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3 results on '"Universidad de Concepción - University of Concepcion [Chile]"'

1. Niche breadth affects bacterial transcription patterns along a salinity gradient

Author

Angel Rain‐Franco, Nicolas Mouquet, Claire Gougat‐Barbera, Thierry Bouvier, Sara Beier, Universidad de Concepción - University of Concepcion [Chile], Laboratoire d'Océanographie Microbienne (LOMIC), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), MARine Biodiversity Exploitation and Conservation (UMR MARBEC), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), and Leibniz Institute for Baltic Sea Research Warnemünde (IOW)

Subjects
Acclimatization, [SDE.MCG]Environmental Sciences/Global Changes, specialists, microbial communities, generalists, diversity, salinity, 03 medical and health sciences, evolution, Genetics, microorganisms, Ecosystem, Ecology, Evolution, Behavior and Systematics, 030304 developmental biology, biodiversity, 0303 health sciences, mechanisms, metatranscriptomics, Bacteria, 030306 microbiology, stress response, Adaptation, Physiological, gene-expression, stress marker genes, plasticity, climate-change, niche width, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, transcriptome
Abstract

WOS:000733372500001; International audience; Understanding the molecular mechanisms that determine a species' life history is important for predicting their susceptibility to environmental change. While specialist species with a narrow niche breadth (NB) maximize their fitness in their optimum habitat, generalists with broad NB adapt to multiple environments. The main objective of this study was to identify general transcriptional patterns that would distinguish bacterial strains characterized by contrasted NBs along a salinity gradient. More specifically, we hypothesized that genes encoding fitness-related traits, such as biomass production, have a higher degree of transcriptional regulation in specialists than in generalists, because the fitness of specialists is more variable under environmental change. By contrast, we expected that generalists would exhibit enhanced transcriptional regulation of genes encoding traits that protect them against cellular damage. To test these hypotheses, we assessed the transcriptional regulation of fitness-related and adaptation-related genes of 11 bacterial strains in relation to their NB and stress exposure under changing salinity conditions. The results suggested that transcriptional regulation levels of fitness- and adaptation-related genes correlated with the NB and/or the stress exposure of the inspected strains. We further identified a shortlist of candidate stress marker genes that could be used in future studies to monitor the susceptibility of bacterial populations or communities to environmental changes.

Published
2022
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2. Models and methods for frequency assignment with cumulative interference constraints

Author

Christian Artigues, Cristian Oliva, Mireille Palpant, Philippe Michelon, Mohamed Didi Biha, Amadeus, Departamento de Ingeneria Industrial (DII), Universidad de Concepción - University of Concepcion [Chile], LAAS-MOGISA, Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Laboratoire Informatique d'Avignon (LIA), Avignon Université (AU)-Centre d'Enseignement et de Recherche en Informatique - CERI, Laboratoire d'Analyse non linéaire et Géométrie (LANLG), Avignon Université (AU), Universidad de Concepción [Chile], Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), and Centre d'Enseignement et de Recherche en Informatique - CERI-Avignon Université (AU)

Subjects
large neighborhood search, constraint programming, Mathematical optimization, Linear programming, Strategy and Management, Frequency assignment, 0211 other engineering and technologies, cumulative interference constraints, 02 engineering and technology, Management Science and Operations Research, Interference (wave propagation), 0203 mechanical engineering, Management of Technology and Innovation, Constraint programming, Business and International Management, Integer programming, Mathematics, 021103 operations research, linear programming, 020302 automobile design & engineering, [INFO.INFO-RO]Computer Science [cs]/Operations Research [cs.RO], Constraint satisfaction, Computer Science Applications, Constraint (information theory), frequency assignment, Heuristics, Algorithm
Abstract

18 pages; International audience; In this paper, a realistic modeling of interferences for frequency assignment in hertzian telecommunication networks is presented. In contrast with traditional interference models based only on binary interference constraints involving two frequencies, this new approach considers the case of cumulative disruptions that are modeled through a unique non-binary constraint. To deal with these complex constraints, we propose extensions of classical integer linear programming formulations. On a set of realistic instances, we propose hybrid constraint programming and large neighborhood search solution methods to solve minimum interference and minimum span frequency assignment problems. We compare their performances with those of existing heuristics. Finally, we show how the end-user benefits from using the cumulative model instead of the traditional one.

