LIttoral ENvironnement et Sociétés (LIENSs) - UMR 7266

LIttoral ENvironnement et Sociétés (LIENSs) - UMR 7266 https://lienss.univ-larochelle.fr/ fr SPIP - www.spip.net LIttoral ENvironnement et Sociétés (LIENSs) - UMR 7266 https://lienss.univ-larochelle.fr/local/cache-vignettes/L81xH81/siteon0-b9b71.png?1737552369 https://lienss.univ-larochelle.fr/ 81 81 Access to the data portal (LIENSs) https://lienss.univ-larochelle.fr/Access-to-the-data-portal-LIENSs-2271 https://lienss.univ-larochelle.fr/Access-to-the-data-portal-LIENSs-2271 2026-02-03T15:15:20Z text/html en Thierry Guyot <p>Accès au portail de données (LIENSs) <br class='autobr' /> Find out more about the LIENSs georeferenced data portal For help with metadata entry and DOI requests, please consult the ODATIS guide.->https://odatis-public.gitlab-pages.ifremer.fr/support/documentation/guideMetadonnees.html] <br class='autobr' /> — ></p> - <a href="https://lienss.univ-larochelle.fr/Data" rel="directory">Data</a> <div class='rss_chapo'><span style="display: inline-block; vertical-align: middle;"> <div class='spip_document_1669 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <a href='https://lienss.univ-larochelle.fr/Acces-au-portail-de-donnees-LIENSs-611' class="spip_in spip_doc_lien"> <img src='https://lienss.univ-larochelle.fr/IMG/png/drapeau_francais2_-_small-2.png' width="35" height="35" alt='' /></a> </figure> </div> </span></div> <div class='rss_texte'><hr> <p> <gn-app url="https://sextant.ifremer.fr/geonetwork" portal="LITTORAL_ENVIRONNEMENT-Geoplateforme17" language="eng" config="lienss"></gn-app></p> <script src="https://sextant.ifremer.fr/geonetwork/catalog/webcomponents/webcomponents.js"></script> <!-- -* [Data Management Support Service->rub609] -* [Access to the data portal (LIENSs)->rub611] -* [Platforms, data catalogs->rub608] -* [Image processing tools->rub612] <html><hr><ul class="spip" role="list"><li> Find out more about <a href='https://lienss.univ-larochelle.fr/Infos-portail-de-donnees' class="spip_in" hreflang="fr">the LIENSs georeferenced data portal</a></li></ul><ul class="spip" role="list"><li> For help with metadata entry and DOI requests, please consult the ODATIS guide.-><a href="https://odatis-public.gitlab-pages.ifremer.fr/support/documentation/guideMetadonnees.html" class="spip_url spip_out auto" rel="nofollow external">https://odatis-public.gitlab-pages.ifremer.fr/support/documentation/guideMetadonnees.html</a>] <br />— ><br class='autobr' /> </html></li></ul></div> benthic meiofauna https://lienss.univ-larochelle.fr/benthic-meiofauna https://lienss.univ-larochelle.fr/benthic-meiofauna 2021-01-04T10:22:36Z text/html fr Thierry Guyot <p>BENTHIC MEIOFAUNA : Meiofauna consist of microscopically small, motile animals (size ranging from 44 to 500 µm) occurring in and on soft substrates of both marine and freshwater ecosystems. They are known for their high abundance within coastal ecosystems. Nematodes generally dominate meiofauna communities in coastal intertidal ecosystems, often followed by benthic copepods as the second most abundant group. Nematodes occur from polar to tropical regions and from sandy beaches to deep-sea (…)</p> - <a href="https://lienss.univ-larochelle.fr/species" rel="directory">species</a> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L150xH150/arton1752-d3a72.png?1737606626' class='spip_logo spip_logo_right' width='150' height='150' alt="" /> <div class='rss_texte'><h3 class="spip">BENTHIC MEIOFAUNA :</h3> <p>Meiofauna consist of microscopically small, motile animals (size ranging from 44 to 500 µm) occurring in and on soft substrates of both marine and freshwater ecosystems. They are known for their high abundance within coastal ecosystems. Nematodes generally dominate meiofauna communities in coastal intertidal ecosystems, often followed by benthic copepods as the second most abundant group. Nematodes occur from polar to tropical regions and from sandy beaches to deep-sea sediments. Their abundance is very high in intertidal soft-bottom coastal ecosystems, however this abundance can be quite variable (10<sup>5</sup> to 10<sup>8</sup> individuals.m<sup>-2</sup>). Benthic copepods typically occur in habitats with medium-to-fine sand, where their abundance can be slightly higher than those of nematodes. Other groups of meiofauna, such as ostracods and polychaetes, are generally less abundant in soft-bottom intertidal habitats.</p> <h3 class="spip">BENTHIC MEIOFAUNA STUDIED IN THE TEAM BIOFEEL :</h3> <p>Researchers from the team BIOFEEL mostly study two major groups of meiofauna : the nematodes, and the benthic copepods. Nematodes are characterized by four major feeding types, which biomass change depending on abiotic and biotic parameters : selective deposit feeders (which mostly rely on bacteria), non-selective deposit feeders, epigrowh feeders (which mostly rely on benthic microalgae, particularly diatoms) and omnivores/carnivores. Species from these different groups can be identified using the shape of their mouth, as this shape is closely related to their feeding behavior. Benthic copepods are generally dominated by harpacticoid and cyclopoid copepods. If nematodes can migrate into the sediment, copepods very mostly occur in the very first mm of the sediment.</p> <h3 class="spip">RESEARCH CARRIED OUT IN THE TEAM BIOFEEL ABOUT BENTHIC MEIOFAUNA :</h3> <p>Determination of the food resources used by nematodes and benthic copepods using trophic markers (stable isotopes, fatty acids). <br class='autobr' /> Determination of community structure of nematode assemblages.