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16 results on '"Iola G. Boëchat"'

1. Eutrophication effects on fatty acid profiles of seston and omnivorous fish in tropical reservoirs

Author

Iola G. Boëchat, Cleber Cunha Figueredo, Rayssa de Lima Cardoso, Björn Gücker, Marcelo Luiz Martins Pompêo, Lucas Chagas Oliveira, Lídia Sumile Maruyama, Carlos Eduardo Tolussi, Victor Hugo Marques, Fernando Ribeiro Gomes, Renata Guimarães Moreira, Marcela Muñoz-Peñuela, Aline Dal’Olio Gomes, Universidade de São Paulo (USP), Universidade Federal São João del-Rei, Universidade Anhembi Morumbi, Universidade Federal de Minas Gerais (UFMG), Instituto de Pesca, and Universidade Estadual Paulista (Unesp)

Subjects
Environmental Engineering, 010504 meteorology & atmospheric sciences, Zoology, 010501 environmental sciences, Biology, 01 natural sciences, Phytoplankton, Astyanax, Animals, Environmental Chemistry, CHARACIFORMES, Waste Management and Disposal, 0105 earth and related environmental sciences, Trophic level, Diatoms, chemistry.chemical_classification, Fatty Acids, Seston, Fatty acid, Eutrophication, Pollution, Food web, chemistry, Water pollution, Saturated fatty acid, Polyunsaturated fatty acids, Trophic transfer, Brazil, Polyunsaturated fatty acid
Abstract

Made available in DSpace on 2021-06-25T10:29:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-08-10 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) It has been postulated that eutrophication causes replacement of n3 highly unsaturated fatty acids (n3 HUFA) rich taxa, such as Bacillariophyta, Cryptophyta and Dinophyta, with taxa poor in these fatty acids (FA), such as Chlorophyta and Cyanobacteria. Such a change in community composition at the basis of the food web may alter the FA composition of consumer tissues. Here, we investigated the effects of eutrophication on phytoplankton composition and FA profiles of seston and muscle of two omnivorous fish species (Astyanax fasciatus and Astyanax altiparanae) from reservoirs of different trophic status in Southeast Brazil. The phytoplankton composition and seston FA profiles reflected the degree of eutrophication at most of the studied sites. Three of the five most eutrophic sites were dominated by cyanobacteria and had the highest saturated fatty acid (SFA) and lowest polyunsaturated fatty acid (PUFA) relative contents among all sites. In contrast, the remaining two sites presented a higher phytoplankton diversity and higher relative contribution of sestonic PUFAs with 18 carbons (C18) and HUFAs than less eutrophic systems. However, there were no clear effects of sestonic FA profiles on the FA profiles of muscle of both fish species. A higher percentage of n3 HUFAs was found in the fish samples from a hypereutrophic and cyanobacteria dominated reservoir than in those from sites with a more diverse phytoplankton community in which fish mainly showed higher percentages of C18 PUFA. These results suggest a lack of a direct relationship between the degree of eutrophication and the percentage of n3 HUFAs in both fish species, which can be caused by specific characteristics of the reservoirs that may modulate eutrophication effects. Therefore, consumer FA biochemistry seemed to be dictated by their ability to select, accumulate, and modify dietary FAs, rather than by the eutrophication degree of the studied tropical reservoirs. Departamento de Fisiologia Instituto de Biociências Universidade de São Paulo, Rua do Matão, 101 Departamento de Geociências Universidade Federal São João del-Rei Universidade Anhembi Morumbi, Campus Mooca Departamento de Botânica Universidade Federal de Minas Gerais Centro de Pesquisa de Recursos Hídricos Instituto de Pesca Departamento de Ecologia Instituto de Biociências Universidade de São Paulo Universidade Estadual Paulista (Unesp) Instituto de Ciência e Tecnologia Universidade Estadual Paulista (Unesp) Instituto de Ciência e Tecnologia FAPESP: 2014/16320-7 FAPESP: 2016/07363-0 FAPESP: 2017/11530-1

Published
2021

2. Impacts of fish farming on elemental stoichiometry, fluorescence components, and stable isotopes of dissolved organic matter in a tropical reservoir

