Effects of the algicide, thiazolidinedione derivative TD49, on microbial communities in a mesocosm experiment

Title
Effects of the algicide, thiazolidinedione derivative TD49, on microbial communities in a mesocosm experiment
Authors
한명수
Keywords
Bacteria; Nanoflagellate; Red tide organism; Algicide; Time lag; Microbial loop
Issue Date
2015-03
Publisher
SPRINGER
Citation
ENVIRONMENTAL MONITORING AND ASSESSMENT, v. 187, NO 4, Page. 160-169
Abstract
We investigated the effects of the algicide thiazolidinedione derivative TD49 on microbial community in mesocosm experiments. The TD49 concentration exponentially decreased over time, with half-life of 3.5 h, following addition in the seawater (R-2=0.98, P˂0.001). Among microbial communities, heterotrophic bacteria and heterotrophic nanoflagellates (HNFs) grew well in all treatments following the addition of TD49. The abundance of HNFs lagged behind the increase in heterotrophic bacteria by 24 h in the 0.2 and 0.4 mu M TD49 concentrations (R-2=0.28, P˂0.05), and by 48 h in the 0.6 and 1.0 mu M TD49 concentrations (R-2=0.30, P˂0.05). This implies a strong concentration-dependent top-down effect of TD49 on microbial communities, with indications that the degradation of planktonic organisms, including the target alga, led to high heterotrophic bacteria concentrations, which in turn stimulated the population growth of predatory HNF. However, total ciliate numbers remained relatively low in the TD49 treatments relative to the control and blank groups, suggesting limited carbon flow from bacteria to these grazers even though the abundance of aloricate ciliates gradually increased toward the end of the experimental period, particularly at the high TD49 concentrations. TD49 appears to provide an environmentally safe approach to the control of harmful algal blooms (HABs) in aquatic ecosystems.
URI
http://link.springer.com/article/10.1007/s10661-015-4367-zhttp://hdl.handle.net/20.500.11754/22899
ISSN
0167-6369; 1573-2959
DOI
http://dx.doi.org/10.1007/s10661-015-4367-z
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > LIFE SCIENCE(생명과학과) > Articles
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