Publications by authors named "M Hugoni"
Article Synopsis
- The study explores the diversity and ecological roles of Woesearchaeota in Lake Dziani Dzaha, revealing their unique genomic features and lifestyles.
- Researchers identified two distinct populations of Woesearchaeota with a bimodal distribution in depth, linked to different chemical environments, indicating their complex interactions within the microbial community.
- The findings challenge existing beliefs about the metabolic dependencies of Woesearchaeota, suggesting they exhibit adaptive lifestyles that contribute significantly to ecosystem dynamics.
Tourism in Paleolithic caves can cause an imbalance in cave microbiota and lead to cave wall alterations, such as dark zones. However, the mechanisms driving dark zone formation remain unclear. Using shotgun metagenomics in Lascaux Cave's Apse and Passage across two years, we tested metabarcoding-derived functional hypotheses regarding microbial diversity and metabolic potential in dark zones vs unmarked surfaces nearby.
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- Saline-alkaline lakes like Dziani Dzaha can support rich biological communities due to specialized phototrophs that adapt to extreme conditions.
- In this lake, a cyanobacterium and a picoeukaryote coexist and exhibit high gene expression related to photosynthesis, even in low light and oxygen levels, with optimal growth occurring just below the surface.
- While the cyanobacterium shows decreasing photosynthesis gene expression with depth, the picoeukaryote maintains high expression levels, indicating its adaptation for survival in low-light environments, along with active fermentation processes in darker depths.
Community assembly processes are complex and understanding them represents a challenge in microbial ecology. Here, we used Lascaux Cave as a stable, confined environment to quantify the importance of stochastic vs deterministic processes during microbial community dynamics across the three domains of life in relation to an anthropogenic disturbance that had resulted in the side-by-side occurrence of a resistant community (unstained limestone), an impacted community (present in black stains), and a resilient community (attenuated stains). Metabarcoding data showed that the microbial communities of attenuated stains, black stains, and unstained surfaces differed, with attenuated stains being in an intermediate position.
View Article and Find Full Text PDFMicroorganisms are key contributors of aquatic biogeochemical cycles but their microscale ecology remains largely unexplored, especially interactions occurring between phytoplankton and microorganisms in the phycosphere, that is the region immediately surrounding phytoplankton cells. The current study aimed to provide evidence of the phycosphere taking advantage of a unique hypersaline, hyperalkaline ecosystem, Lake Dziani Dzaha (Mayotte), where two phytoplanktonic species permanently co-dominate: a cyanobacterium, Arthrospira fusiformis, and a green microalga, Picocystis salinarum. To assay phycospheric microbial diversity from in situ sampling, we set up a flow cytometry cell-sorting methodology for both phytoplanktonic populations, coupled with metabarcoding and comparative microbiome diversity.
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