Nicolas Desroy

Nicolas Desroy
Institut Français de Recherche pour l'Exploitation de la Mer | Ifremer · Observation and Dynamics of Ecosystems

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132
Publications
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Publications

Publications (132)
Chapter
Estuarine and coastal waters are acknowledged centres for anthropogenic impacts. Superimposed on the complex natural interactions between land, rivers and sea are the myriad consequences of human activity – a spectrum ranging from locally polluting effluents to some of the severest consequences of global climate change. For practitioners, academics...
Article
Full-text available
Assessing fluxes of matter and energy in food webs within and across benthic habitats is important to understand the ecological functioning in bays and estuaries, where the productivity is favoured by a wide diversity of primary producers. The temporal variability (March vs September 2019) in the carbon and nitrogen stable isotope composition of pr...
Article
Full-text available
Ecologists working with stable isotopes have to deal with complex datasets includ-ingtemporalandspatialreplication,which makes the analysis and the representa-tion of patterns of change challenging, especially at high resolution. Due to the lackof a commonly accepted conceptual framework in stable isotope ecology, the analy-sis and the graphical re...
Article
A traditional taxonomic approach coupled to a biological traits analysis was conducted in order to provide a new insight into macrobenthic communities associated with subtidal sandy environments. Results suggest that the macro-scale distribution of benthic communities is mainly driven by the migration rate of bedforms (sandbank, barchan dune and tr...
Article
Full-text available
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...
Article
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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...
Article
Full-text available
Assessing the sustainability of socio-ecological systems requires understanding the interactions between numerous ecological, economic and social components. Models are often used to investigate how interactions shape system feedbacks and drive the complex dynamics at play in such systems. However, building these models is a non-trivial exercise, w...
Article
Full-text available
Reef-building species are recognized as having an important ecological role and as generally enhancing the diversity of benthic organisms in marine habitats. However, although these ecosystem engineers have a facilitating role for some species, they may exclude or compete with others. The honeycomb worm Sabellaria alveolata (Linnaeus, 1767) is an i...
Article
Most studies about benthic community use small-scale sampling methods focused on the infauna such as grabs or box-corers. The benthic data collected by scientific trawl surveys in all European waters, in the frame of the Common Fishery Policy Data Collection Multiannual Program, can be used to study the impact of large-scale fisheries such as trawl...
Article
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With the widespread influence of human activities on marine ecosystems, evaluation of ecological status provides valuable information for conservation initiatives and sustainable development. To this end, many environmental indicators have been developed worldwide and there is a growing need to evaluate their performance by calculating ecological s...
Article
Ecosystem engineering is a ubiquitous process by which the biological activity of a species shapes habitat diversity and often creates local biodiversity hotspots. The honeycombworm Sabellaria alveolata, an intertidal ecosystem engineer, actively builds reefs across Europe by aggregating sand. Here, we used carbon and nitrogen isotopic compositions...
Article
Full-text available
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...
Article
Full-text available
By relating observed changes to the pressures suffered, the Marine Strategy Framework Directive intends to better control the factors of environmental degradation and to manage their consequences in European waters. Several descriptors are defined within the framework of the MFSD and in particular descriptor 1 relating to the biological diversity o...
Article
Full-text available
The benthic fauna of European continental shelves is a severely impacted community, mostly due to intense bottom trawling activity. Trawling effect may be dependent on the spatial and temporal distribution of abrasion, the habitat type including natural perturbation intensity and the fishing gear used. Nonetheless, there is an urgent need to identi...
Article
Full-text available
An increasing number of offshore structures are being deployed worldwide to meet the growing demand for renewable energy. Besides energy production, these structures can also provide new artificial habitats to a diversity of fish and crustacean species. This study characterises how concrete mattresses that stabilise the submarine power cable of a t...
Article
Full-text available
Succession in epibenthic communities on artificial reefs associated with marine renewable energy facilities within a tide-swept environment. Although colonization of artificial structures by epibenthic communities is well-documented overall, our understanding of colonization processes is largely limited to low-energy environments. In this study, we...
Article
Reef-building species play key roles in promoting local species richness and regulating ecosystem functions like biogeochemical fluxes. We evaluated the functioning of a habitat engineered by the reef-building polychaete Sabellaria alveolata, by measuring oxygen and nutrient fluxes in the reef structures and in the soft-sediments nearby. Then, we i...
Article
Full-text available
1 There is concern across the International Council for the Exploration of the Sea (ICES) region that a consideration of vulnerable components and the wider support mechanisms underpinning benthic marine ecosystems may be lacking from the process of marine protected area (MPA) designation, management and monitoring. 2 In this study, MPAs across si...
