WorldCat Identities

Chauvaud, Laurent

Overview
Works: 29 works in 39 publications in 2 languages and 700 library holdings
Roles: Editor, Opponent, Other, Thesis advisor, Author, Publishing director, Contributor
Classifications: QC869, 551.6
Publication Timeline
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Most widely held works by Laurent Chauvaud
Impacts des sons anthropiques sur la faune marine by Sylvain Chauvaud( )

3 editions published in 2018 in French and held by 563 WorldCat member libraries worldwide

La question de l'impact des sons anthropiques sur la faune marine se révèle un enjeu écologique et économique majeur pour les années à venir. Cet ouvrage présente les fondamentaux de l'acoustique sous-marine ainsi que les effets des sons sur la faune marine. Une place particulière est donnée aux premiers retours d'expérience de production d'énergies marines renouvelables en Europe
La vie sous la glace une oasis au pôle Sud by Paul Tréguer( )

6 editions published in 2013 in French and held by 84 WorldCat member libraries worldwide

La coquille Saint-Jacques : sentinelle de l'Océan by Laurent Chauvaud( Book )

1 edition published in 2019 in French and held by 16 WorldCat member libraries worldwide

Patrimoine naturel des fonds marins de Saint-Pierre-et-Miquelon by Emmanuelle Hascoët( Book )

1 edition published in 2019 in French and held by 3 WorldCat member libraries worldwide

La coquille Saint-Jacques en rade de Brest : un modèle biologique d'étude des réponses de la faune benthique aux fluctuations de l'environnement by Laurent Chauvaud( Book )

2 editions published in 1998 in French and held by 3 WorldCat member libraries worldwide

Analyse de la composition élémentaire de Pecten maximus par HR-ICP-MD Element 2 : développements méthodologiques et interprétations écologiques by Manuel Richard( Book )

3 editions published in 2009 in French and held by 2 WorldCat member libraries worldwide

The elemental composition of bivalve shells is already considered, by international scientific community, as a promising tool to record environmental parameters like sea surface temperature, salinity and primary productivity. The aim of this work was to develop an analytical method on the high-resolution inductively coupled plasma-mass spectrometry (HR-ICP.MS, Finnigan Element 2) to demonstrate a quantitative detection of trace element in biocarbonates matrices (CaCO3). Two methods (LA-ICP-MS, Solution Based ICP-MS) has been developed to drawn ontogenetic profiles of elemental ratios with a 3-day temporal resolution. Element profiles obtained on the same left valve of P. maximus by the two methods were reproducible whatever the concentrations and whatever the ribs selected on the valve. The variations of two specific element traces (Mo, Li) in P. maximus shells were discussed. Mo concentration is characterised by a background level within sharp episodic peaks occurring in spring (may). Explanation hypothesis are discussed but the most probable is the ingestion of phytoplankton cells grown upon N03- (which have a large Mo concentration associated to the activity of nitrate reductase). Some populations of P. maximus present sharp episodic Li peaks in the growth period. This study illustrate that there is no direct relationship between environmental parameters (salinity, temperature, water composition of Li, nitrates...) and Li peaks, but Li enrichment still may be related to blooms of specific species of phytoplancton. In addition, we found that the background profile of Li seems to be mainly controlled by the growth rate
Sound production and associated behaviours of benthic invertebrates from a coastal habitat in the north-east Atlantic by Laura Coquereau( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Sperm motility in turbot, Scophthalmus marimus: initiation of movement and changes with time of swimming characteristics by Laurent Chauvaud( )

1 edition published in 1995 in English and held by 2 WorldCat member libraries worldwide

Evidence of a 2-day periodicity of striae formation in the tropical scallop Comptopallium radula using calcein marking by Julien Thébault( )

1 edition published in 2005 in English and held by 2 WorldCat member libraries worldwide

Compound-specific recording of gadolinium pollution in coastal waters by great scallops by Samuel Le Goff( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Green Edge ice camp campaigns: understanding the processes controlling the under-ice Arctic phytoplankton spring bloom by Philippe Massicotte( )

1 edition published in 2020 in English and held by 2 WorldCat member libraries worldwide

Spatial Variability of Stable Isotope Ratios in Oysters (Crassostrea gigas) and Primary Producers Along an Estuarine Gradient (Bay of Brest, France) by Violette Marchais( )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

Growth and longevity of Lithophaga lithophaga: what can we learn from shell structure and stable isotope composition? by Melita Peharda( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

