Abstract
Eutrophication has become increasingly serious and noxious algal blooms have been of more frequent occurrence in the Yangtze River Estuary and in the adjacent East China Sea. In 2003 and 2004, four cruises were undertaken in three zones in the estuary and in the adjacent sea to investigate nitrate (NO3–N), ammonium (NH4–N), nitrite (NO2–N), soluble reactive phosphorus (SRP), dissolved reactive silica (DRSi), dissolved oxygen (DO), phytoplankton chlorophyll a (Chl a) and suspended particulate matter (SPM). The highest concentrations of DIN (NO3–N+NH4–N+NO2–N), SRP and DRSi were 131.6, 1.2 and 155.6 μM, respectively. The maximum Chl a concentration was 19.5 mg m−3 in spring. An analysis of historical and recent data revealed that in the last 40 years, nitrate and SRP concentrations increased from 11 to 97 μM and from 0.4 to 0.95 μM, respectively. From 1963 to 2004, N:P ratios also increased from 30–40 up to 150. In parallel with the N and P enrichment, a significant increase of Chl a was detected, Chl a maximum being 20 mg m−3, nearly four times higher than in the 1980s. In 2004, the mean DO concentration in bottom waters was 4.35 mg l−1, much lower than in the 1980s. In comparison with other estuaries, the Yangtze River Estuary was characterized by high DIN and DRSi concentrations, with low SRP concentrations. Despite the higher nutrient concentrations, Chl a concentrations were lower in the inner estuary (Zones 1 and 2) than in the adjacent sea (Zone 3). Based on nutrient availability, SPM and hydrodynamics, we assumed that in Zones 1 and 2 phytoplankton growth was suppressed by high turbidity, large tidal amplitude and short residence time. Furthermore, in Zone 3 water stratification was also an important factor that resulted in a greater phytoplankton biomass and lower DO concentrations. Due to hydrodynamics and turbidity, the open sea was unexpectedly more sensitive to nutrient enrichment and related eutrophication processes.
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References
Abril G., Nogueira M., Etcheber H., Cabecadas G., Lemaire E. and Brogueira M. J. (2002). Behaviour of organic carbon in nine contrasting European Estuaries. Estuarine, Coastal and Shelf Science 54: 241–262
Artigas L.F. (1998). Seasonal variability in microplanktonic biomasses in the Gironde dilution plume (Bay of Biscay): relative importance of bacteria. Oceanologica Acta 21(4): 563–580
Barnes H. (1959). Apparatus and Methods of Oceanography. Part One: Chemical. George Allen and Unwin Ltd, London, 341
Bearsdley R. C., Limeburner R., Yu H. and Cannon G. A. (1985). Discharges of Changjiang (Yangtze River) into the East China Sea. Continental Shelf Research 4: 55–76
Billen G., Lancelot C., Becker E. D. and Servais P. (1988). Modelling microbial processes (phyto- and bacterioplankton) in the Schelde Estuary. Hydrobiological Bulletin 22: 43–55
Cabecadas G., Nogueira M. and Brogueira M. J. (1999). Nutrient dynamics and productivity in three European estuaries. Marine Pollution Bulletin 38: 1092–1096
Cai Y. M., Ning X. R. and Liu Z. L. (2002). Studies on primary production and new production of the Zhujiang Estuary, China. Acta Oceanlogica Sinica 24(3): 101–111 (in Chinese with English abstract)
Chen C., Zhu J., Beardsley C. R. and Franks P. J. S. (2003). Physical–biological sources for dense algal blooms near the Changjiang River. Geophysical Research Letters 30: 1515–1518
Cloern J. E. (2001). Our evolving conceptual model of the coastal eutrophication problem. Marine Ecology Progress Series 210: 223–253
Conley D. J., Chelske L. C. and Stoermer E. F. (1993). Modification of the biogeochemical cycle of silica with eutrophication. Marine Ecology Progress Series 101: 179–192
Conley D. J., Stalnacke P., Pitkänen H. and Wilander A. (2000). The transport and retention of dissolved silicate by rivers in Sweden and Finland. Limnology and Oceanography 45: 1850–1853
DeMaster D. J. and Pope R. H. (1996). Nutrient dynamics in Amazon waters: results from AMASSEDS. Continental Shelf Research 16: 263–289