Article
In the English Channel, the eastern Bay of Seine is exposed to numerous anthropogenic disturbances, in particular major changes in sediment dynamics, which are expected to greatly impact benthic communities. To assess the long-term effects of these stressors on the muddy fine sand benthic community, an original long-term monitoring program has been...
Article
Bioturbation is one of the key mediators of biogeochemical processes in benthic habitats that can have a high contribution to seafloor functioning and benthic pelagic coupling in coastal waters. Previous studies on bio-turbation were limited to point locations and extrapolations in single regions, but have not accounted for regional differences und...
Article
Full-text available
Underwater imagery is increasingly used as an effective and repeatable method to monitor benthic ecosystems. Nevertheless, extracting ecologically relevant information from a large amount of raw images remains a time-consuming and somewhat laborious challenge. Thus, underwater imagery processing needs to strike a compromise between time-efficient i...
Article
Ecosystem engineering is a ubiquitous process by which the biological activity of a species shapes habitat diversity and often creates local biodiversity hotspots. The honeycomb-worm Sabellaria alveolata, an intertidal ecosystem engineer, actively builds reefs across Europe by aggregating sand. Here, we used carbon and nitrogen isotopic composition...
Article
Full-text available
The number of submarine power cables using either direct or alternating current is expected to increase drastically in coming decades. Data concerning the impact of magnetic fields generated by these cables on marine invertebrates are scarce. In this context, the aim of this study was to explore the potential impact of anthropogenic static and time...
Book
Full-text available
Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du Monde, ses conditions hydrodynamiques qui l’is...
Book
Full-text available
https://hal.archives-ouvertes.fr/hal-02490360 Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du...
Book
Full-text available
https://hal.archives-ouvertes.fr/hal-02490428 Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du...
Book
Full-text available
https://hal.archives-ouvertes.fr/hal-02490480 Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du...
Book
Full-text available
https://hal.archives-ouvertes.fr/hal-02490404 Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du...
Book
Full-text available
https://hal.archives-ouvertes.fr/hal-02490465 Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du...
Book
Full-text available
https://hal.archives-ouvertes.fr/hal-02472438 Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du...
Book
Full-text available
https://hal.archives-ouvertes.fr/hal-02490332 Couvrant plus de 14.000 km2, le golfe Normano-Breton est représentatif de nombreux littoraux européens où s’exercent de multiples pressions anthropiques (pêche, aquaculture, tourisme, etc.). Mais il est aussi original à plusieurs titres, de par son régime de marée mégatidal parmi les plus importants du...
Presentation
Full-text available
With the development of coastal human activities comes the growing need to develop methods to describe and predict their cumulative impacts on marine benthic communities locally, which rank among the most vulnerable communities in marine ecosystems. Local assessments facilitate dialogue between multiple users of the ecosystem (industries, individua...
Poster
Full-text available
Submarine power cables (SPC) are increasingly used worldwide for numerous applications: to connect autonomous grids, supply power to islands, marine platforms or subsea observatories, and to convey power generated by marine renewable energy installations. The electrical current passing through SPC generates magnetic fields (MF, measured in μT), whi...
Poster
Full-text available
This poster compiles works done during my PhD. chapters 2 and 3, and was presented during the 16th scientific assembly of Québec-Océan and the 3rd Canadian Healthy Oceans Network II's meeting at Ottawa. This poster won the Best Poster Award.
Article
Species ranges are shifting globally to track temperature changes in response to climate warming, with substantial variability among taxa. In the English Channel, a biogeographical transition zone between the cold temperate and warm temperate provinces of the North-East Atlantic, distribution shifts have been relatively well documented for plankton...
Article
Full-text available
Artificial structures in ports are commonly colonized by non-indigenous epifauna that tolerate high pollution levels. Bioconstructions built by alien species may offer sheltered microhabitats for motile (vagile) animals but biofouling often becomes detrimental to human activities. In this context, the present study provides an inventory of 1) the e...
Article
Full-text available
The complexity and scales of the processes that shape communities of marine benthic macroinvertebrates has limited our understanding of their assembly mechanisms and the potential to make projections of their spatial and temporal dynamics. Individual-based models can shed light on community assembly mechanisms, by allowing observed spatiotemporal p...
Data
Code and data used to run the models. Models subtidal and intertidal are the fine-scale models of the subtidal and the intertidal zone, respectively. Model rance is the coarse-scale model. The folders sed and ls contain the GIS substrate data and the LevelSpace extension, respectively.
Data
Data and code. List of species and their classification. ODD description of the fine-scale model. Observed functional group abundances. Source code of the NetLogo models. Model output of the benchmark simulation.
