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Publications (61)
Habitat complexity (HC) promotes species richness and abundance. Aquatic environments are faced with intense pressures that threaten the 3D structure of the seafloor, with cascading effects on ecosystem functioning and biodiversity. Maerl or rhodolith beds are marine biogenic habitats created by few species of free-living non-genicu-late coralline...
Macroalgal communities are essential to coastal ecosystems, yet increasing effects of global change and anthropogenic pressures are leading to their global decline. Investigating the long-term dynamics of these communities across different localities seems crucial to better understand their responses to such pressures, as our knowledge of spatial h...
Coastal zones are biodiversity hotspots and deliver essential ecosystem functions and services, yet they are exposed to multiple and interacting anthropogenic and environmental constraints. The individual and cumulative effects of these constraints on benthic communities, a key component of coastal ecosystems, and their variability across space and...
ABSTRACT: Humans are exposed to toxic methylmercury mainly by consuming marine fish. While reducing mercury emissions and releases aims to protect human health, it is unclear how this affects methylmercury concentrations in seawater and marine biota. We compiled existing and newly acquired mercury concentrations in tropical tunas from the global oc...
Worldwide, ecosystems are suffering important taxonomic and functional modifications in response to anthropogenic disturbances, operating at multiple spatial and temporal scales. Awareness on biodiversity losses has led to the adoption of conservation policies and the development of programs devoted to the conservation and the restoration of terres...
Biodiversity monitoring, essential to detect impacts of natural and anthropogenic changes on marine ecosystems is costly, time-consuming, and requires high taxonomic expertise. Taxonomic surrogacy might be a solution to overcome these problems and accurately reflect species-level community patterns, but its efficiency has mainly been assessed as ta...
Long‐term monitoring programs are fundamental to detect changes in ecosystem health and understand ecological processes. In the current context of increasing anthropogenic threats on marine ecosystems, understanding the dynamics and response of communities becomes essential. We used data collected over 14 years in the REBENT benthic coastal inverte...
Joint Species Distribution Models (jSDM) are increasingly used to explain and predict biodiversity patterns. jSDMs account for species co-occurrence patterns and can include phylogeny or functional traits to better capture the processes shaping communities. Yet, several factors may limit or affect the interpretability and predictive ability of jSDM...
Maerl beds are ecologically important marine biogenic habitats founded on a few species of free-living coralline algae that aggregate and form highly complex rhodoliths. The high biodiversity found in these habitats have been mainly justified by the structural complexity that they provide. However, few attempts to quantify this complexity have been...
The sustainability of mangrove ecosystems requires a knowledge of their spatiotemporal variability as a function of regional properties. The unique coastal ecosystems of the mangrove belt along the coast of the Guianas in South America are influenced by cycles of a massive accretion of mud supplied by the Amazon River and wave induced erosion. This...
Significance
Humans are exposed to toxic methylmercury mainly by consuming marine fish. New environmental policies under the Minamata Convention rely on a yet-poorly-known understanding of how mercury emissions translate into fish methylmercury levels. Here, we provide the first detailed map of mercury concentrations from skipjack tuna across the P...
Intertidal seagrass meadows are exposed to both marine and terrestrial environmental constraints. Seagrass vulnerability to climate changes in these highly dynamic and thermally stressful environments is concerning.
Using broadscale monitoring data covering contrasted intertidal environments, this study aims to provide a comprehensive view of the e...
1. Taxonomic and functional trajectories of benthic assemblages were studied in
shallow soft-bottom sediments in the bay of Saint-Brieuc (Western English
Channel). Changes were assessed at different spatial and temporal scales using a
macrobenthic dataset based on 38 stations sampled in 1987 and 2019, coupled
with data from one station sampled annu...
Tracking and quantifying ecological changes at large and long-term scales is a central point for monitoring and conservation issues. The Community Trajectory Analysis Framework was used in complement with classical methods to analyse and represent long-term changes in marine habitats at 42 stations in the bay of Saint-Brieuc (western English Channe...
Realistic assessments of the ecological status of benthic habitats, as requested by European directives such as the Water Framework Directive and the European Marine Strategy Framework Directive, require biotic indices capable of detecting anthropogenic impact without having preliminary knowledge of the occurring pressures. In this context, a new g...
Ecological research focuses on the spatio-temporal patterns of ecosystems and communities. The recently proposed framework of Community Trajectory Analysis considers community dynamics as trajectories in a chosen space of community resemblance and utilizes geometrical properties of trajectories to compare and analyse temporal changes. Here, we exte...
Aquatic ecologists face challenges in identifying the general rules of the functioning of ecosystems. A common framework, including freshwater, marine, benthic, and pelagic ecologists, is needed to bridge communication gaps and foster knowledge sharing. This framework should transcend local specificities and taxonomy in order to provide a common gr...
Global anthropogenic mercury (Hg) emissions to the atmosphere since industrialization are widely considered to be responsible for a significant increase in surface ocean Hg concentrations. Still unclear is how those inputs are converted into toxic methylmercury (MeHg) then transferred and biomagnified in oceanic food webs. We used a unique long-ter...
