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1. Unravelling large-scale patterns and drivers of biodiversity in dry rivers

Author

Arnaud Foulquier, Thibault Datry, Roland Corti, Daniel von Schiller, Klement Tockner, Rachel Stubbington, Mark O. Gessner, Frédéric Boyer, Marc Ohlmann, Wilfried Thuiller, Delphine Rioux, Christian Miquel, Ricardo Albariño, Daniel C. Allen, Florian Altermatt, Maria Isabel Arce, Shai Arnon, Damien Banas, Andy Banegas-Medina, Erin Beller, Melanie L. Blanchette, Joanna Blessing, Iola Gonçalves Boëchat, Kate Boersma, Michael Bogan, Núria Bonada, Nick Bond, Katherine Brintrup, Andreas Bruder, Ryan Burrows, Tommaso Cancellario, Cristina Canhoto, Stephanie Carlson, Núria Cid, Julien Cornut, Michael Danger, Bianca de Freitas Terra, Anna Maria De Girolamo, Rubén del Campo, Verónica Díaz Villanueva, Fiona Dyer, Arturo Elosegi, Catherine Febria, Ricardo Figueroa Jara, Brian Four, Sarig Gafny, Rosa Gómez, Lluís Gómez-Gener, Simone Guareschi, Björn Gücker, Jason Hwan, J. Iwan Jones, Patrick S. Kubheka, Alex Laini, Simone Daniela Langhans, Bertrand Launay, Guillaume Le Goff, Catherine Leigh, Chelsea Little, Stefan Lorenz, Jonathan Marshall, Eduardo J. Martin Sanz, Angus McIntosh, Clara Mendoza-Lera, Elisabeth I. Meyer, Marko Miliša, Musa C. Mlambo, Manuela Morais, Nabor Moya, Peter Negus, Dev Niyogi, Iluminada Pagán, Athina Papatheodoulou, Giuseppe Pappagallo, Isabel Pardo, Petr Pařil, Steffen U. Pauls, Marek Polášek, Pablo Rodríguez-Lozano, Robert J. Rolls, Maria Mar Sánchez-Montoya, Ana Savić, Oleksandra Shumilova, Kandikere R. Sridhar, Alisha Steward, Amina Taleb, Avi Uzan, Yefrin Valladares, Ross Vander Vorste, Nathan J. Waltham, Dominik H. Zak, and Annamaria Zoppini

Subjects
Science
Abstract

Abstract More than half of the world’s rivers dry up periodically, but our understanding of the biological communities in dry riverbeds remains limited. Specifically, the roles of dispersal, environmental filtering and biotic interactions in driving biodiversity in dry rivers are poorly understood. Here, we conduct a large-scale coordinated survey of patterns and drivers of biodiversity in dry riverbeds. We focus on eight major taxa, including microorganisms, invertebrates and plants: Algae, Archaea, Bacteria, Fungi, Protozoa, Arthropods, Nematodes and Streptophyta. We use environmental DNA metabarcoding to assess biodiversity in dry sediments collected over a 1-year period from 84 non-perennial rivers across 19 countries on four continents. Both direct factors, such as nutrient and carbon availability, and indirect factors such as climate influence the local biodiversity of most taxa. Limited resource availability and prolonged dry phases favor oligotrophic microbial taxa. Co-variation among taxa, particularly Bacteria, Fungi, Algae and Protozoa, explain more spatial variation in community composition than dispersal or environmental gradients. This finding suggests that biotic interactions or unmeasured ecological and evolutionary factors may strongly influence communities during dry phases, altering biodiversity responses to global changes.

Published
2024
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2. Sediment Respiration Pulses in Intermittent Rivers and Ephemeral Streams