</p> <h3 class="spip">RESEARCHERS FROM THE TEAM BIOFEEL WORKING ON BENTHIC MEIOFAUNA :</h3> <p>Christine Dupuy<br class='autobr' /> Denis Fichet<br class='autobr' /> <a href='https://lienss.univ-larochelle.fr/Lebreton-Benoit' class="spip_in" hreflang="en">Benoit Lebreton</a><br class='autobr' /> Luuk van der Heijden</p> <h3 class="spip">REFERENCE PUBLICATIONS :</h3><ul class="spip" role="list"><li> Giere O., 2009. Meiobenthology. The microscopic fauna in aquatic sediments. Springer-Verlag, Berlin, 328 p.</li><li> Heip C., Vincx M., Vranken G., 1985. The ecology of marine nematodes. Oceanography and Marine Biology. An Annual Review 23, 399-489.</li><li> Hicks G.R.F., Coull B.C., 1983. The ecology of marine meiobenthic harpacticoid copepods. Oceanography and Marine Biology. An Annual Review 21, 67-175.</li><li> Moens T., Bergtold M., Traunspurger W., 2006. Feeding ecology of free-living benthic nematodes. In : Freshwater nematodes : ecology and taxonomy. Abebe E., Andrassy I., Traunspurger W. (Eds.), Wallingford & Cambridge, USA, CABI Publishing : 105-131.</li></ul><h3 class="spip">MAJOR PUBLICATIONS OF THE TEAM BIOFEEL :</h3><ul class="spip" role="list"><li> Dupuy C., Nguyen Thanh H., Mizrahi D., Jourde J., Bréret M., Agogué H., Beaugeard L., Bocher P., 2015. Structure and functional characteristics of the meiofauna community in highly unstable intertidal mudbanks in Suriname and French Guiana (North Atlantic coast of South America). Continental Shelf Research 110, 39-47.</li><li> Lebreton B., Richard P., Galois R., Radenac G., Brahmia A., Colli G., Grouazel M., André C., Guillou G., Blanchard G.F., 2012. Food sources used by sediment meiofauna in an intertidal <i>Zostera noltii</i> seagrass bed : a seasonal stable isotope study. Marine Biology 159, 1537-1550.</li><li> Pascal P.-Y., Dupuy C., Richard P., Haubois A.-G., Niquil N., 2008. Influence of environment factors on bacterial ingestion rate of the deposit-feeder Hydrobia ulvae and comparison with meiofauna. Journal of Sea Research 60, 151-156.</li><li> Pascal P.-Y., Dupuy C., Richard P., Mallet C., Armynot du Chatelet E., Niquil N., 2009. Seasonal variation in consumption of benthic bacteria by meio- and macrofauna in an intertidal mudflat. Limnology and Oceanography 54, 1048-1059.</li><li> Rzeznik-Orignac J., Boucher G., Fichet D., Richard P., 2008. Stable isotope analysis of food source and trophic position of intertidal nematodes and copepods. Marine Ecology Progress Series 359, 145-150.</li><li> Rzeznik-Orignac J., Fichet D., Boucher G., 2003. Spatio-temporal structure of the nematode assemblages of the Brouage mudflat (Marennes Oléron, France). Estuarine, Coastal and Shelf Science 58, 77-88.</li><li> Rzeznik-Orignac J., Fichet D., Boucher G., 2004. Extracting massive numbers of nematodes from muddy marine deposits : efficiency and selectivity. Nematology 6, 605-616.</li><li> Van der Heijden L.H., Rzeznik-Orignac J., Asmus R.M., Fichet D., Bréret M., Kadel P., Beaugeard L., Asmus H., Lebreton B., 2018. How do food sources drive meiofauna community structure in soft-bottom coastal food webs ? Marine Biology 165, 166.</li></ul></div> benthic microalgae https://lienss.univ-larochelle.fr/benthic-microalgae https://lienss.univ-larochelle.fr/benthic-microalgae 2021-01-04T10:15:21Z text/html fr Thierry Guyot <p>BENTHIC MICROALGAE : Benthic microalgae are photosynthetic microorganisms growing in the sediment, contrarily to phytoplankton that develop in the water column. The microphytobenthos can consist of diatoms, cyanobacteria, Chlorophyceae and/or flagellates. Among the diatoms, which largely dominate in intertidal mudflats of the Atlantic coasts, two types can be observed : the epipelic diatoms, which are motile, and the epipsammic diatoms, which are generally smaller and stick to sediment (…)</p> - <a href="https://lienss.univ-larochelle.fr/species" rel="directory">species</a> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L148xH150/arton1751-9236a.png?1737606626' class='spip_logo spip_logo_right' width='148' height='150' alt="" /> <div class='rss_texte'><h3 class="spip">BENTHIC MICROALGAE :</h3> <p>Benthic microalgae are photosynthetic microorganisms growing in the sediment, contrarily to phytoplankton that develop in the water column. The microphytobenthos can consist of diatoms, cyanobacteria, Chlorophyceae and/or flagellates. Among the diatoms, which largely dominate in intertidal mudflats of the Atlantic coasts, two types can be observed : the epipelic diatoms, which are motile, and the epipsammic diatoms, which are generally smaller and stick to sediment grains with mucilaginous secretions. Epipsammic diatoms generally dominate in the sandy and mixed sediments, while epipelic diatoms dominate in pure mud. These epipelic diatoms migrate to the sediment surface during diurnal low tides to realize the photosynthesis. Thirty-seven species of diatoms have been identified on the Brouage mudflat, which is one of the largest mudflats in the Marennes-Oléron bay.</p> <h3 class="spip">BENTHIC MICROALGAE STUDIED IN THE TEAM BIOFEEL :</h3> <p>Most of the studies on benthic microalgae are carried out on intertidal bare mudflats, but some studies are also done on other soft-bottom coastal habitats, like seagrass beds, sandflats, and shallow subtidal embayments. Researchers from the team BIOFEEL focus their research on the primary production of benthic microalgae, especially on bare mudflats, by building models of primary production based on remote sensing. Another part of the studies aims at better assessing the role of the microphytobenthos as a food source for the meiofauna, the macrofauna, and for fish (i.e. mullets).</p> <h3 class="spip">RESEARCH CARRIED OUT IN THE TEAM BIOFEEL ABOUT BENTHIC MICROALGAE :</h3> <p>Quantification of primary production based on modelling.<br class='autobr' /> Determination of the role of benthic microalgae as a food source in the functioning of intertidal and subtidal habitats using trophic markers (stable isotopes, fatty acids).