Ecological anomalies in the East China Sea: impacts of the Three Gorges Dam?

In this study, we examined possible impacts of the Yangtze River Three Gorges Dam (TGD), the world largest hydroelectric construction, on the adjacent marine ecosystem of the East China Sea (ECS) during its initial water storage period. The TGD filled the first one-third of its storage capacity of 39 billion m3 in 10 days in June 2003, causing an abrupt reduction in the river flow into the ECS. Noticeable changes in the microbial community structure including pico-sized autotrophs, heterotrophic bacteria and microbial diversity in the estuary and the ECS were observed 2 months later. Although causes for these changes could be multiple, the sudden decrease of river runoff and an ensuing intrusion of ECS ocean currents were postulated to be among the major ones.

[1]  Masataka Watanabe,et al.  Dynamics of autotrophic picoplankton and heterotrophic bacteria in the East China Sea , 2005 .

[2]  F. Hagen,et al.  Typical freshwater bacteria: an analysis of available 16S rRNA gene sequences from plankton of lakes and rivers , 2002 .

[3]  Sallie W. Chisholm,et al.  Phytoplankton population dynamics at the Bermuda Atlantic Time-series station in the Sargasso Sea , 2001 .

[4]  G. Gong,et al.  Reduction of primary production and changing of nutrient ratio in the East China Sea: Effect of the Three Gorges Dam? , 2006 .

[5]  S. Murakami,et al.  Bacterial Distribution and Phylogenetic Diversity in the Changjiang Estuary before the Construction of the Three Gorges Dam , 2002, Microbial Ecology.

[6]  M. Mcphaden.  Evolution of the 2002/03 El Niño* , 2003 .

[7]  A. Mishonov,et al.  Remote sensing and surface POC concentration in the South Atlantic , 2003 .

[8]  Gwo-Ching Gong,et al.  Chemical hydrography and chlorophyll a distribution in the East China Sea in summer: implications in nutrient dynamics , 1996 .

[9]  J. Thompson,et al.  The CLUSTAL_X windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools. , 1997, Nucleic acids research.

[10]  Remo Guidieri.  Res , 1995, RES: Anthropology and Aesthetics.

[11]  S. Chao,et al.  The Kuroshio edge exchange processes (KEEP) study — an introduction to hypotheses and highlights , 2000 .

[12]  Xianqiang He,et al.  Water-transparency (Secchi Depth) monitoring in the China Sea with the SeaWiFS satellite sensor , 2004, SPIE Remote Sensing.

[13]  D. Vaulot,et al.  Annual variability of phytoplankton and bacteria in the subtropical North Pacific Ocean at Station ALOHA during the 1991–1994 ENSO event , 1997 .

[14]  R. Olson,et al.  Spatial and temporal distributions of prochlorophyte picoplankton in the North Atlantic Ocean , 1990 .

[15]  G. Zwart,et al.  Patterns and governing forces in aquatic microbial communities , 1998, Aquatic Ecology.

[16]  R. Murtugudde,et al.  Sea surface salinity changes in the East China Sea during 1997–2001: Influence of the Yangtze River , 2002 .

[17]  J. Handelsman,et al.  Introducing DOTUR, a Computer Program for Defining Operational Taxonomic Units and Estimating Species Richness , 2005, Applied and Environmental Microbiology.

[18]  G. Alory,et al.  TOPEX/Poseidonデータ及び線形モデル結果(1964~1999年)による,熱帯太平洋の経年的海水準変動と関連する質量輸送 , 2002 .

[19]  W. Liu,et al.  A New Study of the Mediterranean Outflow, Air-Sea Interactions, and Meddies Using Multisensor Data , 2006 .

[20]  Bin Kang,et al.  Jellyfish Blooms in the Yangtze Estuary , 2005, Science.

[21]  G. Gong,et al.  Dissolved iodine species in the East China Sea—a complementary tracer for upwelling water on the shelf , 2004 .

[22]  D. Vaulot,et al.  Annual variability of picoplankton in the subtropical North Pacific Ocean at Station ALOHA , 1997 .

[23]  D. Vaulot,et al.  Photosynthetic picoplankton community structure in the subtropical North Pacific Ocean near Hawaii (station ALOHA) , 1993 .

[24]  M. Rodier,et al.  Effect of El Niño Southern Oscillation events on the distribution and abundance of phytoplankton in the Western Pacific Tropical Ocean along 165°E , 1992 .

[25]  H. Koshikawa,et al.  Influence of hydrographic conditions on picoplankton distribution in the East China Sea , 2002 .

[26]  D. Vaulot,et al.  Enumeration and Cell Cycle Analysis of Natural Populations of Marine Picoplankton by Flow Cytometry Using the Nucleic Acid Stain SYBR Green I , 1997, Applied and environmental microbiology.