Aim: β diversity and its linkages with ecosystem functioning remain poorly docu‐ mented. This impedes our capacity to predict biodiversity changes and how they affect ecosystem functioning at scales relevant for conservation. Here, we address the functional implications of ongoing seafloor changes by characterizing at regional scale the taxonomic a...
Aquatic ecologists face a common challenge: identifying the general rules of the functioning of aquatic ecosystems and developing a more predictive ecological understanding. However, freshwater and marine ecologists traditionally form two distinct scientific communities that barely communicate with each other. A common language is needed to foster...
Agriculture and urbanization have disturbed three-quarters of global ice-free land surface, delivering huge amounts of nitrogen and phosphorus to freshwater ecosystems. These excess nutrients degrade habitat and threaten human food and water security at a global scale. Because most catchments are either currently subjected to, or recovering from an...
Alterations of the seafloor, particularly loss of biogenic habitats, are homogenizing benthic environments and their associated biota. Apprehending the functional consequences of these changes is critical but requires a thorough understanding of the functional β-diversity of benthic communities. Here, using data from 3 years (2007, 2010, 2013) of t...
Alterations of the seafloor, particularly loss of biogenic habitats, are homogenizing benthic environments and their associated biota. Apprehending the functional consequences of these changes is critical but requires a thorough understanding of the functional β-diversity of benthic communities. Here, using data from 3 years (2007, 2010, 2013) of t...
We achieved a long term (i.e., 1998 vs. 2010) large scale (i.e., whole Gulf of Lions) study of benthic macrofauna composition in the Gulf of Lions based on the resampling of 91 stations located along 21 inshore-offshore transects. Results show that the 3 main benthic communities identified in 1998 were still present in 2010 although their compositi...
Relationships between species traits and abiotic gradients, including anthropogenic disturbances, are increasingly assessed to estimate the impacts of changing communities on the functioning of benthic ecosystems. The effects of biogenic habitats on the functional composition of communities have, however, seldom been assessed despite growing concer...
This study aims to describe the patterns of soft bottom macrozoobenthic richness along French coasts. It is based on a collaborative database developed by the “Réseau des Stations et Observatoires Marins” (RESOMAR). We investigated patterns of species richness in sublittoral soft bottom habitats (EUNIS level 3) at two different spatial scales: 1) s...
This study aims to describe the patterns of soft bottom macrozoobenthic richness along French coasts. It is based on a collaborative database developed by the “Réseau des Stations et Observatoires Marins” (RESOMAR). We investigated patterns of species richness in sublittoral soft bottom habitats (EUNIS level 3) at two different spatial scales: 1) s...
Les évaluations de sensibilité ont été réalisées selon la méthodologie décrite précédemment (La Rivière et al., 2015) par un groupe d’experts spécialistes des habitats benthiques, co-auteurs de ce rapport, lors de deux ateliers travail qui se sont déroulés à Brest à l’automne 2016. Elles se basent sur les meilleures connaissances disponibles à ce j...
Seagrasses are ecosystem engineers that create precious habitats providing many valuable ecosystem services, supporting substantial abundances and holding great biodiversity. Yet, they are increasingly threatened by global changes and direct anthropogenic impacts. Conservation efforts to protect and restore these exploited habitats are still lackin...
The French Marine Stations (RESOMAR, CNRS) is the result of a collaborative effort between French marine stations and observatories. One of its aims is to safeguard historical and contemporary datasets related to the benthic compartment of Metropolitan France coastal and littoral ecosystems.
Understanding benthic habitats’ sensitivity to anthropogenic pressures is central to the effective management of the marine environment and to deliver the objectives set out under European Directives (HD, MSFD, WFD). Sensitivity assessments help to:
-identify those pressures that might impede the achievement of good environmental status (or favor
a...
Micronelcton constitutes the largest unexploited marine biomass worldwide. It is one of the most conspicuous and ecologically important components of the still poorly known mesopelagic ecosystem. Acoustic data were collected from both fishing and research vessels along 18 transects for a total of 47 682 linear kilometers to investigate large-scale...
Micronektonconstitutesthelargestunexploitedmarinebiomassworldwide.Itisoneofthemostcon-spicuous andecologicallyimportantcomponentsofthestillpoorlyknownmesopelagicecosystem.Acoustic datawerecollectedfromboth fishing andresearchvesselsalong18transectsforatotalof47682linearkilometerstoinvestigatelarge-scaledistributionofmicronektonoveralonglatitudinalg...
In this work scientific echosounder were used hull mounted onboard R/V Marion Dufresne II to scrutinize the vertical distribution of micronekton according to water masses characteristics along transect which were discriminated with spatial remote sensing data. Acoustic data were collected continuously at 38 kHz frequency during eighteen transits ca...
Sandy beaches, forming the most widespread coastal habitat in the world, are threatened by the effects of increasing anthropogenic pressure in the context of global change, including the increased occurrence of green tides composed of free-living Ulva spp. Sandy beaches are also highly dynamic ecosystems that support numerous essential ecological f...