</p> <h3 class="spip">RESEARCHERS FROM THE TEAM BIOFEEL WORKING ON BENTHIC MICROALGAE :</h3> <p>Christine Dupuy<br class='autobr' /> Vincent Le Fouest<br class='autobr' /> <a href='https://lienss.univ-larochelle.fr/Lebreton-Benoit' class="spip_in" hreflang="en">Benoit Lebreton</a><br class='autobr' /> Raphaël Savelli</p> <h3 class="spip">REFERENCE PUBLICATIONS :</h3><ul class="spip" role="list"><li> Blanchard G.F., 2006. Analyse conceptuelle du système de production primaire microphytobenthique des vasières intertidales. Océanis 32, 215-235.</li><li> Kromkamp J.C., de Brouwer J.F.C., Blanchard G.F., Forster R., Créach V., 2006. Functioning of microphytobenthos in estuaries. Royal Academy of Arts and Sciences, Amsterdam, 262 p.</li><li> MacIntyre H.L., Geider R.J., Miller D.C., 1996. Microphytobenthos : The ecological role of the "secret garden" of unvegetated, shallow-water marine habitats. I. Distribution, abundance and primary production. Estuaries 19, 186-201.</li><li> Miller D.C., Geider R.J., MacIntyre H.L., 1996. Microphytobenthos : The ecological role of the Secret Garden of unvegetated, shallow-water marine habitats. II. Role in sediment stability and shallow-water food webs. Estuaries 19, 202-212.</li><li> Round F.E., Crawford R.M., Mann D.G., 1990. The Diatoms : biology and morphology of the genera. Cambridge University Press, Cambridge, 747 p.</li></ul><h3 class="spip">MAJOR PUBLICATIONS OF THE TEAM BIOFEEL :</h3><ul class="spip" role="list"><li> Blanchard G.F., Guarini J.-M., Orvain F., Sauriau P.-G., 2001. Dynamic behaviour of benthic microalgal biomass in intertidal mudflats. Journal of Experimental Marine Biology and Ecology 264, 85-100.</li><li> Guarini J.-M., Blanchard G.F., Gros P., Gouleau D., Bacher C., 2000. Dynamic model of the short-term variability of microphytobenthic biomass on temperate intertidal mudflats. Marine Ecology Progress Series 195, 291-303.</li><li> Haubois A.-G., Sylvestre F., Guarini J.-M., Richard P., Blanchard G.F., 2005. Spatio-temporal structure of the epipelic diatom assemblage from an intertidal mudflat in Marennes-Oléron Bay, France. Estuarine, Coastal and Shelf Science 64, 385-394.</li><li> Herlory O., Guarini J.-M., Richard P., Blanchard G.F., 2004. Microstructure of microphytobenthic biofilm and its spatio-temporal dynamics in an intertidal mudflat (Aiguillon Bay, France). Marine Ecology Progress Series 282, 33-44.</li><li> Lebreton B., Richard P., Galois R., Radenac G., Pfléger C., Guillou G., Mornet F., Blanchard G.F., 2011. Trophic importance of diatoms in an intertidal Zostera noltii seagrass bed : Evidence from stable isotope and fatty acid analyses. Estuarine, Coastal and Shelf Science 92, 140-153.</li><li> Méléder V., Savelli R., Barnett A., Polsenaere P., Gernez P., Cugier P., Lerouxel A., Le Bris A., Dupuy C., Le Fouest V., Lavaud J., 2020. Mapping the intertidal microphytobenthos gross primary production, part I : Coupling multispectral remote sensing and physical modeling. Frontiers in Marine Science 7, 520.</li><li> Riera P., Richard P., 1996. Isotopic determination of food sources of Crassostrea gigas along a trophic gradient in the estuarine bay of Marennes-Oléron. Estuarine, Coastal and Shelf Science 42, 347-360.</li><li> Savelli R., Méléder V., Cugier P., Polsenaere P., Dupuy C., Lavaud J., Barnett A., Le Fouest V., 2020. Mapping the intertidal microphytobenthos gross Primary production, Part II : Merging remote sensing and physical-biological coupled modeling. Frontiers in Marine Science 7, 521</li><li> van der Heijden L.H., Niquil N., Haraldsson M., Asmus R.M., Pacella S.R., Graeve M., Rzeznik-Orignac J., Asmus H., Saint-Béat B., Lebreton B., 2020. Quantitative food web modeling unravels the importance of the microphytobenthos-meiofauna pathway for a high trophic transfer by meiofauna in soft-bottom intertidal food webs. Ecological Modelling 430, 109129.</li></ul></div> Mudflats https://lienss.univ-larochelle.fr/Mudflats https://lienss.univ-larochelle.fr/Mudflats 2021-01-04T10:00:32Z text/html fr Thierry Guyot <p>MUDFLATS : general description Mudflats are intertidal or subtidal habitats covered by mud. Mud is a sediment made of clay which particle size is smaller than 63 µm. These particles generally form in estuaries, where fresh- and salt-water mix, which leads fine particles to flocculate into larger particles. These particles are flushed towards the sea and then settle down in areas with low hydrodynamics. Intertidal bare mudflats, located in the shore, are characterized by a very high (…)</p> - <a href="https://lienss.univ-larochelle.fr/habitats-581" rel="directory">habitats</a> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L150xH149/arton1750-b858c.png?1737685367' class='spip_logo spip_logo_right' width='150' height='149' alt="" /> <div class='rss_texte'><h3 class="spip">MUDFLATS : general description</h3> <p>Mudflats are intertidal or subtidal habitats covered by mud. Mud is a sediment made of clay which particle size is smaller than 63 µm. These particles generally form in estuaries, where fresh- and salt-water mix, which leads fine particles to flocculate into larger particles. These particles are flushed towards the sea and then settle down in areas with low hydrodynamics. Intertidal bare mudflats, located in the shore, are characterized by a very high biological productivity, especially related to the production of benthic microalgae, which grow at the surface of the sediment. This production fuels a complex food web made of microfauna, meiofauna and macrofauna at its first trophic levels. These consumers are food resources for predators like fish and birds. The very high production of benthic microalgae on intertidal bare mudflats benefits to shellfish farming activities, especially oyster and mussel farming, as these two species largely rely on benthic microalgae when they are cultured on or close to intertidal bare mudflats.