Author

Cleber Cunha Figueredo, Björn Gücker, Ronaldo César Chaves, and Iola G. Boëchat

Subjects
010504 meteorology & atmospheric sciences, Health, Toxicology and Mutagenesis, Fish farming, Fisheries, 010501 environmental sciences, Toxicology, 01 natural sciences, Nile tilapia, Aquaculture, Isotopes, Dissolved organic carbon, Organic matter, Ecosystem, 0105 earth and related environmental sciences, chemistry.chemical_classification, biology, business.industry, Tropics, Agriculture, General Medicine, biology.organism_classification, Pollution, Spectrometry, Fluorescence, chemistry, Environmental chemistry, Environmental science, business, Eutrophication, Brazil, Environmental Monitoring
Abstract

Aquaculture impacts on aquatic organic matter and ecosystem integrity are poorly understood, especially in tropical regions. Here, we investigated the impacts of Nile tilapia net cage farming on the elemental stoichiometry, fluorescence components, and stable isotopes of dissolved organic matter (DOM) of the large, tropical Furnas Reservoir (SE Brazil). Early-stage fish farming, i.e., relatively small and recently implemented farms, had detectable incipient effects on DOM characteristics, and these effects differed between reservoir branches. In the less eutrophic Rio Grande branch of the reservoir, we found a reduction in natural humic-like DOM components and an increase in a protein-like DOM component as far as 100 m away from fish farms. Further, we observed a decrease in δ15N-TDN due to fish farming. In the more eutrophic Rio Sapucai branch, there were only local decreases in C:N ratios, as well as rises in C:P and N:P of DOM due to fish farming. These results suggest that early-stage fish farming had local but detectable effects on aquatic DOM that depended on previous eutrophication levels and highlight the need to assess the early impacts of fish farming on tropical reservoirs by combining different monitoring strategies.

Published
2020

3. Fatty acids reveal aquaculture and drought effects on a large tropical reservoir

Author

Angela Krüger, A.M. Contin, G.H.P. Abrantes, E.M. Soares, F.S. Cardozo, Björn Gücker, Iola G. Boëchat, P.L. Pinheiro, and Cleber Cunha Figueredo

Subjects
Environmental Engineering, 010504 meteorology & atmospheric sciences, Fish farming, Aquaculture, 010501 environmental sciences, 01 natural sciences, Commercial fish feed, Environmental Chemistry, Animals, Ecosystem, Waste Management and Disposal, 0105 earth and related environmental sciences, Ecology, business.industry, Aquatic ecosystem, Seston, Fatty Acids, Pollution, Droughts, Agriculture, Environmental science, Eutrophication, business, Brazil, Environmental Monitoring
Abstract

Fatty acids (FAs) and their metrics have been used to detect and assess the impacts of urbanization and agriculture on aquatic ecosystems. Here, we investigated whether seston FAs are also useful to characterize and understand early-stage aquaculture impacts in a large tropical reservoir (Furnas Reservoir, SE Brazil). We tested the hypothesis that single FAs, as well as selected FA metrics in the seston fraction, are efficient markers of net-cage fish farming effects. In general, fish farming had only minor effects on standard water chemical variables, mainly small increases in ammonium, nitrate, and dissolved organic nitrogen concentrations. By increasing concentrations of several polyunsaturated FAs, early-stage fish farming improved sestonic food quality in the more oligotrophic branch of the reservoir under drought conditions. However, in general, increases in concentrations of bacterial FAs, due to fish farming, suggested organic matter (OM) subsidies from non-ingested and non-assimilated fish feed. In the more eutrophic reservoir branch, seston FA profiles suggested that fish farming caused an increase of low-quality food resources, such as cyanobacteria. Thus, background impact levels may determine the biochemical responses of tropical reservoirs to fish farming. Higher contributions of potentially sewage-derived and bacterial FAs during drought conditions, especially at reference sites of the more oligotrophic branch, suggested that drought shifted OM inputs towards anthropogenic sources, thereby overwriting land-use related differences between reservoir branches and homogenizing their environmental conditions. In conclusion, FA variables were useful to evaluate and understand environmental conditions, as well as the effects of early-stage fish farming and drought, and should be considered in impact assessments in tropical lentic ecosystems.