Author

Robert J. Rolls, Chelsea J. Little, Simone Guareschi, Annamaria Zoppini, R. Vander Vorste, Eduardo J. Martín, Arnaud Foulquier, Núria Cid, Kate S. Boersma, Michael T. Bogan, Björn Gücker, Cleo Woelfle-Erskine, Amina Taleb, V. D. Diaz-Villanueva, Manuela Morais, J. Marshall, Arturo Elosegi, Vladimir Pešić, Lluís Gómez-Gener, S. Kubheka, Marko Miliša, Clara Mendoza-Lera, Florian Altermatt, Rachel Stubbington, Iola G. Boëchat, Ryan M. Burrows, Arnaud Dehedin, Damien Banas, Iñaki Odriozola, Núria Bonada, Roland Corti, Marcos Moleón, R. Gómez, Ricardo J. Albariño, Erin E. Beller, Alex Laini, Pablo Rodríguez-Lozano, Andreas Bruder, Melanie L. Blanchette, Felicitas Hoppeler, Shai Arnon, B. de Freitas Terra, A. Papatheodoulou, Nathan J. Waltham, Christophe Piscart, Rafael Marcé, Catherine M. Febria, A. Uzan, Peter M. Negus, Dev K. Niyogi, Dominik Zak, Sophie Cauvy-Fraunié, Ana Savić, Catherine Leigh, R. Figueroa, Sarig Gafny, Alisha L. Steward, Emile Faye, Elisabeth I. Meyer, Petr Pařil, Daniel C. Allen, Klement Tockner, D. von Schiller, Mark O. Gessner, K. Brintrup, Jason L. Hwan, Fiona Dyer, C. P. Duerdoth, Gonzalo García-Baquero, Michael Danger, Isabel Pardo, Musa C. Mlambo, R. del Campo, Tommaso Cancellario, Brian Four, A. M. De Girolamo, Thibault Datry, Oleksandra Shumilova, María Isabel Arce, M. M. Sánchez-Montoya, Marek Polášek, Nick Bond, Juan F. Blanco-Libreros, Simone D. Langhans, Stephanie M. Carlson, Andy Banegas-Medina, Manuel A. S. Graça, Joanna Blessing, Biel Obrador, Stefan Lorenz, Christiane Zarfl, Angus R. McIntosh, European Commission, Milieux aquatiques, écologie et pollutions (UR MALY), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB), Leibniz Association, Department of Plant Biology and Ecology, University of the Basque Country, Department of Advanced Materials, Cranfield University, Laboratoire d'Ecologie des Hydrosystèmes Fluviaux (EHF), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Purdue University [West Lafayette], Centro de investigaciones biológicas, Spanish National Research Council (CSIC), Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Electronique Quantique, Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB)-Faculté de Physique, 748625, Horizon 2020 Framework Programme, 603629, European Commission, CGL2017‐86788‐C3‐3‐P, Ministerio de Economía y Competitividad, PP00P3_179089, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, IT‐951‐16, Eusko Jaurlaritza, CA15113, European Cooperation in Science and Technology, Universidad del Pais Vasco / Euskal Herriko Unibertsitatea [Espagne] (UPV/EHU), Universitat de Barcelona (UB), RiverLy (UR Riverly), Laboratoire d'Ecologie Alpine (LECA ), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Austrian Science Fund (FWF), Instituto Catalán de Investigación del Agua - ICRA (SPAIN) (ICRA), Laboratory of Molecular Structure Characterization [Prague] (MBU / CAS), Institute of Microbiology of the Czech Academy of Sciences (MBU / CAS), Czech Academy of Sciences [Prague] (CAS)-Czech Academy of Sciences [Prague] (CAS), University of Barcelona, Technische Universität Berlin (TU), Nottingham Trent University, Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente [Bariloche] (INIBIOMA-CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional del Comahue [Neuquén] (UNCOMA), University of Oklahoma (OU), Universität Zürich [Zürich] = University of Zurich (UZH), Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf] (EAWAG), The Jacob Blaustein Institutes for Desert Research (BIDR), Ben-Gurion University of the Negev (BGU), Unité de Recherches Animal et Fonctionnalités des Produits Animaux (URAFPA), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Universidad de Concepción - University of Concepcion [Chile], Department of Geography [Berkeley], University of California [Berkeley], University of California-University of California, Edith Cowan University (ECU), Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO)-Planning and Transport Research Centre (PATREC), Universidad de Antioquia = University of Antioquia [Medellín, Colombia], Queensland Government, Universidade Federal de São João del-Rei (UFSJ), University of San Diego, University of Arizona, La Trobe University, Scuola universitaria professionale della Svizzera italiana [Manno] (SUPSI), Australian Rivers Institute, Griffith University [Brisbane], Universidad de Navarra [Pamplona] (UNAV), Department of Environmental Science, Policy, and Management [Berkeley] (ESPM), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Terre et Environnement de Lorraine (OTELo), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Universidade Estadual Vale do Acarau, Asconit Consultants, National Research Council, Water Research Institute, Universidad de Murcia, Queen Mary University of London (QMUL), University of Canberra, Fonctionnement agroécologique et performances des systèmes de cultures horticoles (UPR HORTSYS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), School of biological Sciences [Christchurch], University of Canterbury [Christchurch], University of Windsor [Ca], Département Ecologie des Forêts, Prairies et milieux Aquatiques (DEPT EFPA), Institut National de la Recherche Agronomique (INRA), Ruppin Academic Center, Department of Ecology and Environmental Science [Umeå], Umeå University, Marine and Environmental Sciences Centre (MARE UC), Universidade de Coimbra [Coimbra], Loughborough University, Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Goethe-Universität Frankfurt am Main-Senckenberg – Leibniz Institution for Biodiversity and Earth System Research - Senckenberg Gesellschaft für Naturforschung, Leibniz Association-Leibniz Association, Ezemvelo KZN Wildlife, University of Parma = Università degli studi di Parma [Parme, Italie], University of Otago [Dunedin, Nouvelle-Zélande], Basque Centre for Climate Change (BC3), Queensland University of Technology [Brisbane] (QUT), Julius Kühn-Institut (JKI), Institute for Evolution and Biodiversity (IEB), Westfälische Wilhelms-Universität Münster (WWU), University of Zagreb, Rhodes University, Grahamstown, Universidad de Granada (UGR), Universidade de Évora, Missouri University of Science and Technology (Missouri S&T), University of Missouri System, Terra Cypria - Cyprus Conservation Foundation, Universidade de Vigo, Masaryk University [Brno] (MUNI), University of Montenegro (UCG), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), School of Environmental and Rural Science, University of New England (UNE), University of Niš, Freie Universität Berlin, University of Trento [Trento], Université Aboubekr Belkaid - University of Belkaïd Abou Bekr [Tlemcen], Israel Nature and Parks Authority, Partenaires INRAE, Centre for TropicalWater and Aquatic Ecosystem Research (TropWATER), School of Earth and Environmental Sciences [Australia], James Cook University (JCU)-James Cook University (JCU), University of Washington [Seattle], Universität Rostock, Aarhus University [Aarhus], Center for Applied Geoscience [Tübingen] (ZAG), Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen, Short-Term Scientific Mission of the COST Action : CA15113, European Cooperation in Science and Technology (COST), European Commission : 603629 , 748625, Grant for Research Groups of the Basque University System - Basque Government : IT-951-16, Spanish Ministry of Science, Innovation and Universities through project CHYDROCHANGE : CGL2017-86788C3-2-P , CGL2017-86788-C3-3-P, Swiss National Science Foundation (SNSF) - European Commission : PP00P3_150698, PP00P3_179089, EU project LIFE+ TRivers : LIFE13 ENV/ES/000341, INTER-COST project : LTC17017, CONICYT/FONDAT/15130015, European Project: 748625,H2020-MSCA-IF-2016,SABER CULTURAL, European Project: 0934954(2009), Institute of Microbiology of the Czech Academy of Sciences [Prague, Czech Republic] (MBU / CAS), Technical University of Berlin / Technische Universität Berlin (TU), Université de Lorraine (UL)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), University of California [Berkeley] (UC Berkeley), University of California (UC)-University of California (UC), University of San Diego (USD), Scuola universitaria professionale della Svizzera italiana = University of Applied Sciences and Arts of Southern Switzerland [Manno] (SUPSI), Università degli studi di Parma = University of Parma (UNIPR), Westfälische Wilhelms-Universität Münster = University of Münster (WWU), Universidad de Granada = University of Granada (UGR), Université de Rennes (UR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), and Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Carbon sequestration, 0106 biological sciences, Atmospheric Science, 010504 meteorology & atmospheric sciences, [SDE.MCG]Environmental Sciences/Global Changes, river, CO, 2, intermittent, respiration, stream, temporary, STREAMS, Atmospheric sciences, 01 natural sciences, River sediments, chemistry.chemical_compound, Rivers, Respiration, Environmental Chemistry, Ecosystem, Captura i emmagatzematge de diòxid de carboni, ComputingMilieux_MISCELLANEOUS, Cursos d'aigua, 0105 earth and related environmental sciences, General Environmental Science, Riparian zone, Global and Planetary Change, geography, geography.geographical_feature_category, 010604 marine biology & hydrobiology, Sediments fluvials, fungi, River, Stream, Intermittent, Temporary, CO2, CO2 emissions, C cycling, stream respiration, Sediment, Vegetation, 15. Life on land, 6. Clean water, chemistry, 13. Climate action, CO 2, [SDE]Environmental Sciences, Carbon dioxide, Plant cover, Environmental science
Abstract

