Christophe Six
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View article: Global Phylogeography of Marine <i>Synechococcus</i> in Coastal Areas Reveals Strong Community Shifts
Global Phylogeography of Marine <i>Synechococcus</i> in Coastal Areas Reveals Strong Community Shifts Open
Synechococcus is the second most abundant phytoplanktonic organism on Earth, and its wide genetic diversity allowed it to colonize all the oceans except for polar waters, with different clades colonizing distinct oceanic niches. In recent …
View article: Global phylogeography of marine <i>Synechococcus</i> in coastal areas reveals strikingly different communities than in the open ocean
Global phylogeography of marine <i>Synechococcus</i> in coastal areas reveals strikingly different communities than in the open ocean Open
Marine Synechococcus comprise a numerically and ecologically prominent phytoplankton group, playing a major role in both carbon cycling and trophic networks in all oceanic regions except in the polar oceans. Despite their high abundance in…
View article: Marine Bacterial Models for Experimental Biology
Marine Bacterial Models for Experimental Biology Open
Bacteria are ubiquitous and abundant in the marine environment, playing a multiplicity of roles in marine ecosystems, and are also a source of multiple biotechnological innovations. The well-characterized strains of Escherichia coli, Staph…
View article: Marine <i>Synechococcus</i> picocyanobacteria: Light utilization across latitudes
Marine <i>Synechococcus</i> picocyanobacteria: Light utilization across latitudes Open
Significance Phytoplankton drives most of the carbon pumping of the world ocean through the photosynthesis process. We show how Synechococcus picocyanobacteria, a very abundant marine phytoplankton, have adapted the light utilization proce…
View article: Dinoflagellate Host Chloroplasts and Mitochondria Remain Functional During Amoebophrya Infection
Dinoflagellate Host Chloroplasts and Mitochondria Remain Functional During Amoebophrya Infection Open
Dinoflagellates are major components of phytoplankton that play critical roles in many microbial food webs, many of them being hosts of countless intracellular parasites. The phototrophic dinoflagellate Scrippsiella acuminata (Dinophyceae)…
View article: Physiology of maerl algae: Comparison of inter‐ and intraspecies variations
Physiology of maerl algae: Comparison of inter‐ and intraspecies variations Open
Free‐living red coralline algae play an important role in the carbon and carbonate cycles of coastal environments. In this study, we examined the physiology of free‐living coralline algae‐forming maerl beds in the Bay of Brest (Brittany, F…
View article: Evolutionary Mechanisms of Long-Term Genome Diversification Associated With Niche Partitioning in Marine Picocyanobacteria
Evolutionary Mechanisms of Long-Term Genome Diversification Associated With Niche Partitioning in Marine Picocyanobacteria Open
Marine picocyanobacteria of the genera Prochlorococcus and Synechococcus are the most abundant photosynthetic organisms on Earth, an ecological success thought to be linked to the differential partitioning of distinct ecotypes into specifi…
View article: Synergic Effects of Temperature and Irradiance on the Physiology of the Marine Synechococcus Strain WH7803
Synergic Effects of Temperature and Irradiance on the Physiology of the Marine Synechococcus Strain WH7803 Open
Understanding how microorganisms adjust their metabolism to maintain their ability to cope with short-term environmental variations constitutes one of the major current challenges in microbial ecology. Here, the best physiologically charac…
View article: Unveiling membrane thermoregulation strategies in marine picocyanobacteria
Unveiling membrane thermoregulation strategies in marine picocyanobacteria Open
Summary The wide latitudinal distribution of marine Synechococcus cyanobacteria partly relies on the differentiation of lineages adapted to distinct thermal environments. Membranes are highly thermosensitive cell components, and the abilit…
View article: Symbiont Chloroplasts Remain Active During Bleaching-Like Response Induced by Thermal Stress in Collozoum pelagicum (Collodaria, Retaria)
Symbiont Chloroplasts Remain Active During Bleaching-Like Response Induced by Thermal Stress in Collozoum pelagicum (Collodaria, Retaria) Open
International audience
View article: A New Freshwater Cyanosiphovirus Harboring Integrase
A New Freshwater Cyanosiphovirus Harboring Integrase Open
Pelagic cyanobacteria are key players in the functioning of aquatic ecosystems, and their viruses (cyanophages) potentially affect the abundance and composition of cyanobacterial communities. Yet, there are few well-described freshwater cy…
View article: Picoeukaryotes of the <i>Micromonas</i> genus: sentinels of a warming ocean
Picoeukaryotes of the <i>Micromonas</i> genus: sentinels of a warming ocean Open
Photosynthetic picoeukaryotesx in the genus Micromonas show among the widest latitudinal distributions on Earth, experiencing large thermal gradients from poles to tropics. Micromonas comprises at least four different species often found i…
View article: A novel species of the marine cyanobacterium Acaryochloris with a unique pigment content and lifestyle
A novel species of the marine cyanobacterium Acaryochloris with a unique pigment content and lifestyle Open
All characterized members of the ubiquitous genus Acaryochloris share the unique property of containing large amounts of chlorophyll (Chl) d , a pigment exhibiting a red absorption maximum strongly shifted towards infrared compared to Chl …
View article: Chloroplasts of symbiotic microalgae remain active during bleaching induced by thermal stress in Collodaria (Radiolaria)
Chloroplasts of symbiotic microalgae remain active during bleaching induced by thermal stress in Collodaria (Radiolaria) Open
Collodaria (Radiolaria) are important contributors to planktonic communities and biogeochemical processes ( e.g. the biologic pump) in oligotrophic oceans. Similarly to corals, Collodaria live in symbiosis with dinoflagellate algae, a rela…
View article: Thermoacclimation and genome adaptation of the membrane lipidome in marine <i>Synechococcus</i>
Thermoacclimation and genome adaptation of the membrane lipidome in marine <i>Synechococcus</i> Open
Summary The marine cyanobacteria of the genus Synechococcus are important primary producers, displaying a wide latitudinal distribution that is underpinned by diversification into temperature ecotypes. The physiological basis underlying th…
View article: Temperature is a key factor in <i>Micromonas</i>–virus interactions
Temperature is a key factor in <i>Micromonas</i>–virus interactions Open
The genus Micromonas comprises phytoplankton that show among the widest latitudinal distributions on Earth, and members of this genus are recurrently infected by prasinoviruses in contrasted thermal ecosystems. In this study, we assessed h…
View article: Adaptive thermostability of light-harvesting complexes in marine picocyanobacteria
Adaptive thermostability of light-harvesting complexes in marine picocyanobacteria Open
Marine Synechococcus play a key role in global oceanic primary productivity. Their wide latitudinal distribution has been attributed to the occurrence of lineages adapted to distinct thermal niches, but the physiological and molecular base…
View article: Central role for ferritin in the day/night regulation of iron homeostasis in marine phytoplankton
Central role for ferritin in the day/night regulation of iron homeostasis in marine phytoplankton Open
Significance Phytoplankton transforms large amounts of inorganic to organic carbon, a critical step in the uptake of atmospheric CO 2 in the ocean. Although iron is essential for this process, its bioavailability is often low. Phytoplankto…