Johann Lavaud
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View article: Influence of light intensity on the toxicity of herbicides, alone or in mixture, to freshwater phytoplankton
Influence of light intensity on the toxicity of herbicides, alone or in mixture, to freshwater phytoplankton Open
International audience
View article: Light response of karyostrophy in the benthic pennate diatom <i>Pleurosigma strigosum</i> (Bacillariophyceae): A complementary photoprotective process?
Light response of karyostrophy in the benthic pennate diatom <i>Pleurosigma strigosum</i> (Bacillariophyceae): A complementary photoprotective process? Open
Pennate diatoms are an ecologically and evolutionarily successful group of algae, dominating in sedimentary habitats where they form biofilms with high productivity and diversity. Their success has been attributed to directed motility, whi…
View article: Light induced transthylakoidal proton gradient is a key signal driving the downward migration of motile diatoms in sediments
Light induced transthylakoidal proton gradient is a key signal driving the downward migration of motile diatoms in sediments Open
Pennate diatoms are photosynthetic microorganisms capable of directed motility in response to light. In sedimentary habitats, many epipelic pennate diatoms exhibit photophobic migration under high light, a behaviour critical for avoiding p…
View article: Photoperiodic dependent regulation of photosynthesis in the polar diatom Fragilariopsis cylindrus
Photoperiodic dependent regulation of photosynthesis in the polar diatom Fragilariopsis cylindrus Open
Introduction: Polar microalgae are exposed to dramatic seasonal changes in light availability, from continuous summer days to winter nights with rapid changes of the daylength in spring and fall. Under this challenging light climate, large…
View article: <i>Skeletonema marinoi</i> ecotypes show specific habitat‐related responses to fluctuating light supporting high potential for growth under photobioreactor light regime
<i>Skeletonema marinoi</i> ecotypes show specific habitat‐related responses to fluctuating light supporting high potential for growth under photobioreactor light regime Open
Summary Diatoms are a diverse group of phytoplankton usually dominating areas characterized by rapidly shifting light conditions. Because of their high growth rates and interesting biochemical profile, their biomass is considered for vario…
View article: Hypometabolism to survive the long polar night and subsequent successful return to light in the diatom <i>Fragilariopsis cylindrus</i>
Hypometabolism to survive the long polar night and subsequent successful return to light in the diatom <i>Fragilariopsis cylindrus</i> Open
Summary Diatoms, the main eukaryotic phytoplankton of the polar marine regions, are essential for the maintenance of food chains specific to Arctic and Antarctic ecosystems, and are experiencing major disturbances under current climate cha…
View article: Potential for the Production of Carotenoids of Interest in the Polar Diatom Fragilariopsis cylindrus
Potential for the Production of Carotenoids of Interest in the Polar Diatom Fragilariopsis cylindrus Open
Carotenoid xanthophyll pigments are receiving growing interest in various industrial fields due to their broad and diverse bioactive and health beneficial properties. Fucoxanthin (Fx) and the inter-convertible couple diadinoxanthin–diatoxa…
View article: Shifts in growth light optima among diatom species support their succession during the spring bloom in the Arctic
Shifts in growth light optima among diatom species support their succession during the spring bloom in the Arctic Open
Diatoms of the Arctic Ocean annually experience extreme changes of light environment linked to photoperiodic cycles and seasonal variations of the snow and sea‐ice cover extent and thickness which attenuate light penetration in the water c…
View article: The Fucoxanthin Chlorophyll a/c-Binding Protein in Tisochrysis lutea: Influence of Nitrogen and Light on Fucoxanthin and Chlorophyll a/c-Binding Protein Gene Expression and Fucoxanthin Synthesis
The Fucoxanthin Chlorophyll a/c-Binding Protein in Tisochrysis lutea: Influence of Nitrogen and Light on Fucoxanthin and Chlorophyll a/c-Binding Protein Gene Expression and Fucoxanthin Synthesis Open
We observed differences in lhc classification in Chromista. We proposed a classification of the lhcf family with two groups specific to haptophytes, one specific to diatoms, and one specific to seaweeds. Identification and characterization…
View article: Content in fatty acids and carotenoids in phytoplankton blooms during the seasonal sea ice retreat in Hudson Bay complex, Canada
