111X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="jobm201100532-sec-0001" sec-type="section"> <p>The effect of decomposition of <italic>Microcystis</italic> blooms on the sediment bacterial communities was investigated in a 14‐day mesocosm experiments under dark and anoxic condition with three differing levels of <italic>Microcystis</italic> spp. biomass (from 20 to 2000 µg L⁻¹) as measured by chlorophyll‐<italic>a</italic> (Chl‐<italic>a</italic>) concentration in the water column. Sediment samples were collected on days 0 and 14 for bacterial community composition (BCC) analysis, based on rapid decreases in the Chl‐<italic>a</italic> concentration of water column. The BCC was determined by denaturing gradient gel electrophoresis and sequencing of predominant bands. The results showed that after <italic>Microcystis</italic> decomposition (day 14), the bacterial phylotype diversity in the sediment increased in enclosures with added <italic>Microcystis</italic>, and the relative abundance of bacteria affiliated with <italic>Bacteroidetes</italic> and <italic>Verrucomicrobia</italic> strongly increased. Canonical correspondence analysis showed that organic matter and Chl‐<italic>a</italic> contributed significantly to the changes in sediment bacterial communities during Microcystis decomposition. The present results demonstrate Microcystis decomposition may directly and indirectly influence the BCC of the sediment.</p> </sec> </abstract>