Variation in size and growth of the great scallop pecten maximus along a latitudinal gradient by Laurent Chauvaud( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

Understanding the relationship between growth and temperature will aid in the evaluation of thermal stress and threats to ectotherms in the context of anticipated climate changes. Most Pecten maximus scallops living at high latitudes in the northern hemisphere have a larger maximum body size than individuals further south, a common pattern among many ectotherms. We investigated differences in daily shell growth among scallop populations along the Northeast Atlantic coast from Spain to Norway. This study design allowed us to address precisely whether the asymptotic size observed along a latitudinal gradient, mainly defined by a temperature gradient, results from differences in annual or daily growth rates, or a difference in the length of the growing season. We found that low annual growth rates in northern populations are not due to low daily growth values, but to the smaller number of days available each year to achieve growth compared to the south. We documented a decrease in the annual number of growth days with age regardless of latitude. However, despite initially lower annual growth performances in terms of growing season length and growth rate, differences in asymptotic size as a function of latitude resulted from persistent annual growth performances in the north and sharp declines in the south. Our measurements of daily growth rates throughout life in a long-lived ectothermic species provide new insight into spatio-temporal variations in growth dynamics and growing season length that cannot be accounted for by classical growth models that only address asymptotic size and annual growth rate
Effets du changement climatique sur la distribution de la macrofaune benthique en Manche by François Gaudin( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

In the North-East Atlantic, the English Channel constitutes a biogeographical transition zone between the Boreal and Lusitanian provinces. Thus, many species reach there their distribution range limits. The aim of this thesis is to assess the effects of recent climate change on the distribution of the subtidal benthic macrofauna, poorly studied to date, basing on the comparison of data collected during a cool period (i.e. 1960s-70s) and during a warm period (i.e. 2012 and 2014) in the circalittoral coarse sediments. Two large communities were highlighted in the study of the structure of the assemblages found in this habitat: the gravelly coarse sand community and the pebbles and gravels community. The analysis of the evolution of seabed temperature for the last 30 years showed the spatial heterogeneity of the warming, varying from 0.1 to 0.5°C per decade from West to East. This warming did not translate into large species distribution shifts but into a sharp decrease in the number of occurrences of cold-water species and a sharp increase in the number of occurrences of warm-water species. Development of species distribution models allowed to identify the relative importance of climatic and edaphic factors in the distribution of benthic invertebrates in the Channel and to assess the species' ability to adjust their distribution to the rise in temperature. The whole results suggest that ongoing climate change could lead to a decrease in benthic biodiversity at range limits, especially where connection routes are lacking for new migrants
La matière organique particulaire dans les systèmes côtiers : composition, dynamique et forçages à l'échelle multi-systémique by Camilla Liénart( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

Pelagic coastal systems are characterized by multiple inputs of particulate organic matter (POM) from autochthonous (phytoplankton) and allochthonous (continental, benthic) origin whose spatial and temporal variability can be high. The aims of my PhD were to 1) quantify POM composition in pelagic coastal systems, 2) determine the forcings to its spatio-temporal dynamics and 3) investigate the link between bacteria and POM composition. This study was conducted on twelve systems (estuary, lagoon, bays, rias, littoral) distributed over the three maritime facades of France by combining the use of elemental and isotopic ratios (composition), fatty acids (POM-bacteria link) and multivariate analysis (forcings).At multi-systems and/or intra-system scale, two main gradients are observed:- an inshore (higher continental and benthic contribution) - offshore gradient (phytoplanktonic POM) mainly related to hydrodynamics and sedimentary hydrodynamics (river flow, resuspension of benthic material) and to the proximity to allochthonous sources- a South (POM related to diazotrophy) - North (absence of this POM) gradient, associated to the trophic status (oligo vs meso/eutrophy) of the studied systems.The seasonality of spatio-temporal dynamics of POM composition is highly variable depending on the station. It is in general higher near the coast and lower offshore and upstream in the studied estuary. This dynamic is also strongly associated to sedimentary hydrodynamics.Finally, this study highlight that bacterial biomass is mainly associated to continental and benthic POM
Adaptations métaboliques des organismes dans la zone de balancement des marées : implications sur la biodiversité locale dans un contexte de changement climatique by Morgana Tagliarolo( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