</p> <h3 class="spip">MUDFLATS specifically studied by the researchers from the team BIOFEEL : </h3> <p>The researchers from the team BIOFEEL carry out their research on the mudflats located on the Charente-Maritime coastline, located in the Marennes-Oléron bay (Brouage mudflat, Yves cove) and in the Aiguillon bay. Other mudflats are also studied, especially those located along the French Atlantic coast (Bay of Bourgneuf), in the Mont Saint-Michel Bay, in the Seine river estuary, and in the Dutch and the German (Sylt-Rømø Bight) parts of the Wadden Sea. Other studies are carried out in French Guyana and on subtidal mudflats of the shallow water bays located along the Gulf of Mexico in the United-States.</p> <h3 class="spip">RESEARCH CARRIED OUR ON MUDFLATS :</h3> <p>Research carried out on mudflats aims at understanding their functioning, by studying the structure of the flora and fauna communities which develop in intertidal bare mudflats, or colonize them, and by determining the biotic and abiotic factors structuring these communities. Flows of organic matter between these different communities are quantified and modelized to determine what are the properties of these habitats, and how they change, especially productivity. This research is carried out thanks to several methods, from molecular biology to taxonomy for the study of community structure, and from the study of gut contents to the use of trophic markers (stable isotopes, fatty acids) and models for the quantification of flows of organic matter. The data collected, gathered with outputs from models of primary production, provide information aiming at having a holistic approach of the functioning of these habitats.</p> <h3 class="spip">RESEARCHERS FROM THE TEAM BIOFEEL WORKING ON MUDFLATS :</h3> <p>Hélène Agogué<br class='autobr' /> Pierrick Bocher<br class='autobr' /> Christine Dupuy<br class='autobr' /> Denis Fichet<br class='autobr' /> Vincent Le Fouest<br class='autobr' /> <a href='https://lienss.univ-larochelle.fr/Lebreton-Benoit' class="spip_in" hreflang="en">Benoit Lebreton</a></p> <h3 class="spip">REFERENCE PUBLICATIONS :</h3><ul class="spip" role="list"><li> Beninger P., 2018. Mudflat ecology. Springer, 429 p.</li><li> Day Jr. J.W., Hall C.A.S., Kemp M.W., Yáñez-Arancibia A., 1989. Estuarine ecology. John Wiley & Sons, New York, 558 p.</li><li> Kromkamp J.C., de Brouwer J.F.C., Blanchard G.F., Forster R., Créach V., 2006. Functioning of microphytobenthos in estuaries. Royal Academy of Arts and Sciences, Amsterdam, 262 p.</li><li> Mann K.H., 1982. Ecology of coastal waters : a systems approach. Blackwell Scientific Publications, 322 p.</li><li> McLusky D.S., 1989. The estuarine ecosystem. Chapman and Hall, New York, 256 p.</li></ul><h3 class="spip">MAJOR PUBLICATIONS OF THE TEAM BIOFEEL :</h3><ul class="spip" role="list"><li> Barnett A., Méléder V., Blommaert L., lepetit B., Gaudin P., Vyverman W., Sabbe K., Dupuy C., Lavaud J., 2015. Growth form defines physiological photoprotective capacity in intertidal benthic diatoms. The ISME Journal 9, 32-45.</li><li> Blanchard G.F., 2006. Analyse conceptuelle du système de production primaire microphytobenthique des vasières intertidales. Océanis 32, 215-235.</li><li> Bocher P., Piersma T., Dekinga A., Kraan C., Yates M.G., Guyot T., Folmer E.O., Radenac G., 2007. Site- and species-specific distribution patterns of molluscs at five intertidal soft-sediment areas in northwest Europe during a single winter. Marine Biology 151, 577-594.</li><li> Lavergne C., Agogué H., Leynaert A., Raimonet M., de Wit R., Pineau P., Bréret M., Lachaussée N., Dupuy C., 2017. Factors influencing prokaryotes in an intertidal mudflat and the resulting depth gradients. Estuarine, Coastal and Shelf Science, 189, 74-83.</li><li> Lebreton B., Rivaud A., Picot L., Prévost B., Barillé L., Sauzeau T., Beseres Pollack J., Lavaud J., 2019. From ecological relevance of the ecosystem services concept to its sociopolitical use. The case study of intertidal bare mudflats in the Marennes-Oléron Bay, France. Ocean and Coastal Management 172, 41-54.</li><li> Leguerrier D., Degré D., Niquil N., 2007. Network analysis and inter-ecosystem comparison of two intertidal mudflat food webs (Brouage Mudflat and Aiguillon Cove, SW France). Estuarine, Coastal and Shelf Science 74, 403-418.</li><li> Méléder V., Savelli R., Barnett A., Polsenaere P., Gernez P., Cugier P., Lerouxel A., Le Bris A., Dupuy C., Le Fouest V., Lavaud J., 2020. Mapping the intertidal microphytobenthos gross primary production, part I : Coupling multispectral remote sensing and physical modeling. Frontiers in Marine Science 7, 520.</li><li> Riera P., Richard P., 1996. Isotopic determination of food sources of Crassostrea gigas along a trophic gradient in the estuarine bay of Marennes-Oléron. Estuarine, Coastal and Shelf Science 42, 347-360.</li><li> Savelli R., Méléder V., Cugier P., Polsenaere P., Dupuy C., Lavaud J., Barnett A., Le Fouest V., 2020. Mapping the intertidal microphytobenthos gross Primary production, Part II : Merging remote sensing and physical-biological coupled modeling. Frontiers in Marine Science 7, 521</li><li> van der Heijden L.H., Niquil N., Haraldsson M., Asmus R.M., Pacella S.R., Graeve M., Rzeznik-Orignac J., Asmus H., Saint-Béat B., Lebreton B., 2020. Quantitative food web modeling unravels the importance of the microphytobenthos-meiofauna pathway for a high trophic transfer by meiofauna in soft-bottom intertidal food webs. Ecological Modelling 430, 109129.