CYR Frederic
Fonction : chercheur postoctoral
frederic.cyr

mio.osupytheas.fr
004
Bureau: 26M / 120, Bât: Med - Site : Luminy
Activités de Recherche: |
Rôle des paramètres physiques sur la matière organique dissoute dans la baie de Marseille et le golfe du Lion. |
Projets de Recherche: |
Projet NeXOS |
Programme de Recherche/CV: | |
Domaines de Recherche: - Sciences de l'environnement/Milieux et Changements globaux
- Planète et Univers/Océan, Atmosphère
- Sciences de l'environnement
- Planète et Univers
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Productions scientifiques :

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A New Glider-Compatible Optical Sensor for Dissolved Organic Matter Measurements: Test Case from the NW Mediterranean Sea 
Auteur(s): Cyr F. , Tedetti M., Doglioli A., Petrenko A., Goutx M.
(Article) Publié:
Frontiers In Marine Science, vol. 4 p.article 89 (2017)
Ref HAL: hal-01580281_v1
DOI: 10.3389/fmars.2017.00089
Exporter : BibTex | endNote
Résumé: The MiniFluo-UV is a new glider-compatible optical sensor for measurements of dissolved organic matter (DOM) in natural waters. The working principle, sensor design and challenges faced during the validation phase are reported. The first in situ application of the sensor during three glider deployments in the NW Mediterranean sea (spring, summer, and fall) are also presented. For these campaigns, the two channels of the sensor were adjusted to target Tryptophan-like (excitation/emission wavelengths λEx/λEm: 275/340 nm) and Phenanthrene-like (λEx/λEm: 255/360 nm) fluorescence. These were chosen because they represent fluorophores of interest commonly found in seawater. While Tryptophan (an amino-acid believed to be a by-product of biological activity) is naturally found in the ocean, Phenanthrene (a polycyclic aromatic hydrocarbon) is mainly introduced in the environment by human activities. The addition of these variables to more common physical and biogeochemical glider measurements reveals new features of DOM dynamics in the Mediterranean Sea. For example, the temporal and spatial decoupling between Tryptophan-like and Chl-a fluorescence suggests that the former is not only a marker of phytoplankton activity, but could also give more subtle information on the microbial processes occurring. The identification of a Phenanthrene-like layer just below the pycnocline at all seasons also raises questions on the mechanisms driving its presence in the Mediterranean. Knowing that the role of ocean DOM on atmospheric carbon sequestration is becoming clearer, the high spatio-temporal resolution possible with this new sampling strategy may represents a key step toward our deep understanding of DOM dynamics and its role on the biological pump.
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Impacts of Intraguild Predation on Arctic Copepod Communities 
Auteur(s): Dufour Karolane , Maps Frederic, Plourde Stéphane, Joly Pierre, Cyr F.
(Article) Publié:
Frontiers In Marine Science, vol. 3 p.10.3389/fmars.2016.00185 (2016)
Ref HAL: hal-01410039_v1
DOI: 10.3389/fmars.2016.00185
Exporter : BibTex | endNote
Résumé: Communities of large copepods form an essential hub of matter and energy fluxes in Arctic marine food webs. Intraguild predation on eggs and early larval stages occurs among the different species of those communities and it has been hypothesized to impact its structure and function. In order to better understand the interactions between dominant copepod species in the Arctic, we conducted laboratory experiments that quantified intraguild predation between the conspicuous and omnivorous Metridia longa and the dominant Calanus hyperboreus. We recorded individual egg ingestion rates for several conditions of temperature, egg concentration, and alternative food presence. In each of these experiments, at least some females ingested eggs but individual ingestion rates were highly variable. The global mean ingestion rate of M. longa on C. hyperboreus eggs was 5.8 eggs ind−1 d−1, or an estimated 37% of M. longa daily metabolic need. Among the different factors tested and the various individual traits considered (prosome length, condition index), only the egg concentration had a significant and positive effect on ingestion rates. We further explored the potential ecological impacts of intraguild predation in a simple 1D numerical model of C. hyperboreus eggs vertical distribution in the Amundsen Gulf. Our modeling results showed an asymmetric relationship in that M. longa has little potential impact on the recruitment of C. hyperboreus (<3% egg standing stock removed by IGP at most) whereas the eggs intercepted by the former can account for a significant portion of its metabolic requirement during winter (up to a third).
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Mapping the planktonic community across submesoscale physical features: the 2015 OSCAHR cruise in the NW Mediterranean 
Auteur(s): Doglioli A., Gregori G., Thyssen M., Wagener T., Marrec P., Rougier G., Bhairy N., Fenouil Julien, De-Verneil A., Rousselet L., Cyr F., Petrenko A., Andre J. M., D'Ovidio Francesco, Pietri Alice, Nencioli F., Jullion L., Pinazo C., Yohia C., Marsaleix Patrick
Conference: 48th International Liège Colloquium on Ocean Dynamics (Liège, BE, 2016-05-23)
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Submesoscale dynamics of dissolved organic matter across the Northern Mediterranean Current revealed from a new glider-mounted optical sensor Method Minifluo-UV 
Auteur(s): Cyr F., Goutx M., Tedetti M., Béguery Laurent, Besson Florent, Méry Marion, Bhairy N., Petrenko A., Doglioli A.
(Affiches/Poster)
, 2016
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Insights from a 3-D temperature sensors mooring on stratified ocean turbulence 
Auteur(s): Van Haren Hans, Cimatoribus Andrea A., Cyr F., Gostiaux Louis
(Article) Publié:
Geophysical Research Letters, vol. 43 p.4483 - 4489 (2016)
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