Published
2020

4. Nutrient Limitation and the Stoichiometry of Nutrient Uptake in a Tropical Rain Forest Stream

Author

Timothy P. Moulton, Rafael Feijó-Lima, Björn Gücker, Steven A. Thomas, Flavia Tromboni, Eduardo F. Silva-Junior, Christine Lourenço-Amorim, Vinicius Neres-Lima, Eugenia Zandonà, and Iola G. Boëchat

Subjects
0106 biological sciences, Atmospheric Science, 010504 meteorology & atmospheric sciences, Ecology, 010604 marine biology & hydrobiology, Heterotroph, Paleontology, Soil Science, Forestry, Aquatic Science, 01 natural sciences, Tropical rain forest, Nutrient, Environmental chemistry, Environmental science, Autotroph, Periphyton, 0105 earth and related environmental sciences, Water Science and Technology
Published
2018
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5. Consumer-resource stoichiometry as a predictor of trophic discrimination (Δ13C, Δ15N) in aquatic invertebrates

Author

Björn Gücker, Daniel von Schiller, Daniel Graeber, Iola G. Boëchat, Thomas Mehner, Mario Brauns, and Ana Paula C. de Carvalho

Subjects
0106 biological sciences, Resource (biology), δ13C, Stable isotope ratio, Ecology, 010604 marine biology & hydrobiology, Phosphorus, chemistry.chemical_element, δ15N, Aquatic Science, 010603 evolutionary biology, 01 natural sciences, chemistry, Isotopes of carbon, Ecological stoichiometry, Environmental science, Trophic level
Published
2018
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6. Glifosato no Brasil

Author

Björn Gücker, Iola G. Boëchat, and Igor Lima

Subjects
0303 health sciences, 03 medical and health sciences, General Medicine, 010501 environmental sciences, 01 natural sciences, 030304 developmental biology, 0105 earth and related environmental sciences
Abstract

Os herbicidas à base de glifosato têm amplo espectro de ação e estão associados a uma série de impactos ambientais. O glifosato é amplamente utilizado em áreas agrícolas e urbanas e é frequentemente encontrado em águas superficiais e no solo. Apresenta efeitos nocivos para o funcionamento ecossistêmico, devido à sua toxicidade para organismos de todos os níveis tróficos, além de casos de bioacumulação relatados. Além disso, a contaminação de recursos hídricos com glifosato põe em perigo a saúde humana. Medidas de mitigação são necessárias para reduzir os impactos do glifosato na saúde ecossistêmica e humana, com controles mais rígidos necessários para prevenir a sua crescente contaminação em águas superficiais e subterrâneas no território brasileiro.

Published
2021
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7. Fluorescence indices of dissolved organic matter as early warning signals of fish farming impacts in a large tropical reservoir

Author

Björn Gücker, Juliana Trindade Marques de Oliveira, Cleber Cunha Figueredo, Ronaldo César Chaves, and Iola G. Boëchat

Subjects
0106 biological sciences, Biochemical oxygen demand, Ecology, business.industry, Fish farming, Aquatic ecosystem, General Decision Sciences, 010501 environmental sciences, 010603 evolutionary biology, 01 natural sciences, Humus, Nutrient, Aquaculture, Environmental chemistry, Dissolved organic carbon, Environmental science, business, Transect, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences
Abstract

Dissolved organic matter (DOM) can be an important source of energy and nutrients in aquatic ecosystems and play important roles in carbon and nutrient dynamics of natural and impacted environments. In order to assess the effects of early stage fish farming on dissolved organic carbon (DOC) concentrations as well as DOM fluorescence indices, we took water samples along transects from six fish farms towards reference sites in a large tropical reservoir (Furnas Reservoir, Southeast Brazil) between April 2013 and December 2016. While DOC concentrations did no change along transects, small but significant changes in fluorescence indices were detectable in up to 100 m from fish farms. Higher fluorescence index (FI) values near fish farms pointed to small increases in microbial production due to fish farming. Only in the more pristine of the two main reservoir branches, small differences in the freshness index (β:α) and the peak T/peak C ratio along transects indicated that the relative contribution of recently produced DOM and the biochemical oxygen demand of DOM increased due to aquaculture. The humification index did not respond to fish farming. In summary, current early-stage fish farming did not appear to cause major impacts on DOM quantity and quality, but future increases in net cage and fish farm densities, as well as longer operation times may change this assessment. The fluorescence indices FI, β:α and peak T/peak C ratio may be useful early warning signals for monitoring fish farm impacts in tropical reservoirs.