Dortch Q. and Whitledge T. E. (1992). Does nitrogen or silicon limit phytoplankton production in the Mississippi River plume and nearby regions?. Continental Shelf Research 12: 1293–1309
Edmond J. M., Spivack A., Grand A. C., Hu M. H. and Chen Z. X. (1985). Chemical dynamics of the Changjiang estuary. Continental Shelf Research 4: 17–36
Essink K. (2003). Response of an estuarine ecosystem to reduced organic waste discharge. Aquatic Ecology 37: 65–76
Fisher T. R., Harding L. W., Stanley D. W. and Ward L. G. (1988). Phytoplankton, nutrients and turbidity in the Chesapeake, Delaware, and Hudson estuaries. Estuarine, Coastal and Shelf Science 27: 61–93
Garnier J., Billen G. and Palfner L. (2000). Understanding the oxygen budget and related ecological processes in the river Mosel: the RIVERSTRAHLER approach. Hydrobiologia 410: 151–166
Grasshoff K. (1976). Methods of Seawater Analysis. Verlag Chemie, Weinheim New York, 276–281
Gu X. K. (1980). The maximum value of dissolved oxygen in its vertical distributin in Yellow Sea. Acta Oceanologica Sinica 2(2): 70–80 (in Chinese with English abstract)
Gu X. K., Xiong X. X., Liu M. X. and Li Y. (1981). Mainre geochemistry of nitrogen near estuary of Yangtze River. Nitrate in sea water near estuary. Journal of Shangdong College of Oceanology 11: 37–46 (in Chinese with English abstract)
Gu X. K., Ma X. N., Shen W. R., Ren G. F., Chen Z., Diao H. X., Li H. J. and Zhang L. Y. (1982). Mainre geochemistry of nitrogen near estuary of Changjiang River. Nitrite and ammonia in sea water near estuary. Journal of Shangdong College of Oceanology 12: 31–38 (in Chinese with English abstract)
Han X. R., Wang X. L., Sun X., Shi X. Y., Zhu C. J., Zhang C. S. and Lu R. (2003). Nutrient distribution and its relationship with occurrence of red tide in coastal area of East China Sea. Chinese Journal of Applied Ecology 14: 1097–1101 (in Chinese with English abstract)
Heil C. A., Glibert P. M. and Fan C. (2005). Prorocentrum minimum (Pavillard) Schiller. A review of a harmful algal bloom species of growing worldwide importance. Harmful Algae 4: 449–470
Hellings L., Dehairs F., Tackx M., Keppens E. and Baeyens W. (1999). Origin and fate of organic carbon in the freshwater part of the Scheldt Estuary as traced by stable carbon isotope composition. Biogeochemistry 47: 167–186
Hu M. H., Yang Y. P., Xu C. L. and Harrsion J. P. (1989). Phosphate limitation of phytoplankton growth in Yangtze River Estuary. Acta Oceanologica Sinica 11: 439–443 (in Chinese)
Huang S. G., Yang J. D., Ji W. D., Yang X. L. and Chen G. X. (1986). Spatial and temporal variation of reactive Si, N, P and their relationship in the Changjiang Estuary water. Taiwan Strait 5: 114–123 (in Chinese with English abstract)
Huang X. P., Huang L. M. and Yue W. Z. (2003). The characteristics of nutrients and eutrophication in the Pearl River estuary, South China. Marine Pollution Bulletin 47: 30–36
Huang Q. H., Shen H. T., Liu X. C. and Fu R. B. (2001). Human impact on the nitrate flux to the Changjiang estuary. Resources and Environment in the Yangtze Basin 10: 565–569 (in Chinese with English abstract)
Humborg C. (1997). Primary productivity regime and nutrient removal in the Danube estuary. Estuarine, Coastal and Shelf Science 45: 579–589
Humborg C., Ittekkot V., Cociasu A. and Bodungen B. (1997). Effect of Danube River dam on Black Sea biogeochemistry and ecosystem structure. Nature 386: 385–388
Irigoien X. and Castel J. (1997). Light limitation and distribution of chlorophyll pigments in a highly turbid estuary: the Gironde (SW France). Estuarine, Coastal and Shelf Science 44: 507–517
Justic D., Rabalais N. N., Turner R. E. and Dortch Q. (1995). Changes in nutrient structure of river-dominated coastal waters: stoichiometric nutrient balance and its consequences. Estuarine, Coastal and Shelf Science 40: 339–356
Lemaire E., Abril G., Wit R. D. and Etcheber H. (2002). Distribution of phytoplankton pigments in nine European estuaries and implications for an estuarine typology. Biogeochemistry 59(1–2): 5–23
