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Title: Effects of the Changjiang (Yangtze) River discharge on planktonic community respiration in the East China Sea
Authors: Chung-Chi Chen;Fuh-Kwo Shiah;Kuo-Ping Chiang;Gwo-Ching Gong;W. Michael Kemp
Contributors: NTOU:Institute of Marine Environmental Chemistry and Ecology
Keywords: community respiration;primary production;phytoplankton;bacteria;protozoa;nutrients
Date: 2009-03
Issue Date: 2011-10-20T08:22:14Z
Abstract: abstract:Planktonic communities tend to flourish on the western margins of the East China Sea (ECS) fueled by substrates delivered largely from the Changjiang River, the fifth largest river in the world. To study the effects of the Changjiang River discharge on planktonic community respiration (CR), physical-chemical variables and key processes were measured in three consecutive summers in the ECS. Results showed that concentrations of nitrate and Chl a, protozoan biomass, bacterial production, as well as CR in the surface water were all negatively correlated with sea surface salinity, reflecting the strong influence of river discharge on the ECS shelf ecosystem. Moreover, mean values of nitrate, Chl a concentrations, and CR rates were proportionally related to the area of Changjiang diluted water (CDW; salinity ≤31.0 practical salinity units (psu)), an index of river discharge rate. Presumably, higher river flow delivers higher nutrient concentrations which stimulate phytoplankton growth, which in turn fuels CR. CR exhibited significant monthly and interannual variability, and rates appear to be dominated by bacteria and phytoplankton. Although the plankton community was relatively productive (mean = 0.8 mg C m−2 d−1) in the CDW, the mean ratio of production to respiration was low (0.42). This suggests that the heterotrophic processes regulating CR were supported by riverine organic carbon input in addition to in situ autotrophic production.
Relation: 114(C3), pp.C03005
URI: http://ntour.ntou.edu.tw/handle/987654321/25312
Appears in Collections:[海洋環境與生態研究所] 期刊論文
[環境生物與漁業科學學系] 期刊論文

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