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Terrestrial diet influences mercury bioaccumulation in zooplankton and macroinvertebrates in lakes with differing dissolved organic carbon concentrations
Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.ORCID iD: 0000-0002-2037-9164
Interuniv Ctr Aquat Ecosyst Res, WasserCluster Biol Stn Lunz, Lunz Am See, Austria.
Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden;Stat Sweden, Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab. Spanish Natl Res Council, Madrid, Spain.ORCID iD: 0000-0001-6673-1568
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2019 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 669, p. 821-832Article in journal (Refereed) Published
Abstract [en]

Dietary uptake is a key step in conveying both toxic mercury (Hg; particularly as highly bioavailable methylmercury, MeHg) and essential dietary biochemicals, such as polyunsaturated fatty acids (PUFA), across trophic levels within aquatic food webs. Using stable isotopes and fatty acids we evaluated the role of food sources in size-fractioned plankton and littoral macroinvertebrates for the bioaccumulation of total Hg and MeHg in six oligotrophic and one mesotrophic Swedish lakes with differing concentrations of dissolved organic carbon (DOC). We found that the consumption of both algal and terrestrial diets (assessed by PUFA and long-chain saturated fatty acids, respectively) predicted >66% of the Hg concentration variability in meso- (100-500 mu m) and macrozooplankton (>500 mu m) in oligotrophic lakes. In the mesotrophic lake, total Hg bioaccumulation in higher trophic level biota, carnivorous macroinvertebrates was also significantly related to terrestrial diet sources (R-2 = 0.65, p < 0.01). However, lake pH and DOC correlated to total Hg bioaccumulation and bioconcentration across all lakes, suggesting the consumption of different diet sources is mediated by the influence of lake characteristics. This field study reveals that using dietary biomarkers (stable isotopes and fatty acids) together with the physico-chemical lake parameters pH and nutrients together improve our ability to predict Hg bioaccumulation in aquatic food webs. Fatty acids used as dietary biomarkers provide correlative evidence of specific diet source retention in consumers and their effect on Hg bioaccumulation, while pH and nutrients are the underlying physico-chemical lake parameters controlling differences in Hg bioaccumulation between lakes.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 669, p. 821-832
Keywords [en]
Mercury bioaccumulation, Dissolved organic carbon, Fatty acids, Stable isotopes, Plankton, Macroinvertebrates
National Category
Environmental Sciences Ecology
Identifiers
URN: urn:nbn:se:uu:diva-382545DOI: 10.1016/j.scitotenv.2019.03.171ISI: 000463663500079PubMedID: 30897439OAI: oai:DiVA.org:uu-382545DiVA, id: diva2:1314991
Funder
Swedish Research Council, 2013-6978Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2019-05-10Bibliographically approved

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Bravo, Andrea Garcia

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