The dataset (Data File S1; DOI: 10.6084/m9.figshare.8863721) and the R code used to generate the results (Code S1; DOI: 10.6084/m9.figshare.8863655), including step by step explanations of the statistical tests, have been deposited in Figshare Digital Repository (https://figshare.com/projects/Sediment_Respiration_Pulses_in_Intermittent_Rivers_and_Ephemeral_Streams/66104)., Intermittent rivers and ephemeral streams (IRES) may represent over half the global stream network, but their contribution to respiration and carbon dioxide (CO2) emissions is largely undetermined. In particular, little is known about the variability and drivers of respiration in IRES sediments upon rewetting, which could result in large pulses of CO2. We present a global study examining sediments from 200 dry IRES reaches spanning multiple biomes. Results from standardized assays show that mean respiration increased 32–66-fold upon sediment rewetting. Structural equation modelling indicates that this response was driven by sediment texture and organic matter quantity and quality, which, in turn, were influenced by climate, land use and riparian plant cover. Our estimates suggest that respiration pulses resulting from rewetting of IRES sediments could contribute significantly to annual CO2 emissions from the global stream network, with a single respiration pulse potentially increasing emission by 0.2–0.7%. As the spatial and temporal extent of IRES increases globally, our results highlight the importance of recognizing the influence of wetting-drying cycles on respiration and CO2 emissions in stream networks., We thank Y. Etxeberria, L. Sánchez, C. Gutiérrez, G. LeGoff and B. Launay for laboratory support. DvS was supported by a Short-Term Scientific Mission of the COST Action CA15113 (SMIRES, Science and Management of Intermittent Rivers and Ephemeral Streams, www.smires.eu), supported by COST (European Cooperation in Science and Technology) and received additional funding from the EU’s 7th Framework Programme for research, technological development and demonstration under grant agreement No. 603629 (GLOBAQUA) and a Grant for Research Groups of the Basque University System (IT-951-16) funded by the Basque Government. RM and BO were supported by the Spanish Ministry of Science, Innovation and Universities through project C-HYDROCHANGE (CGL2017-86788-C3-2-P and CGL2017-86788-C3-3-P). FA was funded by the Swiss National Science Foundation grants No. PP00P3_150698 and PP00P3_179089. NC was supported by the EU project LIFE+ TRivers (LIFE13 ENV/ES/000341). SDL received funding from the EU’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 748625. PP and MP were supported by INTER-COST project LTC17017. The authors declare that they have no competing interests.

