Emma MICHAUD

bioturbation / biogeochemical fluxes / functional ecology / benthic biodiversity / mangroves


CNRS

Assignment

LEMAR laboratory

Discovery

Contact

emma.michaud@univ-brest.fr

(+33)2 98 49 87 75

I study the effects of bioturbation activities by benthic invertebrates on the geochemical characteristics and biogeochemical fluxes of coastal sediments. Due to the strong natural and anthropogenic constraints affecting coastal environments, I am interested byt the impacts of benthic biodiversity changes within communities on the bioturbation activities. I use a biodiversity functional approach. I have chosen to address my scientific questions inl ecosystems storing large quantities of carbon (e.g. mangroves, estuaries, fjords) where the bioturbation activities modify this burial and/or OM degradation processes. I work both through experimental approaches in the laboratory (microcosms) or in the field (benthic mesocosms), but also through observations during fieldworks in coastal environments. I am using advanced technologies for 2D or 3D analysis and observation of the sedimentary matrix (planar Optodes, CT-Scan X-rays, Drone, photogrammetry, remote sensing…) in working closely with chemists, physicists and engineers colleagues, in order to integrate in my works the spatial heteogeneity of the studied areas, from micro to macro-scale.

I have been coordinating for a few years various national and international programs (ANR projects, EC2CO, GDR LIGA) about the functioning of mangrove ecosystems, mainly on the French Guiana coast whose dynamics under Amazonian influence makes it a very original case study, and I strongly participate in projects on other types of French Over-seas mangroves aiming to study the vulnerability of these environments to various pressures.

Within Lemar, I co-manage with my colleague S. Petek (IRD), the transverse axis “Lemar in the South” and I am involved in different committees locally within IUEM and Isblue.

