Ecological assessment of an algaecidal naphthoquinone derivate for the mitigation of Stephanodiscus within a mesocosm

Jae-Hyoung Joo; Zhen Kuang; Pengbin Wang; Bum Soo Park; Shailesh Kumar Patidar; Myung-Soo Han

doi:10.1016/j.envpol.2017.02.045

Ecological assessment of an algaecidal naphthoquinone derivate for the mitigation of Stephanodiscus within a mesocosm

Environ Pollut. 2017 Oct:229:735-745. doi: 10.1016/j.envpol.2017.02.045. Epub 2017 Jun 7.

Authors

Jae-Hyoung Joo¹, Zhen Kuang², Pengbin Wang¹, Bum Soo Park³, Shailesh Kumar Patidar¹, Myung-Soo Han⁴

Affiliations

¹ Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea.
² Department of Environment Science, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea.
³ Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea; Research Institute for Natural Sciences, Hanyang University, Seoul 133-791, South Korea.
⁴ Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea; Department of Environment Science, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea; Research Institute for Natural Sciences, Hanyang University, Seoul 133-791, South Korea. Electronic address: hanms@hanyang.ac.kr.

PMID: 28596061
DOI: 10.1016/j.envpol.2017.02.045

Abstract

The novel eco-friendly algaecidal naphthoquinone derivate was used to control harmful algal bloom causing species Stephanodiscus and, its effect was assessed on other undesired and non-targeted microbial communities. We conducted a mesocosm experiment to investigate the effects of this novel algaecide on native microbial communities rearing in water collected from Nakdonggang River. Upon treatment of the mesocosm with the naphthoquinone derivate the concentration of Chl-a decreased from 20.4 μg L^-1 to 9.5 μg L^-1 after 2 days. The turbidity has also shown decrement (exhibited 15.5 NTU on the 7th day). The concentrations of DOC and phosphate in the treatment were slightly higher than those in the control due to the decomposition of dead Stephanodiscus, whereas the DO and pH in the treated condition were slightly lower than those in the control; which was due to increment of organic acids and higher degradation activity. Results showed that bacterial abundance were not significantly different but community composition were slightly different as revealed by NGS (Next generation sequencing). The variation in HNF (Heterotrophic nanoflagellates) revealed that the bacterial community composition changed following the change in bacterial abundance. During the treatment, the abundance of Stephanodiscus was significantly reduced by more than 80% after 6 days, and the abundance of ciliates and the dominant species, Halteria grandinella, had shown marked decline. The abundance of zooplankton sharply decreased to 5 ind. L^-1on the 8th day but increased again by the end of the study period. The Shannon-Wiener diversity index of phytoplankton, ciliates and zooplankton in the treated mesocosm increased significantly after 4, 7 and 8 days, respectively. The marked changes in the ecosystem structure were observed in treatment compare to control. However, the beneficial microalgal populations were not affected which indicated possibility of restoration of treated ecosystem and regain of healthy community structure after certain period.

Keywords: Mesocosm; Microbial community structure; Novel algicidal substance naphthoquinone derivate; Stephanodiscus hantzschii.

MeSH terms

Animals
Ciliophora
Diatoms / physiology*
Disinfectants / analysis
Disinfectants / toxicity*
Ecology
Ecosystem
Harmful Algal Bloom
Heterotrophic Processes
High-Throughput Nucleotide Sequencing
Naphthoquinones / analysis
Naphthoquinones / toxicity*
Phytoplankton / metabolism
Risk Assessment
Zooplankton

Substances

Disinfectants
Naphthoquinones