Published
2020
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8. 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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9. Simulating rewetting events in intermittent rivers and ephemeral streams: a global analysis of leached nutrients and organic matter

Author

Arnaud Foulquier, Michael T. Bogan, Björn Gücker, Roland Corti, Daniel von Schiller, Pablo Rodríguez-Lozano, Fiona Dyer, Vladimir Pešić, Stefan Lorenz, Klement Tockner, Jonathan C. Marshall, Lluís Gómez-Gener, Ana Savić, Thibault Datry, Dominik Zak, Rubén del Campo, Marcos Moleón, Clara Mendoza-Lera, Elisabeth I. Meyer, Chelsea J. Little, Simone Guareschi, Ross Vander Vorste, Richardo Figueroa, Florian Altermatt, Michael Danger, Oleksandra Shumilova, Musa C. Mlambo, Rosa Gómez Cerezo, Annamaria Zoppini, Joanna Blessing, Kate S. Boersma, Petr Paril, Núria Bonada, Alisha L. Steward, Christiane Zarfl, Amina Taleb, Manuel A. S. Graça, Juan F. Blanco-Libreros, Peter M. Negus, Isabel Pardo, Iola G. Boëchat, Ryan M. Burrows, Stephanie M. Carlson, Angus R. McIntosh, Mark O. Gessner, Andy Banegas-Medina, Simone D. Langhans, María Isabel Arce, Kate Brintrup, Rachel Stubbington, Pierre Gnohossou, Biel Obrador, Athina Papatheodoulou, Erin E. Beller, Nick Bond, Shai Arnon, Robert J. Rolls, Brian Four, Catherine M. Febria, Sophie Cauvy-Fraunié, Bianca de Freitas Terra, Catherine Leigh, Emile Faye, Andreas Bruder, Daniel C. Allan, Jason L. Hwan, Núria Cid, Skhumbuzo Kubheka, Damien Banas, Nathan J. Waltham, M. M. Sánchez-Montoya, Arturo Elosegi, Marko Miliša, Dev K. Niyogi, Anna Maria De Girolamo, Tommaso Cancellario, Melanie L. Blanchette, European Commission, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Freie Universität Berlin, University of Trento, Universität Rostock, Aarhus University, Institut National de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture (IRSTEA), University of the Basque Country (University of the Basque Country), 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), Centre National de la Recherche Scientifique (CNRS), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), University of Barcelona, Austrian Science Fund (FWF), University of Oklahoma (OU), University of Zurich, Centro de Edafologia y Biologia Aplicada del Segura, 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 California [Berkeley], University of California, Edith Cowan University, University of Antioquia, Queensland Government, Universidade Federal de São João del-Rei (UFSJ), University of California [San Diego] (UC San Diego), University of Arizona, Universitat Autònoma de Barcelona [Barcelona] (UAB), La Trobe University, University of Applied Sciences and Arts Switzerland, Griffith University [Brisbane], University of Navarra, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Université de Lorraine (UL), Universidade Estadual Vale do Acarau, National Council of Research, Water Research Institute, Universidad de Murcia, University of Canberra, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), University of Canterbury, University of Windsor, Département Ecologie des Forêts, Prairies et milieux Aquatiques (DEPT EFPA), Institut National de la Recherche Agronomique (INRA), Berlin Institute of Technology, Université de Parakou, Umea University, University of Coimbra, Ezemvelo KZN Wildlife, University of Otago [Dunedin, Nouvelle-Zélande], Basque Centre for Climate Change (BC3), Queensland University of Technology, Swiss Federal Institute of Aquatic Science and Technology (EAWAG), Julius Kühn-Institut (JKI), Brandenburg University of Technology, University of Münster, University of Zagreb, Rhodes University, Universidad de Granada (UGR), Missouri University of Science and Technology (Missouri S&T), University of Missouri System, Terra Cypria - Cyprus Conservation Foundation, Universidate de Vigo, Masaryk University, University of Montenegro (UCG), University of New England (UNE), University of Niš, Nottingham Trent University, Université de Tlemcen, James Cook University (JCU), University of Tübingen, Aarhus University [Aarhus], 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]), Universitat Autònoma de Barcelona (UAB), 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), University of Canterbury [Christchurch], University of Windsor [Ca], Université de Parakou (UP), Department of Ecology and Environmental Science [Umeå], Umeå University, Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf] (EAWAG), Rhodes University, Grahamstown, Universidade de Vigo, and Masaryk University [Brno] (MUNI)

