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1. Night-time measurements highly relevant for assessing stream CO2 fluxes: a Cross-European study

Author

Attermeyer, K., Audet, J., Barral Fraga, L., Basic, T., Bednarik, A., Busst, G., Casas Ruiz, J. P., Catalan, N., sophie Cauvy-Fraunié, Colls, M., Eyto, E., Deininger, A., Doretto, A., Doyle, B. C., Evtimova, V., Fenoglio, S., Fletcher, D., Fonvielle, J. A., Freixa, A., Fuss, T., Gilbert, P., Guttman Roberts, C., Herrero Ortega, S., Kenderov, L. A., Klaus, M., Ledesma, J. L. J., Lianqiu Liu, Mendoza Lera, C., Monteiro, J., Mor, J. R., Nagler, M., Niedrist, G. H., Noss, C., Nydahl, A. C., Pansch, N., Amandine Pastor, Pegg, J., Pilotto, F., Portela, A. P., Gonzalez Quijano, C. R., Romero, F., Rulik, M., Danny Sheath, Simov, N., Timoner, X., Bodmer, P., LIMNOLOGY DEPARTMENT OF ECOLOGY AND GENETICS UPPSALA UNIVERSITY SWE, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), WASSERCLUSTER LUNZ AUSTRIA, Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences (SLU), INSTITUTE OF AQUATIC ECOLOGY UNIVERSITY OF GIRONA ESP, DEPARTMENT OF LIFE AND ENVIRONMENTAL SCIENCES BOURNEMOUTH UNIVERSITY FERN BARROW POOLE DORSET GBR, Department of Ecology and Environmental Sciences [Univ Palacký], Faculty of Science [Univ Palacký], Palacky University Olomouc-Palacky University Olomouc, RESOURCES AND ECOSYSTEMS CATALAN INSTITUTE FOR WATER RESEARCH GIRONA ESP, RiverLy (UR Riverly), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), MARINE INSTITUTE FURNACE NEWPORT CO MAYO IRELAND GBR, DEPARTMENT OF ECOLOGY AND ENVIRONMENTAL SCIENCE UMEA UNIVERSITY SWE, Department of Life Sciences and Systems Biology [University of Turin], University of Turin, CENTRE FOR FRESHWATER AND ENVIRONMENTAL STUDIES DUNDALK INSTITUTE OF TECHNOLOGY CO LOUTH IRELAND GBR, DEPARTMENT OF AQUATIC ECOSYSTEMS INSTITUTE OF BIODIVERSITY AND ECOSYSTEM RESEARCH BULGARIAN ACADEMY OF SCIENCES SOFIA BGR, DEPARTMENT OF SCIENCES AND TECHNOLOGICAL INNOVATION UNIVERSITY OF PIEMONTE ORIENTALE ALESSANDRIA ITALY, EXPERIMENTAL LIMNOLOGY LEIBNIZINSTITUTE OF FRESHWATER ECOLOGY AND INLAND FISHERIES STECHLIN DEU, ECOSYSTEMS AND GLOBAL CHANGE GROUP DEPARTMENT OF PLANT SCIENCES UNIVERSITY OF CAMBRIDGE GBR, ECOHYDROLOGY LEIBNIZ-INSTITUTE OF FRESHWATER ECOLOGY AND INLAND FISHERIES BERLIN DEU, ENVIRONMENTAL RESEARCH INSTITUTE UNIVERSITY OF HIGHLANDS AND ISLANDS THURSO SCOTLAND GBR, DEPARTMENT OF GENERAL AND APPLIED HYDROBIOLOGY SOFIA UNIVERSITY ST. KLIMENT OHRIDSKI BULGARIA, INSTITUTE FOR ENVIRONMENTAL SCIENCES UNIVERSITY OF KOBLENZLANDAU LANDAU DEU, CENTRE FOR ECOLOGY EVOLUTION AND ENVIRONMENTAL CHANGES FACULTY OF SCIENCES UNIVERSITY OF LISBON PRT, DEPARTMENT OF EVOLUTIONARY BIOLOGY ECOLOGY AND ENVIRONMENTAL SCIENCES FACULTY OF BIOLOGY UNIVERSITY OF BARCELONA ESP, MICROBIAL RESOURCE MANAGEMENT INSTITUTE OF MICROBIOLOGY UNIVERSITY OF INNSBRUCK AUT, RIVER ECOLOGY AND CONSERVATION RESEARCH DEPARTMENT OF ECOLOGY UNIVERSITY OF INNSBRUCK, AUSTRIA, RESEARCH CENTER IN BIODIVERSITY AND GENETIC RESOURCES FACULTY OF SCIENCES UNIVERSITY OF PORTO PRT, INSTITUTE OF GLOBAL HEALTH FACULTY OF MEDICINE UNIVERSITY OF GENEVA CHE, NATIONAL MUSEUM OF NATURAL HISTORY SOFIA BGR, and CHEMICAL ANALYTICS AND BIOGEOCHEMISTRY LEIBNIZINSTITUTE OF FRESHWATER ECOLOGY AND INLAND FISHERIES BERLIN DEU

