Environmental Monitoring and Assessment

, Volume 118, Issue 1–3, pp 355–368 | Cite as

Little Egrets (Egretta Garzetta) and Trace-Metal Contamination in Wetlands of China

  • Y. Zhang
  • L. Ruan
  • M. Fasola
  • E. Boncompagni
  • Y. Dong
  • N. Dai
  • C. Gandini
  • E. Orvini
  • Xavier Ruiz


The rapidly developing Asian countries may face threatening environmental contamination, that however remains largely unassessed. We studied persistent trace elements in three wetlands, Poyang Lake, relatively unpolluted, and Tai Lake, and Pearl River Delta, selected as hotspots of pollution in Central China. We adopted as indicator the Little Egret, a widespread colonial waterbird, and during 1999 and 2000 we collected and analysed the same samples as for a parallel study we conducted in Pakistan, e.g. eggs, body feathers of chicks, prey spontaneously regurgitated by the chicks, and sediments at the areas most used by foraging egrets. The levels of trace-metals at our three study areas were similar, or within the range, of those found in the few other studies for East Asia, with few exceptions. The concentrations of the various elements were below the threshold that may affect the survival or reproduction of the birds, and even the highest concentrations relative to background, i.e. Se in eggs, and Hg in feathers at Pearl Delta, do not pose toxic hazards. In sediments, the levels of trace elements were lower than the critical levels assumed for contaminated soil, except for alarming high levels of As at Poyang. These results do not confirm our expectation, that Poyang was relatively uncontaminated, while Tai and Pearl were polluted. Although trace metal concentration differed significantly among the three study areas, these differences were minor and were not consistent among elements and samples. The bioaccumulation ratios from sediments through prey, feather and egg, were consistent with our previous findings for Pakistan. Only Hg exhibited high bioaccumulation, while Se and Zn had low accumulation, and the other elements no accumulation. This reasserts that feathers of predators such as egrets, may be more sensitive indicators of environmental contamination for the elements subject to bioaccumulation, whereas the sediments or the organisms low in the food chain are better indicators for the other elements.


