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| Registros recuperados: 37 | |
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| Bennett, Elena M.; Department of Natural Resource Sciences and McGill School of Environment, McGill University; elena.bennett@mcgill.ca. |
| Managing human-dominated landscapes such as agroecosystems is one of the main challenges facing society today. Decisions about land-use management in agroecosystems involve spatial and temporal trade-offs. The key scales at which these trades-offs occur are poorly understood for most systems, and quantitative assessments of the services provided by agroecosystems under different combinations of land uses are rare. To fill these knowledge gaps, we measured 12 ecosystem services (ES), including climate regulation, gas regulation, soil stability, nutrient regulation, habitat quality, raw material production, food production, fishing, sports, recreation, education, and social relationships, in seven common land-use types at three spatial scales, i.e., patch,... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Agroecosystem; Ecosystem services; Floodplain; Interactions; Land uses; Spatial scales; Trade-offs. |
| Ano: 2014 |
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| Agogue, Helene; Mallet, Clarisse; Orvain, Francis; De Crignis, Margot; Mornet, Francoise; Dupuy, Christine. |
| In intertidal mudflats, during low tide exposure, microphytobenthos (MPB) migrate vertically through the surface sediment and form, with the heterotrophic bacteria, a transient biofilm. Inside this biofilm, multiple interactions exist between MPB and bacteria. These micro-organisms secrete a wide range of extracellular polymeric substances (EPS), which are major components of the biofilm matrix. In this study, we used a tidal mesocosm experiment in order to decipher the interactions of the MPB-EPS-bacteria complex within the biofilm. We tried to determine if the EPS could control bacterial activities and/or production and/or richness according to the age of the biofilm and to the immersion/emersion period. The dynamics of biomasses of MPB and prokaryotes,... |
| Tipo: Text |
Palavras-chave: Muddy sediment; Microphytobenthos; Bacteria; Extracellular polymeric substances; Interactions; Mesocosm. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00181/29271/27682.pdf |
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| Segarra, Amelie; Mauduit, Florian; Faury, Nicole; Trancart, Suzanne; Degremont, Lionel; Tourbiez, Delphine; Haffner, Philippe; Barbosa-solomieu, Valerie; Pepin, Jean-francois; Travers, Marie-agnes; Renault, Tristan. |
| Background: Massive mortality outbreaks affecting Pacific oyster (Crassostrea gigas) spat in various countries have been associated with the detection of a herpesvirus called ostreid herpesvirus type 1 (OsHV-1). However, few studies have been performed to understand and follow viral gene expression, as it has been done in vertebrate herpesviruses. In this work, experimental infection trials of C. gigas spat with OsHV-1 were conducted in order to test the susceptibility of several bi-parental oyster families to this virus and to analyze host-pathogen interactions using in vivo transcriptomic approaches. Results: The divergent response of these oyster families in terms of mortality confirmed that susceptibility to OsHV-1 infection has a significant... |
| Tipo: Text |
Palavras-chave: Interactions; Ostreid herpesvirus 1; Gene expression; Susceptibility; Crassostrea gigas. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00199/31029/29431.pdf |
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| Le Chevanton, Myriam; Garnier, Matthieu; Lukomska, Ewa; Schreiber, Nathalie; Cadoret, Jean-paul; Saint-jean, Bruno; Bougaran, Gael. |
| Interactions between photosynthetic and non-photosynthetic microorganisms play an essential role in natural aquatic environments and the contribution of bacteria and microalgae to the nitrogen cycle can lead to both competitive and mutualistic relationships. Nitrogen is considered to be, with phosphorus and iron, one of the main limiting nutrients for primary production in the oceans and its availability experiences large temporal and geographical variations. For these reasons, it is important to understand how competitive and mutualistic interactions between photosynthetic and heterotrophic microorganisms are impacted by nitrogen limitation. In a previous study performed in batch cultures, the addition of a selected bacterial strain of Alteromonas sp.... |
| Tipo: Text |