Subjects
[SDE]Environmental Sciences
Abstract

International audience; Globally, streams represent major CO2 emitters, accounting for approximately 70% of the total flux from inland waters. Hence, a proper understanding of carbon dioxide (CO2) uptake and emissions from streams is crucial for accurately estimating aquatic global carbon emissions. However, diurnal dynamics of these fluxes are still not comprehensively quantified, contributing to a high uncertainty in regional and global carbon budgets. Within the EuroRun project, the 1st Collaborative European Freshwater Science Project for Young Researchers, we aimed to assess spatial and seasonal variability of day- and night-time CO2 fluxes of 34 streams across 11 European countries. CO2 fluxes were measured with drifting flux chambers once per season at midday and midnight. The median CO2 fluxes during the day amounted to 1.4 µmol m-2 h-1 (IQR 0.5 to 3.1) and during the night to 2.1 µmol m-2 h-1 (IQR 0.95 to 3.75). The CO2 fluxes during night exceeded those during day by up to eight times. Interestingly, these differences occurred throughout all seasons and showed no latitudinal patterns. Our results highlight the importance of night-time fluxes to accurately assess CO2 fluxes from streams. As most studies are performed during the day, our survey indicates that global carbon budgets are currently underestimating the amount of CO2 released by streams.

Published
2019

2. Distribution and abundance of methagenic and methatrophic microorganisms across European streams

Author

Nagler, M., Praeg, N., Niedrist, G., Attermeyer, K., Bednarik, A., Bors, C., Catalan, N., sophie Cauvy-Fraunié, Colls, M., Eyto, E., Doyle, B., Evtimova, V., Fenoglio, S., Freixa, A., Fuss, T., Gaffney, P., Gilbert, P., Gutmann Roberts, C., Herrero Ortega, S., Kenderov, L., Klaus, M., Lamonica, D., Machalett, B., Mor, J. R., Nydahl, A., Pegg, J., Piano, E., Pilotto, F., Romero, F., Romero Gonzalez Quijano, C., Rulik, M., Steinle, L., Thuile Bistarelli, L., Bodmer, P., UNIVERSITAT INNSBRUCK AUT, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), WASSERCLUSTER LUNZ LUNZ AM SEE AUT, Palacky University Olomouc, UNIVERSITY OF KOBLENZLANDAU LANDAU IN DER PFALZ DEU, CATALAN INSTITUTE FOR WATER RESEACH GIRONA ESP, RiverLy (UR Riverly), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), THE MARINE INSTITUTE NEWPORT IRL, DUNDALK INSTITUTE OF TECHNOLOGY DUNDALK IRL, BULGARIAN ACADEMY OF SCIENCES SOFIA BGR, UNIVERSITA DEL PIEMONTE ORIENTALE ALESSANDRIA ITA, LEIBNIZ INSTITUTE OF FRESHWATER ECOLOGY AND INLAND FISHERIES BERLIN DEU, University of the Highlands and Islands (UHI), Bournemouth University [Poole] (BU), SOFIA UNIVERSITY ST KLIMENT OHRIDSKI BGR, UMEA UNIVERSITY SWE, Humboldt-Universität zu Berlin, University of Massachusetts [Amherst] (UMass Amherst), University of Massachusetts System (UMASS), Uppsala University, SOUTH AFRICAN INSTITUTE FOR AQUATIC BIODIVERSITY MAKHANDA ZAF, SENCKENBERG RESEARCH INSTITUTE AND NATURAL HISTORY MUSEUM FRANKFURT GELNHAUSEN DEU, and University of Basel (Unibas)