Published
2008
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3. A global experiment suggests climate warming will not accelerate litter decomposition in streams but might reduce carbon sequestration

Author

Boyero, Luz, Pearson, Richard G., Gessner, Mark O., Barmuta, Leon A., Ferreira, Verónica, Graça, Manuel A. S., Dudgeon, David, Boulton, Andrew J., Callisto, Marcos, Chauvet, Eric, Helson, Julie E., Bruder, Andreas, Albariño, Ricardo J., Yule, Catherine M., Arunachalam, Muthukumarasamy, Davies, Judy N., Figueroa, Ricardo, Flecker, Alexander S., Ramírez, Alonso, Death, Russell G., Iwata, Tomoya, Mathooko, Jude M., Mathuriau, Catherine, Gonçalves, José F. Jr, Moretti, Marcelo S., Jinggut, Tajang, Lamothe, Sylvain, M'Erimba, Charles, Ratnarajah, Lavenia, Schindler, Markus, Castela, José, Buria, Leonardo M., Cornejo, Aydeé, Villanueva, Verónica Díaz, West, Derek C., Centre National de la Recherche Scientifique - CNRS (FRANCE), Consejo Superior de Investigaciones Científicas - CSIC (SPAIN), Universidade de Coimbra (PORTUGAL), Cornell University (USA), University of Hong Kong - HKU (CHINA), Instituto Conmemorativo Gorgas de Estudios de la Salud - ICGES (PANAMA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), James Cook University - JCU (AUSTRALIA), Massey University (NEW ZEALAND), Monash University (MALAYSIA), Universidad de Concepción - UDEC (CHILE), Universidad Nacional Autónoma de México - UNAM (MEXICO), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), University of Toronto (CANADA), University of Yamanashi (JAPAN), Swiss Federal Institute of Aquatic Science and Technology - EAWAG (SWITZERLAND), Egerton university (KENYA), Manonmaniam Sundaranar university (INDIA), Eidgenössische Technische Hochschule Zürich - ETHZ (SWITZERLAND), Universidade Federal de Minas Gerais - UFMG (BRAZIL), Universidad Nacional del Comahue (ARGENTINA), University of New England - UNE (AUSTRALIA), Universidad de Panamà (PANAMA), Universidad de Puerto Rico - UPR (PUERTO RICO), University of Tasmania (AUSTRALIA), Laboratorio de Ecologia de Bentos (Belo Horizonte, Brazil), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), James Cook University (JCU), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf] (EAWAG), University of Tasmania [Hobart, Australia] (UTAS), Universidade de Coimbra [Coimbra], The University of Hong Kong (HKU), University of New England (UNE), Laboratorio de ecologia de Bentos (Belo Horizonte, Brazil), Universidade Federal de Minas Gerais [Belo Horizonte] (UFMG), Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), University of Toronto, Laboratorio de Limnología [Bariloche], 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)-Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional del Comahue [Neuquén] (UNCOMA), Monash University [Malaysia], Universidad de Concepción - University of Concepcion [Chile], Cornell University [New York], University of Puerto Rico (UPR), Massey University, Yamanashi University, Egerton University, Universidad de Panamá, Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)

Subjects
Ecologie, Environnement, Carbon Sequestration, Litter decomposition, Temperature, Fresh Water, Carbon cycle, Carbon Dioxide, Plants, Latitudinal gradient, Plant Leaves, Streams, Climate change, Detritivores, Microbial decomposers, [SDV.EE.BIO]Life Sciences [q-bio]/Ecology, environment/Bioclimatology, Ecosystem, Global analysis
Abstract

International audience; The decomposition of plant litter is one of the most important ecosystem processes in the biosphere and is particularly sensitive to climate warming. Aquatic ecosystems are well suited to studying warming effects on decomposition because the otherwise confounding influence of moisture is constant. By using a latitudinal temperature gradient in an unprecedented global experiment in streams, we found that climate warming will likely hasten microbial litter decomposition and produce an equivalent decline in detritivore-mediated decomposition rates. As a result, overall decomposition rates should remain unchanged. Nevertheless, the process would be profoundly altered, because the shift in importance from detritivores to microbes in warm climates would likely increase CO2 production and decrease the generation and sequestration of recalcitrant organic particles. In view of recent estimates showing that inland waters are a significant component of the global carbon cycle, this implies consequences for global biogeochemistry and a possible positive climate feedback.

Published
2011
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