Li D. J., Zhang J., Huang D. J., Wu Y. and Liang J. (2002). Oxygen depletion off the Changjiang (Yangtze River) Estuary Science in China. Series D: Earth Sciences 45: 1137–1146
Li J. F. and Zhang C. (1998). Sediment resuspension and implications for turbidity maximum in the Changjiang Estuary. Marine Geology 148: 117–124
Li M. T. and Cheng H. Q. (2001). Changes of dissolved silicate flux from the Changjiang River into sea and its influence since late 50 years. China Environmental Science 21(3): 193–197 (in Chinese with English abstract)
Lin Y. A., Su J. L., Hu C. Y., Zhang M., Li Y., Guan B. W. and Chen J. Z. (2004). N and P in waters of the Zhujiang River Estuary in summer. Acta Oceanologica Sinica 26: 63–73 (in Chinese with English abstract)
Lin Y. A., Tang R. Y., Li Y., Dong H. L., Guan X. W. and Chen Y. Z. (1995). Biogeochemical characteristics of biogenic elements and their relation with flocculation and settling. Acta Oceanologica Sinica 17: 66–72 (in Chinese)
Liu C., He Y., Li J. H. and Wei H. P. (2003). Numerical simulation on pollutant tracking released from the sewage outfalls in Shanghai. Shuili Xuebao 4: 114–118 (in Chinese with English abstract)
Liu H. B. and Dagg M. (2003). Interactions between nutrients, phytoplankton growth and micro- and mesozooplankton grazing in the plume of the Mississippi River. Marine Ecology-Progress Series 258: 31–42
Margalef, R., 1998. Red tides and ciguatera as successful ways in the evolution and survival of an admirable old phylum. In Reguera, B., J. Blanco, L.M. Fernández, T. Wyatt (eds), Harmful algae. Xunta de Galicia Intergovernmental Oceanographic Commission of UNESCO, 3–7 pp
Meng W., Qin Y. W., Zheng B. H., Fu G., Li Z. C., Lei K. and Zhang L. (2004). Analysis of nitrogen, phosphorus nutrients and COD in waters of Yangtze River Estuary. Environmental Science 25(6): 65–68 (in Chinese with English abstract)
Milliman J. D., Bearsdley R. C., Yang Z. S. and Limeburner R. (1985). Modern Huanghe-derived mud from the outer shelf of the East China Sea: identification and potential transport mechanisms. Continental Shelf Research 4: 175–188
Monbet Y. (1992). Control of phytoplankton biomass in estuaries: a comparative analysis of microtidal and macrotidal estuaries. Estuaries 15: 563–571
Moncheva S., Gotsis-Skretas O., Pagou K. and Krastev A. (2001). Phytoplankton blooms in Black Sea and Mediterranean coastal ecosystems subjected to anthropogenic eutrophication: similarities and differences. Estuarine, Coastal and Shelf Science 53: 281–295
Ning X. R., Vaulot D., Liu Z. S. and Liu Z. L. (1988). Standing stock and production of phytoplankton in the estuary of the Changjiang (Yangtse River) and the adjacent East China Sea. Marine Ecology-Progress Series 49: 141–150
Nixon S. W. (1995). Coastal marine eutrophication: a definition, social causes and future concerns. Ophelia 41: 199–219
Pai S. C., Yang C. C. and Reliey J. P. (1990). Formation kinetics of the pink azo dye in the determination of nitrite in the natural waters. Analytica Chimica Acta 232: 345–349
Parsons, T. R., Y. Maitas, C. M. Lalli, 1984. A Manual of Chemical and Biological Methods for Seawater Analysis. Pergamon Press, 173 pp
Pu X. M., Wu Y. L. and Zhang Y. S. (2001). Nutrient limitation of phytoplankton in the Changjiang estuaryII. Condition of nutrient limitation in spring. Acta Oceanologica Sinica 23: 57–65 (in Chinese with English abstract)
Qi D. M., Shen H. T. and Zhu J. R. (2003). Flushing time of the Yangtze Estuary by discharge: a model study. Journal of Hydrodynamics Series B.3: 63–71
Redfield, A. C., B. H. Ketchum & F. A. Richards, 1963. The influence of organism on the composition of seawater. In Hill, M. N. (ed.), The Sea, Vol. 2. John Wiley, New York: 26–77
Ren G. F. (1992). Distribution and variation of dissolved oxygen in the Changjiang River Estuary and its adjacent waters. Studia Marina Sinica 33: 139–151 (in Chinese with English abstract)
Sanders R., Jickells T. and Mills D. (2001). Nutrients and chlorophyll at two sites in the Thames plume and southern North Sea. Journal of Sea Research 46: 13–28
