Potential and limitation of algicidal bacteria for controlling natural Stephanodiscus blooms under environmentally realistic exposure conditions

Title
Potential and limitation of algicidal bacteria for controlling natural Stephanodiscus blooms under environmentally realistic exposure conditions
Author(s)
강윤호; 정승원; 최희진; 한명수
KIOST Author(s)
Jung, Seung Won(정승원)
Publication Year
2010-06-18
Abstract
The possible use of algicidal bacteria for the efficient termination of natural freshwater diatom blooms with minimal adverse effects on the freshwater ecosystem was assessed under laboratory and field conditions. The field mesocosm were dosed with single application of isolated SK09 and monitored at Samnagjin in the lower part of the Nakdong River (South Korea) during 12 days of the winter season. We found that the tested bacterium acted against some species of Stephanodiscus- and Aulacoseria-like structure on in vitro and in vivo diatom bloom. However, this bacterium failed to fully control in vivo natural blooms of Stephanodiscus owing to the low water temperatures of <10oC and predation activity of protozooplankton (heterotrophic nanoflagellates and ciliates), and its selective inhibition indirectly affected the decrease of dissolved oxygen levels, the dramatic regeneration of N and P by large-scale Stephanodiscus-lysing process and a great increase in algal biomass of genera Chlamydomonas. This strongly suggests that we need to develop an effective strategy for enhancing the activity of algicidal bacteria and for mitigating some drawbacks to effective and safely regulate natural diatom blooms.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28829
Bibliographic Citation
한국환경생물학회 춘계 학술대회, pp.65, 2010
Publisher
한국환경생물학회
Type
Conference
Language
English
Publisher
한국환경생물학회
Related Researcher
Research Interests

Phytoplatnkon taxonomy,Phytoplatnkon physiology,Phycosphere,식물플랑크톤 분류,식물플랑크톤 생리,식물플랑크톤, 바이러스, 박테리아 관계

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