Subjects
0106 biological sciences, Geologic Sediments, sédiment, 010504 meteorology & atmospheric sciences, Climate, rehumectation, 01 natural sciences, Substance nutritive, Klimatforskning, chemistry.chemical_compound, zone humide temporaire, Nutrient, Nitrate, matière organique dissoute, Dissolved organic carbon, Canvi climàtic, Primary Research Article, Organic Chemicals, General Environmental Science, chemistry.chemical_classification, Global and Planetary Change, leaf litter, cycle des nutriments, Ecology, zone climatique, Litière végétale, Sediments fluvials, sediments, Lessivage du sol, 6. Clean water, Lixiviació, biofilms, leaching, rewetting, temporary rivers, climatic region, climate change, Environmental chemistry, Leaching (pedology), Biogeochemical cycle, Climate Research, P40 - Météorologie et climatologie, [SDE.MCG]Environmental Sciences/Global Changes, Cours d'eau, Climate change, Biological Availability, 010603 evolutionary biology, River sediments, Sécheresse, biodisponibilité, Rivers, Environmental Chemistry, Organic matter, litière du sol, Matière organique, P10 - Ressources en eau et leur gestion, variation géographique, 0105 earth and related environmental sciences, Changement climatique, Nitrates, entraînement par lessivage, P35 - Fertilité du sol, Nutrients, 15. Life on land, Primary Research Articles, Arid, Climatic change, Plant Leaves, chemistry, 13. Climate action, Environmental science, bioavailability
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., In this study we experimentally simulated under laboratory conditions rewetting of leaves, riverbed sediments, and epilithic biofilms collected during the dry phase from intermittent rivers and ephemeral streams covering global spatial scale. We determined the amounts and quality of the leached nutrients and dissolved organic matter, assessed their inter‐substrate and cross‐climate differences, and estimated areal fluxes from 1 m2 of riverbeds. In addition, we evaluated the variance in leachate characteristics related to selected environmental variables and substrate characteristics.

Published
2019
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10. Dissolved nutrient exports from natural and human-impacted Neotropical catchments

Author

José A. F. Monteiro, E. N. Jack Brookshire, Björn Gücker, Ricky Cássio Santos da Silva, Daniel Graeber, Ronaldo César Chaves, and Iola G. Boëchat

Subjects
0106 biological sciences, Global and Planetary Change, Biogeochemical cycle, 010504 meteorology & atmospheric sciences, Ecology, Land use, Intensive farming, Agroforestry, 010604 marine biology & hydrobiology, Biome, 01 natural sciences, Nutrient, Temperate climate, Environmental science, Dominance (ecology), Land use, land-use change and forestry, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences
Abstract

Aim Neotropical biomes are highly threatened by land-use changes, but the catchment-wide biogeochemical effects are poorly understood. Here, we aim to compare exports of dissolved nitrogen (N) and phosphorus (P) from natural and human-impacted catchments in the Neotropics. Location Neotropics. Methods We measured streamwater nutrient concentrations and exports in 20 south-eastern Brazilian catchments with different land uses (natural Cerrado/semi-deciduous forest, pasture, intensive agriculture and urban areas) and conducted a meta-analysis on nutrient exports from Neotropical catchments, both natural and human-impacted. Results Organic forms dominated dissolved nutrient exports in central/south-east Brazil in both natural and human-dominated catchments. Our meta-analysis suggests that there is wide geographic variability in the natural dominance of organic versus inorganic nutrient exports across the Neotropics, and for N a tendency for inorganic and organic forms to vary inversely across sites. We found strong land-use effects, especially in urban areas. In areas naturally dominated by organic N exports, land use did not overturn that dominance, but rather increased the concentration of both inorganic and organic N. In catchments dominated by inorganic N exports or showing equivalent organic and inorganic exports, land use also caused organic exports to be dominant. Land-use effects on P were unclear, probably owing to a paucity of available data, but our results from south-east Brazil suggested that land use also increases dissolved P exports. Main conclusions We show that dominance of inorganic versus organic nutrient exports is highly variable across natural Neotropical catchments, a pattern contrasting with the general tendency for dominance of organic N in natural temperate catchments. Further, we found a general dominance of organic N in most human-impacted catchments, which is in contrast to strong dominance of inorganic N in most human-impacted temperate catchments. Finally, we find that urbanization exerts the strongest impacts on nutrient exports, thus underscoring wastewater treatment as a critical management priority under future land-use change.