bioaccumulation China contamination Egretta garzetta trace-elements waterbirds 


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  1. Alloway, B. J. and Ayres, D. C.: 1997, Chemical Principles of Environmental Pollution, Blackie, London.Google Scholar
  2. Boncompagni, E., Muhammad, A., Jabeen, R., Orvini, E., Gandini, C., Sanpera, C., Ruiz, X. and Fasola, M.: 2003, ‘Egrets as monitors of trace-metal contamination in wetlands of Pakistan’, Arch. Environ. Contam. Toxicol. 45, 399–406.CrossRefGoogle Scholar
  3. Burger, J.: 1993, ‘Metals in avian feathers: biondicators of environmetal pollution’, Rev. Environ. Toxicol. 5, 203–311.Google Scholar
  4. Burger, J. and Gochfeld, M.: 1993, ‘Heavy metal and selenium levels in feathers of young egrets and herons from Honk Kong and Szechuam, China’, Arch. Environ. Contam. Toxicol. 25,322–327.CrossRefGoogle Scholar
  5. Burger, J., Parsons,. K., Benson, T., Shukla, T., Rothsyein, D. and Gochfeld, M.: 1992, ‘Heavy metal and selenium levels in young Cattle Egrets from nesting colonies in the Northeastern United States, Puerto Rico and Egypt’, Arch. Environ. Contam. Toxicol. 23, 435–439.Google Scholar
  6. Cai, S., Yue, L., Shang, Q. and Nordberg, G.: 1995, ‘Cadmium exposure among residents in an area contaminated by irrigation water in China’, Bull. World Health Organ. 73, 359–367.Google Scholar
  7. Cardoso da Silva, M.: 1988, ‘Fate of Toxic Metals and Organic Pollutants in the Pearl River Estuary, P.R. China’, Final Report, Rel. 239/98, Laboratorio Nacional Engenharia Civil, Lisboa.Google Scholar
  8. Cheng-xin, F.: 1996, ‘Historical evolution of water ecological setting in Tai Lake’, J. Lake Sci. 8, 297–304 (in Chinese).Google Scholar
  9. Chui, V. W., Lam-Leung, S. Y. and Chan, T. C.: 1991, ‘Residues of polychlorinated biphenyls (PCBs) in fish, water and sediment from Shing Mun River’, Biomed. Environ. Sci. 4, 399–408.Google Scholar
  10. Clarkson, T. W.: 1995, ‘Environmental contaminants in the food chain’, Am. J. Clin. Nutr. 61 (Suppl. 3), 682–686.Google Scholar
  11. Connell, D. W., Wu, R. S., Richardson, B. J., Leung, K., Lam, P. S. and Connell, P. A.: 1998, ‘Fate and risk evaluation of persistent organic contaminants and related compounds in Victoria Harbour, Hong Kong’, Chemosphere 36, 2019–2030.CrossRefGoogle Scholar
  12. Connell, D. W., Wong, B. S. F., Lam, P. K. S., Poon, K. F., Lam, M. H. W., Wu, R. S. S., Richardson, B. J. and Yen, Y. F.: 2002, ‘Risk to breeding success of Ardeids by contaminants in Hong Kong: evidence from trace metals in feathers’, Ecotoxicology 11, 49–59.CrossRefGoogle Scholar
  13. Custer, T. W., Pendleton, G. and Ohlendorf, H. M.: 1990, ‘Within-clutch and among-clutch variation of organochlorine residues in eggs of black-crowned night-herons’, Environ. Monitor. Assess. 15, 83–90.CrossRefGoogle Scholar
  14. del Hoyo J., Elliott A. and Sargatal J.: 1992. Handbook of the Birds of the World. Vol. 1, Lynx Edicions, Barcelona.Google Scholar
  15. Doi, R., Ohno, H. and Harada, M.: 1984, ‘Mercury in feathers of wild birds from the mercury-polluted area along the shore of the Shiranui Sea, Japan’, Sci. Total Environ. 40,155–167.CrossRefGoogle Scholar
  16. Dong, Y., Gong, Z., Wang, H. and An, Q, 2002, ‘Residue and distribution of heavy metals in tissues of night heron chick bred in Yuantouzhu, Wuxi’, Chin. J. Appl. Ecol. 13, 213–216 (in Chinese).Google Scholar
  17. Dong, Y., Wang, H., An, Q., Ruiz, X., Fasola, M and Zhang, Y.: 2004, ‘Residues of organochlorinated pesticides in eggs of water birds from Tai Lake in China’, Environ. Geochem. Health 26, 259–268.CrossRefGoogle Scholar
  18. Erwin, M. and Custer, T. W.: 2000, ‘Herons as indicators’, in: J. A. Kushlan and H. Hafner (eds), Heron Conservation, Academic Press, San Diego, pp. 310–330.Google Scholar
  19. Fujiwara, K.: 1975, ‘Environmental and food contamination with PCB's in Japan’, Sci. Total Environ. 4, 219–247.CrossRefGoogle Scholar
  20. Furness, R. W. and Greenwood, J. J. D.: 1993, Birds as Monitors of Environmental Change, Chapman and Hall, London.Google Scholar
