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Compromised immune competence in free-living tree swallows exposed to mercury - Ecotoxicology

  • ️Cristol, Daniel A.
  • ️Thu Mar 26 2009

Abstract

Mercury is a pervasive environmental contaminant and a well-documented immunosuppressor. However, little is known about the effects of mercury contamination on health of free-living vertebrate populations. The South River in Virginia, USA was heavily contaminated with industrial mercury from 1929 to 1950, and recent studies have documented high levels of circulating mercury in riparian songbirds breeding below the site of contamination. Here we used two standardized immune assays, mitogen-induced swelling in response to phytohaemagglutinin (PHA) and antibody response to sheep red blood cells (SRBCs), to test for effects of mercury toxicity on the immune system of female tree swallows (Tachycineta bicolor) which feed on terrestrial and aquatic insects along the contaminated waterway. We found that females breeding at mercury-contaminated sites mounted significantly weaker PHA-induced swelling responses than those at reference sites in both years of study. However, among females on the contaminated sites, individual bloodstream mercury concentration did not predict the extent of mitogen-induced swelling. We did not detect any differences between reference and contaminated females in the strength of antibody responses to SRBCs, but sample sizes for this assay were significantly smaller. Overall, our results suggest that mercury toxicity can exert sub-lethal immunosuppression in free-living, insectivorous songbirds. The potential fitness consequences of the detected differences in immunocompetence caused by mercury toxicity warrant further study.

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Acknowledgments

Funding was provided by E.I. DuPont de Nemours and Company and the Vice Provost for Research at College of William & Mary and NSF UBM 0436318. We thank the South River Science Team, Rebecka Brasso, Anne Condon, Rachel Fovargue, Adrian Monroe, Robert Taylor and the many cooperative landowners in the Shenandoah Valley. Two anonymous reviewers helped to improve the manuscript.

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Authors and Affiliations

  1. Department of Biological Sciences, Virginia Tech, 4036 Derring Hall, Blacksburg, VA, 24061, USA

    Dana M. Hawley

  2. Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, P.O. Box 8795, Williamsburg, VA, 23187, USA

    Kelly K. Hallinger & Daniel A. Cristol

Authors

  1. Dana M. Hawley

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  2. Kelly K. Hallinger

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  3. Daniel A. Cristol

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Correspondence to Dana M. Hawley.

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Hawley, D.M., Hallinger, K.K. & Cristol, D.A. Compromised immune competence in free-living tree swallows exposed to mercury. Ecotoxicology 18, 499–503 (2009). https://doi.org/10.1007/s10646-009-0307-4

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  • Received: 09 January 2009

  • Accepted: 11 March 2009

  • Published: 26 March 2009

  • Issue Date: July 2009

  • DOI: https://doi.org/10.1007/s10646-009-0307-4

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