Grazing impact of calanoid copepods on phytoplankton size-fractions in Jangmok Bay, south coast of Korea

Title
Grazing impact of calanoid copepods on phytoplankton size-fractions in Jangmok Bay, south coast of Korea
Author(s)
장민철; 신경순; 이우진; 황옥명
KIOST Author(s)
Shin, Kyoung Soon(신경순)
Publication Year
2009-10-29
Abstract
Grazing impacts of calanoid copepods on size-fractionated phytoplankton biomass (chl-a) were measured in the Jangmok Bay of Geoje Island monthly from November 2004 to October 2005. The ingestion rate of calanoid copepods on total phytoplankton biomass ranged between >1 and 215 ng chl/copepod/day during bottle incubations. In grazing experiments on 3 phytoplankton size categories (<3, 3-20 and >20 ㎛), our result indicated microphytoplankton (>20 ㎛) was the primary food source for calanoid copepods. The ingestion rate on microphytoplankton showed a significant increase(r=0.93, p<0.01) with chl-a concentration. Nanophytoplankton (3-20 ㎛) showed negative ingestion rate from June to October 2005 because calanoid copepods consumed their microzooplanktic predators(specially, ciliates). Calanoid copepods were unable to feed efficiently on picophytoplankton(<3 ㎛) due to unfavourable size. Between >0.1-27.7% (average 3.6±15.8%) of phytoplankton biomass were removed daily by calanoid copepods during grazing experiments. High grazing pressure was found in January (27.7%), February (27.4%) and March (15.6%) 2005, but values in other months were low (<5%). Our result suggests calanoid copepods play an important role in controlling the biomass and size structure of phytoplankton in winter and early spring.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/29244
Bibliographic Citation
PICES, pp.141, 2009
Publisher
North Pacific Marine Science Organization
Type
Conference
Language
English
Publisher
North Pacific Marine Science Organization
Related Researcher
Research Interests

Plankton ecology and physiology,Risk assessment,Ship ballast water,플랑크톤 생리, 생태,위해성평가,선박평형수

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