Consulta: creatorFacets:"Lavaud, Romain"
Registros recuperados: 10
Data/hora: 07/06/2024 08:30:06

Growth and distribution of the great scallop (Pecten maximus) in the English Channel: a modelling approach.
Provedor de dados: 5
Autores: Le Goff, Clement; Lavaud, Romain; Cugier, Philippe; Jean, Frédéric; Flye Sainte Marie, Jonathan.
The great scallop Pecten maximus is currently the most important species in landings (as well in tons as in value) for the French inshore fleet of the English Channel. A French scientific program “COMANCHE” funded by the French National Research Agency (ANR) was conducted to improve our knowledge on the great scallop within its ecosystem, in an integrated way and over the whole area of the English Channel. In that context, the aim of this study is to better understand the determinism of the growth and distribution of the great scallop in the English Channel, integrating both physical and trophic constraints through a modelling approach. The used method is based on the coupling of a 3D hydrodynamical model (MARS3D developed at Ifremer) providing...
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00139/24987/23087.pdf

Deep sequencing of the mantle transcriptome of the great scallop Pecten maximus
Provedor de dados: 5
Autores: Artigaud, Sebastien; Thorne, Michael A. S.; Richard, Joelle; Lavaud, Romain; Jean, Fred; Flye-sainte-marie, Jonathan; Peck, Lloyd S.; Pichereau, Vianney; Clark, Melody S.
RNA-Seq transcriptome data were generated from mantle tissue of the great scallop, Pecten maximus. The consensus data were produced from a time course series of animals subjected to a 56-day thermal challenge at 3 different temperatures. A total of 26,064 contigs were assembled de novo, providing a useful resource for both the aquaculture community and researchers with an interest in mollusc shell production.
Tipo: Text
Palavras-chave: Pecten maximus; RNAseq; Temperature.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00202/31362/82662.pdf

New insights into the seasonal feeding ecology of Pecten maximus using pigments, fatty acids and sterols analyses
Provedor de dados: 5
Autores: Lavaud, Romain; Artigaud, Sebastien; Le Grand, Fabienne; Donval, Anne; Soudant, Philippe; Flye-sainte-marie, Jonathan; Strohmeier, Tore; Strand, Oivind; Leynaert, Aude; Beker, Beatriz; Chatterjee, Arnab; Jean, Fred.
We combined the use of pigments, fatty acids and sterols as biomarkers of the seasonal variation in food sources of the great scallop Pecten maximus. From March to October 2011, on a biweekly to twice-weekly basis, scallops and seawater from the water column and the water-sediment interface were collected in the Bay of Brest (Brittany, France). Pigment compositions in the seawater and in the stomach and rectum content of the scallops were analyzed by HPLC. Fatty acids and sterols from digestive gland (DG) tissue were analyzed by gas chromatography. Potential relationships between the temporal proportion of each marker in the environment and in the digestive tract were tested using multivariate analysis. Proportions of diatoms and Dinophyceae biomarkers...
Tipo: Text
Palavras-chave: Trophic ecology; Food sources; Pigments; Fatty acids; Trophic marker; Phytoplankton; Pecten maximus.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00431/54244/55772.pdf

Integrating the effects of salinity on the physiology of the eastern oyster, Crassostrea virginica, in the northern Gulf of Mexico through a Dynamic Energy Budget model
Provedor de dados: 5
Autores: Lavaud, Romain; La Peyre, Megan K.; Casas, Sandra M.; Bacher, Cedric; La Peyre, Jerome F.
We present a Dynamic Energy Budget (DEB) model for the eastern oyster, Crassostrea virginica, which enables the inclusion of salinity as a third environmental variable, on top of the standard foodr and temperature variables. Salinity changes have various effects on the physiology of oysters, potentially altering filtration and respiration rates, and ultimately impacting growth, reproduction and mortality. We tested different hypotheses as to how to include these effects in a DEB model for C. virginica. Specifically, we tested two potential mechanisms to explain changes in oyster shell growth (cm), tissue dry weight (g) and gonad dry weight (g) when salinity moves away from the ideal range: 1) a negative effect on filtration rate and 2) an additional...
Tipo: Text
Palavras-chave: DEB theory; Bioenergetics; Filtration; Maintenance; Growth; Estuary; Louisiana.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00400/51137/53773.pdf

New insights into the reproductive cycle of two Great Scallop populations in Brittany (France) using a DEB modelling approach
Provedor de dados: 5
Autores: Gourault, Melaine; Lavaud, Romain; Leynaert, Aude; Pecquerie, Laure; Paulet, Yves-marie; Pouvreau, Stephane.
The present study aimed to improve understanding of the environmental conditions influencing the reproductive cycle of the great scallop Pecten maximus in two locations in Brittany (France). We also evaluated potential consequences of future climate change for reproductive success in each site. We simulated reproductive traits (spawning occurrences and synchronicity among individuals) of P. maximus, using an existing Dynamic Energy Budget (DEB) model. To validate and test the model, we used biological and environmental datasets available for the Bay of Brest (West Brittany, France) between 1998 and 2003. We also applied the scallop DEB model in the Bay of Saint-Brieuc (North Brittany, France) for the same period (1998–2003) to compare the reproductive...
Tipo: Text
Palavras-chave: Pecten maximus; DEB theory; Reproduction cycle; IPCC scenarios; Bay of Brest; Bay of Saint-Brieuc.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00458/57012/58910.pdf

