A5051324047- Marine and coastal ecosystems
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Marine Bivalve and Aquaculture Studies
- Ocean Acidification Effects and Responses
- Isotope Analysis in Ecology
- Microbial Community Ecology and Physiology
- Marine animal studies overview
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Arctic and Russian Policy Studies
- Marine and fisheries research
- Toxic Organic Pollutants Impact
- Oil Spill Detection and Mitigation
- Water Quality Monitoring and Analysis
- Algal biology and biofuel production
- Food Industry and Aquatic Biology
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Marine and coastal plant biology
- Geological Studies and Exploration
- Environmental Toxicology and Ecotoxicology
- Mycorrhizal Fungi and Plant Interactions
- Environmental Chemistry and Analysis
- Freezing and Crystallization Processes
Centre National de la Recherche Scientifique
2015-2025
Université de Toulon
2015-2025
Aix-Marseille Université
2015-2025
Laval Mayenne Technopole
2025
Université Laval
2019-2024
University of Manitoba
2022-2023
Institut de Recherche pour le Développement
2015-2022
Institut Méditerranéen d’Océanologie
2014-2022
Université de Bretagne Occidentale
2019-2022
Ifremer
2019-2022
Climate-driven alterations of the marine environment are most rapid in Arctic and subarctic regions, including Hudson Bay northern Canada, where declining sea ice, warming surface waters ocean acidification occurring at alarming rates. These changes altering primary production patterns that will ultimately cascade up through food web. Here, we investigated (i) vertical trophic structure Southampton Island ecosystem Bay, (ii) contribution benthic pelagic-derived prey to higher level species,...
Abstract. The Green Edge initiative was developed to investigate the processes controlling primary productivity and fate of organic matter produced during Arctic phytoplankton spring bloom (PSB) determine its role in ecosystem. Two field campaigns were conducted 2015 2016 at an ice camp located on landfast sea southeast Qikiqtarjuaq Island Baffin Bay (67.4797∘ N, 63.7895∘ W). During both expeditions, a large suite physical, chemical biological variables measured beneath consolidated sea-ice...
Abstract Sea ice primary production is considered a valuable energy source for Arctic marine food webs, yet the extent remains unclear through existing methods. Here we quantify algal carbon signatures using unique lipid biomarkers in over 2300 samples from 155 species including invertebrates, fish, seabirds, and mammals collected across shelves. Ice were present within 96% of organisms investigated, year-round January to December, suggesting continuous utilization this resource despite its...
In spring 2016, the temporal evolution of organic carbon and carbohydrate concentrations was monitored in under sea ice during microalgal–ice algae subsequent phytoplankton–productive periods western Baffin Bay (Canadian Arctic). The results showed that total carbohydrates (TCHO) closely followed carbon, with highest observed bottom-most few centimeters (mean 186 µM C, n = 22). Such matter accumulation likely comprises labile matter, reflecting presence a concentrated algal biomass, as...
In recent years, certain mono- and di-unsaturated highly branched isoprenoid (HBI) alkene biomarkers (i.e., IP25 HBI IIa) have emerged as useful proxies for sea ice in the Arctic Antarctic, respectively. Despite relatively large number of reconstructions based on IIa, considerably fewer studies addressed variability or underlying water column during a spring bloom melt season. this study, we quantified various other HBIs at high temporal vertical resolution (suspended sinking particulate...
Benthic organisms depend primarily on seasonal pulses of organic matter from primary producers. In the Arctic, declines in sea ice due to warming climate could lead changes this food supply with as yet unknown effects benthic trophic dynamics. consumer diets and web structure were studied a seasonally ice-covered region Baffin Bay during spring 2016 at stations ranging depth 199 2,111 m. We used novel combination highly branched isoprenoid (HBI) lipid biomarkers stable isotope ratios (δ13C,...
Abstract. Lipid tracers including fatty acids, hydroxyacids, n-alkanols, sterols and triterpenoids were used to determine the origin fate of suspended particulate organic matter (POM) collected in Rhône River (France). This seasonal survey (April 2011 May 2013) revealed a year-round strong terrestrial higher-plant contribution (POM), with significant algal inputs observed March attributed phytoplanktonic blooms likely dominated by diatoms. Major terrigenous contributors our samples are...
The aim of this paper was to study the effects temperature and irradiance on photodegradation state killed phytoplankton cells. For purpose, cells diatom Chaetoceros neogracilis RCC2022 were irradiated (photosynthetically active radiation) at 36 446 J · s(-1) m(-2) (for same cumulative dose irradiation energy) two temperatures (7°C 17°C). Analyses specific lipid tracers (fatty acids sterols) revealed that low irradiances increased photooxidative damages monounsaturated lipids (i.e.,...
During sea-ice melt in the Arctic, primary production by sympagic (sea-ice) algae can be exported efficiently to seabed if sinking rates are rapid and activities of associated heterotrophic bacteria limited. Salinity stress due melting ice has been suggested account for such low bacterial activity. We further tested this hypothesis analyzing samples sea particles collected from May 18 June 29, 2016, western Baffin Bay as part Green Edge project. applied a method not previously used polar...
The Hudson Bay complex (HBC) is home to numerous indigenous communities that traditionally have relied heavily on its marine resources. nutritional quality and stocks of the entire HBC food web depend in large part phytoplankton production bioactive molecules (long chain polyunsaturated fatty acids carotenoids) their transfer through trophic levels. purpose this study was thus determine which were produced during spring blooms, as well environmental factors driving production. We...
The marine pelagic compartment spans numerous trophic levels and consists of reticulate connections between species from primary producers to iconic apex predators, while the benthic is perceived be simpler in structure comprised only low level species. Here, we challenge this paradigm by illustrating that home a subweb similar complexity realm, including equivalent polar bears: megafaunal-predatory sea stars.
Abstract. The Green Edge project was designed to investigate the onset, life, and fate of a phytoplankton spring bloom (PSB) in Arctic Ocean. lengthening ice-free period warming seawater, amongst other factors, have induced major changes Ocean biology over last decades. Because PSB is at base food chain, it crucial understand how environment will affect it. large multidisciplinary, collaborative bringing researchers technicians from 28 different institutions seven countries together, aiming...
Combining mercury and stable isotope data sets of consumers facilitates the quantification whether contaminant variation in predators is due to diet, habitat use and/or environmental factors. We investigated inter-species total Hg (THg) concentrations, trophic magnification slope between δ15N THg, relationships THg with δ13C δ34S 15 fish four marine mammal species (249 individuals total) coastal Arctic waters. Median concentration muscle varied ranging from 0.08 ± 0.04 μg g-1 dw capelin 3.10...
The estimation of important carbon fluxes in a changing Arctic environment remains challenge, one that could benefit from the development biomarkers distinguish between sympagic (ice-associated) and pelagic organic material. Products 10S-DOX-like lipoxygenase fatty acid cis-trans isomerase (CTI) activity bacteria attached to particulate matter (POM) were proposed previously as potential contribution biota seafloor. To date, neither involved such enzymatic activities nor detection these at...