Shen H. T. and Pan D. A. (2001). Turbidity Maximum in the Changjiang Estuary. China Ocean Press, Beijing pp. 39–61 (in Chinese)
Shen X. Q. and Hu F. X. (1995). Basic characteristics of distribution of chlorophyll a in the Changjiang estuary. Journal of Fishery Sciences of China 2: 71–80 (in Chinese with English abstract)
Shen X. Q., Jiang M. and Yuan Q. (1999). Study on dirstribution of chlorophyll a in the Changjiang estuary. Journal of Fishery Sciences of China 6: 1–6 (in Chinese with English abstract)
Shen Z. L., Lu J. P., Liu X. J. and Diao H. X. (1992). Distribution characters of the nutrients in the Changjiang River Estuary and the effect of the Three Gorges Project on it. Studia Marina Sinica 33: 109–129 (in Chinese with English abstract)
Shi X. Y., Wang X. L., Han X. R., Zhu C. J., Sun X. and Zhang C. S. (2003). Nutrient distribution and controlling mechanism in the adjacent area of Changjiang River estuary. Chinese Journal of Applied Ecology 14: 1086–1092 (in Chinese with English abstract)
Shi Z. (2004). Behavior of fine suspended sediment at the North passage of the Changjiang Estuary. China Journal of Hydrology 293: 180–190
Smith W. O. and DeMaster D. J. (1996). Phytoplankton biomass and productivity in the Amazon River plume: correlation with seasonal river discharge. Continental Shelf Research 16: 291–319
Strickland J. D. H and Parsons T. R. (1972). A practical handbook of seawater analysis. Fisheries Research Board of Canada Bulletin 167: 311
Tian R. C., Hu F. X. and Martin J. M (1993). Summer nutrient fronts in the Changjiang (Yangtze River) Estuary. Estuarine, Coastal and Shelf Science 37: 27–41
Turner R. E. and Rabalais N. N. (1994). Coastal eutrophicaition near the Mississippi river delta. Nature 168: 619–621
Berger G. W., Helder W. and DeVries R. T. P. (1978). Nutrients distributions in the Zaire estuary and river plume. Netherlands Journal of Sea Research 12: 296–323
Vollenweider R. A., Marchetti R. and Viviani R. (1992). Marine Coastal Eutrophication. The Response of Marine Transitional Systems to Human Impact: Problems and Propectives for Restoration. Science of Total Environment. Suppl. Elsevier Science, Amsterdam, The Netherlands pp. 1310
Wang B. D. (2003). Nutrient distribution and their limitation on phytoplankton in the Yellow Sea and the East China Sea. Chinese Journal of Applied Ecology 14: 1122–1126 (in Chinese with English abstract)
Wang J. H., Huang Q. Q., Liu A. C. and Zhang Y. F. (2004). Tendency of biodiversity variation nearby Changjiang estuary. Marine Science Bulletin 23: 32–39 (in Chinese with English abstract)
Wolff, W. J., 1980. Biotic aspects of the chemistry of estuaries. In Olausson, E. & I. Cato (eds), Chemistry and Biogeochemistry of Estuaries, Wiley and Sons, pp. 263–295
Zhong Y. X., Yang H. S., Zhao L. Q. and Han J. D. (1999). Study on dynamic of N and P in Changjiang estuary. Journal of Fishery Sciences of China 6: 6–9 (in Chinese with English abstract)
Zhou M. J., Yan T. and Zou J. Z. (2003). Preliminary analysis of the characteristics of red tide areas in Changjiang River estuary and its adjacent sea. Chinese Journal of Applied Ecology 14: 1031–1038 (in Chinese with English abstract)
Zhou W. H., Yuan X. C., Huo W. Y. and Yin K. D. (2004). Distribution of chlorophyll a and primary productivity in the adjacent sea area of Changjiang River Estuary. Acta Oceanologica Sinica 26: 142–150
Zimmerman, A. R. and E. A. Canuel, 2000. A geochemical record of eutrophication and anoxia in Chesapeake Bay sediments: anthropogenic influence on organic matter composition. Marine Chemistry 69: 117-137.
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Chai, C., Yu, Z., Song, X. et al. The Status and Characteristics of Eutrophication in the Yangtze River (Changjiang) Estuary and the Adjacent East China Sea, China. Hydrobiologia 563, 313–328 (2006). https://doi.org/10.1007/s10750-006-0021-7
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DOI: https://doi.org/10.1007/s10750-006-0021-7