Bruno DEFLANDRE, Ph.D

Assistant professor

Delegation in CNRS (France) over the period 2007-2009

Link to our research team

Mail adress :

! Please your attention, new affiliation from September 1st, 2008 !

UMR CNRS 5805 EPOC
"Environnements et Paléoenvironnements Océaniques et Côtiers"
Université Bordeaux 1
Avenue des Facultés
33405 Talence Cedex - France

Tél. : 33 (0)5 40 00 89 03
Fax : 33 (0)5 56 84 08 48

Email : b.deflandre@epoc.u-bordeaux1.fr

Research Interest

Marine geochemistry, oceanography, aquatic chemistry

Research Topics

My research topics fall under the study of non steady-state diagenetic processes in coastal marine sediments. I am interested in early diagenetic reactions and elemental cycling involving the decomposition of organic matter, dissolution of inorganic biogenic debris, and the behavior and fate of metals sensitive to oxidation-reduction conditions. These reactions are the most intense in the upper few centimeters of marine sediments where, for example, benthic fauna lives and interacts with sediments. The sediment-water interface plays a major role because of the occurrence of intense and variable exchanges of dissolved material between sediment and overlying water. A better knowledge of early diagenetic processes occurring in this zone is therefore essential for understanding elemental cycling in marine sediments. I have a huge interest for the alternative pathways of nitrogen cycle (anaerobic production of nitrate, anammox) and for the effects of sedimentary heterogeneity on the chemistry of marine sediments. My work is different from the former studies on early diagenesis by the attention very particular on its non steady-state nature caused by transient phenomena at different time and spatial scales (e.g. bloom, flood, tidal cycle), and specially at the scales of sedimentary microenvironments resulting mainly from the activity and diversity of the benthic fauna (i.e. bioturbation).

My students and I are currently studying non steady-state diagenetic processes in a variety of coastal marine sediments including Arcachon Lagoon and Mediterranean (France), Thames estuary (UK), and Saguenay fjord (Quebec, Canada).

We have past and ongoing projects with the following IPGP members, Eric Viollier, Didier Jézéquel, and François Prévot, as well as with colleagues from other universities including Antoine Grémare (Univ. of Bordeaux 1), Pierre Anstchutz (Univ. of Bordeaux 1), Jean-Claude Duchêne (CNRS Banyuls sur mer) , Edouard Metzger (Univ. Angers), Audrey Prusky (Univ. Paris 6, Banyuls sur mer), Roseline Buscail (Univ. Perpignan), Franck Gilbert (Univ. of Toulouse), Patricia Bonin (Univ. of Marseille), Mark Trimmer (Univ. London), Alfonso Mucci (McGill Univ.) and Bjørn Sundby (ISMER & McGill Univ.).


Several of our ongoing research projects are listed here (no exhaustive list):

PROTIDAL : Transient biogeochemical processes in an intertidal area : the Arcachon lagoon (2007-2010) French Program « ANR Blanc 2006 »

CHACCRA: Climate and Human-induced Alterations in Carbon Cycling at the River-SeA (2007-2010) French Program « Vulnérabilité : milieux et climat »

RiOMar.fr : Fate of organic matter and nutrients from the Rhône river to coastal Mediterranean (2007) French Program « EC2CO & PNEC»

MESO : Micro-heterogeneity at the sediment-water interface in coastal marine sediments (2004-2006) French Program « PNEC»

Lab team :

- Bruno Deflandre, Ph.D
- Lucie Pastor (Ph.D student)
- Laure Sandoval (Master student, SGE Paris 7)
- Marie Lise Delgard (Master student, OEM Paris 6)

Teaching

- Bachelor's degree of Chemistry, Université Paris Diderot

.Aquatic Chemistry (L2S4)

- Master of Geochemistry, STEP, Université Paris Diderot

.Aquatic Geochemistry (M1S2)

- Master of Sciences and Genius of the Environment (SGE), Université Paris Diderot

.Functioning of the natural and disturbed systems (M1S1)
.Metrology of the Environment (M1S2)

Education

2001 – Philosophiæ Doctor (Ph.D) in Oceanography (Marine Geochemistry) - Université du Québec à Rimouski (Canada) under the supervison of Pr Bjørn Sundby and Pr J.-P. Gagné. Thesis dissertation: “Biogeochemical heterogeneity of coastal marine sediments: from sedimentary microenvironments to Saguenay Fjord Sediments”.