</li></ul></div> Axis 1: Physiological and behavioural performances of animals in response to environmental variations https://lienss.univ-larochelle.fr/Axis-1-Physiological-and-behavioural-performances-of-animals-in-response-to https://lienss.univ-larochelle.fr/Axis-1-Physiological-and-behavioural-performances-of-animals-in-response-to 2018-07-25T13:28:32Z text/html en Tiffany Diague <p>Axis 1 works are about the study of physiological and behavioural responses at different organization levels (molecule, cell, organ, individual, population). In this context, some physiological functions of interest – immunity function, detoxification, breathing and filtration, cardiac function, energetic metabolism and locomotion – are favoured in order to better understand the mechanisms of their functioning, or the dysfunction toward environmental factors such as temperature, hypoxia, (…)</p> - <a href="https://lienss.univ-larochelle.fr/AMARE-Marine-animals-responses-to-environmental-variability" rel="directory">AMARE (Marine animals responses to environmental variability)</a> <div class='rss_texte'><p>Axis 1 works are about the study of physiological and behavioural responses at <strong>different organization levels</strong> (molecule, cell, organ, individual, population). In this context, some physiological functions of interest – <strong>immunity function, detoxification, breathing and filtration, cardiac function, energetic metabolism and locomotion</strong> – are favoured in order to better understand the mechanisms of their functioning, or the dysfunction toward environmental factors such as <strong>temperature, hypoxia, nutritional quality, acidification, or chemical contaminants</strong>. More precisely, we focus our works on the study of physiological processes having an ecological pertinence, via cellular physiology, biochemistry & functional genomics approaches, and individual approaches: behaviour, breathing, locomotion, growth.</p> <div class='spip_document_3510 spip_document spip_documents spip_document_image spip_documents_center spip_document_center spip_document_avec_legende' data-legende-len="82" data-legende-lenx="xx" > <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L400xH173/cell_amare_lienss-247ea.jpg?1737690529' width='400' height='173' alt='' /> <figcaption class='spip_doc_legende'> <div class='spip_doc_descriptif '>Killifish (Nothobranchius furzeri)'s cardiac cell marked with DAPi + Phalloidine </div> </figcaption></figure> </div> <p>These questions are constantly put back in an environmental context, taking account of the importance of abiotic (temperature), biotic (ontogenetic stage) and ecologic (spatio-temporal variations, change of ecosystem structure and trophic functioning) factors.</p> <p> The aim of these works is multiple and tries to lead to:</p> <ul class="spip" role="list"><li> The identification of causal relations between environmental forcing, biological mechanisms and individual performances</li><li> The understanding of the implications of physiological mechanisms in ecological processes</li><li> The definition of the thresholds of organisms' sensitivity toward environmental pressures</li><li> The definition of tolerance range in which occurs the physiologic functions necessary to maintain the organism's fitness</li></ul><div class='spip_document_3511 spip_document spip_documents spip_document_image spip_documents_center spip_document_center spip_document_avec_legende' data-legende-len="87" data-legende-lenx="xx" > <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L330xH94/mullet_amare_lienss-87b91.gif?1737690529' width='330' height='94' alt='' /> <figcaption class='spip_doc_legende'> <div class='spip_doc_descriptif '>Escape of a startled golden grey mullet (images from a 500 frame/s high speed camera) </div> </figcaption></figure> </div><h4 class="spip">Some current projects: </h4><ul class="spip" role="list"><li> Project Port de Plaisance La Rochelle: Improvement of environment quality (interannual follow-up) (2015-2018)</li><li> Project NITOXMOR: <i>pseudo-nitzschia</i>: toxicity or mortality? (2018)</li><li> Project PECTIMPACT (MAE/ Royal Norwegian Embassy): Multidisciplinary approach to PECTinidae <i>Chlamys sp</i>: IMPACT of a chemical contamination (2016-2019).</li><li> Project ECONAT (FEDER/CPER): port dynamics, urban environments and maritime environment DYPOMAR (2015-2020).</li></ul> <p> </p> <h4 class="spip">Participants of the axis:</h4><ul class="spip" role="list"><li> Permanent staff: <a href='https://lienss.univ-larochelle.fr/Aubert-Anne' class="spip_in" hreflang="fr">Anne Aubert</a> ; <a href='https://lienss.univ-larochelle.fr/Imbert-Auvray-Nathalie-1328' class="spip_in">Imbert Nathalie</a> ; <a href='https://lienss.univ-larochelle.fr/Lefrancois-Christel' class="spip_in" hreflang="fr">Lefrançois Christel</a> ; <a href='https://lienss.univ-larochelle.fr/Murillo-Laurence' class="spip_in" hreflang="fr">Murillo Laurence</a> ; <a href='https://lienss.univ-larochelle.fr/Rosenfeld-Eric-1394' class="spip_in">Rosenfeld Eric</a> ; <a href='https://lienss.univ-larochelle.fr/Goubet-Isabelle' class="spip_in" hreflang="fr">Isabelle Goubet</a> ; <a href='https://lienss.univ-larochelle.fr/Thomas-Helene' class="spip_in" hreflang="fr">Thomas Helene</a> ; <a href='https://lienss.univ-larochelle.fr/Vagner-Marie-1334' class="spip_in">Vagner Marie</a></li><li> CDD: N Ouillon (IE)</li><li> PhD students: <a href='https://lienss.univ-larochelle.fr/Breitwieser-Marine' class="spip_in" hreflang="fr">Breitwieser Marine</a></li><li> Platforms: Ecophysiology, Aquarium, Swamp, Molecular Biology, Imaging Cytometry, High resolution analysis of biomolecules, Elementaries analysis</li></ul></div> List of the 16 monitored hydrological variables https://lienss.univ-larochelle.fr/List-of-the-16-monitored-hydrological-variables https://lienss.univ-larochelle.fr/List-of-the-16-monitored-hydrological-variables 2018-07-03T07:37:16Z text/html