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Reconstructing avian mercury concentrations through time using museum specimens from New York State

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Abstract

We examined how variation in MeHg concentrations through time is reflected in birds, a taxon commonly used as a biological indicator of ecosystem health. Using museum specimens collected from 1880 to 2016, we measured feather MeHg concentrations in six species of birds that breed in New York State and have distinct dietary and habitat preferences. We predicted that MeHg concentrations in feathers would mirror Hg emission patterns in New York State and increase through time until 1980 then decrease thereafter in response to increased regulation of anthropogenic Hg emissions. We found that MeHg concentrations increased with δ15N, and that MeHg feather concentrations for some individuals from four of the six species examined exceeded concentrations known to cause negative sublethal effects in birds. In contrast to our prediction, MeHg concentrations in feathers did not parallel global or local Hg emissions through time and varied by species, even after controlling for possible changes in diet and habitat. MeHg concentrations varied substantially within species and individual specimens, suggesting that high within-individual variation in feather MeHg concentrations caused by spatiotemporal variation in molt, environmental Hg exposure, or mobility decoupling Hg uptake from breeding sites, may obscure trends in MeHg through time. Our study provides a unique assessment of feather MeHg in six species not typically analyzed using this retrospective approach.

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Acknowledgements

A special thanks to Dr. David Bonter and his lab group, as well as Dr. Alex Flecker, Kimberlee L. Sparks, and Dr. Irby Lovette for their help and encouragement. Comments from three anonymous reviewers helped clarify and refine earlier versions of this paper. Paul Sweet at the American Museum of Natural History and Dr. Jeremy Kirchman at the New York State Museum very kindly provided access to specimens for this work. Statistical assistance from the Cornell Statistical Consulting Unit (CSCU) and Sarah “T” Toner was greatly appreciated. We would also like to thank Mark Burton at the Biodiversity Research Institute for updating the map figure. Additional recognition is due to Cornell University, the Finger Lakes Institute at Hobart and William Smith Colleges, the Cornell Lab of Ornithology, the National Science Foundation, and the Cornell Redheads Fund for financial support and resources. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE1534175. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

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Correspondence to Sarah A. Dzielski.

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Dzielski, S.A., Razavi, N.R., Twining, C.W. et al. Reconstructing avian mercury concentrations through time using museum specimens from New York State. Ecotoxicology 29, 1802–1814 (2020). https://doi.org/10.1007/s10646-019-02123-0

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  • DOI: https://doi.org/10.1007/s10646-019-02123-0

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