  21. Hafner, H., Fasola, M., Voisin, C. and Kaiser, Y.: 2002, ‘Egretta garzetta Little Egret’, BWP Update. J. Birds Western Palearctic 1, 1–19.Google Scholar
  22. Holm, S.: 1979, ‘A simple sequentially rejective multiple test procedure’, Scan. J. Stat. 6, 65–70.Google Scholar
  23. Honda, K., Min, B. Y. and Tatsukawa, R.: 1986, ‘Distribution of heavy metal and their age-related changes in the Eastern Great White egret Egretta alba modesta, in Korea’, Arch. Environ. Contam. Toxicol. 15, 185–197.CrossRefGoogle Scholar
  24. Ikeda, M.: 1992, ‘Biological monitoring of the general population for cadmium’, IARC Sci. Publ. 118, 65–72.Google Scholar
  25. Jeng, S. L. and Yang, C. P.: 1995, ‘Determination of lead, cadmium, mercury, and copper concentrations in duck eggs in Taiwan’, Poult. Sci. 74, 187–193.Google Scholar
  26. Jung, M. C. and Thornton, I.: 1997, ‘Environmental contamination and seasonal variation of metals in soils, plants and waters in the paddy fields around a Pb—Zn mine in Korea’, Sci. Total Environ. 198, 105–121.CrossRefGoogle Scholar
  27. Kushlan, J. A.: 1993, ‘Colonial waterbirds as bioindicators of environmental change’, Colon. Waterbirds 16, 223–251.CrossRefGoogle Scholar
  28. Lee, D. P., Honda, K., Tatsukawa, R. and Won, P. O.: 1989, ‘Distribution and residue level of mercury, cadmium and lead in Korean birds’, Bull. Environ. Contam. Toxicol. 43, 550–555.CrossRefGoogle Scholar
  29. Nam D.-H., Lee D.-P. and Koo T.-K.: 2004a, ‘Monitoring for lead pollution using feathers of feral pigeons (Columba livia) from Korea’, Environ. Monit. Assess. 95, 13–22.CrossRefGoogle Scholar
  30. Nam D.-H., Lee D.-P. and Koo T.-K.: 2004b, ‘Factors causing variations of lead and cadmium accumulation of feral pigeons (Columba livia)’, Environ. Monit. Assess. 95, 23–35.CrossRefGoogle Scholar
  31. Nordberg, G. F., Jin, T., Kong, Q., Ye, T., Cai, S., Wang, Z., Zhuang, F. and Wu, X.: 1997, ‘Biological monitoring of cadmium exposure and renal effects in a population group residing in a polluted area in China’, Sci. Total Environ. 199, 111–114.CrossRefGoogle Scholar
  32. Pendias, A. K. and Pendias, H.: 1992, Trace Elements in Soils and Plants, 2nd edn, CRC Press, London.Google Scholar
  33. Sanpera, C., Ruiz, X., Jover L., Llorente, G., Jabeen, R., Muhammad, A., Boncompagni, E. and Fasola, M.: 2003, ‘Persistent organic pollutants in Little Egret eggs from selected wetlands in Pakistan’, Arch. Environ. Contam. Toxicol. 44, 360–368.CrossRefGoogle Scholar
  34. Shen, J. H., Gutendorf, B., Vahl, H. H., Shen, L. and Westendorf, J.: 2001, ‘Toxicological profile of polluttants in surface water from an area in Taihu lake, Yangtze Delta’, Toxicology 166, 71–78.CrossRefGoogle Scholar
  35. Xu, S., Jiang, X., Wang, X., Tan, Y., Sun, C., Feng, J., Wang, L., Martens, D. and Gawlik, B. M.: 2000, ‘Persistent polluttants in sediments of the Yangtse river’, Bull. Environ. Contam. Toxicol. 64, 176–183.CrossRefGoogle Scholar
  36. Wang, Y.: 2004, ‘Environmental dgradation and environmental threats in China’, Environ. Monit. Assess. 90, 161–169.CrossRefGoogle Scholar
  37. Yang, H. F., Luo, X. Y., Shen, W., Zhou, Z. F., Jin, C. Y., Yu, F. and Liang, C. S.: 1994, ‘National food contamination monitoring programmes. Levels of mercury, lead and cadmium in Chinese foods’, Biomed. Environ. Sci. 7, 362–368.Google Scholar

Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • Y. Zhang
    • 1
  • L. Ruan
    • 1
  • M. Fasola
    • 2
  • E. Boncompagni
    • 2
  • Y. Dong
    • 3
  • N. Dai
    • 1
  • C. Gandini
    • 4
  • E. Orvini
    • 5
  • Xavier Ruiz
    • 6
  1. 1.School of Life SciencesLanzhou UniversityLanzohuPR China
  2. 2.Dipartimento Biologia AnimaleUniversitàPaviaItaly
  3. 3.Institute of Soil ScienceChinese Academy SciencesNanjingPR China
  4. 4.Dipartimento Chimica FarmaceuticaUniversitàPaviaItaly
  5. 5.Dipartimento Chimica GeneraleUniversitàPaviaItaly
  6. 6.Departamento Biologia AnimalUniversidad de BarcelonaBarcelonaSpain

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