Palavras-chave: Interactions; Nitrogen limitation; Microalgae; Bacteria; Chemostat; Dissolved organic matter (DOM); Dunaliella. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00344/45529/45087.pdf |
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| Jauzein, Cecile; Couet, Douglas; Blasco, Thierry; Lemee, Rodolphe. |
| Environmental factors that shape dynamics of benthic toxic blooms are largely unknown. In particular, for the toxic dinoflagellate Ostreopsis cf. ovata, the importance of the availability of nutrients and the contribution of the inorganic and organic pools to growth need to be quantified in marine coastal environments. The present study aimed at characterizing N-uptake of dissolved inorganic and organic sources by O. cf. ovata cells, using the 15N-labelling technique. Experiments were conducted taking into account potential interactions between nutrient uptake systems as well as variations with the diel cycle. Uptake abilities of O. cf. ovata were parameterized for ammonium (NH4+), nitrate (NO3−) and N-urea, from the estimation of kinetic and inhibition... |
| Tipo: Text |
Palavras-chave: Uptake; Nitrogen; Dinoflagellate; Ostreopsis; Kinetics; Interactions. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00382/49368/49840.pdf |
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| Castrec, Benoit. |
| DNA replication is a functionally conserved mechanism among the three domains of life. This processus is performed by DNA polymerases with two accessories factors, PCNA and RF-C, sliding clamp and clamp loader, respectively. Our model of study, the Euryarchaeota Pyrococcus abyssi, possesses one monomeric DNA polymerase, belonging to the Family B, and one heterodimeric DNA polymerase, belonging to the Family D. Usually, proteins interact with PCNA at a hydrophobic pocket which is formed by the IDCL (interdomain connecting loop) and the C-terminus. These interactions are mediated through common motifs like the PIP box (motif PCNA interacting Protein). We have demonstrated that Pol B has just one PIP box motif at the C-terminus, while Pol D has two PIP-type... |
| Tipo: Text |
Palavras-chave: Thermostability; Interactions; Motifs; DNA replication; RF C; PCNA; DNA polymerases; Archaea; Thermostabilité; Interactions; Motifs; Réplication de l'ADN; RF C; PCNA; ADN polymérases; Archaea. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/these-6940.pdf |
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| Leprêtre, Maxime; Faury, Nicole; Segarra, Amelie; Claverol, Stéphane; Degremont, Lionel; Palos-ladeiro, Mélissa; Armengaud, Jean; Renault, Tristan; Morga, Benjamin. |
| Massive mortality outbreaks affecting Pacific oysters (Crassostrea gigas) spat/juveniles are often associated with the detection of a herpesvirus called ostreid herpesvirus type 1 (OsHV-1). In this work, experimental infection trials of C. gigas spat with OsHV-1 were conducted using two contrasted Pacific oyster families for their susceptibility to viral infection. Live oysters were sampled at 12, 26, and 144 h post infection (hpi) to analyze host-pathogen interactions using comparative proteomics. Shotgun proteomics allowed the detection of seven viral proteins in infected oysters, some of them with potential immunomodulatoy functions. Viral proteins were mainly detected in susceptible oysters sampled at 26 hpi, which correlates with the mortality and... |
| Tipo: Text |
Palavras-chave: Proteomics; Interactions; Antiviral response; OsHV-1; Pacific oysters. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00669/78075/80307.pdf |
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| Barraquand, F.; Picoche, C.; Maurer, Daniele; Carassou, L.; Auby, Isabelle. |
| Phytoplanktonic communities maintain a high diversity in a seemingly homogeneous environment, competing for the same set of resources. Many theories have been proposed to explain this coexistence despite likely competition, such as contrasted responses to temporal environmental variation. However, theory has developed at a faster pace than empirical evaluation using field data, which requires inferring drivers of community dynamics from observational time series. Here, we combine autoregressive models with a data set spanning more than 20 years of phytoplankton counts every two weeks, together with nutrients and physical variables. By comparing models dominated by nutrients or physical variables (hydrodynamics and climate), we first explore which abiotic... |
| Tipo: Text |
Palavras-chave: Competition; Diatoms; Dinoflagellates; Hydrodynamics; Interactions; MAR; Mutualism; Network; Population dynamics; Seasonality; Time series. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00461/57257/59285.pdf |