Published
2016
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11. 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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12. Measurement uncertainty in stream nutrient uptake: Detecting land-use impacts on tropical streams

Author

Iola G. Boëchat and Björn Gücker

Subjects
0106 biological sciences, Ecology, General Decision Sciences, Climate change, Sampling (statistics), Soil science, STREAMS, 010501 environmental sciences, 010603 evolutionary biology, 01 natural sciences, Ecosystem services, Nutrient, TRACER, Environmental science, Measurement uncertainty, Stream restoration, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences
Abstract

Stream nutrient uptake is an important ecosystem service, because it supplies human needs such as water purification. Uncertainty in nutrient uptake measurement determines, in combination with effect magnitude, whether effects of land use, stream restoration or climate change can be detected by this method. However, measurement uncertainty for nutrient uptake metrics is rarely reported. Here, we compared whole-stream phosphate and nitrate uptake among three pristine and three agricultural tropical Cerrado streams. We quantified uncertainty in uptake metrics estimated by kinetic nutrient-addition experiments and evaluated their potential to detect land-use effects. Ambient phosphate and nitrate uptake lengths (SW) ranged from 11 to 106 m and from 29 to 357 m, respectively, in pristine streams and from 41 to 586 m and from 76 to 1372 m in agricultural streams. Moderate measurement uncertainty in SW allowed for the detection of land-use impacts with this metric. However, derived nutrient uptake metrics, such as ambient uptake rates and uptake velocities, as well as parameters of whole-stream saturation kinetics, were associated with high measurement uncertainties that prevented the detection of potential land-use effects. Sensitivity analyses suggested that avoiding high enrichment levels in kinetic addition experiments and increasing sampling effort for plateau nutrient and tracer concentration at the first and last sampling stations of investigated stream reaches are the most promising strategies to reduce measurement uncertainty. Analyzing nutrient uptake without considering measurement uncertainty might lead to poor interpretation in case studies and meta-analyses, such as incorrect evaluations of human impacts or comparisons among systems.

Published
2019
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13. Nitrogen and Phosphorus Uptake Dynamics in Tropical Cerrado Woodland Streams

Author

Flavia Tromboni, Nícolas Reinaldo Finkler, Davi Gasparini Fernandes Cunha, Björn Gücker, and Iola G. Boëchat

Subjects
inorganic chemicals, 0106 biological sciences, self-purification capacity, lcsh:Hydraulic engineering, River ecosystem, 010504 meteorology & atmospheric sciences, nutrient retention, tropical water bodies, Geography, Planning and Development, chemistry.chemical_element, STREAMS, Aquatic Science, 01 natural sciences, Biochemistry, chemistry.chemical_compound, lcsh:Water supply for domestic and industrial purposes, Nutrient, Nitrate, lcsh:TC1-978, Ecosystem, Tracer Additions for Spiraling Curve Characterization, 0105 earth and related environmental sciences, Water Science and Technology, Abiotic component, lcsh:TD201-500, 010604 marine biology & hydrobiology, Phosphorus, food and beverages, 15. Life on land, 6. Clean water, chemistry, Environmental chemistry, ENGENHARIA HIDRÁULICA, Environmental science, Cycling, low-order streams
Abstract

