Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter

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  • Oleksandra Shumilova, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, School of Business and Economics, University of Trento
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  • Dominik Zak
  • Thibault Datry, IRSTEA – National Research Institute of Science and Technology for Environment and Agriculture
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  • Daniel von Schiller, University of the Basque Country UPV/EHU
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  • Roland Corti, IRSTEA – National Research Institute of Science and Technology for Environment and Agriculture
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  • Arnaud Foulquier, Univ. Grenoble Alpes
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  • Biel Obrador, Universitat Pompeu Fabra, Barcelona
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  • Klement Tockner, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, School of Business and Economics, Austrian Science Fund (FWF)
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  • Daniel C. Allan, University of Oklahoma in Norman, Oklahoma, USA
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  • Florian Altermatt, Physik-Institut, Universitat Zürich-Irchel
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  • María Isabel Arce, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Center for Edafology and Apply Biology of Segura (CEBAS-CSIC)
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  • Shai Arnon, Ben-Gurion University of the Negev
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  • Damien Banas, Université de Lorraine
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  • Andy Banegas-Medina, Universidad de Concepción
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  • Erin Beller, UC Berkeley
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  • Melanie L. Blanchette, Edith Cowan University, Joondalup
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  • Juan F. Blanco-Libreros, Universidad de Antioquia
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  • Joanna Blessing, Queensland Government
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  • Iola Gonçalves Boëchat, Universidade Federal de São Jõao Del-Rei
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  • Kate Boersma, University of San Diego
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  • Michael T. Bogan, University of Arizona
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  • Núria Bonada, Universitat Pompeu Fabra, Barcelona
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  • Nick R. Bond, La Trobe University
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  • Kate Brintrup, Universidad de Concepción
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  • Andreas Bruder, University of Applied Sciences and Arts of Southern Switzerland
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  • Ryan Burrows, Griffith University
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  • Tommaso Cancellario, Clínica Universidad de Navarra
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  • Stephanie M. Carlson, UC Berkeley
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  • Sophie Cauvy-Fraunié, IRSTEA – National Research Institute of Science and Technology for Environment and Agriculture
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  • Núria Cid, Universitat Pompeu Fabra, Barcelona
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  • Michael Danger, Université de Lorraine
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  • Bianca de Freitas Terra, Universidade Estadual Vale do Acaraú
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  • Anna Maria De Girolamo, Consiglio Nazionale delle Ricerche
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  • Ruben del Campo, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Universidad de Murcia
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  • Fiona Dyer, University of Canberra
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  • Arturo Elosegi, University of the Basque Country UPV/EHU
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  • Emile Faye, CIRAD Centre de Recherche de Montpellier
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  • Catherine Febria, University of Canterbury, University of Windsor
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  • Ricardo Figueroa, Universidad de Concepción
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  • Brian Four, Institut national de la recherche agronomique (INRA)
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  • Mark O. Gessner, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Technical University of Berlin
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  • Pierre Gnohossou, Université de Parakou
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  • Rosa Gómez Cerezo, Universidad de Murcia
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  • Lluís Gomez-Gener, Department of Ecology and Environmental Science, Climate Impacts Research Centre, Clinical Sciences, Umea universitet, Klinisk vetenskap.
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  • Manuel A.S. Graça, University of Coimbra, Marine and Environmental Research Centre
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  • Simone Guareschi, Universidad de Murcia
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  • Björn Gücker, Universidade Federal de São Jõao Del-Rei
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  • Jason L. Hwan, UC Berkeley
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  • Skhumbuzo Kubheka, Ezemvelo KZN Wildlife
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  • Simone Daniela Langhans, University of Otago, BC3 Basque Centre for Climate Change
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  • Catherine Leigh, Griffith University, Queensland University of Technology QUT
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  • Chelsea J. Little, Physik-Institut, Universitat Zürich-Irchel, Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Dübendorf
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  • Stefan Lorenz, Plant Analysis and Stored Product Protection
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  • Jonathan Marshall, Queensland Government, Griffith University
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  • Angus McIntosh, University of Canterbury
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  • Clara Mendoza-Lera, IRSTEA – National Research Institute of Science and Technology for Environment and Agriculture, BTU Cottbus-Senftenberg
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  • Elisabeth Irmgard Meyer, Westfälische Wilhelms-Universität Münster
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  • Marko Miliša, School of Medicine of the University of Zagreb
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  • Musa C. Mlambo, Rhodes University
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  • Marcos Moleón, Universidad de Granada
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  • Peter Negus, Queensland Government
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  • Dev Niyogi, University of Missouri-Rolla
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  • Athina Papatheodoulou, Terra Cypria – The Cyprus Conservation Foundation
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  • Isabel Pardo, Universidad de Vigo
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  • Petr Paril, Masaryk University
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  • Vladimir Pešić, University of Montenegro
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  • Pablo Rodriguez-Lozano, UC Berkeley
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  • Robert J. Rolls, University of New England Australia
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  • Maria Mar Sanchez-Montoya, Universidad de Murcia
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  • Ana Savić, University of Nis
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  • Alisha Steward, Queensland Government, Griffith University
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  • Rachel Stubbington, Nottingham Trent University
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  • Amina Taleb, University of Tlemcen
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  • Ross Vander Vorste, UC Berkeley
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  • Nathan Waltham, James Cook University, Australia
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  • Annamaria Zoppini, Consiglio Nazionale delle Ricerche
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  • Christiane Zarfl, University Tübingen

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.

OriginalsprogEngelsk
TidsskriftGlobal Change Biology
Vol/bind25
Nummer5
Sider (fra-til)1591-1611
Antal sider21
ISSN1354-1013
DOI
StatusUdgivet - 2019

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