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Article Dans Une Revue Global Change Biology Année : 2019

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

Oleksandra Shumilova (1, 2, 3) , Dominik Zak (2, 4, 5) , T. Datry (6) , Daniel von Schiller (7) , Roland Corti (6) , Arnaud Foulquier (8, 9, 10) , Biel Obrador (11) , Klement Tockner (1, 2, 12) , Daniel C Allan (13) , Florian Altermatt (14) , María Isabel Arce (1, 15) , Shai Arnon (16) , Damien Banas (17) , Andy Banegas-Medina (18) , Erin Beller (19) , Melanie L Blanchette (20) , Juan F Blanco-Libreros (21) , Joanna Blessing (22) , Iola Gonçalves Boëchat (23) , Kate Boersma (24) , Michael T Bogan (25) , Núria Bonada (26) , Nick R Bond (27) , Kate Brintrup (18) , Andreas Bruder (28) , Ryan Burrows (29) , Tommaso Cancellario (30) , Stephanie M Carlson (19) , Sophie Cauvy-Fraunié (6) , Núria Cid (26) , Michael Danger (31) , Bianca de Freitas Terra (32) , Anna Maria De Girolamo (33, 34) , Ruben del Campo (1, 35) , Fiona Dyer (36) , Arturo Elosegi (7) , Emile Faye (37) , Catherine Febria (38, 39) , Ricardo Figueroa (18) , Brian Four (40) , Mark O Gessner (1, 41) , Pierre Gnohossou (42) , Rosa Gómez Cerezo (35) , Lluís Gomez-Gener (43) , Manuel a S Graça (44) , Simone Guareschi (35) , Björn Gücker (23) , Jason L Hwan (19) , Skhumbuzo Kubheka (45) , Simone Daniela Langhans (46, 47) , Catherine Leigh (29, 48) , Chelsea J Little (14, 49) , Stefan Lorenz (50) , Jonathan Marshall (22, 29) , Angus Mcintosh (38) , Clara Mendoza-Lera (6, 51) , Elisabeth Irmgard Meyer (52) , Marko Miliša (53) , Musa C Mlambo (54) , Marcos Moleón (55) , Peter Negus (22) , Dev Niyogi (56) , Athina Papatheodoulou (57) , Isabel Pardo (58) , Petr Paril (59) , Vladimir Pešić (60) , Pablo Rodriguez-Lozano (19) , Robert J Rolls (61) , Maria Mar Sanchez-Montoya (35) , Ana Savić (62) , Alisha Steward (22, 29) , Rachel Stubbington (63) , Amina Taleb (64) , Ross Vander Vorste (19) , Nathan Waltham (65) , Annamaria Zoppini (33, 34) , Christiane Zarfl (66)
1 Leibniz-Institute of Freshwater Ecology and Inland Fisheries
2 Freie Universität Berlin
3 UNITN - Università degli Studi di Trento = University of Trento
4 Universität Rostock
5 Aarhus University [Aarhus]
6 IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture
7 UPV / EHU - University of the Basque Country = Euskal Herriko Unibertsitatea
8 LECA - Laboratoire d'Ecologie Alpine
9 CNRS - Centre National de la Recherche Scientifique
10 USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc
11 University of Barcelona
12 FWF - Austrian Science Fund
13 OU - University of Oklahoma
14 UZH - Universität Zürich [Zürich] = University of Zurich
15 Centro de Edafologia y Biologia Aplicada del Segura
16 BGU - Ben-Gurion University of the Negev
17 URAFPA - Unité de Recherches Animal et Fonctionnalités des Produits Animaux
18 Universidad de Concepción - University of Concepcion [Chile]
19 UC Berkeley - University of California [Berkeley]
20 Edith Cowan University
21 University of Antioquia
22 Queensland Government
23 UFSJ - Universidade Federal de São João del-Rei
24 UC San Diego - University of California [San Diego]
25 University of Arizona
26 UAB - Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona
27 La Trobe University
28 University of Applied Sciences and Arts Switzerland
29 Griffith University [Brisbane]
30 University of Navarra
31 LIEC - Laboratoire Interdisciplinaire des Environnements Continentaux
32 Universidade Estadual Vale do Acarau
33 National Council of Research
34 Water Research Institute
35 Universidad de Murcia
36 University of Canberra
37 Cirad - Centre de Coopération Internationale en Recherche Agronomique pour le Développement
38 University of Canterbury [Christchurch]
39 University of Windsor [Ca]
40 DEPT EFPA - Département Ecologie des Forêts, Prairies et milieux Aquatiques
41 Berlin Institute of Technology
42 UP - Université de Parakou = University of Parakou
43 Department of Ecology and Environmental Science [Umeå]
44 University of Coimbra
45 Ezemvelo KZN Wildlife
46 University of Otago [Dunedin, Nouvelle-Zélande]
47 BC3 - Basque Centre for Climate Change
48 QUT - Queensland University of Technology [Brisbane]
49 EAWAG - Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf]
50 JKI - Julius Kühn-Institut
51 BTU - Brandenburgische Technische Universität = Brandenburg Technical University
52 WWU - Westfälische Wilhelms-Universität Münster = University of Münster
53 University of Zagreb
54 Rhodes University, Grahamstown
55 UGR - Universidad de Granada = University of Granada
56 Missouri S&T - Missouri University of Science and Technology
57 Terra Cypria - Cyprus Conservation Foundation
58 Universidade de Vigo
59 MUNI - Masaryk University [Brno]
60 UCG - University of Montenegro
61 UNE - University of New England
62 University of Niš
63 Nottingham Trent University
64 Université de Tlemcen
65 JCU - James Cook University
66 University of Tübingen
Nick R Bond
  • Fonction : Auteur
Isabel Pardo
Ana Savić
  • Fonction : Auteur
Rachel Stubbington

Résumé

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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Dates et versions

hal-02181061 , version 1 (16-05-2020)

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Citer

Oleksandra Shumilova, Dominik Zak, T. Datry, Daniel von Schiller, Roland Corti, et al.. Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter. Global Change Biology, 2019, 25 (5), pp.1591-1611. ⟨10.1111/gcb.14537⟩. ⟨hal-02181061⟩
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