ArcticNet - About us

Gwenaëlle Gremion
Institut des sciences de la mer de Rimouski, UQAR

(Biography) Actual position : PhD candidate - Physical & Biological Oceanography & ASA president UQAR-ISMER ? CANADA (2015- ) Education : CREPUQ exchange Msc. Oceanography UQAR-ISMER ? CANADA (2012-2013) Master?s Degree « Natural and anthropised aquatic and terrestrial ecosystems » University of Montpellier 2 (UM2) ? FRANCE (2011-2013) Bachelor?s Degree « Biology of organisms » University of Guadeloupe (UAG) & Montpellier 2 (UM2) ? FRANCE (2008-2011) Contributions: Smeti, E., Roelke, D. L., Gremion, G., Linhart, J. M., Danielidis, D. B., & Spatharis, S. (2015). Potential mechanisms of coexistence between two globally important Pseudo-nitzschia (Bacillariophyta) species. Hydrobiologia, 1-13.   Schloss, I.R.*,  D. Dumont, L. Saravia, M. Hernando, G. Gremion, M. Hoffmeyer, C. ?A. Michaud-Tremblay, M. García, M. Vernet, G. Ferreyra.  Ecosystem shifts in a changing climate. ImcoNet modelling workshop, Bremerhaven, Allemagne, Juin 2014.  Gremion G., Dumont D., Schloss.I, (2013) internship report - Climate change signature in a long-term data series, the Palmer Antarctic Long-Term Ecological Research (Pal-LTER) : modeling the plankton system and its response to future climate scenarios. Université du Québec à Rimouski (UQAR-ISMER), Janvier-Juin Gremion G., Spatharis S. , Tsirtsis G., (2012) internship report- Study of the relation between phytoplankton semi-continuous cultures/chemostats and modelling techniques. University of the Aegean, Grèce, Mars-Juin.   Gremion G., Schloss I., Dumont D., Vernet M. (2013) Climate change signature in Palmer Station, Antarctic Peninsula : modeling the response of the plankton system , XIth Scar Biology Symposium, Barcelone, Espagne, 15?19 juillet. Gremion G., Schloss I.,Archambault P., Dumont D. (2015)La modélisation numérique : un outil d'étude pour évaluer les impacts des changements climatiques dans la polynie des Eaux du Nord sur la production primaire et l'écosystème benthique, 14e Assemblée Générale Annuelle de Québec-Océan, Québec, Canada, 10?11 Novembre. Gremion G., Schloss I.,Archambault P., Dumont D. (2015) When numerical modeling tale us the story of the actual and future nature of the annual seafloor feast in the North Water Polynya, 11e réunion scientifique annuelle d?ArcticNet (ASM2015), Vancouver, Canada, 7?11 Décembre. *Others experiences in the scientific domain Dec 2015 ?Feb 2016 : Project ANPCYT ? under the direction of Dr Schloss I., Dr Hernando.M, Dr Varela D. ? Institut Antarctique Argentin (Antarctique,Argentine). « Study of the combined effect of increase of temperature and decrease of salinity on polar planktonic communities ( Arctic & Antarctic) ». Microcosms experiments - Carlini base, Antarctique. May 2014 - Internship of Research with Schloss Irene and Dumont Dany - UQAR-ISMER (Canada) « Climate change signature in a long-term data series, the Palmer Antarctic Long-Term Ecological Research (Pal-LTER) : modeling the plankton system and its response to future climate scenarios » (Internship of 2013 continuation). January 2013 ? June 2013 - Internship of Research with Schloss Irene and Dumont Dany - UQAR-ISMER (Canada) « Climate change signature in a long-term data series, the Palmer Antarctic Long-Term Ecological Research (Pal-LTER) : modeling the plankton system and its response to future climate scenarios ». March 2012 - June 2012 - Internship of Research with Tsirtsis Georgios and Spatharis Sofia - University of the Aegean (Greece) « Study of the relation between phytoplankton semi-continuous cultures/chemostats and modeling techniques ».

 

Membre d’un projet

Arc3Bio (biodiversité marine, productivité biologique et biogéochimie dans l'Arctique canadien en évolution)

Section des étudiants

Titre de la thèse:
Modélisation du couplage pélago-benthique dans la polynie des Eaux du Nord dans un contexte de changements climatiques rapides. Impacts of the disappearance of the polynia on the primary production and pelagic-benthic coupling.

Résumé de thèse:
The rapid warming, especially in polar regions, will result in higher water temperatures, increase of fluvial run-off and reduction of ice-cover which will lead to severe ecosystem changes, propagating through all trophic levels. As primary production is strongly dependent of oceanographic features, studying its variability and response to environmental modifications remains a challenge for scientists. North Water Polynya (NOW), in North Baffin Bay, is one of the most productive ecosystems of the Arctic. In the NOW,sea ice melts earlier comparing to other surrounding area, allowing sunlight to penetrate and wind to affect water column processes (upwelling of nutrient), leading to a phytoplankton bloom. Since a few decade, sea ice dynamic has changed leading to modifications of the primary production dynamic and related to pelagic and benthic food web. Despite the numerous evidences of recent alterations in the ecosystem of the NOW, reasons of this modification still unexplained, and knowledge of polynya ecosystem dynamic need to be improve. The aim of this study is to understand how primary production, and pelago-benthic coupling will respond to environmental changes (retreating sea ice) in the NOW. We expect to observe a change in the dominant pathways, timing, and composition of the primary producers bloom. We also expect to see changes in intensity links in the sea-ice dynamic. Moreover, we believe modifications in the pelagic pathways could lead to a drastic modification in the community and production. To answer these questions, we will develop a 3-D physical circulation model for the area. This will allow us to understand the mechanisms necessary for the formation and maintenance of the polynya (Ice bridge and up welling) over a year. For the second part of this project we will build and parameterise a pelago-benthic coupling realistic model of the marine system of the NOW. The main challenge of this project will firstly be, to build this biological model while taking into consideration the different time and space scales between pelagic production and benthic response, and secondly to couple these features into the physical circulation model. The third part of this study, will be to implement this tool (the general physical-biological coupling model set up for the NOW) in order to predict ecosystem dynamic, especially primary production, under climate change conditions expected for the NOW region.

Superviseur du réseau:
Dany Dumont
Philippe Archambault

Adresse principale

Institut des sciences de la mer de Rimouski, UQAR
Physical Oceanography
Local : O-240.1 - UQAR/ISMER - 310, allée des Ursulines, C.P. 3300
Rimouski, Quebec G5L 3A1

Téléphone: 418 723-1986 poste 1873

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