Thibaut de Bettignies

Thibaut de Bettignies
Muséum National d'Histoire Naturelle · PatriNat (OFB - CNRS - MNHN)

PhD Edith Cowan University, MSc Université Paris VI
Scientific project manager 'Ecology and ecological state of marine habitat/species'

About

47
Publications
22,082
Reads
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2,569
Citations
Introduction
RESEARCH & EXPERTISE : Temperate reef conservation / Kelp biomechanics & phenology / Temperate reef & tropicalisation / Evaluation of marine habitat-species / Ecological coherence of MPA network / Bioindicators for reef conservation
Additional affiliations
May 2013 - January 2016
University of Western Australia
Position
  • Research Associate
January 2011 - April 2013
University of Western Australia
Position
  • Research Officer - Continental-scale patterns of ecological processes in kelp beds
December 2008 - January 2013
Edith Cowan University
Position
  • PhD Student
Education
January 2009 - January 2013
Edith Cowan University
Field of study
  • Marine Biology
September 2006 - July 2007
Sorbonne Université
Field of study
  • Oceanography and Marine Environment
September 2005 - July 2006
Université de Bretagne Occidentale
Field of study
  • Marine Biology

Publications

Publications (47)
Technical Report
Full-text available
Drastic losses of kelp forest habitat have already occurred in the southern part of the OSPAR area with significant declines at several locations elsewhere. Considering the sensitivity of this complex and highly productive habitat to cumulative effects of multiple pressures, and the increasing threat posed by climate change, the nominated kelp fore...
Article
Full-text available
The UN Decade of Ecosystem Restoration is a response to the urgent need to substantially accelerate and upscale ecological restoration to secure Earth’s sustainable future. Globally, restoration commitments have focused overwhelmingly on terrestrial forests. In contrast, despite a strong value proposition, efforts to restore seaweed forests lag far...
Book
Full-text available
La Directive Habitats-Faune-Flore (dite « DHFF », 92/43/CEE) a listé des grands types d’habitats naturels qui nécessitent des mesures de conservation, les Habitats naturels d’Intérêt Communautaire (HIC). Ces HIC sont définis au niveau européen dans le manuel d’interprétation des habitats de l’Union européenne (dit « EUR 28 »). Pour le domaine mari...
Technical Report
Full-text available
L'établissement d'un réseau cohérent de sites Natura 2000, composé de sites d'importance communautaire (SIC) désignés en zones spéciales de conservation (ZSC) et de zones de protection spéciale (ZPS), constitue un objectif majeur au regard de la mise en œuvre des Directives « Habitats-Faune-Flore » (DHFF, 92/43/CEE) et « Oiseaux » (DO, 2009/147/CE)...
Technical Report
Full-text available
La Liste Rouge des Ecosystèmes (LRE) de l’Union International pour la Conservation de la Nature (UICN) a été développée afin de pouvoir évaluer le risque d’effondrement des écosystèmes. Avant de pouvoir initier un nouveau chapitre national marin de LRE portant sur les herbiers de phanérogames marines de France métropolitaine, un travail préliminair...
Technical Report
Full-text available
This Background Document on Kelp Forest habitat has been developed by OSPAR following the inclusion of this habitat on the OSPAR List of threatened and/or declining species and habitats (OSPAR Agreement 2008-6). The inclusion of the feature on the list was supported by an analysis against the Texel-Faial criteria (OSPAR Agreement 2019-03), as prese...
Technical Report
Full-text available
Les réseaux marins de BirdLife International avec les “marine Important Bird Areas” (mIBAs) et celui des Zones de Protection Spéciales (ZPS) Natura 2000 mis en place par les États membres en application de la directive “Oiseaux” partagent un but commun: la conservation des oiseaux marins à long terme par la protection des zones les plus importantes...
Article
Full-text available
As the environment is getting warmer and species are redistributed, consumers can be forced to adjust their interactions with available prey, and this could have cascading effects within food webs. To better understand the capacity for foraging flexibility, our study aimed to determine the diet variability of an ectotherm omnivore inhabiting kelp f...
Technical Report
Full-text available
A l’occasion d’un audit de la Commission européenne sur l’évaluation coordonnée des espèces et habitats marins dans le cadre des Directives Oiseaux (DO), Habitats-Faune-Flore (DHFF) et de la Directive-Cadre Stratégie pour le Milieu Marin (DCSMM), une étude approfondie a été réalisée sur le niveau d’intégration de la surveillance et de l’évaluation...
Article
Full-text available
Seaweed growth is often limited by light. Artificial light supply has been well studied in terrestrial agriculture, however, much less is known about its effect in seaweed aquaculture. In this study, the effects of four artificial light sources (white, red, green, and blue LEDs light) on a brown alga Sargassum fusiforme and a green alga Ulva pertus...
Technical Report
Full-text available
La ZPF (Zone de Protection Forte) est une mesure (M003-NAT1B) de la Directive Cadre Stratégie pour le Milieu Marin (DCSMM), qui permet de diminuer très significativement voire de supprimer les principales pressions sur les enjeux écologiques (habitats et espèces marines) justifiant la protection forte, en réglementant fortement les activités humain...
Technical Report
Full-text available
Les missions d’inventaire de biodiversité comme les Grandes Expéditions du MNHN permettent de prospecter un grand nombre de stations en plongée, pouvant ainsi servir de stations de référence pour la gestion locale (notamment des aires marines protégées), à condition de proposer une approche adaptée aux problématiques de gestion et conservation. Da...
Technical Report
Full-text available