Subjects
EUROPE, [SDE]Environmental Sciences
Abstract

International audience; Globally, streams and rivers emit a significant amount of methane, a highly potent greenhouse gas. However, little is known about stream sediment microbial communities, driving the net methane balance in these systems, especially on their distribution and composition at large spatial scales. Within the project Euro Methane we investigated the diversity and abundance of methanogenic archaea and methane-oxidizing bacteria across 16 European streams (from northern Spain to central Sweden) via 16S rRNA sequencing and qPCR. We determined environmental drivers of both abundance and community composition and explored the link to measured potential methane production and oxidation rates of the respective sediments. We found that the community composition of methane-oxidizing bacteria significantly differed among the studied streams, while methanogenic archaea were more homogeneously distributed. Beyond the overall diversity trends, indicator species for stream types were identified. Methanogenic Methanosaeta sp. and methane-oxidizing Methyloglobulus sp. increased with geographical latitude and dominated in headwater streams (orders 1-3) with high oxygen levels and high proportions of pristine land within the catchment, while methanogenic Methanomethylovorans sp. and methane-oxidizing Methylocaldum spp. were more common in larger streams (orders 4-6) with higher discharge and agricultural influence. Potential methane production rates significantly increased with abundance of methanogenic archaea, while potential methane oxidation rates did not show significant correlations with methane oxidizing bacteria, presumably due to the more diverse physiological capabilities of this microbial group. Our study represents a holistic large-scale biogeographical overview of two microbial groups to enhance our understanding of the methane cycle within a heretofore understudied ecosystem.

Published
2019

4. Carbon dioxide fluxes increase from day to night across European streams

Author

Attermeyer, K., Casas-Ruiz, J.P., Fuss, T., Pastor, A., Cauvy-Fraunié, S., Sheath, D., Nydahl, A.C., Doretto, A., Portela, A.P., Doyle, B.C., Simov, N., Roberts, C.G., Niedrist, G.H., Timoner, X., Evtimova, V., Barral-Fraga, L., Basic, T., Audet, J., Deininger, A., Busst, G., Fenoglio, S., Catalán, N., de Eyto, E., Pilotto, F., Mor, J-R., Monteiro, J., Fletcher, D., Noss, C., Colls, M., Nagler, M., Liu, L., González-Quijano, C.R., Romero, F., Pansch, N., Ledesma, J.L.J., Pegg, Josie, Klaus, M., Freixa, A., Ortega, S.H., Mendoza-Lera, C., Bednařík, A., Fonvielle, J.A., Gilbert, P.J., Kenderov, L.A., Rulík, M., Bodmer, P., Attermeyer, K., Casas-Ruiz, J.P., Fuss, T., Pastor, A., Cauvy-Fraunié, S., Sheath, D., Nydahl, A.C., Doretto, A., Portela, A.P., Doyle, B.C., Simov, N., Roberts, C.G., Niedrist, G.H., Timoner, X., Evtimova, V., Barral-Fraga, L., Basic, T., Audet, J., Deininger, A., Busst, G., Fenoglio, S., Catalán, N., de Eyto, E., Pilotto, F., Mor, J-R., Monteiro, J., Fletcher, D., Noss, C., Colls, M., Nagler, M., Liu, L., González-Quijano, C.R., Romero, F., Pansch, N., Ledesma, J.L.J., Pegg, Josie, Klaus, M., Freixa, A., Ortega, S.H., Mendoza-Lera, C., Bednařík, A., Fonvielle, J.A., Gilbert, P.J., Kenderov, L.A., Rulík, M., and Bodmer, P.

Abstract

Globally, inland waters emit over 2 Pg of carbon per year as carbon dioxide, of which the majority originates from streams and rivers. Despite the global significance of fluvial carbon dioxide emissions, little is known about their diel dynamics. Here we present a large-scale assessment of day- and night-time carbon dioxide fluxes at the water-air interface across 34 European streams. We directly measured fluxes four times between October 2016 and July 2017 using drifting chambers. Median fluxes are 1.4 and 2.1 mmol m−2 h−1 at midday and midnight, respectively, with night fluxes exceeding those during the day by 39%. We attribute diel carbon dioxide flux variability mainly to changes in the water partial pressure of carbon dioxide. However, no consistent drivers could be identified across sites. Our findings highlight widespread day-night changes in fluvial carbon dioxide fluxes and suggest that the time of day greatly influences measured carbon dioxide fluxes across European streams.

5. The interplay between total mercury, methylmercury and dissolved organic matter in fluvial systems: A latitudinal study across Europe.

Author

Bravo, A.G., Kothawala, D.N., Attermeyer, K., Tessier, E., Bodmer, P., Ledesma, J.L.J., Audet, J., Casas-Ruiz, J.P., Catalán, N., Cauvy-Fraunié, S., Colls, M., Deininger, A., Evtimova, V.V., Fonvielle, J.A., Fuß, T., Gilbert, P., Herrero Ortega, S., Liu, L., Mendoza-Lera, C., Monteiro, J., Mor, J-R., Nagler, M., Niedrist, G.H., Nydahl, A.C., Pastor, A., Pegg, Josie, Gutmann Roberts, Catherine, Pilotto, F., Portela, A.P., González-Quijano, C.R., Romero, F., Rulík, M., Amouroux, D., Bravo, A.G., Kothawala, D.N., Attermeyer, K., Tessier, E., Bodmer, P., Ledesma, J.L.J., Audet, J., Casas-Ruiz, J.P., Catalán, N., Cauvy-Fraunié, S., Colls, M., Deininger, A., Evtimova, V.V., Fonvielle, J.A., Fuß, T., Gilbert, P., Herrero Ortega, S., Liu, L., Mendoza-Lera, C., Monteiro, J., Mor, J-R., Nagler, M., Niedrist, G.H., Nydahl, A.C., Pastor, A., Pegg, Josie, Gutmann Roberts, Catherine, Pilotto, F., Portela, A.P., González-Quijano, C.R., Romero, F., Rulík, M., and Amouroux, D.