Dirberg, G., Barnaud, G., Brivois, O., Caessteker, P., Cormier-Salem, M. C., Cuny, P., Fiard, M., Fromard, F., Gilbert, F., Grouard, S., Guiral, D., Hubas, C., Imbert, D., Lamy, D., Meziane, T., Michaud, E., Michelet, C., Militon, C., Pibot, A., … Monnier, O. (2020). Towards the Development of Ecosystem-Based Indicators of Mangroves Functioning State in the Context of the Eu Water Framework Directive. Vie Et Milieu-Life and Environment, 70(3–4), 303–310. https://www.webofscience.com/wos/woscc/full-record/WOS:000675537200029 Cite
Cuny, P., Jezequel, R., Michaud, E., Sylvi, L., Gilbert, F., Fiard, M., Chevalier, C., Morel, V., & Militon, C. (2020). Oil Spill Response in Mangroves: Why a Specific Ecosystem-Based Management Is Required? The Case of French Guiana - a Mini-Review. Vie Et Milieu-Life and Environment, 70(3–4), 69–76. https://www.webofscience.com/wos/woscc/full-record/WOS:000675537200008 Cite
Gilbert, F., Kristensen, E., Aller, R. C., Banta, G. T., Archambault, P., Belley, R., Bellucci, L. G., Calder, L., Cuny, P., de Montaudouin, X., Eriksson, S. P., Forster, S., Gillet, P., Godbold, J. A., Glud, R. N., Gunnarsson, J., Hulth, S., Lindqvist, S., Maire, A., … Stora, G. (2021). Sediment reworking by the burrowing polychaete Hediste diversicolor modulated by environmental and biological factors across the temperate North Atlantic. A tribute to Gaston Desrosiers. Journal of Experimental Marine Biology and Ecology, 541, 151588. HAL. https://doi.org/10.1016/j.jembe.2021.151588 Cite
Baldrighi, E., Dovgal, I., Zeppilli, D., Abibulaeva, A., Michelet, C., Michaud, E., Franzo, A., Grassi, E., Cesaroni, L., Guidi, L., Balsamo, M., Sandulli, R., & Semprucci, F. (2020). The Cost for Biodiversity: Records of Ciliate-Nematode Epibiosis with the Description of Three New Suctorian Species. Diversity-Basel, 12(6), 224. https://archimer.ifremer.fr/doc/00632/74417/. https://doi.org/10.3390/d12060224 Cite
Ray, R., Thouzeau, G., Walcker, R., Vantrepotte, V., Gleixner, G., Morvan, S., Devesa, J., & Michaud, E. (2020). Mangrove-Derived Organic and Inorganic Carbon Exchanges Between the Sinnamary Estuarine System (French Guiana, South America) and Atlantic Ocean. Journal of Geophysical Research-Biogeosciences, 125(8), e2020JG005739. https://doi.org/10.1029/2020JG005739 Cite
Morata, N., Michaud, E., Poullaouec, M.-A., Devesa, J., Le Goff, M., Corvaisier, R., & Renaud, P. E. (2020). Climate change and diminishing seasonality in Arctic benthic processes. Philosophical Transactions of the Royal Society A-Mathematical Physical and Engineering Sciences, 378(2181), 20190369. https://doi.org/10.1098/rsta.2019.0369 Cite
Brunier, G., Michaud, E., Fleury, J., Anthony, E. J., Morvan, S., & Gardel, A. (2020). Assessing the relationship between macro-faunal burrowing activity and mudflat geomorphology from UAV-based Structure-from-Motion photogrammetry. Remote Sensing of Environment, 241, 111717. https://doi.org/10.1016/j.rse.2020.111717 Cite
Michelet, C., Zeppilli, D., Hubas, C., Baldrighi, E., Cuny, P., Dirberg, G., Militon, C., Walcker, R., Lamy, D., Jézéquel, R., Receveur, J., Gilbert, F., Houssainy, A. E., Dufour, A., Heimbürger-Boavida, L.-E., Bihannic, I., Sylvi, L., Vivier, B., & Michaud, E. (2021). First Assessment of the Benthic Meiofauna Sensitivity to Low Human-Impacted Mangroves in French Guiana. Forests, 12(3), 338. https://doi.org/10.3390/f12030338 Cite
Michaud, E., Aller, R. C., & Stora, G. (2010). Sedimentary organic matter distributions, burrowing activity, and biogeochemical cycling: natural patterns and experimental artifacts. Estuarine, Coastal and Shelf Science, 90(1), 21–34. http://www.sciencedirect.com/science/article/pii/S0272771410002799 Cite
Oleszczuk, B., Michaud, E., Morata, N., Renaud, P. E., & Kedra, M. (2019). Benthic macrofaunal bioturbation activities from shelf to deep basin in spring to summer transition in the Arctic Ocean. Marine Environmental Research, 150, UNSP 104746. https://doi.org/10.1016/j.marenvres.2019.06.008 Cite
Ray, R., Michaud, E., Aller, R. C., Vantrepotte, V., Gleixner, G., Walcker, R., Devesa, J., Le Goff, M., Morvan, S., & Thouzeau, G. (2018). The sources and distribution of carbon (DOC, POC, DIC) in a mangrove dominated estuary (French Guiana, South America). Biogeochemistry, 138(3), 297–321. https://doi.org/10.1007/s10533-018-0447-9 Cite
Aschenbroich, A., Michaud, E., Gilbert, F., Fromard, F., Alt, A., Le Garrec, V., Bihannic, I., De Coninck, A., & Thouzeau, G. (2017). Bioturbation functional roles associated with mangrove development in French Guiana, South America. Hydrobiologia, 794(1), 179–202. https://doi.org/10.1007/s10750-017-3093-7 Cite
Brunier, G., Fleury, J., Anthony, E. J., Pothin, V., Vella, C., Dussouillez, P., Gardel, A., & Michaud, E. (2016). Structure-from-Motion photogrammetry for high-resolution coastal and fluvial geomorphic surveys. Géomorphologie : Relief, Processus, Environnement, 22(2), 147–161. https://doi.org/10.4000/geomorphologie.11358 Cite
Aschenbroich, A., Michaud, E., Stieglitz, T., Fromard, F., Gardel, A., Tavares, M., & Thouzeau, G. (2016). Brachyuran crab community structure and associated sediment reworking activities in pioneer and young mangroves of French Guiana, South America. Estuarine Coastal and Shelf Science, 182, 60–71. https://doi.org/10.1016/j.ecss.2016.09.003 Cite
Berge, J., Daase, M., Renaud, P. E., Ambrose, W. G., Darnis, G., Last, K. S., Leu, E., Cohen, J. H., Johnsen, G., Moline, M. A., Cottier, F., Varpe, O., Shunatova, N., Balazy, P., Morata, N., Massabuau, J.-C., Falk-Petersen, S., Kosobokova, K., Hoppe, C. J. M., … Callesen, T. A. (2015). Unexpected Levels of Biological Activity during the Polar Night Offer New Perspectives on a Warming Arctic. Current Biology, 25(19), 2555–2561. https://doi.org/10.1016/j.cub.2015.08.024 Cite
Morata, N., Michaud, E., & Wlodarska-Kowalczuk, M. (2015). Impact of early food input on the Arctic benthos activities during the polar night. Polar Biology, 38(1), 99–114. https://doi.org/10.1007/s00300-013-1414-5 Cite
Raimonet, M., Andrieux-Loyer, F., Ragueneau, O., Michaud, E., Kérouel, R., Philippon, X., Nonent, M., & Mémery, L. (2013). Strong gradient of benthic biogeochemical processes along a macrotidal temperate estuary: focus on P and Si cycles. Biogeochemistry, 115(1–3), 399–417. http://link.springer.com/article/10.1007/s10533-013-9843-3 Cite