Technical Report
Full-text available
WGELECTRA chaired by Adriaan Rijnsdorp (the Netherlands) and Maarten Soetaert (Belgium) met from 17-19 April 2018 at Wageningen Marine Research, Haringkade 1, IJmuiden, the Netherlands. The working group was attended by 17 participants from five countries to address the request for advice from the Netherlands to compare the ecological and environme...
Preprint
Full-text available
In the eastern Bay of Seine, which is a representative area of coastal zones exposed to numerous anthropogenic disturbances, data from a long-term monitoring program of the benthic macrofauna based on a framework of 60 stations sampled during 7 cruises from 1988 to 2016 were used to investigate the link between species and functional diversity at d...
Preprint
Full-text available
In the eastern Bay of Seine, which is a representative area of coastal zones exposed to numerous anthropogenic disturbances, data from a long-term monitoring program of the benthic macrofauna based on a framework of 60 stations sampled during 7 cruises from 1988 to 2016 were used to investigate the link between species and functional diversity at d...
Preprint
Full-text available
While coastal ecosystems experience increasing pressures due to human activities and climate change, measurement of functional diversity based on the biological traits analysis (BTA) is increasingly used as a tool to assess ecosystem functioning and its responses to disturbance. A review of more than 80 papers published since 2003 highlights large...
Preprint
Full-text available
While coastal ecosystems experience increasing pressures due to human activities and climate change, measurement of functional diversity based on the biological traits analysis (BTA) is increasingly used as a tool to assess ecosystem functioning and its responses to disturbance. A review of more than 80 papers published since 2003 highlights large...
Article
Full-text available
Seagrass meadows form highly productive and valuable ecosystems in the marine environment. Throughout the year, seagrass meadows are exposed to abiotic and biotic variations linked to (i) seasonal fluctuations, (ii) short-term stress events such as, e.g., local nutrient enrichment, and (iii) small-scale disturbances such as, e.g., biomass removal b...
Poster
Full-text available
The complexity and scales of the processes that shape communities of marine benthic macroinvertebrates has limited our understanding of their assembly mechanisms and the potential to make reliable predictions about their spatial and temporal dynamics. Individual-based models can shed light on community assembly mechanisms, by allowing observed spat...
Article
Full-text available
Les hermelles sont des vers marins qui vivent dans des tubes extrêmement caractéristiques, à l'aspect de cellules d'abeilles, qu’ils édifient autour d’eux à partir de sable et de leurs sécrétions. La famille à laquelle elles appartiennent, les sabellaridés, comporte actuellement 12 genres, parmi lesquels on compte plus de 115 espèces, dont seulemen...
Article
The effect of an invasive infaunal suspension-feeding bivalve, the Manila clam Ruditapes philippinarum, on benthic inorganic carbon and nutrient fluxes was examined through in situ incubations. Measurements were performed in spring and summer on a tidal sandflat of the Rance estuary (south part of the Western English Channel) colonized by the Manil...
Article
Full-text available
The increase of anthropogenic pressures on the marine environment together with the necessity of a sustainable management of marine living resources have underlined the need to map and model coastal environments, particularly for the purposes of spatial planning and for the implementation of integrated ecosystem-based management approach. The prese...
Data
GLM results for TDI* ~ Risk + Abrasion, *log-transformed values. (XLSX)
Data
Taxon grouping and associated functional traits scoring: The maximum value of the regrouped species functional traits scoring was retained for each group, when taxonomic groupings were considered, the group indicator homogeneity was checked using standard deviation. If the SD of any given indicator for a group was above 1.5 and if the SD of the sum...
Data
Spearman correlation matrix between the functional biological traits. (XLSX)
Data
10 best results of the Bio-Env analysis. (XLSX)
Data
Calculations steps for estimating the friction velocity. (DOCX)
Article
Sabellaria alveolata is a gregarious polychaete that uses sand particles to build three-dimensional structures known as reefs, fixed atop rocks or built on soft sediments. These structures are known to modify the local grain-size distribution and to host a highly diversified macrofauna, altered when the reef undergoes disturbances. The goal of this...
Article
In order to better understand and predict the dynamics of benthic macroinvertebrate communities, we need to first define the functional components of benthic biodiversity and then provide a mechanistic description of how they interact with their abiotic environment, their basic resources and each other. These interactions should be largely controll...
Article
Full-text available
Seagrasses are marine flowering plants distributed worldwide. They are however threatened, mostly due to the increase of human activities. Seagrasses have the capacity to adapt their morphological, physiological, and mechanical traits to their local conditions. Mechanical traits have been identified as a good tool to investigate a plant-species cap...
Article
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...