La zone côtière représente seulement une petite partie de la surface océanique, mais elle joue un rôle important dans le cycle du carbone. Pour contribuer à préciser ce rôle, l'objectif de cette thèse était d'étudier les flux de carbone, en immersion et en émersion, des communautés benthiques intertidales vivant sur les estrans rocheux. La respiration et la calcification des principales espèces macrozoobenthiques ont été mesurées en laboratoire pour d'estimer les différentes adaptations métaboliques liées à une vie en milieu intertidal. En complément, les flux globaux de carbone des communautés ont été quantifiés aux interfaces air-sédiment et eau-sédiment grâce à des mesures in situ. D'une manière générale, la respiration de la communauté prévaut sur la production primaire, en conséquence les estrans rocheux semi-battus peuvent être considérés comme hétérotrophes. Grâce aux mesures de respiration en laboratoire et aux comptages d'espèces effectués sur les côtes rocheuses bretonnes, nous avons pu estimer la contribution du macrozoobenthos aux flux de carbone à une échelle régionale. La comparaison entre les résultats in situ et les études en laboratoire à permis de valider nos méthodes
Le climat à découvert by Comité national de la recherche scientifique (France)( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

Qu'est ce que l'effet de serre? Le rôle de l'homme sur le climat est-il détectable et comment? Comment mesure-t-on la fonte de la banquise, le recul des glaciers de montagne ou bien encore l'élévation du niveau de la mer? Comment les chercheurs font-ils pour modéliser un système aussi complexe que la planète terre? Quelles données permettent de décrire et modéliser les climats passés? Comment s'y prend-on pour prévoir l'évolution à venir du climat? À l'écart de la polémique médiatique, Catherine Jeandel et Rémy Mosseri ont mobilisé plus d'une centaine de contributeurs qui livrent ici un panorama large des méthodes et outils mis en œuvre pour étudier notre climat et son avenir. Ils montrent que, pour résoudre cette question extraordinairement complexe, une approche pluridisciplinaire est plus que jamais nécessaire, a la croisée de l'expérimentation, de l'observation, de la simulation et de la théorie. Un livre majeur
Sources de variation de la forme des otolithes : Implications pour la discrimination des stocks de poissons by Kélig Mahé( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

The assessment and management of fish populations is based on the use of management units called fish stocks. The shape of otoliths, calcified structures of the fish's inner ear, can be used to discriminate these stocks. First, this thesis focuses on the study of the spatio-temporal variability of the otolith's shape for three fish species with different ecological characteristics (size, swimming speed, behaviour in the water column, etc.) and biogeographical environments. The results showed that there is a decreasing structural gradient across stock sizes from large pelagic species to more localised demersal species. This is linked to the fact that some demersal species such as the bogue (Boops boops) are constrained by the presence of geographical barriers and hydrological fronts, which is not the case for the analysed pelagic species (blue whiting, Micromesistius poutassou; swordfish, Xiphias gladius). Secondly, we tested the effects of potential confounding factors (e. g. bilateral directional asymmetry, DA) on the discriminating power of an otolith's shape. We have shown that there is a DA for bogue, induced by the lateralisation process, which varies in amplitude and direction according to the geographical area. In the bogue, this DA impacts stock identification by otolith shape, which changes according to which otolith is used (i.e. right or left). Otolith shape is useful to discriminate among fish stocks because it reflects the specific environmental conditions that fish have experienced during their lifetime. Finally, in the third part of the thesis, we analyzed, under controlled conditions, the effects of temperature and the diet content of omega-3 polyunsaturated fatty acids (n-3 PUFAs) on otolith morphogenesis for seabass (Dicentrachus labrax). After emergence, two phases can be distinguished in the ontogenesis of otolith shape with an initial elongation that reflects slower growth of the dorso-ventral axis compared to the antero-posterior axis. This leads to more localized modifications, in particular, in a more complex area between the rostrum and the anti-rostrum, which is clearly linked to the thermal regime. Conversely, the percentage of n-3 PUFAs does not appear to influence otolith morphogenesis. The use of growing degree days (GDD) has shown that the effect of temperature is to accelerate morphogenesis, but also to change its trajectory: at a fixed GDD value, for two given temperatures, the shapes differ. All the results obtained in this thesis validate the use of the otolith shape to discriminate fish stocks, but also emphasize the need to know the precise sources of morphological variability of intra-stock otoliths in order to determine more precisely the limits of fish stocks
 
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Alternative Names
Laurent Chauvaud onderzoeker

Languages
French (21)

English (9)