A5001047811- Marine and coastal ecosystems
- Radiation Effects and Dosimetry
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Isotope Analysis in Ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Atmospheric and Environmental Gas Dynamics
- Nuclear Physics and Applications
- Marine and fisheries research
- Algal biology and biofuel production
- Water Quality Monitoring Technologies
- Water Quality Monitoring and Analysis
- Atmospheric Ozone and Climate
- Coastal wetland ecosystem dynamics
- Atmospheric chemistry and aerosols
- Environmental DNA in Biodiversity Studies
- Arctic and Antarctic ice dynamics
- Protist diversity and phylogeny
- Air Quality Monitoring and Forecasting
- Polar Research and Ecology
- Mercury impact and mitigation studies
- Cambodian History and Society
Marine Biodiversity Exploitation and Conservation
2015-2024
Université de Montpellier
2011-2024
Centre National de la Recherche Scientifique
2010-2023
Institut de Recherche pour le Développement
2011-2023
Ifremer
2010-2023
Sorbonne Université
2009-2010
Université Paris Cité
2009-2010
Laboratoire d’Océanographie de Villefranche
1996-2009
Institut de la Mer de Villefranche
2000-2001
Université du Québec à Rimouski
1999-2001
Using a sampling grid of 67 stations, the influence basin‐wide and subbasin‐scale circulation features on phytoplankton community composition primary new productions was investigated in eastern Mediterranean during winter. Taxonomic pigments were used as size class markers phototroph groups (picophytoplankton, nanophytoplankton microphytoplankton). Primary production rates computed using light photosynthesis model that makes use total chlorophyll (Tchl ) concentration profile an input...
Phytoplankton blooms are an important, widespread phenomenon in open oceans, coastal waters and freshwaters, supporting food webs essential ecosystem services. Blooms even more important exploited for maintaining high resource production. However, the environmental factors driving shallow productive still unclear, making it difficult to assess how fluctuations influence bloom phenology productivity. To gain insights into phenology, Chl a fluorescence meteorological hydrological parameters...
A rapid reverse-phase HPLC method is presented for the identification and quantification of most phytoplankton pigments. This yields resolution divinyl-chlorophyll a chlorophyll a, as well partial lutein zeaxanthin, b b. In addition, chlorophylls c1,2 c3 are resolved. The analysis time one sample 20 mm, which makes this particularly suited when large numbers samples have to be processed.
The responses of the plankton food web to increases in temperature and ultraviolet B radiation (UVBR, 280–320 nm) were experimentally investigated at a coastal Mediterranean site during spring. Eight moored mesocosms used compare natural (control mesocosms) with three treatments simulating expected future local UVBR increases, as follows: (1) 3°C increase water temperature, (2) 20% incident UVBR, (3) simultaneous UVBR. was resistant elevated having only moderate effects on abundances...
The effects of grazing pressure and inorganic nutrient availability on the direct carbon transfer from freshly produced phytoplankton exudates to heterotrophic bacteria biomass production were studied in Mediterranean coastal waters. short-term incorporation ¹³C (H¹³CO₃) bacterial lipid biomarkers was measured as well total (BP), viral lysis microbial community structure under three experimental conditions: (1) High Nutrient Grazing (HN + HG), (2) Low LG) (3) natural situ conditions with (LN...
Microbial food web organisms are at the base of functioning pelagic ecosystems and support whole marine web. They very reactive to environmental changes their interactions modified in response different productive periods such as phytoplankton bloom non-bloom well contrasted climatic years. To study ecological associations, identify potential between microorganisms structure microbial coastal waters, a weekly monitoring was carried out Thau Lagoon on French Mediterranean coast. The lasted...
Summary Population dynamics in the microbial food web are influenced by resource availability and predator/parasitism activities. Climatic changes, such as an increase temperature and/or UV radiation, can also modify ecological systems many ways. A series of enclosure experiments was conducted using natural communities from a Mediterranean lagoon to assess response top‐down control [grazing heterotrophic nanoflagellates (HNF), viral lysis] bottom‐up (nutrients) under various simulated...
The high Arctic is one of the most sensitive regions to climate warming, which not only increase temperatures but also causes a substantial in freshwater discharge into coastal areas, mainly due accelerated glacier melting. These meltwater runoffs alter physical and chemical conditions water column, reducing light availability, changing spectrum, decreasing salinity, bringing organic inorganic particulate dissolved matter. Effects on structure functioning plankton communities were assessed...
