The interplay between total mercury, methylmercury and dissolved organic matter in fluvial systems: A latitudinal study across Europe

The interplay between total mercury, methylmercury and dissolved organic matter in fluvial systems: A latitudinal study across Europe. Bravo, A. G., Kothawala, D. N., Attermeyer, K., Tessier, E., Bodmer, P., Ledesma, J. L. J., Audet, J., Casas-Ruiz, J. P., Catalán, N., Cauvy-Fraunié, S., Colls, M., Deininger, A., Evtimova, V. V., Fonvielle, J. A., Fuß, T., Gilbert, P., Herrero Ortega, S., Liu, L., Mendoza-Lera, C., Monteiro, J., Mor, J., Nagler, M., Niedrist, G. H., Nydahl, A. C., Pastor, A., Pegg, J., Gutmann Roberts, C., Pilotto, F., Portela, A. P., González-Quijano, C. R., Romero, F., Rulík, M., & Amouroux, D. Water Research, 144:172–182, November, 2018.

Paper doi abstract bibtex

Large-scale studies are needed to identify the drivers of total mercury (THg) and monomethyl-mercury (MeHg) concentrations in aquatic ecosystems. Studies attempting to link dissolved organic matter (DOM) to levels of THg or MeHg are few and geographically constrained. Additionally, stream and river systems have been understudied as compared to lakes. Hence, the aim of this study was to examine the influence of DOM concentration and composition, morphological descriptors, land uses and water chemistry on THg and MeHg concentrations and the percentage of THg as MeHg (%MeHg) in 29 streams across Europe spanning from 41°N to 64 °N. THg concentrations (0.06–2.78 ng L−1) were highest in streams characterized by DOM with a high terrestrial soil signature and low nutrient content. MeHg concentrations (7.8–159 pg L−1) varied non-systematically across systems. Relationships between DOM bulk characteristics and THg and MeHg suggest that while soil derived DOM inputs control THg concentrations, autochthonous DOM (aquatically produced) and the availability of electron acceptors for Hg methylating microorganisms (e.g. sulfate) drive %MeHg and potentially MeHg concentration. Overall, these results highlight the large spatial variability in THg and MeHg concentrations at the European scale, and underscore the importance of DOM composition on mercury cycling in fluvial systems.

@article{bravo_interplay_2018,
	title = {The interplay between total mercury, methylmercury and dissolved organic matter in fluvial systems: {A} latitudinal study across {Europe}},
	volume = {144},
	issn = {0043-1354},
	shorttitle = {The interplay between total mercury, methylmercury and dissolved organic matter in fluvial systems},
	url = {https://www.sciencedirect.com/science/article/pii/S0043135418305244},
	doi = {10.1016/j.watres.2018.06.064},
	abstract = {Large-scale studies are needed to identify the drivers of total mercury (THg) and monomethyl-mercury (MeHg) concentrations in aquatic ecosystems. Studies attempting to link dissolved organic matter (DOM) to levels of THg or MeHg are few and geographically constrained. Additionally, stream and river systems have been understudied as compared to lakes. Hence, the aim of this study was to examine the influence of DOM concentration and composition, morphological descriptors, land uses and water chemistry on THg and MeHg concentrations and the percentage of THg as MeHg (\%MeHg) in 29 streams across Europe spanning from 41°N to 64 °N. THg concentrations (0.06–2.78 ng L−1) were highest in streams characterized by DOM with a high terrestrial soil signature and low nutrient content. MeHg concentrations (7.8–159 pg L−1) varied non-systematically across systems. Relationships between DOM bulk characteristics and THg and MeHg suggest that while soil derived DOM inputs control THg concentrations, autochthonous DOM (aquatically produced) and the availability of electron acceptors for Hg methylating microorganisms (e.g. sulfate) drive \%MeHg and potentially MeHg concentration. Overall, these results highlight the large spatial variability in THg and MeHg concentrations at the European scale, and underscore the importance of DOM composition on mercury cycling in fluvial systems.},
	urldate = {2024-03-26},
	journal = {Water Research},
	author = {Bravo, Andrea G. and Kothawala, Dolly N. and Attermeyer, Katrin and Tessier, Emmanuel and Bodmer, Pascal and Ledesma, José L. J. and Audet, Joachim and Casas-Ruiz, Joan Pere and Catalán, Núria and Cauvy-Fraunié, Sophie and Colls, Miriam and Deininger, Anne and Evtimova, Vesela V. and Fonvielle, Jérémy A. and Fuß, Thomas and Gilbert, Peter and Herrero Ortega, Sonia and Liu, Liu and Mendoza-Lera, Clara and Monteiro, Juliana and Mor, Jordi-René and Nagler, Magdalena and Niedrist, Georg H. and Nydahl, Anna C. and Pastor, Ada and Pegg, Josephine and Gutmann Roberts, Catherine and Pilotto, Francesca and Portela, Ana Paula and González-Quijano, Clara Romero and Romero, Ferran and Rulík, Martin and Amouroux, David},
	month = nov,
	year = {2018},
	keywords = {\#nosource, Fluorescence, Mercury, Methylmercury, Organic matter, Rivers, Streams},
	pages = {172--182},
}

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