Published
2019
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3. A global analysis of terrestrial plant litter dynamics in non-perennial waterways

Author

Roland Corti, Clara Mendoza-Lera, Ross Vander Vorste, María Isabel Arce, Iola G. Boëchat, Ryan M. Burrows, A. Uzan, Jonathan C. Marshall, Nick Bond, Cleo Woelfle-Erskine, Christopher T. Robinson, S. Kubheka, Damien Banas, Vladimir Pešić, Arnaud Foulquier, Klement Tockner, Nathan J. Waltham, Núria Cid, Thibault Datry, Michael T. Bogan, Marcos Moleón, Melanie L. Blanchette, Björn Gücker, Brian Four, Sudeep D. Ghate, Michael Danger, Musa C. Mlambo, V. D. Diaz-Villanueva, Florian Altermatt, Rosa Gómez, K. C. Brintrup Barría, Evans De La Barra, Manuela Morais, Richard G. Storey, Robert J. Rolls, Bianca de Freitas Terra, Tommaso Cancellario, Nabor Moya, A. M. De Girolamo, Arturo Elosegi, Chelsea J. Little, Amina Taleb, Ana Savić, R. del Campo, Simone Guareschi, Dominik Zak, Elisabeth I. Meyer, J. I. Jones, Annamaria Zoppini, Dev K. Niyogi, Peter M. Negus, Manuel A. S. Graça, Isabel Pardo, Pablo Rodríguez-Lozano, Eduardo J. Martín, Kate S. Boersma, Petr Pařil, Erin E. Beller, Alex Laini, Kandikere R. Sridhar, Cristina Canhoto, Felicitas Hoppeler, D. von Schiller, Shai Arnon, Rachel Stubbington, Sarig Gafny, Alisha L. Steward, Núria Bonada, Lluís Gómez-Gener, Ricardo J. Albariño, A. Papatheodoulou, Joanna Blessing, Steffen U. Pauls, Juan F. Blanco-Libreros, Simone D. Langhans, Christiane Zarfl, Jean-Christophe Clément, Mark O. Gessner, Angus R. McIntosh, Fiona Dyer, Oleksandra Shumilova, Catherine M. Febria, Marek Polášek, Stefan Lorenz, Sophie Cauvy-Fraunié, Stephanie M. Carlson, Andy Banegas-Medina, Jason L. Hwan, M. M. Sánchez-Montoya, Daniel C. Allen, Catherine Leigh, Emile Faye, Marko Miliša, Andreas Bruder, Milieux aquatiques, écologie et pollutions (UR MALY), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Laboratoire d'Ecologie Alpine (LECA ), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB), Leibniz Association, Universidad del Pais Vasco / Euskal Herriko Unibertsitatea [Espagne] (UPV/EHU), Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), School of Geography and the Environment [Oxford] (SoGE), University of Oxford [Oxford], Instituto de Investigación en Paleobiología y Geología [Río Negro] (IIPG), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional de Río Negro (UNRN), Unité de Recherches Animal et Fonctionnalités des Produits Animaux (URAFPA), Université de Lorraine (UL)-Institut National de la Recherche Agronomique (INRA), Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Terre et Environnement de Lorraine (OTELo), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Department of Plant Biology and Ecology, University of the Basque Country, Intelligent Control Systems Laboratory (ICSL), Griffith University [Brisbane], Conseil Général du Rhône, Département du Rhône, Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Purdue University [West Lafayette], Centro de investigaciones biológicas, Spanish National Research Council (CSIC), Klinik für Diagnostische und Interventionelle Radiologie, Universitätsklinikum Ulm - University Hospital of Ulm, Department of Biosciences [Mangalore], Mangalore University, Langenberg, Heike, Goldin, Tamara, Plail, Melissa, Laboratoire d'Ecologie Alpine (LECA), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Université Joseph Fourier - Grenoble 1 (UJF)-Université Grenoble Alpes (UGA), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA), School of Geography and the Environment [Oxford], Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Milieux aquatiques, écologie et pollutions ( UR MALY ), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture ( IRSTEA ), Laboratoire d'Ecologie Alpine ( LECA ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), Leibniz Institute of Freshwater Ecology & Inland Fisheries, Universidad del Pais Vasco / Euskal Herriko Unibertsitatea ( UPV/EHU ), Leibniz-Institute of Freshwater Ecology and Inland Fisheries ( IGB ), Freie Universität Berlin [Berlin], Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques ( CARRTEL ), Institut National de la Recherche Agronomique ( INRA ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ), Laboratoire Environnement Géomécanique et Ouvrages ( LAEGO ), Institut National Polytechnique de Lorraine ( INPL ), Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Unité de Recherches Animal et Fonctionnalités des Produits Animaux ( URAFPA ), Institut National de la Recherche Agronomique ( INRA ) -Université de Lorraine ( UL ), Universitat de Barcelona ( UB ), Laboratoire Interdisciplinaire des Environnements Continentaux ( LIEC ), Université de Lorraine ( UL ) -Centre National de la Recherche Scientifique ( CNRS ), Centre d'études et de recherches appliquées à la gestion ( CERAG ), Université Pierre Mendès France - Grenoble 2 ( UPMF ) -Centre National de la Recherche Scientifique ( CNRS ), Intelligent Control Systems Laboratory ( ICSL ), Griffith University, Science et Ingénierie des Matériaux et Procédés ( SIMaP ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National Polytechnique de Grenoble ( INPG ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Spanish National Research Council ( CSIC ), Universitätsklinikum Ulm, Organic Chemistry Division-I, Indian Institute of Chemical Technology, Hyderabad-500 007, India, Institut de Recherches Subatomiques ( IReS ), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique ( CNRS )

