Nicolas Henry
A5080540002- Microbial Community Ecology and Physiology
- Environmental DNA in Biodiversity Studies
- Protist diversity and phylogeny
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Coral and Marine Ecosystems Studies
- Geological Studies and Exploration
- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Marine and coastal plant biology
- Genomics and Phylogenetic Studies
- Identification and Quantification in Food
- Coastal wetland ecosystem dynamics
- Archaeology and Natural History
- Radiomics and Machine Learning in Medical Imaging
- Indigenous Studies and Ecology
- Arctic and Antarctic ice dynamics
- Bacteriophages and microbial interactions
- Genetic diversity and population structure
- Isotope Analysis in Ecology
- Plant Virus Research Studies
- Parasitic Infections and Diagnostics
- Underwater Vehicles and Communication Systems
- Marine Ecology and Invasive Species
- Diatoms and Algae Research
Station Biologique de Roscoff
2015-2025
Centre National de la Recherche Scientifique
2015-2025
Sorbonne Université
2015-2025
Adaptation et Diversité en Milieu Marin
2019-2022
Laboratoire d’Océanographie de Villefranche
2021
Centre Hospitalier Universitaire d'Angers
2020
Laboratoire des Sciences de l'Environnement Marin
2014
Institut Universitaire Européen de la Mer
2014
Marine plankton support global biological and geochemical processes. Surveys of their biodiversity have hitherto been geographically restricted not accounted for the full range size. We assessed eukaryotic diversity from 334 size-fractionated photic-zone communities collected across tropical temperate oceans during circumglobal Tara Oceans expedition. analyzed 18S ribosomal DNA sequences intermediate plankton-size spectrum smallest unicellular eukaryotes (protists, >0.8 micrometers) to small...
Species interaction networks are shaped by abiotic and biotic factors. Here, as part of the Tara Oceans project, we studied photic zone interactome using environmental factors organismal abundance profiles found that incomplete predictors community structure. We associations across plankton functional types phylogenetic groups to be nonrandomly distributed on network driven both local global patterns. identified interactions among grazers, primary producers, viruses, (mainly parasitic)...
The ocean is home to myriad small planktonic organisms that underpin the functioning of marine ecosystems. However, their spatial patterns diversity and underlying drivers remain poorly known, precluding projections responses global changes. Here we investigate latitudinal gradients predictors plankton across archaea, bacteria, eukaryotes, major virus clades using both molecular imaging data from Tara Oceans. We show a decline for most groups toward poles, mainly driven by decreasing...
Remote deep-ocean sediment (DOS) ecosystems are among the least explored biomes on Earth. Genomic assessments of their biodiversity have failed to separate indigenous benthic organisms from sinking plankton. Here, we compare global-scale eukaryotic DNA metabarcoding datasets (18S-V9) abyssal and lower bathyal surficial sediments euphotic aphotic ocean pelagic layers distinguish plankton diversity in material. Based 1685 samples collected throughout world ocean, show that DOS is at threefold...
A global photic-ocean plankton ecological network predicts distinct vulnerabilities to environmental change across marine biomes.
The biological carbon pump, in which fixed by photosynthesis is exported to the deep ocean through sinking, a major process Earth's cycle. proportion of primary production that termed export efficiency (CEE). Based on in-lab or regional scale observations, viruses were previously suggested affect CEE (i.e., viral "shunt" and "shuttle"). In this study, we tested associations between community composition measured at global scale. A regression model based relative abundance marker genes...
Biogeographical studies have traditionally focused on readily visible organisms, but recent technological advances are enabling analyses of the large-scale distribution microscopic whose biogeographical patterns long been debated. Here we assessed global structure plankton geography and its relation to biological, chemical, physical context ocean (the ‘seascape’) by analyzing metagenomes communities sampled across oceans during Tara Oceans expedition, in light environmental data current...
Phytoplankton account for >45% of global primary production, and have an enormous impact on aquatic food webs the entire Earth System. Their members are found among prokaryotes (cyanobacteria) multiple eukaryotic lineages containing chloroplasts. Genetic surveys phytoplankton communities generally consist PCR amplification bacterial (16S), nuclear (18S) and/or chloroplastic (16S) rRNA marker genes from DNA extracted environmental samples. However, our appreciation abundance or biomass is...
Coral reefs are among the most diverse ecosystems on Earth. They support high biodiversity of multicellular organisms that strongly rely associated microorganisms for health and nutrition. However, extent coral reef microbiome diversity its distribution at oceanic basin-scale remains to be explored. Here, we systematically sampled 3 morphotypes, 2 fish species, planktonic communities in 99 from 32 islands across Pacific Ocean, assess composition biogeography. We show a very large richness...
