A5039372083- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Molecular Communication and Nanonetworks
- Isotope Analysis in Ecology
- Microbial Metabolic Engineering and Bioproduction
- Bacterial biofilms and quorum sensing
- bioluminescence and chemiluminescence research
- Genomics and Phylogenetic Studies
- Microplastics and Plastic Pollution
Institut de Recherche pour le Développement
2021-2024
Centre National de la Recherche Scientifique
2021-2024
Institut Méditerranéen d’Océanologie
2019-2024
Aix-Marseille Université
2021-2024
Université de Toulon
2021-2024
Stanford University
2024
Abstract The vertical flux of marine snow particles significantly reduces atmospheric carbon dioxide concentration. In the mesopelagic zone, a large proportion organic carried by sinking dissipates thereby escaping long term sequestration. Particle associated prokaryotes are largely responsible for such loss. However, links between this important ecosystem and ecological processes as community development on different particle fractions (sinking vs. non-sinking) yet virtually unknown. This...
Marine particles are key to the cycling of major elements on Earth and play an important role in balance nutrients ocean. Three main categories marine link different parts open ocean by shaping carbon distribution: (i) sinking; (ii) suspended, (iii) ascending. Atmospheric captured phytoplankton surface water, is partly sequestered sinking bottom plays controlling global climate. Suspended represent a significant source organic for heterotrophic microorganisms more likely undergo...
Bacterial-bioluminescence regulation is often associated with quorum sensing. Indeed, many studies have been made on this subject and indicate that the expression of light-emission-involved genes density-dependent. However, most these concerned two model species, A. fischeri V.campbellii. Very few works done bioluminescence for other bacterial genera. Yet, according to large variety habitats luminous marine bacteria, it would not be surprising find different light-regulation systems. In...
Archaea DPANN* superphylum harbors, to date, 12 phyla including Nanoarchaeota and Candidatus Aenigmarchaeota (previously described as DHVE-3, DSEG VAL III). Interestingly, DPANN are detected in a wide range of anoxic or oxygen limited environments such lakes, marine sediments hydrothermal systems. Most known core biosynthetic pathways also absent incomplete Archaea, suggesting symbiotic parasitic lifestyles. However, much the knowledge about their ecology, evolution, putative metabolism...
Abstract Determining mesopelagic organic carbon budgets is essential to characterize the ocean's role as a dioxide sink. This because biological processes observed in zone are crucial for understanding pump. Yet, field assessments of often unbalanced with demand exceeding its supply. underlines either methodological issues budget calculations or incomplete knowledge cycling potentially missing sources. Carbon built by partitioning ocean into vertical depth zones. Vertical boundaries...
Marine particles are key to the cycling of major elements on Earth and play an important role in balance nutrients ocean. Three main categories ofmarine link different parts open ocean by shaping carbon distribution: (i) sinking; (ii) suspended, (iii) ascending. Atmospheric carboncaptured phytoplankton surface water, is partly sequestered sinking bottom plays controlling globalclimate. Suspended represent a significant source organic for heterotrophic microorganisms more likely undergo...
Abstract. Through the constant rain of sinking marine particles in ocean, carbon (C) trapped within is exported into water column and sequestered when reaching depths below mesopelagic zone. Atmospheric CO2 levels are thereby strongly related to magnitude export fluxes Sinking represent main source energy for organisms, attenuating C flux along column. Attempts quantify amount versus consumed by heterotrophic organisms have increased recent decades. Yet, most conducted estimations led...
Abstract Urea is hypothesized to be an important source of nitrogen and chemical energy microorganisms in the deep sea; however, direct evidence for urea use below epipelagic ocean lacking. Here, we explore utilization from 50 4000 meters depth northeastern Pacific Ocean using metagenomics, nitrification rates, single-cell stable-isotope-uptake measurements with nanoscale secondary ion mass spectrometry (nanoSIMS). We find that majority (>60%) active cells across all samples assimilated...
We investigated spatiotemporal variations of nutrients, dissolved organic pools (C, N, P), phosphomonoesterase (PME) and phosphodiesterase (PDE) activities, heterotrophic prokaryotic production planktonic microorganisms within the mixed layer (ML) in Eastern Mediterranean Sea. characterized two contrasted situations: autumn 2018 (highly stratified period, deep chlorophyll maximum 100 m depth) winter 2019 (including a bloom period). compared distribution biogeochemical variables hydrological...
Urea is hypothesized to be an important source of nitrogen and chemical energy microorganisms in the deep sea; however, direct evidence for urea use below epipelagic ocean lacking. Here, we explore utilization from 50 4000 meters depth northeastern Pacific Ocean using metagenomics, nitrification rates, single-cell stable-isotope-uptake measurements with nanoscale secondary ion mass spectrometry. We find that on average 25% deep-sea cells assimilated urea-derived N (60% detectably active...
Abstract The ocean–atmosphere exchange of carbon largely depends on the balance between export particulate organic (POC) as sinking marine particles, and POC remineralization by attached microbial communities. Despite vast spectrum types, sources, ages, shapes, composition individual they are usually considered a bulk together with their associated This limits our mechanistic understanding biological pump (BCP) its feedback global cycle. We established method to sample particles while...
Abstract. Through the constant rain of sinking marine particles in ocean, carbon (C) trapped within is exported into water column and sequestered when reaching depths below mesopelagic zone. Atmospheric CO2 levels are thereby strongly related to magnitude export fluxes Sinking represent main source energy for organisms, attenuating C flux along column. Attempts quantify amount versus consumed by heterotrophic organisms have increased recent decades. Yet, most conducted estimations led...