Pollution abatement through phosphorus and nitrogen retention is a key ecosystem service provided by streams. Human activities have been changing in-stream nutrient concentrations, thereby altering lotic ecosystem functioning, especially in developing countries. We estimated nutrient uptake metrics (ambient uptake length, areal uptake rate, and uptake velocity) for nitrate (NO3&ndash, N), ammonium (NH4&ndash, N), and soluble reactive phosphorus (SRP) in four tropical Cerrado headwater streams during 2017, through whole-stream nutrient addition experiments. According to multiple regression models, ambient SRP concentration was an important explanatory variable of nutrient uptake. Further, best models included ambient NO3&ndash, N and water velocity (for NO3&ndash, N uptake metrics), dissolved oxygen (DO) and canopy cover (for NH4&ndash, N), and DO, discharge, water velocity, and temperature (for SRP). The best kinetic models describing nutrient uptake were efficiency-loss (R2 from 0.47&ndash, 0.88) and first-order models (R2 from 0.60&ndash, 0.85). NO3&ndash, N, NH4&ndash, N, and SRP uptake in these streams seemed coupled as a result of complex interactions of biotic P limitation, abiotic P cycling processes, and the preferential uptake of NH4&ndash, N among N-forms. Global change effects on these tropical streams, such as temperature increase and nutrient enrichment due to urban and agricultural expansion, may have adverse and partially unpredictable impacts on whole-stream nutrient processing.

Published
2018
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14. Fatty acid composition of tropical fish depends on reservoir trophic status and fish feeding habit

Author

Iola G. Boëchat, Aline Dal’Olio Gomes, Carlos Eduardo Tolussi, Renato Massaaki Honji, Maíra P. T. Cortez, Marcelo Luiz Martins Pompêo, and Renata Guimarães Moreira

Subjects
0106 biological sciences, 0301 basic medicine, Linoleic acid, Fisheries, 01 natural sciences, Biochemistry, Hoplias malabaricus, 03 medical and health sciences, chemistry.chemical_compound, Food chain, POLUIÇÃO AMBIENTAL, Animals, Food science, Muscle, Skeletal, Ecosystem, Trophic level, chemistry.chemical_classification, biology, 010604 marine biology & hydrobiology, Organic Chemistry, Fatty Acids, Cell Biology, Feeding Behavior, biology.organism_classification, Eicosapentaenoic acid, Gastrointestinal Contents, 030104 developmental biology, chemistry, Adipose Tissue, Liver, lipids (amino acids, peptides, and proteins), Arachidonic acid, Omnivore, Characiformes, Brazil, Polyunsaturated fatty acid
Abstract

Eutrophication results in a deficiency of n-3 LC-PUFA (long-chain polyunsaturated fatty acids) in aquatic food chains, affecting fish nutrition and physiology. The trophic transfer of FA (fatty acids) to fish species of different feeding habits was investigated in two reservoirs in southeast Brazil-the mesotrophic Ponte Nova Reservoir (PN) and the hypereutrophic Billings Reservoir (Bil). Total FA profile of stomach contents and adipose tissue, triacylglycerols (TAG), and phospholipids (PL) from liver and muscle of the omnivorous Astyanax fasciatus and the carnivorous Hoplias malabaricus were analyzed by gas chromatography. A prevalence of n-6PUFA, as 18:2n-6 (linoleic acid) and 20:4n-6 (arachidonic acid, ARA) was observed in the stomach contents and in the tissues of A. fasciatus from the PN reservoir. In contrast, n-3 LC-PUFA, as 20:5n-3 (eicosapentaenoic acid, EPA) was accumulated in fish tissues from Bil, resulting in higher n3/n6 and EPA/ARA ratios, compared to fish from PN. This differential FA accumulation was also observed for H. malabaricus, but differences were slightly minor, and no changes were observed in the EPA/ARA ratios between fish from both reservoirs. Regardless reservoir, FA profiles of TAG resembled that of their diet, whereas FA profiles of PL were more conservative and mainly comprised by LC-PUFA. We conclude that reservoir trophic status affected the FA composition of food resources available to these fish species, resulting in differential allocation of n-3 and n-6 FA. As expected, FA profile of the investigated fish species also reflected their feeding habit and physiological demands.