Ce rapport présente la version actualisée de la partie « Atlantique » du référentiel national des habitats marins benthiques en expliquant les modifications opérées. La mise à jour de la partie marine du référentiel européen EUNIS ainsi que les échanges avec les benthologues ont conduit à revoir les principes généraux de la typologie. La structure...
Article
Full-text available
As plants on land, seaweeds are likely to be susceptible to temperature-mediated changes in phenology such as shifts in their reproductive timing. With this review, we aimed to investigate the importance of temperature on reproductive phenophase transitions (i.e., maturation and release of propagules) of temperate seaweeds while discussing how glob...
Article
Full-text available
Seaweeds are good bio-monitors of heavy metal pollution and have been included in European coastal monitoring programs. However, data for seaweed species in China are scarce or missing. In this study, we explored the potential of seaweeds as bio-monitor by screening the natural occurring seaweeds in the “Kingdom of seaweed and shellfish” at Dongtou...
Article
Full-text available
Herbivorous fishes play a critical role in maintaining or disrupting the ecological resilience of many kelp forests, coral reefs and seagrass ecosystems, worldwide. The increasing rate and scale of benthic habitat loss under global change has magnified the importance of herbivores and highlights the need to study marine herbivory at ecologically re...
Article
Full-text available
Globally, many temperate marine communities have experienced significant temperature increases over recent decades in the form of gradual warming and heatwaves. As a result, these communities are shifting towards increasingly subtropical and tropical species compositions. Expanding coral populations have been reported from several temperate reef ec...
Technical Report
Full-text available
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...
Article
Full-text available
Kelps and fucoids are dominant habitat-forming seaweeds along temperate rocky coastlines. Here, we tested the physiological performance of a dominant kelp (Ecklonia radiata) and two fucoids (Scytothalia dorycarpa and Sargassum fallax), distributed along the southwest coast of Australia. Photosynthesis and respiration were measured against increment...
Article
Full-text available
Ecosystem reconfigurations arising from climate-driven changes in species distributions are expected to have profound ecological, social, and economic implications. Here we reveal a rapid climate-driven regime shift of Australian temperate reef communities, which lost their defining kelp forests and became dominated by persistent seaweed turfs. Aft...
Conference Paper
Full-text available
Temperate seaweeds have undergone local extinction and shifts in distribution in response to recent warming. Seaweeds generally show a narrowing of temperature tolerance from survival to reproduction, indicating high temperature sensitivity of reproduction. However detecting impacts of warming on seaweed reproduction has been impeded by a lack of s...
Poster
Full-text available
Productive and diverse seaweed forests flourish on healthy temperate reefs given sufficient light, water motion & nutrients. However, anthropogenic pressures such as eutrophication threaten the extent and condition of canopy-forming seaweed. We ran a meta-analysis of eutrophication impacts on temperate reefs from a range of studies. Our objectives...
Article
Ecosystem reconfigurations arising from climate-driven changes in species distributions are expected to have profound ecological, social, and economic implications. Here we reveal a rapid climate-driven regime shift of Australian temperate reef communities, which lost their defining kelp forests and became dominated by persistent seaweed turfs. Aft...
Article
Full-text available
Rear (warm) edge populations are often considered more susceptible to warming than central (cool) populations because of the warmer ambient temperatures they experience, but this overlooks the potential for local variation in thermal tolerances. Here we provide conceptual models illustrating how sensitivity to warming is affected throughout a speci...
Data
Supplementary Figures 1-3 and Supplementary References.
Article
Full-text available
Canopy-forming seaweeds, as primary producers and foundation species, provide key ecological services. Their responses to multiple stressors associated with climate change could therefore have important knock-on effects on the functioning of coastal ecosystems. We examined interactive effects of UVB radiation and warming on juveniles of three habit...
Data
Health status of Ecklonia, Scytothalia and Sargassum incubated at temperatures from 16 to 30°C, with (black) or without (white) UVB radiation (triangles: after 1 week; circles: after 2 weeks). (DOCX)
Article
Interactions between hosts and associated microbial communities can fundamentally shape the development and ecology of 'holobionts', from humans to marine habitat-forming organisms such as seaweeds. In marine systems, planktonic microbial community structure is mainly driven by geography and related environmental factors, but the large-scale driver...
Article
Full-text available
Species interactions are integral drivers of community structure and can change from competitive to facilitative with increasing environmental stress. In subtidal marine ecosystems, however, interactions along physical stress gradients have seldom been tested. We observed seaweed canopy interactions across depth and latitudinal gradients to test wh...
Article
Full-text available
Kelps often live in a harsh hydrodynamic environment where wave-driven dislodgement of individuals can alter the biodiversity and functioning of reef systems, and increase production in coastal ecosystems adjacent to reefs. The current paradigm is that winter storms tear kelps from reefs once hydrodynamic forces exceed attachment or tissue strength...
Poster