Subjects
0106 biological sciences, RIVERS, 010504 meteorology & atmospheric sciences, Perennial plant, ved/biology.organism_classification_rank.species, C CYCLE, SEQUESTRATION, 01 natural sciences, [ SDE ] Environmental Sciences, ECOSYSTEMS, ZONE CLIMATIQUE, 212 dry riverbeds, ComputingMilieux_MISCELLANEOUS, DROUGHT, CLIMATE-CHANGE, geography.geographical_feature_category, CYCLE DU CARBONE, Plant litter, CARBON-DIOXIDE EMISSIONS, 6. Clean water, global research, CO2 EMISSION, [ SDE.MCG ] Environmental Sciences/Global Changes, TEMPORARY RIVERS, [SDE]Environmental Sciences, Ecosystem ecology, DECOMPOSITION, riverbeds, P40 - Météorologie et climatologie, [SDE.MCG]Environmental Sciences/Global Changes, VÉGÉTATION RIPICOLE, ephemeral streams, ECOLOGY, Terrestrial plant, [ SDU.ENVI ] Sciences of the Universe [physics]/Continental interfaces, environment, STREAMS, P10 - Ressources en eau et leur gestion, GLOBAL CHANGE, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, 0105 earth and related environmental sciences, Riparian zone, RIVER ECOSYSTEM FUNCTIONING, Hydrology, geography, ved/biology, 010604 marine biology & hydrobiology, RIPARIAN VEGETATION, Global change, 15. Life on land, Arid, global change, river ecosystem functioning, CO2 emissions, temporary rivers, riparian vegetation, C cycle, COURS D'EAU, 13. Climate action, CO2 EMISSIONS, CHANGEMENT CLIMATIQUE, C-CYCLING, PATTERNS, Litter, General Earth and Planetary Sciences, Environmental science, terrestrial plant litter, intermittent rivers, MATTER, LITIÈRE VÉGÉTALE
Abstract

International audience; Perennial rivers and streams make a disproportionate contribution to global carbon (C) cycling. However, the contribution of intermittent rivers and ephemeral streams (IRES), which sometimes cease to flow and can dry completely, is largely ignored although they represent over half the global river network. Substantial amounts of terrestrial plant litter (TPL) accumulate in dry riverbeds and, upon rewetting, this material can undergo rapid microbial processing. We present the results of a global research collaboration that collected and analysed TPL from 212 dry riverbeds across major environmental gradients and climate zones. We assessed litter decomposability by quantifying the litter carbon-to-nitrogen ratio and oxygen (O2) consumption in standardized assays and estimated the potential short-term CO2 emissions during rewetting events. Aridity, cover of riparian vegetation, channel width and dry-phase duration explained most variability in the quantity and decomposability of plant litter in IRES. Our estimates indicate that a single pulse of CO2 emission upon litter rewetting contributes up to 10% of the daily CO2 emission from perennial rivers and stream, particularly in temperate climates. This indicates that the contributions of IRES should be included in global C-cycling assessments.

Published
2018
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4. Author Correction: A global analysis of terrestrial plant litter dynamics in non-perennial waterways

Author

Ana Savić, Elisabeth I. Meyer, Ross Vander Vorste, Núria Cid, M. M. Sánchez-Montoya, S. Gafny, J. I. Jones, Christopher T. Robinson, Arnaud Foulquier, Marko Miliša, María Isabel Arce, A. Papatheodoulou, Cleo Woelfle-Erskine, S. Kubheka, Michael T. Bogan, Damien Banas, Björn Gücker, Chelsea J. Little, Isabel Pardo, Nabor Moya, Ahmed Taleb, Simone Guareschi, Nathan J. Waltham, V. D. Diaz-Villanueva, R. del Campo, Manuela Morais, Annamaria Zoppini, Erin E. Beller, Alex Laini, Manuel A. S. Graça, Clara Mendoza-Lera, Petr Pařil, Kate S. Boersma, Ricardo J. Albariño, Shai Arnon, Melanie L. Blanchette, Daniel C. Allen, Catherine Leigh, Klement Tockner, D. von Schiller, Nick Bond, Pablo Rodríguez-Lozano, Emile Faye, Jason L. Hwan, Rosa Gómez, Iola G. Boëchat, Ryan M. Burrows, Brian Four, Dominik Zak, Jonathan C. Marshall, E. Martín, Florian Altermatt, Marcos Moleón, Bianca de Freitas Terra, Michael Danger, Musa C. Mlambo, F. Hoppeler, Evans De La Barra, Núria Bonada, Steffen U. Pauls, A. Uzan, Stefan Lorenz, Peter M. Negus, Lluís Gómez-Gener, Vladimir Pešić, Mark O. Gessner, Robert J. Rolls, Andreas Bruder, Fiona Dyer, Oleksandra Shumilova, Roland Corti, Cristina Canhoto, Sudeep D. Ghate, Marek Polášek, Stephanie M. Carlson, Andy Banegas-Medina, K. R. Sridhar, Richard G. Storey, Joanna Blessing, Thibault Datry, Christiane Zarfl, Angus R. McIntosh, Juan F. Blanco-Libreros, Simone D. Langhans, Jean-Christophe Clément, K. C. Brintrup Barría, Rachel Stubbington, Catherine M. Febria, Sophie Cauvy-Fraunié, Alisha L. Steward, Tommaso Cancellario, A. M. De Girolamo, Arturo Elosegi, and Dev K. Niyogi