Published
2016

15. Urbanization and agriculture increase exports and differentially alter elemental stoichiometry of dissolved organic matter (DOM) from tropical catchments

Author

José A. F. Monteiro, Björn Gücker, Ricky Cássio Santos da Silva, Daniel Graeber, and Iola G. Boëchat

Subjects
Total organic carbon, Hydrology, geography, Biogeochemical cycle, Environmental Engineering, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Drainage basin, Biogeochemistry, Rainforest, 010501 environmental sciences, Seasonality, medicine.disease, 01 natural sciences, Pollution, Deforestation, Dissolved organic carbon, medicine, Environmental Chemistry, Environmental science, Waste Management and Disposal, 0105 earth and related environmental sciences
Abstract

Many tropical biomes are threatened by rapid land-use change, but its catchment-wide biogeochemical effects are poorly understood. The few previous studies on DOM in tropical catchments suggest that deforestation and subsequent land use increase stream water dissolved organic carbon (DOC) concentrations, but consistent effects on DOM elemental stoichiometry have not yet been reported. Here, we studied stream water DOC concentrations, catchment DOC exports, and DOM elemental stoichiometry in 20 tropical catchments at the Cerrado–Atlantic rainforest transition, dominated by natural vegetation, pasture, intensive agriculture, and urban land cover. Streams draining pasture could be distinguished from those draining natural catchments by their lower DOC concentrations, with lower DOM C:N and C:P ratios. Catchments with intensive agriculture had higher DOC exports and lower DOM C:P ratios than natural catchments. Finally, with the highest DOC concentrations and exports, as well as the highest DOM C:P and N:P ratios, but the lowest C:N ratios among all land-use types, urbanized catchments had the strongest effects on catchment DOM. Thus, urbanization may have alleviated N limitation of heterotrophic DOM decomposition, but increased P limitation. Land use—especially urbanization—also affected the seasonality of catchment biogeochemistry. While natural catchments exhibited high DOC exports and concentrations, with high DOM C:P ratios in the rainy season only, urbanized catchments had high values in these variables throughout the year. Our results suggest that urbanization and pastoral land use exerted the strongest impacts on DOM biogeochemistry in the investigated tropical catchments and should thus be important targets for management and mitigation efforts.

Published
2015
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16. Global effects of agriculture on fluvial dissolved organic matter

Author

Jorge Nimptsch, Ricky Cássio Santos da Silva, Marlen Heinz, Mariana Meerhoff, Björn Gücker, Daniel von Schiller, Carlos Esse, Iola G. Boëchat, Jörg Gelbrecht, Daniel Graeber, Martin T. Pusch, Francisco Encina-Montoya, Elke Zwirnmann, Brian Kronvang, and Guillermo Goyenola

Subjects
Biogeochemical cycle, 010504 meteorology & atmospheric sciences, Nitrogen, Earth science, Fluvial, 010501 environmental sciences, 01 natural sciences, Article, Rivers, Agricultural land, Dissolved organic carbon, Temperate climate, Ecosystem, 0105 earth and related environmental sciences, Cursos d'aigua, 2. Zero hunger, Multidisciplinary, Intensive farming, Ecology, Agricultura, Environmental impact of agriculture, Agriculture, 15. Life on land, Carbon dioxide, 13. Climate action, Environmental science, Diòxid de carboni
Abstract

Agricultural land covers approximately 40% of Earth’s land surface and affects hydromorphological, biogeochemical and ecological characteristics of fluvial networks. In the northern temperate region, agriculture also strongly affects the amount and molecular composition of dissolved organic matter (DOM), which constitutes the main vector of carbon transport from soils to fluvial networks and to the sea and is involved in a large variety of biogeochemical processes. Here, we provide first evidence about the wider occurrence of agricultural impacts on the concentration and composition of fluvial DOM across climate zones of the northern and southern hemispheres. Both extensive and intensive farming altered fluvial DOM towards a more microbial and less plant-derived composition. Moreover, intensive farming significantly increased dissolved organic nitrogen (DON) concentrations. The DOM composition change and DON concentration increase differed among climate zones and could be related to the intensity of current and historical nitrogen fertilizer use. As a result of agriculture intensification, increased DON concentrations and a more microbial-like DOM composition likely will enhance the reactivity of catchment DOM emissions, thereby fuelling the biogeochemical processing in fluvial networks and resulting in higher ecosystem productivity and CO2 outgassing.

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