Kelps live in a harsh hydrodynamic environment where wave-driven dislodgement of individuals is an important ecological process which can alter the biodiversity and functioning of reef systems, and increase production in coastal ecosystems adjacent to reefs. The current paradigm is that winter storms tear kelps from reefs once hydrodynamic forces e...
Conference Paper
Full-text available
The kelp Eckonia radiata is a prominent habitat-forming species on coastal reefs throughout the three temperate biogeographical provinces of southern Australia, where it has been dubbed the ecologically most important species. In order to better understand what drives the ecological functions associated with this ubiquitous species, we assessed the...
Article
Full-text available
We quantified simultaneously dislodgement and erosion for a dominant kelp species (Ecklonia radiata) over 1 yr, and related both to potential explanatory factors (wave exposure, temperature, and kelp fecundity). Erosion was the largest contributor of detritus, accounting for 80% of annual production. Most erosion occurred as a major pulse in autumn...
Thesis
Full-text available
Thesis Topic: Relative losses of kelp tissue by complete dislodgement during storms or partial fragmentation of their structure, and the implications for kelp survival. Thibaut’s thesis explored the production of kelp debris from rocky reefs. These are large attached seaweeds and this process provides food for various organisms. It was thought tha...
Article
Full-text available
The morphology and shape of algae can affect their survival in wave-swept environments because of the hydrodynamic drag created by water flow. Studies of morphology and drag are typically conducted at relatively low water velocities, and the influence of algal morphology on drag, over the range of water velocities algae must cope with in their natu...
Article
Full-text available
Extreme climatic events, such as heat waves, are predicted to increase in frequency and magnitude as a consequence of global warming but their ecological effects are poorly understood, particularly in marine ecosystems1, 2, 3. In early 2011, the marine ecosystems along the west coast of Australia—a global hotspot of biodiversity and endemism4, 5—ex...
Article
Full-text available
Kelps are highly productive seaweeds predominantly found in wave-exposed environments. Physical and biological processes such as sand abrasion, whiplash and grazing can wound kelp tissue, potentially weakening its ability to withstand wave forces. Despite the ecological importance of kelp tissue loss, few studies have quantified wounding patterns i...
Article
Full-text available
Seagrasses reduce sediment erosion, filter land-derived pollutants, and provide living space for numerous invertebrates, but seagrasses are increasingly threatened by bloom-forming macroalgae. We tested for density-dependent effects of the macroalga Gracilaria comosa on the seagrass Halophila ovalis and its associated invertebrates in a subtidal fi...
Article
Extreme climatic events, such as heat waves, are predicted to increase in frequency and magnitude as a consequence of global warming but their ecological effects are poorly understood , particularly in marine ecosystems 1-3. In early 2011, the marine ecosystems along the west coast of Australia-a global hotspot of biodiversity and endemism 4,5-expe...
Conference Paper
Full-text available
The small kelp Eckonia radiata is a prominent habitat-forming species on coastal reefs throughout the three temperate biogeographical provinces of southern Australia, where it has been dubbed the ecologically most important species. In order to better understand what drives the ecological functions associated with this ubiquitous species, we assess...
Conference Paper
Full-text available
Kelps (brown algae of the order Laminariales) are highly productive in temperate zones where they produce one of the largest biogenic structures found in benthic marine ecosystem. They play a key ecological role locally but are also important outside their own habitat, when part of their biomass is exported. The high productivity of kelps and their...
Conference Paper
Full-text available
Kelps are dominant primary producers in temperate marine ecosystem. Their high productivity and susceptibility to dislodgment by waves and currents provides a strong opportunity for subsidy of biomass to adjacent low-productivity habitats (e.g. beaches, surf zone). I will present data to highlight the importance of individual storms in driving this...
Conference Paper
Full-text available
The kelp Ecklonia radiata is a dominant component of rocky surfaces in shallow marine habitats around southern Australia. It has been the focus of much research in south-western Australia in particular in the last 30 or so years. I will present data drawing on results of several large and small studies spanning more than a decade, and will examine...
Poster
Full-text available
The coastal zone has several discrete habitats such as reefs, seagrass meadows, unvegetated areas, and beaches. Cross-habitat flows of resources or consumers are an important feature of near-shore food webs, and these spatial flows imply a high connectivity between habitats. Specifically, macroalgae are frequently dislodged from reefs and exported...
Conference Paper
Full-text available
The coastal zone has several discrete habitats such as reefs, seagrass meadows, unvegetated areas, and beaches. Cross-habitat flows of resources or consumers are an important feature of near-shore food webs, and these spatial flows imply a high connectivity between habitats. Specifically, macroalgae are frequently dislodged from reefs and exported...
Article
Full-text available
This study assessed the possible combined effects of harmful algae and parasite infection on hemocyte and hemolymph parameters of a bivalve mollusc. Manila clams Ruditapes philippinarum, were exposed for 1 week, under controlled laboratory conditions, to bloom concentrations of two cultured dinoflagellates: Karenia selliformis, and Karenia mikimoto...