en Thierry Guyot <p>Temperature (T) Units: °C Salinity (S) No units Dissolved oxygen (O2) Units: ml L-1 Hydrogen ion activity (pH) Units: Log scale Ammonium (NH4+) : Units: µm L-1 Nitrates (NO3-) : Units: µm L-1 Nitrites (NO2-) : Units: µm L-1 Phosphates (PO43-) : Units: µm L-1 Silicates (Si(OH)4) : Units: µm L-1 Particulate organic carbon (POC) : Units: µg/l Particulate organic nitrogen (PON) : Units: µg L-1 Suspended particules (SPM) : Units: mg L-1 Chlorophyll a (Chla) : Units: µg L-1 δ13C : Units: ‰ δ15N (…)</p> - <a href="https://lienss.univ-larochelle.fr/SOMLIT" rel="directory">SOMLIT</a> <div class='rss_texte'><ul class="spip" role="list"><li> Temperature (T) Units: °C</li><li> Salinity (S) No units</li><li> Dissolved oxygen (O<sub>2</sub>) Units: ml L-1</li><li> Hydrogen ion activity (pH) Units: Log scale</li><li> Ammonium (NH<sub>4</sub>+) : Units: µm L-1</li><li> Nitrates (NO<sub>3</sub>-) : Units: µm L-1</li><li> Nitrites (NO<sub>2</sub>-) : Units: µm L-1</li><li> Phosphates (PO<sub>4</sub>3-) : Units: µm L-1</li><li> Silicates (Si(OH)<sub>4</sub>) : Units: µm L-1</li><li> Particulate organic carbon (POC) : Units: µg/l</li><li> Particulate organic nitrogen (PON) : Units: µg L-1</li><li> Suspended particules (SPM) : Units: mg L-1</li><li> Chlorophyll a (Chl<i>a</i>) : Units: µg L-1</li><li> δ<sup>13</sup><sub>C</sub> : Units: ‰</li><li> δ<sup>15</sup>N Units: ‰</li><li> Pico-Nanoplankton Units : abundance per functional group</li><li> CTD profile : temperature, conductivity, pressure, fluorimetry and turbidity</li></ul></div> Brownlie Katherine https://lienss.univ-larochelle.fr/Brownlie-Katherine-1533 https://lienss.univ-larochelle.fr/Brownlie-Katherine-1533 2018-06-26T12:01:45Z text/html en Thierry Guyot <p>PhD (2016-2019)<br class='manualbr' />Doctoral school of environmental science “Gay Lussac”, La Rochelle University<br class='manualbr' /><strong class="caractencadre-spip spip">Original training : </strong> Erasmus Mundus - Masters Degree Marine Biodiversity and Conservation Science (EMBC)</p> - <a href="https://lienss.univ-larochelle.fr/Staff-Directory" rel="directory">Staff Directory</a> <div class='rss_chapo'><p>(2016-2019) Modelling the drivers of population change in Australia's most numerous seabird, the short-tailed shearwater <i>(Ardenna tenuirostris)</i></p></div> <div class='rss_texte'><p><strong class="caractencadre-spip spip">Supervisors :</strong></p> <ul class="spip" role="list"><li> John Arnould, Deakin University</li><li> <a href='https://lienss.univ-larochelle.fr/Fort-Jerome' class="spip_in" hreflang="fr">Jérôme Fort</a>, La Rochelle University</li><li> <a href='https://lienss.univ-larochelle.fr/Bustamante-Paco-189' class="spip_in" hreflang="fr">paco Bustamante</a>, La Rochelle University</li></ul> <p><strong class="caractencadre-spip spip">Funding</strong> : Deakin University, Postgraduate Research Scholarship (DUPRS)</p> <hr><br class='manualbr' /><h5 class="spip"><div class="spip spip-block-center" style="text-align:center;"> Modelling the drivers of population change in Australia's most numerous seabird, the short-tailed shearwater <i>(Ardenna tenuirostris)</i></div></h5> <div class="texteencadre-spip spip">Seabirds are top order predators which account for the greatest marine biomass extraction throughout the world and, consequently, play an important role in marine ecosystem dynamics. In addition, as transporters of marine nutrients to their breeding colonies, they act as de facto ecosystem engineers of the terrestrial island habitats where they nest. Seabirds also exhibit distinctive and measurable responses to environmental variability at a range of temporal and spatial scales making them early and effective indicators of the effects of climate change on marine ecosystems. In particular, abundant, highly mobile species such as trans-equatorially migrating procellariiformes, could be especially useful indicators of global environmental change. The observable behaviours and demographic parameters reflect and integrate both the spatial variability experienced during the annual cycle and the temporal variability experienced during their long lives. <br> <br> Australia's endemic short-tailed shearwater (STSW, Ardenna tenuirostris) is an example of such a species. Its breeding distribution is restricted to south-eastern Australia, currently the fastest warming oceanic region in the world and where currents are predicted to alter due to climate change, potentially resulting in considerable changes to STSW prey populations. Accurate knowledge of the factors affecting the population dynamics of species such as the STSW is urgently required to predict how global change will affect them, the prey populations they depend upon, and the ecosystems they influence. The aim of this project is to improve our understanding of the impacts of global change by establishing links between STSW demographic parameters and environmental variability, using a novel integrated approach. To do so, we will integrate data obtained from standard biological monitoring techniques with that from state-of-the-art animal tracking and remote sensing approaches in a novel modelling framework.