1995 – DEA Meteorology, Oceanography et Environment, (marine Chemistry and biogeochemistry), Université Pierre et Marie Curie Paris 6 (France).

1993 Master of Oceanography, Brest (France).

1992-1990 bachelor's degree of Chemistry, Montpellier II (France)

Positions

2001-2002 Postdoctoral Researcher - School of Biological Sciences, Queen Mary, University of London - United Kingdom. Research Topic funded by Natural Environment Research Council: "Anaerobic cycling of nitrogen in estuarine sediments"

Publications

Mouret A, P. Anschutz, G. Chaillou, C. Hyacinthe, J. Deborde, P. Lecroart, F. Jorissen , B. Deflandre, S. Schmidt, J-M. Jouanneau. Early diagenesis of manganese and the sediment accumulation rate. Accepted in Geo-Marine Letters.

Grémare A., D. Gutiérrez, P. Anschutz, J.-M. Amouroux, B. Deflandre & G. Vétion. 2005. Spatio-temporal changes in totally and enzymatically hydrolysable amino acids of superficial sediments from three contrasted areas. Progress in Oceanography, 65: 89-111.

Trimmer M., J.C. Nichols & B. Deflandre. 2003. Anaerobic ammonium oxidation in sediments along the Thames estuary, UK. Applied and Environmental Microbiology, 69: 6447-6454.

Deflandre B., A. Mucci, J.-P. Gagné, C. Guignard & B. Sundby. 2002. Early diagenetic processes in coastal marine sediments disturbed by a catastrophic sedimentation event. Geochimica et Cosmochimica Acta, 66: 2379-2390.

Deflandre B. & J.-P. Gagné. 2001. Estimation of dissolved organic carbon (DOC) in nanoliter samples using UV spectroscopy. Water Research, 35: 3057-3062.

Gilbert F., G. Stora, G. Desrosiers, B. Deflandre, J.-C. Bertrand, J.-C. Poggiale & J.-P. Gagné. 2001. Alteration and release of aliphatic compounds by the polychaete Nereis virens (Sars) experimentally fed with hydrocarbons. Journal of Experimental Marine Biology and Ecology, 256: 199-213.

Deflandre B., A. Mucci, J.-P. Gagné, C. Guignard, B. Sundby & P. Anschutz. 2000. The 1996 flood event: disruption of the ongoing diagenesis of Saguenay fjord sediments. Proceedings of the fifty-third Canadian Geotechnical Conference, 1: 117-122.

Pelletier É., B. Deflandre, C. Nozais, G. Tita, G. Desrosiers, J-P. Gagné & A. Mucci. 1999 Crue éclair de juillet 1996 dans la région du Saguenay (Québec). 2. Impacts sur les sédiments et le biote de la Baie des Ha! Ha! et du fjord du Saguenay. Canadian Journal of Fisheries and Aquatic Sciences, 56: 2136-2147.

Deflandre B., J.-P. Gagné & G. Desrosiers (1999). Évolution géochimique des sédiments du Fjord du Saguenay (Québec, Canada) depuis la perturbation environnementale de juillet 96. Carrefour des Sciences de la Terre, numéro spécial Déluge du Saguenay de 1996, 23: 6-12.

Gilbert F., G. Stora, G. Desrosiers, J.-P. Gagné, B. Deflandre & J.C. Bertrand. 1998. Changes in aliphatic hydrocarbon tracer composition during the marine worm Nereis virens digestive process. Preliminary results. Chemosphere, 36: 553-560.

Links and downloads

Project MESO - PNEC (2005-2007)

Projet ANR Riomar.fr/CHACCRA (2007-2010)

Projet ANR PROTIDAL (2007-2010)

PrO2flux software