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Emergent Freshwater Insects Serve as Subsidies of Methylmercury and Beneficial Fatty Acids for Riparian Predators Across an Agricultural Gradient

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2021

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Twining, Cornelia W.
Razavi, N. Roxanna
Brenna, J. Thomas
Dzielski, Sarah A.
Gonzalez, Sara T.
Lawrence, Peter
Cleckner, Lisa B.
Flecker, Alexander S.

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Environmental Science & Technology. American Chemical Society (ACS). 2021, 55(9), pp. 5868-5877. ISSN 0013-936X. eISSN 1520-5851. Available under: doi: 10.1021/acs.est.0c07683

Zusammenfassung

Aquatic-to-terrestrial subsidies have the potential to provide riparian consumers with benefits in terms of physiologically important organic compounds like omega-3 long-chain polyunsaturated fatty acids (n-3 LCPUFAs). However, they also have a “dark side” in the form of exposure to toxicants such as mercury. Human land use intensity may also determine whether subsidies provide benefits or come at a cost for riparian predators. We sampled insects as well as Eastern Phoebe (Sayornis phoebe) chicks in 2015–2016 within the southern Finger Lakes region to understand how food quality, in terms of n-3 LCPUFAs and methylmercury (MeHg), of emergent freshwater insects compared with that of terrestrial insects and how land use affected the quality of prey, predator diet composition, and MeHg exposure. Across the landscape, freshwater insects had a significantly higher percentage of the n-3 LCPUFA eicosapentaenoic acid (EPA) compared to terrestrial insects and contained significantly more MeHg than terrestrial insects did. In spite of differences in MeHg concentrations between aquatic and terrestrial insects, chick MeHg concentrations were not related to diet composition. Instead, chick MeHg concentrations increased with several metrics of human land use intensity, including percent agriculture. Our findings suggest that freshwater subsidies provide predators with both risks and benefits, but that predator MeHg exposure can vary with human land use intensity.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie

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omega-3 long-chain polyunsaturated fatty acids, methylmercury, emergent freshwater insects, agriculture

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ISO 690TWINING, Cornelia W., N. Roxanna RAZAVI, J. Thomas BRENNA, Sarah A. DZIELSKI, Sara T. GONZALEZ, Peter LAWRENCE, Lisa B. CLECKNER, Alexander S. FLECKER, 2021. Emergent Freshwater Insects Serve as Subsidies of Methylmercury and Beneficial Fatty Acids for Riparian Predators Across an Agricultural Gradient. In: Environmental Science & Technology. American Chemical Society (ACS). 2021, 55(9), pp. 5868-5877. ISSN 0013-936X. eISSN 1520-5851. Available under: doi: 10.1021/acs.est.0c07683
BibTex
@article{Twining2021Emerg-54228,
  year={2021},
  doi={10.1021/acs.est.0c07683},
  title={Emergent Freshwater Insects Serve as Subsidies of Methylmercury and Beneficial Fatty Acids for Riparian Predators Across an Agricultural Gradient},
  number={9},
  volume={55},
  issn={0013-936X},
  journal={Environmental Science & Technology},
  pages={5868--5877},
  author={Twining, Cornelia W. and Razavi, N. Roxanna and Brenna, J. Thomas and Dzielski, Sarah A. and Gonzalez, Sara T. and Lawrence, Peter and Cleckner, Lisa B. and Flecker, Alexander S.}
}
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