Open-File Report 2015–1020
The wetlands of the Great Salt Lake ecosystem are recognized regionally, nationally, and hemispherically for their importance as breeding, wintering, and migratory habitat for diverse groups of waterbirds. Bear River Migratory Bird Refuge is the largest freshwater component of the Great Salt Lake ecosystem and provides critical breeding habitat for more than 60 bird species. However, the Great Salt Lake ecosystem also has a history of both mercury and selenium contamination, and this pollution could reduce the health and reproductive success of waterbirds. The overall objective of this study was to evaluate the risk of mercury and selenium contamination to birds breeding within Great Salt Lake, especially at Bear River Migratory Bird Refuge, and to identify the waterbird species and areas at greatest risk to contamination. We sampled eggs from 33 species of birds breeding within wetlands of Great Salt Lake during 2010 ̶ 2012 and focused on American avocets (Recurvirostra americana), black-necked stilts (Himantopus mexicanus), Forster’s terns (Sterna forsteri), white-faced ibis (Plegadis chihi), and marsh wrens (Cistothorus palustris) for additional studies of the effects of contaminants on reproduction.
First posted February 2, 2015
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Ackerman, J.T., Herzog, M.P., Hartman, C.A., Isanhart, J., Herring, G., Vaughn, S., Cavitt, J.F., Eagles-Smith, C.A., Browers, H., Cline, C., and Vest, J., 2015, Mercury and selenium contamination in waterbird eggs and risk to avian reproduction at Great Salt Lake, Utah: U.S. Geological Survey Open-File Report 2015-1020, 164 p., https://dx.doi.org/10.3133/ofr20151020.
ISSN 2331-1258 (online)
Results and Discussion
Conclusions and Management Implications
Appendix A. Maps showing total mercury concentrations (THg; μg/g fww) in eggs of 33 species of birds breeding in Great Salt Lake, Utah, 2010 ̶ 2012
Appendix B. Hot spot maps showing total mercury concentrations (THg; μg/g fww) in eggs of 11 species of birds breeding in Great Salt Lake, Utah, 2010 ̶ 2012
Appendix C. Maps showing selenium concentrations (Se; μg/g fww) in eggs of 32 species of birds breeding in Great Salt Lake, Utah, 2010 ̶ 2011