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Ecotoxicology

, Volume 27, Issue 1, pp 45–54 | Cite as

Mercury concentrations in bats (Chiroptera) from a gold mining area in the Peruvian Amazon

  • Mónica Moreno-BrushEmail author
  • Alejandro PortilloEmail author
  • Stefan Dominik Brändel
  • Ilse Storch
  • Marco Tschapka
  • Harald Biester
Article

Abstract

In the southeastern Peruvian Amazon, artisanal and small-scale gold mining (ASGM) is estimated to have released up to 300 tonnes of mercury (Hg) to the environment between 1995 and 2007 alone, and is claimed to be responsible for Hg concentrations above international thresholds for aquatic wildlife species. Here, we examined whether Hg concentrations in bat populations are potentially related to regional ASGM-Hg releases. We determined Hg concentrations in the fur of bats collected at three different distances from the major ASGM areas in Peru. Our findings from 204 individuals of 32 species indicate that Hg concentrations in bat fur mainly resulted from differences in feeding habits, because Hg concentrations were significantly higher in omnivorous bats than in frugivorous bats. At least in two species, populations living in ASGM-affected sites harbored higher Hg concentrations than did populations in unaffected sites. Because Hg concentrations reflect Hg dietary exposure, Hg emissions from amalgam roasting sites appear to deposit locally and enter the terrestrial food web. Although our study demonstrates that ASGM activities (and Hg point sources) increase Hg exposure in wildlife, the overall Hg concentrations reported here are relatively low. The measured Hg concentrations were below the toxicity threshold at which adverse neurological effects have been reported in rodents and mink (>10 µg g−1), and were in the range of Hg concentrations in the fur of bats from nonpoint source affected sites in other latitudes. This study emphasizes the importance of considering feeding habits when evaluating Hg concentrations in bats and other vertebrates.

Keywords

Mercury Hg Gold mining Bats Amazon rainforest wildlife 

Notes

Acknowledgements

This research was partially funded by Tambopata Reserve Society (TReeS), World Wildlife Foundation (WWF-Peru), and AG Umweltgeochemie—TU Braunschweig. We are greatful for the logistic support of Servicio Nacional de Areas Protegidas por el Estado (Sernanp), Servicio Nacional Forestal y de Fauna Silvestre (Serfor), Asociación para la Investigación y Desarrollo Integral (Aider), as well as of Jose Luis Mena and Nadesna Cortes. Thanks to Katherin Bernabé, Emilio Bonifaz, Deyber Gil, Werner Pinedo, and Fredy Mollehuanca for their assistance in the field. We appreciate the guidance on the data treatment and the constructive comments of Dagmar Söndgerath, Johan Rydberg, Dania Richter, and Marta Pérez-Rodríguez that greatly helped to improve the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing financial interests.

Ethical approval

This article does not contain any studies with human participants. Capture and handling of bats were conducted under the research permit (N° 006-2015-SERNANP-JEF) obtained from the Peruvian authorities of the national protected areas (Sernanp).

Supplementary material

10646_2017_1869_MOESM1_ESM.docx (386 kb)
Supplementary Information

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Chair of Wildlife Ecology and Management, University of FreiburgFreiburgGermany
  2. 2.Institut für Geoökologie, Abt. Umweltgeochemie, Technische Universität BraunschweigBraunschweigGermany
  3. 3.Museo de Historia Natural, Universidad Nacional San Antonio Abad del Cusco, Plaza de armas S/N (Paraninfo Universitario)CuscoPeru
  4. 4.Institute of Evolutionary Ecology and Conservation Genomics, University of UlmUlmGermany
  5. 5.Smithsonian Tropical Research InstitutePanamaPanama

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