Questions

Question (1)
Question
Hello,
I have a dataset based on transect data (150m2, limited time : 30', 1 transect/station, 50 stations along Corsica) with a closed list of indicative reef species (75 sp.) that I scored (0 to 4) according to 2 different semi-quantitative scales (space occupier sp. : percent cover and individual/colonie : abundance - following different log scales). I would like to run multivariate analysis combining both types of variables to identify clusters and look at species driving such grouping and further relate to environment variables. I am a bit stuck right now, how could I analyse such dataset ?
Thank you for your help.

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Projects

Projects (6)
Project
Kelp forests are an important habitat for a range of marine species and they play an important role in the sequestration of atmospheric carbon. Drastic losses of kelp forest habitat have already occurred in the southern part of the OSPAR Maritime Area with significant declines at several locations elsewhere. Kelp forests grow in coastal waters and are made up of several different species of kelp, some of which have shown a drastic decline and are known to be affected by destructive fishing practices and coastal pollution. Climate change is foreseen to add to the multiple pressures already impacting kelp forests. The Kelp Forest habitat has been agreed in 2021 to be listed on the OSPAR list of threatened and/or declining habitat. The documents published here for this project comply with the OSPAR Listing requirements.
Project
As part of the MNHN exploration program "La Planète Revisitée" in Corsica (http://laplaneterevisitee-corse.mnhn.fr/), we are investigating new method for fast habitat survey for better management solutions.