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| Le Roux, Frederique; Wegner, K. Mathias; Baker-austin, Craig; Vezzulli, Luigi; Osorio, Carlos R.; Amaro, Carmen; Ritchie, Jennifer M.; Defoirdt, Tom; Destoumieux-garzon, Delphine; Blokesch, Melanie; Mazel, Didier; Jacq, Annick; Cava, Felipe; Gram, Lone; Wendling, Carolin C.; Strauch, Eckhard; Kirschner, Alexander; Huehn, Stephan. |
| Global change has caused a worldwide increase in reports of Vibrio-associated diseases with ecosystem-wide impacts on humans and marine animals. In Europe, higher prevalence of human infections followed regional climatic trends with outbreaks occurring during episodes of unusually warm weather. Similar patterns were also observed in Vibrio-associated diseases affecting marine organisms such as fish, bivalves and corals. Basic knowledge is still lacking on the ecology and evolutionary biology of these bacteria as well as on their virulence mechanisms. Current limitations in experimental systems to study infection and the lack of diagnostic tools still prevent a better understanding of Vibrio emergence. A major challenge is to foster cooperation between... |
| Tipo: Text |
Palavras-chave: Global warming; Human health; Aquaculture; Interactions; Animal model; Bacterial disease; Genome plasticity; European network. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00278/38952/37494.pdf |
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| Caurant, Florence; Amiard, Jean-claude; Amiard-triquet, Claude; Sauriau, Pierre-guy. |
| Trace elements (As, Cd, Cu, Hg, Se and Zn) were determined in liver and kidney of pilot whales Globicephala melas Traill, 1809 collected from 7 schools caught at different seasons around the Faroe Islands. These and other biological data at our disposal enabled us to confirm and to define more accurately the relations shown previously between age, sex and trace element concentrations in marine mammals. The most striking features were: (1) the elevated levels of Cd and Hg in pilot whales compared to other marine mammals and to minimum adverse-effect levels established for humans; (2) the biocumulative behaviour of Cd and Hg; (3) the high correlations between Hg and Se, predominantly influenced by age; and (4) the high correlations between Cd and Zn, the... |
| Tipo: Text |
Palavras-chave: Marine mammals; Heavy metals; Interactions. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00196/30766/29149.pdf |
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| Le Chevanton, Myriam. |
| The use of algae-bacteria mixed culture has been suggested to improve performance of industrial microalgae culture. The present study aims to investigate impact of selected bacteria on Dunaliella sp. growth. 97 bacteria strains were isolated from a variety of marine microalgae cultures. The diversity of strains revealed members of α-and γ-proteobacteria, Cytophaga-Flavobacterium-Bacteroides and grampositive. A two-phase approach was then implemented to select bacteria that improve Dunaliella sp. growth, using an original high-throughput experimental device. Although a majority of bacteria induced performance reduction for Dunaliella sp., some resulted in significant improvements. In nitrogenlimited batch culture, the Alteromonas sp. bacteria demonstrated a... |
| Tipo: Text |
Palavras-chave: Interactions; Microalgues; Bactéries; Dunaliella; Axénie; Interactions; Microalgae; Bacteria; Dunaliella; Axenic. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00187/29839/28291.pdf |
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| Boude, Jp; Lesueur, M; Daures, Fabienne; Guyader, Olivier; Drouot, Bruno. |
| Leisure fishing, open to everyone and without a license, is a leisure activity in which many people are interested. Conversely to other harvesting activities such as fresh water fishing and hunting, it has practically not been studied until now (Appéré et Bonnieux, 2002). This study, dedicated to practice of leisure fishing at sea in the Gulf of Morbihan, set itself several objectives: - collect and assemble the available knowledge on regulations and practice of maritime leisure fishing - assess the amount of harvesting of certain recreational types of fishing and the economic impact generated by this activity, - highlight the problems of existing or potential cohabitations among the various users of the space and resources in the Gulf. - develop an... |
| Tipo: Text |
Palavras-chave: Economic evaluation; Shellfish; Clams; Morbihan bay; Brittany; Leisure fishing; Cout de transport; Palourdes; Interactions; Conflits d'usage; Evaluation economique; Impact sur la ressource; Reglementation; Peche en bateau; Peche de plaisance; Peche à pied; Peche de loisir; Activités de peche; Golfe du morbihan. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/rapport-2244.pdf |
