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 (31) , Núria Cid (26) , Michael Danger (32) , Bianca de Freitas Terra (33) , Anna Maria De Girolamo (34, 35) , Ruben del Campo (1, 36) , Fiona Dyer (37) , Arturo Elosegi (7) , Emile Faye (38) , Catherine Febria (39, 40) , Ricardo Figueroa (18) , Brian Four (41) , Mark O Gessner (1, 42) , Pierre Gnohossou (43) , Rosa Gómez Cerezo (36) , Lluís Gomez-Gener (44) , Manuel a S Graça (45) , Simone Guareschi (36) , Björn Gücker (23) , Jason L Hwan (19) , Skhumbuzo Kubheka (46) , Simone Daniela Langhans (47, 48) , Catherine Leigh (29, 49) , Chelsea J Little (14, 50) , Stefan Lorenz (51) , Jonathan Marshall (22, 29) , Angus Mcintosh (39) , Clara Mendoza-Lera (31, 52) , Elisabeth Irmgard Meyer (53) , Marko Miliša (54) , Musa C Mlambo (55) , Marcos Moleón (56) , Peter Negus (22) , Dev Niyogi (57) , Athina Papatheodoulou (58) , Isabel Pardo (59) , Petr Paril (60) , Vladimir Pešić (61) , Pablo Rodriguez-Lozano (19) , Robert J Rolls (62) , Maria Mar Sanchez-Montoya (36) , Ana Savić (63) , Alisha Steward (22, 29) , Rachel Stubbington (64) , Amina Taleb (65) , Ross Vander Vorste (19) , Nathan Waltham (66) , Annamaria Zoppini (34, 35) , Christiane Zarfl (67)
1 IGB - Leibniz Institute of Freshwater Ecology and Inland Fisheries
2 Freie Universität Berlin = Free University of Berlin
3 UNITN - Università degli Studi di Trento = University of Trento
4 University of Rostock = Universität Rostock
5 Aarhus University [Aarhus]
6 RiverLy - Fonctionnement des hydrosystèmes
7 UPV / EHU - Universidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne]
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 UB - Universitat de 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 UdeC - Universidad de Concepción = University of Concepción [Chile]
19 UC Berkeley - University of California [Berkeley]
20 Edith Cowan University
21 Universidad de Antioquia = University of Antioquia [Medellín, Colombia]
22 DAF - Queensland Government - Department of Agriculture and Fisheries
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 [Melbourne]
28 University of Applied Sciences and Arts Switzerland
29 Griffith University [Brisbane]
30 University of Navarra
31 IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture
32 LIEC - Laboratoire Interdisciplinaire des Environnements Continentaux
33 Universidade Estadual Vale do Acarau
34 National Council of Research
35 Water Research Institute
36 Universidad de Murcia = University of Murcia
37 University of Canberra
38 Cirad - Centre de Coopération Internationale en Recherche Agronomique pour le Développement
39 University of Canterbury [Christchurch]
40 University of Windsor [Ca]
41 DEPT EFPA - Département Ecologie des Forêts, Prairies et milieux Aquatiques
42 Berlin Institute of Technology
43 UP - Université de Parakou = University of Parakou
44 Department of Ecology and Environmental Science [Umeå]
45 UC - Universidade de Coimbra = University of Coimbra [Portugal]
46 Ezemvelo KZN Wildlife
47 University of Otago [Dunedin, Nouvelle-Zélande]
48 BC3 - Basque Centre for Climate Change
49 QUT - Queensland University of Technology [Brisbane]
50 EAWAG - Swiss Federal Institute of Aquatic Science and Technology [Dübendorf]
51 JKI - Julius Kühn-Institut
52 BTU - Brandenburgische Technische Universität = Brandenburg Technical University
53 WWU - Westfälische Wilhelms-Universität Münster = University of Münster = Université de Münster [Münster, Allemagne]
54 University of Zagreb
55 Rhodes University [Grahamstown]
56 UGR - Universidad de Granada = University of Granada
57 Missouri S&T - Missouri University of Science and Technology
58 Terra Cypria - Cyprus Conservation Foundation
59 Universidade de Vigo
60 MU / MUNI - Masaryk University [Brno] = Masarykova univerzita [Brno] = Université Masaryk [Brno]
61 UCG - University of Montenegro
62 UNE - University of New England
63 University of Niš
64 Nottingham Trent University
65 Université Aboubekr Belkaid de Tlemcen = University of Belkaïd Abou Bekr [Tlemcen]
66 JCU - James Cook University
67 Eberhard Karls Universität Tübingen = University of Tübingen
T. Datry
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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hal-02181061 , version 1 (16-05-2020)

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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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