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  • 1. Shumilova, Oleksandra
    et al.
    Zak, Dominik
    Datry, Thibault
    von Schiller, Daniel
    Corti, Roland
    Foulquier, Arnaud
    Obrador, Biel
    Tockner, Klement
    Allan, Daniel C.
    Altermatt, Florian
    Isabel Arce, Maria
    Arnon, Shai
    Banas, Damien
    Banegas-Medina, Andy
    Beller, Erin
    Blanchette, Melanie L.
    Blanco-Libreros, Juan F.
    Blessing, Joanna
    Boechat, Iola Goncalves
    Boersma, Kate
    Bogan, Michael T.
    Bonada, Nuria
    Bond, Nick R.
    Brintrup, Kate
    Bruder, Andreas
    Burrows, Ryan
    Cancellario, Tommaso
    Carlson, Stephanie M.
    Cauvy-Fraunie, Sophie
    Cid, Nuria
    Danger, Michael
    de Freitas Terra, Bianca
    De Girolamo, Anna Maria
    del Campo, Ruben
    Dyer, Fiona
    Elosegi, Arturo
    Faye, Emile
    Febria, Catherine
    Figueroa, Ricardo
    Four, Brian
    Gessner, Mark O.
    Gnohossou, Pierre
    Cerezo, Rosa Gomez
    Gómez-Gener, Lluís
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Graca, Manuel A. S.
    Guareschi, Simone
    Guecker, Bjoern
    Hwan, Jason L.
    Kubheka, Skhumbuzo
    Langhans, Simone Daniela
    Leigh, Catherine
    Little, Chelsea J.
    Lorenz, Stefan
    Marshall, Jonathan
    McIntosh, Angus
    Mendoza-Lera, Clara
    Meyer, Elisabeth Irmgard
    Milisa, Marko
    Mlambo, Musa C.
    Moleon, Marcos
    Negus, Peter
    Niyogi, Dev
    Papatheodoulou, Athina
    Pardo, Isabel
    Paril, Petr
    Pesic, Vladimir
    Rodriguez-Lozano, Pablo
    Rolls, Robert J.
    Sanchez-Montoya, Maria Mar
    Savic, Ana
    Steward, Alisha
    Stubbington, Rachel
    Taleb, Amina
    Vander Vorste, Ross
    Waltham, Nathan
    Zoppini, Annamaria
    Zarfl, Christiane
    Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter2019In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 25, no 5, p. 1591-1611Article in journal (Refereed)
    Abstract [en]

    Climate change and human pressures are changing the global distribution and the extent of intermittent rivers and ephemeral streams (IRES), which comprise half of the global river network area. IRES are characterized by periods of flow cessation, during which channel substrates accumulate and undergo physico-chemical changes (preconditioning), and periods of flow resumption, when these substrates are rewetted and release pulses of dissolved nutrients and organic matter (OM). However, there are no estimates of the amounts and quality of leached substances, nor is there information on the underlying environmental constraints operating at the global scale. We experimentally simulated, under standard laboratory conditions, rewetting of leaves, riverbed sediments, and epilithic biofilms collected during the dry phase across 205 IRES from five major climate zones. We determined the amounts and qualitative characteristics of the leached nutrients and OM, and estimated their areal fluxes from riverbeds. In addition, we evaluated the variance in leachate characteristics in relation to selected environmental variables and substrate characteristics. We found that sediments, due to their large quantities within riverbeds, contribute most to the overall flux of dissolved substances during rewetting events (56%-98%), and that flux rates distinctly differ among climate zones. Dissolved organic carbon, phenolics, and nitrate contributed most to the areal fluxes. The largest amounts of leached substances were found in the continental climate zone, coinciding with the lowest potential bioavailability of the leached OM. The opposite pattern was found in the arid zone. Environmental variables expected to be modified under climate change (i.e. potential evapotranspiration, aridity, dry period duration, land use) were correlated with the amount of leached substances, with the strongest relationship found for sediments. These results show that the role of IRES should be accounted for in global biogeochemical cycles, especially because prevalence of IRES will increase due to increasing severity of drying events.

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