Modeling the impact of hypoxia on the energy budget of Atlantic cod in two populations of the Gulf of Saint-Lawrence, Canada
Provedor de dados: 5
Autores: Lavaud, Romain; Thomas, Yoann; Pecquerie, Laure; Benoit, Hugues P.; Guyondet, Thomas; Flye-sainte-marie, Jonathan; Chabot, Denis.
Like many marine species around the globe, several stocks of Atlantic cod (Gadus morhua) live in increasingly hypoxic waters. In the Gulf of Saint Lawrence (GSL) in Canada, the deep channels traversing the semi-enclosed sea exhibit year-round hypoxia, identified as one of the limiting factor for the recovery of GSL cod in its northern part. While many individuals in the northern GSL are known to venture in deeper, warmer, and more hypoxic waters of the Gulf channels, those in the southern GSL live in a shallower, colder, and more oxygenated environment. In this study, we use the modeling framework of the Dynamic Energy Budget (DEB) theory to disentangle the effects of hypoxia, temperature and food on the life-history traits of these two populations of cod...
Tipo: Text
Palavras-chave: Hypoxia; Dynamic energy budget; Atlantic cod; Growth; Temperature; Gulf of Saint-Lawrence.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00448/55966/57472.pdf

Biological data extraction from imagery - How far can we go? A case study from the Mid-Atlantic Ridge
Provedor de dados: 5
Autores: Cuvelier, Daphne; De Busserolles, Fanny; Lavaud, Romain; Floc'H, Estelle; Fabri, Marie-claire; Sarradin, Pierre-marie; Sarrazin, Jozee.
In the past few decades, hydrothermal vent research has progressed immensely, resulting in higher-quality samples and long-term studies. With time, scientists are becoming more aware of the impacts of sampling on the faunal communities and are looking for less invasive ways to investigate the vent ecosystems. In this perspective, imagery analysis plays a very important role. With this study, we test which factors can be quantitatively and accurately assessed based on imagery, through comparison with faunal sampling. Twelve instrumented chains were deployed on the Atlantic Eiffel Tower hydrothermal edifice and the corresponding study sites were subsequently sampled. Discrete, quantitative samples were compared to the imagery recorded during the experiment....
Tipo: Text
Palavras-chave: Hydrothermal vents; Image analyses; Deep ocean; Taxonomic diversity; Mid-Atlantic Ridge; Data processing; Benthic ecology.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00117/22868/21643.pdf

Deciphering the molecular adaptation of the king scallop (Pecten maximus) to heat stress using transcriptomics and proteomics
Provedor de dados: 5
Autores: Artigaud, Sebastien; Richard, Joelle; Thorne, Michael A. S.; Lavaud, Romain; Flye-sainte-marie, Jonathan; Jean, Fred; Peck, Lloyd S.; Clark, Melody S.; Pichereau, Vianney.
Background: The capacity of marine species to survive chronic heat stress underpins their ability to survive warming oceans as a result of climate change. In this study RNA-Seq and 2-DE proteomics were employed to decipher the molecular response of the sub-tidal bivalve Pecten maximus, to elevated temperatures. Results: Individuals were maintained at three different temperatures (15, 21 and 25 degrees C) for 56 days, representing control conditions, maximum environmental temperature and extreme warming, with individuals sampled at seven time points. The scallops thrived at 21 degrees C, but suffered a reduction in condition at 25 degrees C. RNA-Seq analyses produced 26,064 assembled contigs, of which 531 were differentially expressed, with putative...
Tipo: Text
Palavras-chave: Marine biology; Metabolism; DNA repair; Transcription regulation; Apoptosis; Energy reserves.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00301/41173/40360.pdf

Feeding and energetics of the great scallop, Pecten maximus, through a DEB model
Provedor de dados: 5
Autores: Lavaud, Romain; Flye-sainte-marie, Jonathan; Jean, Fred; Emmery, Antoine; Strand, Oivind; Kooijman, Sebastiaan A. L. M.
We developed a full life-cycle bioenergetic model for the great scallop P. maximusrelying on the concepts of the Dynamic Energy Budget (DEB) theory. The covariation method was implemented to estimate the parameters of a standard DEB model. Such models are able to predict various metabolic processes from a food availability marker and temperature in the environment. However, suspension-feeders are likely to feed on various trophic sources, from microalgae cells to detritus. They are also able to sort and select food particles very efficiently, depending on their size, energetic value or quality. The present model includes a mechanistic description of the feeding processes, based on Kooijman’s Synthesizing Unit principle which allow to deal with several food...
Tipo: Text
Palavras-chave: Pecten maximus; DEB theory; Synthesizing Units; Phytoplankton; Feeding process; Bay of Brest.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00162/27316/28458.pdf

A coupled biophysical model for the distribution of the great scallop Pecten maximus in the English Channel
Provedor de dados: 5
Autores: Le Goff, Clement; Lavaud, Romain; Cugier, Philippe; Jean, Fred; Flye-sainte-marie, Jonathan; Foucher, Eric; Desroy, Nicolas; Fifas, Spyros; Foveau, Aurelie.
In this paper we used a modelling approach integrating both physical and biological constraints to understand the biogeographical distribution of the great scallop Pecten maximus in the English Channel during its whole life cycle. A 3D bio-hydrodynamical model (ECO-MARS3D) providing environmental conditions was coupled to (i) a population dynamics model and (ii) an individual ecophysiological model (Dynamic Energy Budget model). We performed the coupling sequentially, which underlined the respective role of biological and physical factors in defining P. maximus distribution in the English Channel. Results show that larval dispersion by hydrodynamics explains most of the scallop distribution and enlighten the main known hotspots for the population,...
Tipo: Text
Palavras-chave: Population dynamic model; Ecophysiological model; English Channel; Pecten maximus; Spatial distribution.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00355/46642/46467.pdf