Subjects
Hydrology (agriculture), Perennial plant, Ecology, ved/biology, Terrestrial plant, ved/biology.organism_classification_rank.species, Litter, General Earth and Planetary Sciences, Environmental science, Freshwater ecology, Carbon cycle
Abstract

Correction to: Nature Geoscience https://doi.org/10.1038/s41561-018-0134-4, published online 21 May 2018. In the version of this Article originally published, the affiliation for M. I. Arce was incorrect; it should have been: 5Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany. This has now been corrected in the online versions of the Article.

Published
2018
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5. ULAKA LWABANGUNI

Author

I. S. KUBHEKA and M. A. Hlengwa

Subjects
Linguistics and Language, Literature and Literary Theory, Language and Linguistics
Published
1993
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6. South African inflation modelling using bootstrapped long short-term memory methods.

Author

Kubheka S

Abstract

Inflation is a critical economic series, and proper targeting is required for a stable economy. With the current economic conditions that the world has faced as a result of COVID-19, understanding the effects of this on economies is critical because it will guide policies. Recent research on South African inflation has focused on statistical modelling, specifically the ARFIMA, GARCH, and GJR-GARCH models. In this study, we extend this into deep learning and use the MSE, RMSE, RSMPE, MAE, and MAPE to assess performance. To test which model has better forecasts, we use the Diebold-Mariano test. According to the findings of this study, clustered bootstrap LSTM models outperform the previously used ARFIMA-GARCH and ARFIMA-GJR-GARCH models., Competing Interests: Conflict of interestNot applicable., (© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)

Published
2023
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7. Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter.

Author

Shumilova O, Zak D, Datry T, von Schiller D, Corti R, Foulquier A, Obrador B, Tockner K, Allan DC, Altermatt F, Arce MI, Arnon S, Banas D, Banegas-Medina A, Beller E, Blanchette ML, Blanco-Libreros JF, Blessing J, Boëchat IG, Boersma K, Bogan MT, Bonada N, Bond NR, Brintrup K, Bruder A, Burrows R, Cancellario T, Carlson SM, Cauvy-Fraunié S, Cid N, Danger M, de Freitas Terra B, Girolamo AM, Del Campo R, Dyer F, Elosegi A, Faye E, Febria C, Figueroa R, Four B, Gessner MO, Gnohossou P, Cerezo RG, Gomez-Gener L, Graça MAS, Guareschi S, Gücker B, Hwan JL, Kubheka S, Langhans SD, Leigh C, Little CJ, Lorenz S, Marshall J, McIntosh A, Mendoza-Lera C, Meyer EI, Miliša M, Mlambo MC, Moleón M, Negus P, Niyogi D, Papatheodoulou A, Pardo I, Paril P, Pešić V, Rodriguez-Lozano P, Rolls RJ, Sanchez-Montoya MM, Savić A, Steward A, Stubbington R, Taleb A, Vorste RV, Waltham N, Zoppini A, and Zarfl C

Subjects
Biofilms growth & development, Biological Availability, Climate, Climate Change, Geologic Sediments chemistry, Nitrates analysis, Plant Leaves chemistry, Nutrients analysis, Organic Chemicals analysis, Rivers chemistry
Abstract

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., (© 2019 The Authors. Global Change Biology Published by John Wiley & Sons Ltd.)

Published
2019
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