Effects of the changjiang (yangtze) river discharge on planktonic community respiration in the East China Sea

Chung-Chi Chen, Fuh Kwo Shiah, Kuo Ping Chiang, Gwo Ching Gong, W. Michael Kemp

Research output: Contribution to journalArticle

38 Citations (Scopus)

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.

Original languageEnglish
Article numberC03005
JournalJournal of Geophysical Research: Oceans
Volume114
Issue number3
DOIs
Publication statusPublished - 2009 Mar 8

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East China Sea
Yangtze River
respiration
river discharge
Discharge (fluid mechanics)
rivers
China
Phytoplankton
Rivers
Nitrates
Plankton
salinity
Organic carbon
Surface waters
Ecosystems
phytoplankton
Nutrients
Bacteria
Biomass
nitrates

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Effects of the changjiang (yangtze) river discharge on planktonic community respiration in the East China Sea. / Chen, Chung-Chi; Shiah, Fuh Kwo; Chiang, Kuo Ping; Gong, Gwo Ching; Kemp, W. Michael.

In: Journal of Geophysical Research: Oceans, Vol. 114, No. 3, C03005, 08.03.2009.

Research output: Contribution to journalArticle

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