Ecotoxicology

, Volume 15, Issue 1, pp 83–96 | Cite as

Contamination and Biomarkers in the Great Blue Heron, an Indicator of the State of the St. Lawrence River

  • Louise Champoux
  • Jean Rodrigue
  • Suzanne Trudeau
  • Monique H. Boily
  • Philip A. Spear
  • Alice Hontela
Article

Abstract

In 1996–1997, nine breeding colonies of the great blue heron on the St. Lawrence River and its estuary (Québec, Canada) were investigated in the framework of a biomonitoring program. Fledglings from colonies in freshwater were more contaminated with mercury, PCBs and many organic contaminants than those from estuarine colonies. The level of contamination in the St. Lawrence River is generally below the levels of toxicological effects for the great blue heron. The molar ratio of retinol: retinyl palmitate in heron eggs was correlated with total PCBs (r=0.79) and Mirex (r=0.90). In plasma, all biochemical parameters were significantly different between freshwater and marine colonies. Plasma retinol concentrations at the Dickerson and Hérons colonies were significantly lower compared with those at Grande Ile (p<0.05) and Steamboat (p<0.001). Based on retinoid and β-carotene concentrations in eggs, low plasma retinol was not associated with possible dietary deficiency. Plasma retinol was negatively correlated with many PCB congeners, total PCBs (r=−0.78), p,p′-DDE, trans-nonachlor and α-HCH. Similarly, the hormone T3 was correlated with many PCB congeners, total PCBs (r=−0.69) and the same organochlorine chemicals. Plasma LDH concentrations were different among freshwater colonies, Grande Ile and Hérons colonies having LDH values significantly greater than those of Steamboat (respectively, p<0.05 and p<0.01). Globally, the health status of the St. Lawrence great blue heron population was judged to be acceptable, however, several biomarkers indicated positive responses to contaminants.

Keywords

contaminants vitamin A thyroid hormones great blue heron St. Lawrence River 

Notes

Acknowledgments

The authors acknowledge the contributions of S. Guay, P. Labonté, B. Jobin, P. Sylvain, A. Émery, J. Comtois, J. Rosa and G. Paquin for assistance in field work. We thank P. Pike and H. Lickers, from the Mohawk Council of Akwesasne, for their assistance in sampling at Dickerson Island. Chemical analyses were performed at the Canadian Wildlife Service National Wildlife Research Centre. The study was supported by the Canadian Wildlife Service of Environment Canada and the St. Lawrence Vision 2000 Action Plan.

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Louise Champoux
    • 1
  • Jean Rodrigue
    • 1
  • Suzanne Trudeau
    • 2
  • Monique H. Boily
    • 3
  • Philip A. Spear
    • 3
  • Alice Hontela
    • 4
  1. 1.Environment Canada, Canadian Wildlife ServiceSte-FoyCanada
  2. 2.Environment Canada, National Wildlife Research CentreOttawaCanada
  3. 3.Département des sciences biologiques et Centre TOXENUniversité du Québec à MontréalMontréalCanada
  4. 4.Department of Biological Sciences, Water Institute for Semi-arid Ecosystems (WISE)University of LethbridgeLethbridgeCanada

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