Sandy beaches, forming the most widespread coastal habitat in the world, are threatened by the effects of increasing anthropogenic pressure in the context of global change, including the increased occurrence of green tides composed of free-living Ulva spp. Sandy beaches are also highly dynamic ecosystems that support numerous essential ecological f...
This review focuses on the analysis of temporal beta diversity, which is the variation in community composition along time in a study area. Temporal beta diversity is measured by the variance of the multivariate community composition time series and that variance can be partitioned using appropriate statistical methods. Some of these methods are cl...
Two-dimensional electrophoresis is a crucial method in proteomics that allows the characterization of proteins' function and expression. This usually implies the identification of proteins that are differentially expressed between two contrasting conditions, for example, healthy vs. diseased in human proteomics biomarker discovery, stressful condit...
Wildland fire is the most important disturbance in Mediterranean ecosystems characterized by endemic yearly drought. Fires act on both the diversity and structure of plant communities. Because Aleppo pine (Pinus halepensis) is closely associated with wildfire, the dynamics of its population could regulate the load of woody debris (WD) during early...
The objective was to describe and model variation patterns in individual fish responses to contaminants among estuaries, season and gender. Two hundred twenty-seven adult European flounders were collected in two seasons (winter and summer) in four estuaries along the Bay of Biscay (South West France), focusing on a pristine system (the Ster), vs. t...
The Mediterranean Sea constitutes a unique environment to study cold-seep ecosystems due to the presence of different geodynamic settings, from an active margin along the Mediterranean Ridge (MR) to a passive margin in the Nile Deep-Sea Fan (NDSF). We attempted to identify the structure of benthic communities associated with the Napoli and Amsterda...
Håkon Mosby mud volcano (HMMV) is one of the most active and most studied seep sites in European waters. Many authors have described its thermal activity, dynamic of mud flows, and geochemical and microbial processes. It is characterised by a concentric zonation of successive biogenic habitats related to an activity and geochemical gradient from it...
Sandy beaches, forming the most widespread coastal habitat in the world, are threatened by the effects of increasing anthropogenic pressure in the context of global change, including the increased occurrence of green tides composed of free-living Ulva spp. Sandy beaches are also highly dynamic ecosystems that support numerous essential ecological f...
Shrubs are an important component of mountain ecosystems in terms of productivity and diversity. The estimate of shrub biomass
via allometric equations represents a non-destructive alternative to obtain quantitative data. We propose allometric equations
to estimate aboveground biomass from easily acquirable descriptive parameters of plant height an...
The Nile Deep-Sea Fan (NDSF) is located on the passive continental margin off Egypt and is characterized by the occurrence
of active fluid seepage such as brine lakes, pockmarks and mud volcanoes. This study characterizes the structure of faunal
assemblages of such active seepage systems of the NDSF. Benthic communities associated with reduced, sul...
A brackish-water cold seep on the North Anatolian Fault (NAF) in the Marmara Sea was investigated with the Nautile submersible during the MarNaut cruise in 2007. This active zone has already been surveyed and revealed evidence of active seeping on the seafloor, such as bubble emissions, patches of reduced sediments, microbial mats and authigenic ca...
Our knowledge of species diversity in deep-sea chemosynthetic communities has come a long way since their discovery in the late 1970s. However, their study poses serious challenges that are linked to their remoteness, the variable selectivity and effectiveness of sampling tools in different conditions, a lack of consensus on the size compartments a...
Phylogenetic relationships among rock-wallabies, Petrogale (Marsupialia: Macropodidae), have proven difficult to resolve. Given the documented interspecific hybridisation in the wild and the ease with which hybrids can be bred in captivity, introgression and hybrid speciation are likely explanations for these difficulties. In this paper, an attempt...
Trophic relationships in Bathymodiolus azoricus mussel bed communities on the Tour Eiffel hydrothermal edifice (Lucky Strike) were assessed using δ13C and δ15N signatures from 14 hydrothermal species. The nutritional basis of B. azoricus was also investigated with δ34S. Faunal samples and environmental data (temperature, pH, total dissolved sulfide...
The occurrence of reticulations in the evolutionary history of species poses serious challenges for all modern practitioners of phylogenetic analysis. Such events, including hybridization, introgression, and lateral gene transfer, lead to evolutionary histories that cannot be adequately represented in the form of phylogenetic trees. Although numero...
Craniometric measurements represent a useful tool for studying the differentiation of mammal populations. However, the fragility
of skulls often leads to incomplete data matrices. Damaged specimens or incomplete sets of measurements are usually discarded
prior to statistical analysis. We assessed the performance of two strategies that avoid elimina...
A growing concern in phylogenetic analysis is our ability to detect events of reticulate evolution (e.g. hybridization) that deviate from the strictly branching pattern depicted by phylogenetic trees. Although algorithms for estimating networks rather than trees are available, no formal evaluation of their ability to detect actual reticulations has...