ABSTRACT The nature and extent of diversity in the plankton has fascinated scientists for over a century. Initially, discovery many new species remarkably uniform unstructured pelagic environment appeared to challenge concept ecological niches. Later, it became obvious that only fraction had been formally described, because assemblages are dominated by understudied eukaryotic lineages with small size lack clearly distinguishable morphological features. high confirmed comprehensive...
The study of protistan functional diversity is crucial to understand the dynamics oceanic ecological processes. We combined metabarcoding data various coastal ecosystems and a newly developed trait-based approach link between taxonomic across marine communities different size-classes. Environmental DNA was extracted V4 18S rDNA genomic region amplified sequenced. In parallel, we tried annotate operational units (OTUs) from our dataset 30 biological traits using published accessible...
Abstract Ocean plankton comprise organisms from viruses to fish larvae that are fundamental ecosystem functioning and the provision of marine services such as fisheries CO 2 sequestration. The latter partly governed by variations in community composition expression traits body size at community-level. While assembly has been thoroughly studied for smaller end spectrum, larger comprises ectotherms often species, or group-level, rather than communities. decreases with temperature, but controls...
Abstract Despite representing one of the largest biomes on earth, biodiversity deep seafloor is still poorly known. Environmental DNA metabarcoding offers prospects for fast inventories and surveys, yet requires standardized sampling approaches careful choice environmental substrate. Here, we aimed to optimize genetic assessment prokaryote (16S), protistan (18S V4), metazoan V1–V2, COI) communities, by evaluating strategies sediment aboveground water, deployed simultaneously at deep-sea...
Abstract Major seasonal community reorganizations and associated biomass variations are landmarks of plankton ecology. However, the processes turnover rates have not been fully elucidated so far. Here, we analyse patterns planktonic protist succession in temperate latitudes, based on quantitative taxonomic data from both microscopy counts (cells >10 μm) ribosomal DNA metabarcoding (size fraction >3 μm, 18S rRNA gene) samples collected bimonthly over 8 years (2009–2016) at SOMLIT‐Astan...
Summary paragraph Plankton are essential in marine ecosystems. However, our knowledge of overall community structure is sparse due to inconsistent sampling across their very large organismal size range. Here we use diverse imaging methods establish complete plankton inventories organisms spanning five orders magnitude size. and trophic variation validate a long-held theoretical link between organism size-spectra ecosystem structures. We found that predator/grazer biomass biovolume...
Abstract Biogeographical studies have traditionally focused on readily visible organisms, but recent technological advances are enabling analyses of the large-scale distribution microscopic whose biogeographical patterns long been debated. Here we assessed global structure plankton geography and its relation to biological, chemical physical context ocean (the ‘seascape’) by analyzing metagenomes communities sampled across oceans during Tara Oceans expedition, in light environmental data...
Abstract The Ocean Barcode Atlas (OBA) is a user friendly web service designed for biologists who wish to explore the biodiversity and biogeography of marine organisms locked in otherwise difficult mine planetary scale DNA metabarcode data sets. Using just browser, comprehensive picture diversity taxon or barcode sequence visualized graphically on world maps interactive charts. Interactive results panels allow dynamic threshold adjustments display their environmental context measured at time...
The Arctic Ocean (AO) is being rapidly transformed by global warming, but its biodiversity remains understudied for many planktonic organisms, in particular unicellular eukaryotes that play pivotal roles marine food webs and biogeochemical cycles. aim of this study was to characterize the biogeographic ranges species comprise contemporary pool AO as a first step toward understanding mechanisms structure these communities identifying potential target monitoring. Leveraging Tara Oceans DNA...
Abstract While a rich history of patchiness research has explored spatial structure in the ocean, there is no consensus over controls on biological and how physical-ecological-biogeochemical processes relate. The prevailing thought that physics structures biology, but this not been tested at basin scale with consistent situ measurements. Here we use slope relationship between variance vs to quantify ~650,000 nearly continuous ( dx ~ 200 m) measurements - representing Atlantic, Pacific,...
Abstract Diatoms constitute one of the most diverse and ecologically important phytoplankton groups, yet their large-scale diversity patterns drivers abundance are unclear due to limited observations. Here, we utilize Tara Oceans molecular morphological data, spanning pole pole, describe marine diatom diversity, abundance, environmental adaptation acclimation strategies. The dominance diatoms among in terms relative is confirmed, prevalent genera Chaetoceros , Thalassiosira Actinocyclus...
The abyssal seafloor covers more than 50% of planet Earth and is a large reservoir still mostly undescribed biodiversity. It increasingly targeted by resource-extraction industries yet drastically understudied. In such remote hard-to-access ecosystems, environmental DNA (eDNA) metabarcoding useful efficient tool for studying biodiversity implementing impact assessments. Yet, eDNA analysis outcomes may be biased towards describing past rather present communities as sediments contain both...