</div><div class='spip_document_3465 spip_document spip_documents spip_document_image spip_documents_center spip_document_center spip_document_avec_legende' data-legende-len="72" data-legende-lenx="xx" > <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L500xH332/puffin-b1102.png?1737570375' width='500' height='332' alt='' /> <figcaption class='spip_doc_legende'> <div class='spip_doc_descriptif '>Puffin à bec grêle (<i>Ardenna tenuirostris</i>) sur l'île Kanowna, Australie </div> </figcaption></figure> </div></div> <div class='rss_ps'><p>katherine.brownlie1*at*univ-lr.fr</p></div> Observatories https://lienss.univ-larochelle.fr/Observatories-1532 https://lienss.univ-larochelle.fr/Observatories-1532 2018-06-26T10:18:14Z text/html fr Thierry Guyot - <a href="https://lienss.univ-larochelle.fr/Observatories" rel="directory">Observatories</a> SOMLIT: French Coastal Monitoring Network https://lienss.univ-larochelle.fr/SOMLIT-French-Coastal-Monitoring-Network https://lienss.univ-larochelle.fr/SOMLIT-French-Coastal-Monitoring-Network 2018-06-26T10:10:01Z text/html en Thierry Guyot <div class='spip_document_1784 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/IMG/jpg/logo-somlit-small.jpg' width="100" height="40" alt='' /> </figure> </div> - <a href="https://lienss.univ-larochelle.fr/SOMLIT" rel="directory">SOMLIT</a> <div class='rss_texte'><table class="table spip"> <thead><tr class='row_first'><th id='id1d1f_c0'></th><th id='id1d1f_c1'></th><th id='id1d1f_c2'></th><th id='id1d1f_c3'></th></tr></thead> <tbody> <tr class='row_odd odd'> <th headers='id1d1f_c0' id='id1d1f_l0'><div class='spip_document_3445 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L150xH200/cnrs_20171011_091042-c1e1b.jpg?1737562389' width='150' height='200' alt='' /> </figure> </div></th> <td headers='id1d1f_c1 id1d1f_l0'><strong><div class='spip_document_3447 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L300xH200/cnrs_somlit_2014-09-1-3980f.jpg?1737562389' width='300' height='200' alt='' /> </figure> </div></strong> </td> <td headers='id1d1f_c2 id1d1f_l0'><strong><div class='spip_document_3448 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L355xH200/cnrs_somlit_2017-08-11_sortie-9666b.jpg?1737562389' width='355' height='200' alt='' /> </figure> </div></strong> </td></tr> </tbody> </table><a href='https://lienss.univ-larochelle.fr/SOMLIT-Service-d-Observation-en-Milieu-LITtoral' class="spip_in" hreflang="fr"><div class='spip_document_3463 spip_document spip_documents spip_document_image spip_documents_left spip_document_left'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L35xH35/french_flagok-46b3a.png?1737691826' width='35' height='35' alt='' /> </figure> </div> <p>version française</p> </a><h3 class="spip">SOMLIT:</h3> <p>SOMLIT, the French Coastal Monitoring Network, was created in 1996 and is supported by the CNRS-INSU Institute. Ten marine stations and/or laboratories along the French coastline from Wimereux (English Channel), Brest (Atlantic) to Marseille (Mediterranean Sea) are nowadays involved. All of them follow standardized sampling and analytical protocols.<br class='autobr' /> The overall goal of the SOMLIT monitoring network is to assess long-term changes in coastal systems and to discriminate climatic forcing from local anthropogenic ones. <br class='autobr' /> Physical, chemical, biogeochemical, and biological parameters are monitored.<br class='autobr' /> Within the scope of the SOMLIT, standardized sampling includes: <br /><span class="spip-puce ltr"><b>–</b></span> One unique sub-surface sample (Niskin bottle) at high tide (± 1 h) every 15 days ; <br /><span class="spip-puce ltr"><b>–</b></span> One CTD vertical profile ; <br /><span class="spip-puce ltr"><b>–</b></span> A group of <a href='https://lienss.univ-larochelle.fr/List-of-the-16-monitored-hydrological-variables' class="spip_in">16 surveyed parameters</a> ; <br /><span class="spip-puce ltr"><b>–</b></span> A quality control process based on the NF/EN ISO/CCI 17025 standard ; <br /><span class="spip-puce ltr"><b>–</b></span> Annual inter-comparison exercises between all SOMLIT and Ifremer teams.<br class='autobr' /> All data are public and freely available through requests from the <a href="http://somlit.epoc.u-bordeaux1.fr/fr/" class="spip_out" rel="external">SOMLIT web site</a>.</p> <h3 class="spip">SOMLIT at La Rochelle :</h3> <p>The marine laboratory LIENSs was integrated within the SOMLIT network in 2012 following a 6-month period of development since June 2011.<br class='autobr' /> Our sampling station 'Antioche' is located within the Pertuis d'Antioche at 5 nautical miles from the harbour of Chef de Baie (La Rochelle). This is a macrotidal site (depth 40 m, tidal range 6.5 m) not directly impacted by both local river estuarine plumes (Lay, Sèvre and Charente rivers) and human activities (oyster and mussel farming, fishing grounds, dredging activities). Hydrological features are mainly characterized by oceanic influence but both Loire and Gironde plumes may interact during wintertime. The geographic location of the SOMLIT station was chosen to provide additional oceanic information compared of hydrological coastal stations involved in WDF (Water Directive Framework) networks.<br class='autobr' /> Water samples are collected at high tide during period of low spring tides (tidal coefficient 70 ± 10) using facilities of the vessel L'ESTRAN from La Rochelle University.</p> <div class='spip_document_3461 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L500xH437/en-somlit-fig1-332bc.png?1737691826' width='500' height='437' alt='' /> </figure> </div> <p>Near surface marine water samples are collected by Niskin sampler ; vertical profil by a Seabird SBE 19plus CTD and qualitative phytoplankton data by a 10 µm mesh plankton net.</p> <div class='spip_document_3460 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L500xH534/en-somlit-fig2-c2703.png?1737691826' width='500' height='534' alt='' /> </figure> </div> <p>Marine water samples are poured into clean small glass and/or PET containers specificaly designed for O2, pH, nutrients, pico-nano plankton analyses.