Content in fatty acids and carotenoids in phytoplankton blooms during the seasonal sea ice retreat in Hudson Bay complex, Canada Open
The Hudson Bay complex (HBC) is home to numerous indigenous communities that traditionally have relied heavily on its marine resources. The nutritional quality and stocks of the entire HBC food web depend in large part on the phytoplankton…
View article: Mapping the Intertidal Microphytobenthos Gross Primary Production, Part II: Merging Remote Sensing and Physical-Biological Coupled Modeling
Mapping the Intertidal Microphytobenthos Gross Primary Production, Part II: Merging Remote Sensing and Physical-Biological Coupled Modeling Open
Microphytobenthos (MPB) at the sediment surface of intertidal mudflats are known to show a high spatial and temporal variability in response to the biotic and abiotic conditions prevailing at the mud surface. It makes long-term and large-s…
View article: Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms
Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms Open
Over the seasons, Arctic diatom species occupy shifting habitats defined by contrasting light climates, constrained by snow and ice cover dynamics interacting with extreme photoperiod and solar angle variations. How Arctic diatom photoadap…
View article: Mapping the Intertidal Microphytobenthos Gross Primary Production Part I: Coupling Multispectral Remote Sensing and Physical Modeling
Mapping the Intertidal Microphytobenthos Gross Primary Production Part I: Coupling Multispectral Remote Sensing and Physical Modeling Open
The gross primary production (GPP) of intertidal mudflat microphytobenthos supports important ecosystem services such as shoreline stabilization and food production, and it contributes to blue carbon. However, monitoring microphytobenthos …
View article: The Vertical Migratory Rhythm of Intertidal Microphytobenthos in Sediment Depends on the Light Photoperiod, Intensity, and Spectrum: Evidence for a Positive Effect of Blue Wavelengths
The Vertical Migratory Rhythm of Intertidal Microphytobenthos in Sediment Depends on the Light Photoperiod, Intensity, and Spectrum: Evidence for a Positive Effect of Blue Wavelengths Open
Estuarine intertidal flats strong biological productivity is mainly based on the activity of benthic microalgae communities or microphytobenthos (MPB), mostly dominated by diatoms. Epipelon is a major MPB growth form comprising motile spec…
View article: Light Regulation of LHCX Genes in the Benthic Diatom Seminavis robusta
Light Regulation of LHCX Genes in the Benthic Diatom Seminavis robusta Open
Intertidal benthic diatoms experience a highly variable light regime, which especially challenges these organisms to cope with excess light energy during low tide. Non-photochemical quenching of chlorophyll fluorescence (NPQ) is one of the…
View article: Genome-Scale Metabolic Reconstruction and in Silico Perturbation Analysis of the Polar Diatom Fragilariopsis cylindrus Predicts High Metabolic Robustness
Genome-Scale Metabolic Reconstruction and in Silico Perturbation Analysis of the Polar Diatom Fragilariopsis cylindrus Predicts High Metabolic Robustness Open
Diatoms are major primary producers in polar environments where they can actively grow under extremely variable conditions. Integrative modeling using a genome-scale model (GSM) is a powerful approach to decipher the complex interactions b…
View article: Green Edge ice camp campaigns: understanding the processes controlling the under-ice Arctic phytoplankton spring bloom
Green Edge ice camp campaigns: understanding the processes controlling the under-ice Arctic phytoplankton spring bloom Open
The Green Edge initiative was developed to investigate the processes controlling the primary productivity and fate of organic matter produced during the Arctic phytoplankton spring bloom (PSB) and to determine its role in the ecosystem. Tw…
View article: Complete DATASET_Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms
Complete DATASET_Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms Open
Over the seasons, Arctic diatom species occupy shifting habitats defined by contrasting light climates, constrainedby snow and ice cover dynamics interacting with extreme photoperiod and solar angle variations. HowArctic diatom photoadapta…
View article: Response of the sea‐ice diatom<i>Fragilariopsis cylindrus</i>to simulated polar night darkness and return to light
Response of the sea‐ice diatom<i>Fragilariopsis cylindrus</i>to simulated polar night darkness and return to light Open
Arctic photoautotrophic communities must survive through polar night darkness until light returns in spring. We tracked changes in the cellular resource allocations and functional capacities of a polar sea‐ice diatom, Fragilariopsis cylind…