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Title: Simulating rewetting events in intermittent rivers and ephemeral streams: global analysis of leached nutrients and organic matter
Author: Shumilova, Oleksandra
Zak, Dominik
Datry, Thibault
von Schiller, Daniel
Corti, Roland
Foulquier, Arnaud
Obrador Sala, Biel
Tockner, Klement
Altermatt, Florian
Arce, María Isabel
Arnon, Shai
Banas, Damien
Banegas Medina, Andiranel
Beller, Erin
Blanchette, Melanie L.
Blanco-Libreros, Juan F.
Blessing, Joanna
Gonçalves Boëchat, Iola
Boersma, Kate
Bogan, Michael T.
Bonada i Caparrós, Núria
Bond, Nick R.
Brintrup, Kate
Bruder, Andreas
Burrows, Ryan
Cancellario, Tommaso
Carlson, Stephanie M.
Cauvy-Fraunié, Sophie
Cid Puey, Núria
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
Gómez Cerezo, Rosa
Hwan, Jason L.
Kubheka, Skhumbuzo
Langhans, Simone Daniela
Leigh, Catherine
Little, Chelsea J.
Lorenz, Stefan
Marshal, Jonathan
McIntosh, Angus
Mendoza‐Lera, Clara
Irmgard Meyer, Elisabeth
Miliša, Marko
Mlambo, Musa C.
Moleón, Marcos
Negus, Peter
Niyog, Dev
Papatheodoulou, Athina
Pardo, Isabel
Petr Paril
Pešić, Vladimir
Rodriguez‐Lozano, Pablo
Rolls, Robert J.
Sanchez‐Montoya, Maria M.
Savić, Ana
Steward, Alisha
Stubbington, Rachel
Taleb, Amina
Vander Vorste, Ross
Waltham, Nathan
Zoppini, Annamaria
Zarfl, Christiane
Keywords: Canvi climàtic
Sediments fluvials
Climatic change
River sediments
Issue Date: 9-Jan-2019
Publisher: John Wiley & Sons
Abstract: Climate change and human pressures are changing the global distribution and 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 organic matter. 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.
Note: Reproducció del document publicat a:
It is part of: Global Change Biology, 2019, vol. 25, num. 5, p. 1591-1611
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ISSN: 1354-1013
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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