Others publications before 2010

Michaud, E., G. Desrosiers, R. Aller, F. Mermillod-Blondin, B. Sundby, G. Stora. 2009. Spatial interactions in the Macoma balthica community control biogeochemical fluxes at the sediment-water interface and microbial abundances. J. Mar. Res. 61, 1, 43-70. https://doi.org/10.1357/002224009788597926

Gilbert F., Hulth S., Grossi V., Poggiale J-C., Desrosiers G., Rosenberg R., Gérino M., François-Carcaillet F., Michaud E., Stora G. 2007. Sediment reworking activity rates and patterns in some marine benthic species from the Gullmar Fjord (Western Sweden). Importance of faunal biovolume. JEMBE, 348, 1-2, 133-144. https://doi.org/10.1016/j.jembe.2007.04.015

Michaud, E., G. Desrosiers, F. Mermillod-Blondin, B. Sundby, G. Stora. 2006. The functional group approach to bioturbation: II. The effects of the M. balthica community on fluxes of nutrients and dissolved organic carbon across the sediment-water interface. JEMBE, 337: 178-189. https://doi.org/10.1016/j.jembe.2006.06.025

Michaud, E., G. Desrosiers, F. Mermillod-Blondin, B. Sundby, G. Stora. 2005. The functional group approach to bioturbation: The effects of biodiffusers and gallery-diffusers of the M. balthica community on sediment oxygen uptake. JEMBE, Vol. 326, 77-88. https://doi.org/10.1016/j.jembe.2005.05.016

Mermillod-Blondin, S. Marie, G. Desrosiers, B. Long, L. de Montety, E. Michaud, G. Stora. 2003. Assessment of the spatial variability of intertidal benthic communities by axial tomodensitometry: importance of fine-scale heterogeneity. JEMBE, Vol. 287, 193-208. https://doi.org/10.1016/S0022-0981(02)00548-8

Solan, J.D. Germano, D.C. Rhoads, C. Smith, E. Michaud, D. Parry, F. Wenzhöfer, B. Kennedy, C. Henriques, E. Battle, D. Carey, L. Iocco, R. Valente, J. Watson and R. Rosenberg. 2003. Towards a greater understanding of pattern, scale and process in marine benthic systems: a picture is worth a thousand worms. J. Exp. Mar. Biol. Ecol. Vol. 285-286, 313-339. https://doi.org/10.1016/S0022-0981(02)00535-X

Michaud, E., G. Desrosiers, B. Long, L. de Montety, J.F. Crémer, E. Pelletier, J. Locat, F. Gilbert, G. Stora. 2003. Use of axial tomography to follow temporal changes of benthic communities in an unstable sedimentary environment (Ha!Ha! Bay, Saguenay Fjord). J. Exp. Mar. Biol. Ecol.Vol. 285-286, 265-282. https://doi.org/10.1016/S0022-0981(02)00532-4

Desrosiers, G., Gonon, M., de Montety, L., Pelletier, É., Nozais, C., Michaud, E., Stora, G., Long, B., Tremblay, H., Locat, J. 2nd International Symposium on Contaminated Sediments. Québec, Canada, 26-28 mai. Editeur : H. Tremblay, J. Locat, R. Galvez-Cloutier. pp. 78-82

Michaud, E., B. Long, J.F. Crémer, G. Desrosiers, L. de Montety. 2001. Les phases de construction deltaïques, influence d’un apport catastrophique. Canadian Coastal Conference, Quebec, Proceedings. Québec, 16-19 mai. Éditeur : B.F. Long. pp. 533-547.

Books:

E. Michaud, A. Aschenbroich, G. Thouzeau. “La mangrove, l’incontournable du littoral guyanais” in A. Gardel & D. Davy (sous la direction de), Oyapock et Maroni. Portraits d’estuaires amazoniens, Paris, éditions Quæ, Paru le 25 mars 2021. 142 p. ISBN 2759232743

Mangrove, une forêt dans la mer. in F. Fromard, E. Michaud, M. Hossaert-McKey (sous la direction de), Eds Cherche-Midi. Paru le 2 février 2018. 167 p. ISBN 978-2-7491-5764-1

Research networks:

Le groupement de recherche GDR LIGA (Littoral de Guyane sous influence amazonienne) : https://ligagdr.wordpress.com/

International network on the bioturbation studies: Nereis Park: http://nereispark.org/