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Research article2020Peer reviewedOpen access

Drought alters the biogeochemistry of boreal stream networks

Gomez-Gener, Lluis; Lupon, Anna; Laudon, Hjalmar; Sponseller, Ryan A.

Abstract

Drought is a global phenomenon, with widespread implications for freshwater ecosystems. While droughts receive much attention at lower latitudes, their effects on northern river networks remain unstudied. We combine a reach-scale manipulation experiment, observations during the extreme 2018 drought, and historical monitoring data to examine the impact of drought in northern boreal streams. Increased water residence time during drought promoted reductions in aerobic metabolism and increased concentrations of reduced solutes in both stream and hyporheic water. Likewise, data during the 2018 drought revealed widespread hypoxic conditions and shifts towards anaerobic metabolism, especially in headwaters. Finally, long-term data confirmed that past summer droughts have led to similar metabolic alterations. Our results highlight the potential for drought to promote biogeochemical shifts that trigger poor water quality conditions in boreal streams. Given projected increases in hydrological extremes at northern latitudes, the consequences of drought for the health of running waters warrant attention. High latitude droughts are increasing, but their effects on freshwater systems are poorly understood. Here the authors investigate Sweden's most severe drought in the last century and show that these dry conditions induce hypoxia and elevated methane production from streams.

Published in

Nature Communications
2020, Volume: 11, number: 1
Publisher: NATURE PUBLISHING GROUP

    Sustainable Development Goals

    Ensure availability and sustainable management of water and sanitation for all

    UKÄ Subject classification

    Oceanography, Hydrology, Water Resources

    Publication identifier

    DOI: https://doi.org/10.1038/s41467-020-15496-2

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/105597