Abstract

Large-scale studies are needed to identify the drivers of total mercury (THg) and monomethyl-mercury (MeHg) concentrations in aquatic ecosystems. Studies attempting to link dissolved organic matter (DOM) to levels of THg or MeHg are few and geographically constrained. Additionally, stream and river systems have been understudied as compared to lakes. Hence, the aim of this study was to examine the influence of DOM concentration and composition, morphological descriptors, land uses and water chemistry on THg and MeHg concentrations and the percentage of THg as MeHg (%MeHg) in 29 streams across Europe spanning from 41°N to 64 °N. THg concentrations (0.06-2.78 ng L-1) were highest in streams characterized by DOM with a high terrestrial soil signature and low nutrient content. MeHg concentrations (7.8-159 pg L-1) varied non-systematically across systems. Relationships between DOM bulk characteristics and THg and MeHg suggest that while soil derived DOM inputs control THg concentrations, autochthonous DOM (aquatically produced) and the availability of electron acceptors for Hg methylating microorganisms (e.g. sulfate) drive %MeHg and potentially MeHg concentration. Overall, these results highlight the large spatial variability in THg and MeHg concentrations at the European scale, and underscore the importance of DOM composition on mercury cycling in fluvial systems.

7. Balancing the health benefits and environmental risks of pharmaceuticals: Diclofenac as an example.

Author

Acuña V, Ginebreda A, Mor JR, Petrovic M, Sabater S, Sumpter J, and Barceló D

Subjects
Animals, Anti-Inflammatory Agents, Non-Steroidal toxicity, Diclofenac toxicity, Ecosystem, Humans, No-Observed-Adverse-Effect Level, Risk, Water Pollutants, Chemical toxicity, Anti-Inflammatory Agents, Non-Steroidal analysis, Diclofenac analysis, Drug Utilization statistics & numerical data, Environmental Policy, Fresh Water analysis, Water Pollutants, Chemical analysis
Abstract

Pharmaceuticals are designed to improve human and animal health, but even the most beneficial pharmaceuticals might raise some questions concerning the consequences of exposure to non-target organisms. To illustrate this situation and using diclofenac as a case-study, we analyze global consumption and occurrence data to identify hot spots of consumption without occurrence data, review the scientific literature on the harmful environmental effects to determine whether the observed concentrations in freshwater are of environmental concern, summarize the current pharmaceutical and environmental policies to highlight policy gaps, and suggest a series of research and policy recommendations, which can be summarized as follows: we need to improve the current knowledge on occurrence in freshwaters to properly implement environmental policies (i), diclofenac might pose a risk to non-target organisms in freshwater (ii); the harmful effects that some pharmaceuticals may have on the environment are not always addressed by environmental policies (iii)., (Copyright © 2015 Elsevier Ltd. All rights reserved.)

Published
2015
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9. Rapid sampling of yeast cells and automated assays of adenylate, citrate, pyruvate and glucose-6-phosphate pools.

Author

Weibel KE, Mor JR, and Fiechter A

Subjects
Aconitic Acid metabolism, Adenosine Diphosphate metabolism, Adenosine Monophosphate metabolism, Adenosine Triphosphate metabolism, Autoanalysis, Cell-Free System, Evaluation Studies as Topic, Freezing, Hydrogen-Ion Concentration, Indicators and Reagents, Methods, NAD, Oxidation-Reduction, Perchlorates, Time Factors, Adenine Nucleotides metabolism, Citrates metabolism, Glucosephosphates metabolism, Pyruvates metabolism, Saccharomyces cerevisiae metabolism
Published
1974
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11. On the activity of carbon dioxide fixation in growing yeasts.

Author

Divjak S and Mor JR

Subjects
Aerobiosis, Candida enzymology, Candida metabolism, Gluconeogenesis, Glycolysis, Mitosporic Fungi enzymology, Phosphoenolpyruvate Carboxykinase (GTP) metabolism, Pyruvate Carboxylase metabolism, Saccharomyces cerevisiae enzymology, Saccharomyces cerevisiae metabolism, Carbon Dioxide metabolism, Mitosporic Fungi metabolism
Published
1973
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