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| Jauzein, Cecile; Loureiro, Sofia; Garces, Esther; Collos, Yves. |
| Short-term experiments were carried out to investigate whether interactions between ammonium (NH4+) and urea uptake regulate the total nitrogen assimilation of the toxic dinoflagellate Alexandrium catenella. To test for strain variability, 5 strains of A. catenella from the NW Mediterranean were used: 3 strains from the Thau lagoon (southern France) and 2 strains from the Catalonia basin (Spain). For each strain, the uptake rate of 1 nutrient (NH4+ or urea) at a reference concentration (10 mu gatN l(-1)) was measured as a function of the increasing concentration of the other nutrient (0 to 10 mu gatN l(-1)). Simultaneous N uptake rates of the distinct nitrogen sources were obtained from N-15-NH4+ and N-15-urea incorporation measurements. A strong... |
| Tipo: Text |
Palavras-chave: Strain variability; Interactions; Urea; Ammonium; Alexandrium catenella. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6432.pdf |
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| Coquille, Nathalie; Menard, Dominique; Rouxel, Julien; Dupraz, Valentin; Eon, Melissa; Pardon, Patrick; Budzinski, Helene; Morin, Soizic; Parlanti, Edith; Stachowski-haberkorn, Sabine. |
| Microalgae, which are the foundation of aquatic food webs, may be the indirect target of herbicides used for agricultural and urban applications. Microalgae also interact with other compounds from their environment, such as natural dissolved organic matter (DOM), which can itself interact with herbicides. This study aimed to evaluate the influence of natural DOM on the toxicity of three herbicides (diuron, irgarol and S-metolachlor), singly and in ternary mixtures, to two marine microalgae, Chaetoceros calcitrans and Tetraselmis suecica, in monospecific, non-axenic cultures. Effects on growth, photosynthetic efficiency (Ф’M) and relative lipid content were evaluated. The chemical environment (herbicide and nutrient concentrations, dissolved organic carbon... |
| Tipo: Text |
Palavras-chave: Microalgae; Herbicides; Natural dissolved organic matter; DOM; Toxicity; Interactions. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00428/53964/55113.pdf |
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| Chopin, Christine; Kone, Matenin; Serot, Thierry. |
| The aim of this study was to assess the modifications of fish myosin induced by interactions with four aldehydes: hexanal, 2-hexenal, 2,4-hexadienal, and 2,6-nonadienal. These compounds are generated during lipid oxidation and are known to have an impact on the functional properties of proteins. The interactions between protein and aldehydes were highlighted by measuring the content of aldehydes in the gaseous phase by the SPME-GC technique. Results show that the partition of aldehydes between the proteinaceous system and the gas phase decreases with time, except for hexanal. This decrease is proportional to the number of carbons and double bonds. The reaction between myosin and unsaturated aldehydes induces a decrease in the free sulfhydryl and amino... |
| Tipo: Text |
Palavras-chave: SPME; Interactions; Aldehydes; Fish myosin. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2676.pdf |
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| Márquez, J.C.; Díaz, J.M.. |
| Macroalgae proliferation on coral reefs has been a recognized phenomenon for the past two decades and is generally entitled to the human activities on the coasts. Even thought, the role of competition in this process is not clear and it has been assumed that algae are competitively superior to corals, even when it has been demonstrated that this is not always the case. It is probable that the result of coral-macroalgae depends upon the species involved. The goal of this study was to demonstrate that there is a dependence relation between interaction category and interacting species. In order to resolve this, quantifications of interactions per category along 20 m transects were done on three representative localities at the Archipielago de San Bernardo.... |
| Tipo: Journal Contribution |
Palavras-chave: Coral; Interactions; Competition; Benthos; Benthos; Http://aims.fao.org/aos/agrovoc/c_878. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/2013 |
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| Registros recuperados: 37 | |
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