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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Mar 2011, 32 (2)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Shift in nutrient and plankton community in eutrophic lake following

introduction of a freshwater bivalve

 

Author Details

 

Soon-Jin Hwang

Department of Environmental Science, Konkuk University, Seoul 143 701, Republic of Korea

Ho-Seob Kim

Department of Environmental Science, Konkuk University, Seoul 143 701, Republic of Korea

Jung-Hwan Park

Department of Environmental Science, Konkuk University, Seoul 143 701, Republic of Korea

Baik-Ho Kim

(Corresponding author)

Department of Environmental Science, Konkuk University, Seoul 143 701, Republic of Korea

e-mail: oeloel@konkuk.ac.kr

 

 

 

Publication Data

Paper received:

12 October 2009

 

Revised received:

28 February 2010

 

Accepted:

19 April 2010

 

Abstract

 

The impact of the freshwater bivalve Corbicula leana on plankton community dynamics was examined during a cyanobacterial bloom period. Nutrient and chlorophyll concentrations, primary productivity, and phytoplankton and zooplankton communities in the experimental enclosures were measured at 2-3 day intervals. The introduction of mussels reduced net primary productivity and phytoplankton and chlorophyll. Chlorophyll decreased immediately following addition of 100 mussels and then increased over time. After 600 mussels were added, chlorophyll decreased continuously from 87 to 25 mg l-1, approaching that in the mussel-free enclosure. Simultaneously, water transparency increased and concentrations of suspended solids and total phosphorus decreased. Mussel addition caused short-term increases in nutrient concentrations, especially following high-density treatment: phytoplankton density decreased, while cell density in the mussel-free enclosure increased. Zooplankton densities in the two enclosures were similar; however, carbon biomass in the mussel enclosure increased, associated with an increase in large zooplankton. The trophic relationship between phytoplankton and zooplankton was positive in the mussel-free enclosure and negative in the mussel-treatment enclosure, possibly reflecting effects of mussels on both consumer and resource control in the plankton community. Thus, filter feeding by Corbicula affects nutrient recycling and plankton community structure in a freshwater ecosystem through direct feeding and competition for food resources.

 

Key words

Filter-feeding bivalve, Corbicula leana, Hypertrophic lake, Plankton

 

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