Abstract In recent decades, the increase in terrestrial inputs to freshwater and coastal ecosystems, especially occurring at northern latitudes, has led a process of water color darkening known as “brownification.” To assess how brownification affects plankton community composition functioning areas, an situ mesocosm experiment using highly colored humic substance simulate event was performed North Atlantic bay (Hopavågen, Norway) August 2019. Manual sampling for analyses nutrient...
As heatwaves are expected to increase in frequency and intensity the Mediterranean Sea due global warming, we conducted an situ mesocosm experiment for 20 days during late spring early summer of 2019 a coastal lagoon investigate effects on composition function plankton communities. A heatwave was simulated by elevating water temperature three mesocosms +3°C while control had natural temperature, 10 days. Further, heating procedure halted study resilience recovery system. Automated high...
Abstract The frequency of marine heatwaves (HWs) is projected to increase in the Mediterranean Sea over next decades. An situ mesocosm experiment was performed a lagoon for 33 days. Three mesocosms were used as controls following natural temperature lagoon. In three others, two HWs + 5 °C compared applied from experimental day (d) 1 d5 (HW1) and d11 d15 (HW2). High-frequency data oxygen, chlorophyll- (chl- ), temperature, salinity light sensors immersed all calculate gross primary production...
Introduction While crucial to ensuring the production of accurate and high-quality data—and avoid erroneous conclusions—data quality control (QC) in environmental monitoring datasets is still poorly documented. Methods With a focus on annual inter-laboratory comparison (ILC) exercises performed context French coastal SOMLIT network, we share here pragmatic approach QC, which allows calculation systematic random errors, measurement uncertainty, individual performance. After an overview...
Abstract. Since the beginning of industrial revolution, atmospheric carbon dioxide (CO2) concentrations have risen steadily and induced a decrease averaged surface ocean pH by 0.1 units, corresponding to an increase in acidity about 30 %. In addition warming, acidification poses tremendous challenge some marine organisms, especially calcifiers. The need for long-term oceanic observations temperature is key element assess vulnerability communities ecosystems these pressures. Nearshore...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 145:209-221 (1996) - doi:10.3354/meps145209 Carbon biomass, and gross growth rates as estimated from 14C pigment labelling, during photoacclimation in Prochlorococcus CCMP 1378 Cailliau C, Claustre H, Vidussi F, Marie D, Vaulot D The labelling of chlorophylls carotenoids is increasingly used evaluate...
We report on a new, automatically operated system that can provide accurate simulations of the increases in ultraviolet‐B radiation (UVBR: 280‐320 nm) and temperature predicted by climate change scenarios. The was employed mesocosms using factorial design. originality this is UVBR water are proportional to prevailing ambient levels. In system, 20% increase above natural generated UV lamps, 3°C submersible heating elements, both regulated within very short time scales (0.5 s for 30...
Abstract To investigate the responses of a natural microbial plankton community coastal Mediterranean waters to warming, which are still poorly known, an in situ mesocosm experiment was carried out Thau Lagoon during autumn 2018. Several microorganisms, including virio-, bacterio-, and phytoplankton < 10 µm size, were monitored daily analysed using flow cytometry for 19 consecutive days six mesocosms. Three mesocosms (control) had same water temperature as lagoon, other three warmed by +...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 212:89-105 (2001) - doi:10.3354/meps212089 Bacterial dynamics during transition from spring bloom oligotrophy in northwestern Mediterranean Sea: relationships with particulate detritus and dissolved organic matter France Van Wambeke1,*, Madeleine Goutx1, Laurent Striby1, Richard Sempéré1, Francesca Vidussi2...
Phytoplankton taxonomic pigments were measured by high-performance liquid chromatography (HPLC) during a 3-month survey (AprilJune 1998) in the North Water (NOW) Polynya (Canadian Arctic) to investigate changes phytoplankton biomass and composition physicalchemical factors that influence these changes. A bloom with high chlorophyll (Chl a) concentrations (up 17.45 mg·m 3 at 15 m) occurred mid-May along Greenland coast southeastern part of NOW Polynya. The initiation was linked shallow...