</p> <div class='spip_document_3459 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L500xH431/en-somlit-fig3-d9035.png?1737691826' width='500' height='431' alt='' /> </figure> </div> <div class='spip_document_3458 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L500xH406/en-somlit-fig4-50486.png?1737691826' width='500' height='406' alt='' /> </figure> </div> <p><strong class="caractencadre-spip spip">Organisation chart :</strong></p> <div class='spip_document_3469 spip_document spip_documents spip_document_image spip_documents_center spip_document_center'> <figure class="spip_doc_inner"> <a href='https://lienss.univ-larochelle.fr/IMG/png/organigramme-somlit-en.png' class="spip_doc_lien mediabox" type="image/png"> <img src='https://lienss.univ-larochelle.fr/local/cache-vignettes/L500xH301/organigramme-somlit-en-fd7b8.png?1737691826' width='500' height='301' alt='' /></a> </figure> </div><h3 class="spip">Links:</h3> <p><strong class="caractencadre-spip spip">Scientific leader : </strong> <a href='https://lienss.univ-larochelle.fr/Sauriau-Pierre-Guy-259' class="spip_in" hreflang="fr">Pierre-Guy Sauriau</a>, Chargé de Recherche CNRS, tél : 05 46 50 76 38, <br class='autobr' /> Email : <a href="mailto:Pierre-guy.sauriau@univ-lr.fr" class="spip_mail">pierre-guy.sauriau@univ-lr.fr</a></p> <p><strong class="caractencadre-spip spip">Quality supervisor : </strong> <a href='https://lienss.univ-larochelle.fr/Pineau-Philippe-184' class="spip_in" hreflang="fr">Philippe Pineau</a>, Assistant-Ingénieur CNRS, tél : 05 46 50 76 60, <br class='autobr' /> Email : <a href="mailto:philippe.pineau@univ-lr.fr" class="spip_mail">philippe.pineau@univ-lr.fr</a></p> <p><strong class="caractencadre2-spip spip">Published : June 2018</strong></p></div> <div class="hyperlien">View online : <a href="http://somlit.epoc.u-bordeaux1.fr/fr/" class="spip_out">National SOMLIT Web site</a></div> Axis 2: Potentiation of biological effects by vectorization, encapsulation and functionalization https://lienss.univ-larochelle.fr/Axis-2-Potentiation-of-biological-effects-by-vectorization-encapsulation-and https://lienss.univ-larochelle.fr/Axis-2-Potentiation-of-biological-effects-by-vectorization-encapsulation-and 2018-06-14T08:38:09Z text/html en Tiffany Diague <p>Our team's axis 2 is interested in developing and applying different methodologies aiming to improve biological effects of molecules produced in axis 1. Therefore, several strategies (functionalization, encapsulation, nanovectorization, actives combination) are studied. <br class='autobr' /> Thematic 1: Potentiate anti-cancerous effects <br class='autobr' /> Project 1: Modification of bioactive molecules by chemical/enzymatic functionalization Synthesis of small polynitrogen heterocyclic of different types such as (…)</p> - <a href="https://lienss.univ-larochelle.fr/BCBS-Biotechnologies-and-Chemistry-applied-to-Bioresources-for-Health" rel="directory">BCBS (Biotechnologies and Chemistry applied to Bioresources for Health applications)</a> <div class='rss_chapo'><p>Our team's axis 2 is interested in developing and applying different methodologies aiming to improve biological effects of molecules produced in axis 1. Therefore, several strategies (functionalization, encapsulation, nanovectorization, actives combination) are studied.</p></div> <div class='rss_texte'><h3 class="spip"> <strong>Thematic 1: Potentiate anti-cancerous effects</strong> </h3> <p> </p> <h4 class="spip">Project 1: Modification of bioactive molecules by chemical/enzymatic functionalization </h4> <p> </p> <p><span class="spip-puce ltr"><b>–</b></span> Synthesis of small polynitrogen heterocyclic of different types such as diazaindole, oxindoles polynitrogen, thiazolopiridazoindazoles, targeting kinases (CDK, PI3Kα, haspine, or DYRK1A/CLK1) involved in the RNAm's splicing and carcinogenesis process. <a href='https://lienss.univ-larochelle.fr/Thiery-Valerie' class="spip_in" hreflang="fr">Valérie Thiery</a><br class='autobr' /> </p> <h4 class="spip">Project 2: Conception of nano-objects for guided biotherapies of tumor microenvironment and diagnostic monitoring by clinic imaging </h4> <p><strong class="caractencadre-spip spip">Key words:</strong> <i>tumorous microenvironment, iron oxide nanoparticles, positive contrast MRI, vectorization, sulfated polysaccharides, heparanase inhibitors</i><br class='autobr' /> </p> <p><span class="spip-puce ltr"><b>–</b></span> Conception and characterization of a new generation of iron oxide nanoparticles (IONP) extremely tiny, bio-conjugated to sulfated polysaccharides able to produce a positive contrast in magnetic resonance imaging (MRI). Hugo Groult</p> <p><span class="spip-puce ltr"><b>–</b></span> Analysis in vivo of the bio-distribution of anti-tumorous nanovectors by MRI imaging among mice, and pharmacokinetics. Optimization towards bimodal diagnostic probes. (PET/MRI) <a href='https://lienss.univ-larochelle.fr/Groult-Hugo' class="spip_in" hreflang="fr">Hugo Groult</a><br class='autobr' /> </p> <h3 class="spip"><strong>Thematic 2: Potentiate cosmetic and nutraceutical effects</strong></h3> <p> </p> <h4 class="spip">Project 1: Actives encapsulation / Formulation </h4> <p> <br /><span class="spip-puce ltr"><b>–</b></span> Elaboration of encapsulation systems with monitored release of actives coming from natural biopolymers of marine or terrestrial plants sources. <a href='https://lienss.univ-larochelle.fr/Carpentier-Jeremy' class="spip_in" hreflang="fr">Jérémy Carpentier</a> (PhD student)<br class='autobr' /> </p> <h3 class="spip"> <strong>Thematic 3: Potentiate anti-microbial effects</strong> </h3> <p> </p> <h4 class="spip">Project 1: Combined action of molecules, synergy and restauration of sensitivity to antibiotics of pathogenic bacteria.</h4> <p> </p> <h4 class="spip">Project 2: Synthesis and modification by chemical means, or by genetic engineering of molecules of interest</h4> <p> </p> <h4 class="spip">Project 3: Characterization of the surface properties of supports on which anti-biofilm molecules can adhere. </h4></div>