Consulta: creatorFacets:"Jean, Fred"
Registros recuperados: 12
Data/hora: 08/06/2024 17:30:30

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

Sources of paralytic shellfish toxin accumulation variability in the Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Pousse, Emilien; Flye-sainte-marie, Jonathan; Alunno-bruscia, Marianne; Hegaret, Helene; Jean, Fred.
This study was designed to assess the contribution of feeding behavior to inter-individual variability of paralytic shellfish toxin (PST) accumulation in the Pacific oyster Crassostrea gigas. For this purpose 42 oysters were exposed for 2 days to non-toxic algae and then for 2 other days to the PST producer Alexandrium minutum. Individual clearance rate (CR) of oysters was continuously monitored over the 4 days using an ecophysiological measurement system. Comparison of CR values when exposed to toxic and non toxic algae allowed to estimate a clearance rate inhibition index (CRII). Toxin concentration of oysters was quantified at the end of the experiment. These data allowed to estimate the toxin accumulation efficiency (TAE) as the ratio of toxin...
Tipo: Text
Palavras-chave: Alexandrium minutum; Paralytic shellfish poisoning; Accumulation; Clearance rate; Feeding behavior; Pacific oyster.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00416/52789/53688.pdf

Impact of Brown Ring Disease on the energy budget of the Manila clam Ruditapes philippinarum
Provedor de dados: 5
Autores: Flye Sainte Marie, Jonathan; Pouvreau, Stephane; Paillard, Christine; Jean, Fred.
Brown Ring Disease (BRD) is a bacterial disease caused by the pathogen, Vibrio tapetis. The disease induces formation of a brown deposit on inner shell of the Manila clam, Ruditapes philippinarum. Development of this disease is correlated with a decrease in the condition index of infected clams. Experiments were conduced in order to assess the effect of the development of BRD on two parameters affecting the energy balance of the clams: the clearance and the respiration rates. Experiments were performed in a physiological measurement system that allowed simultaneous measures of clearance and respiration rates. During both acclimation and measurements clams were fed with cultured T-iso and temperature was close to seasonal field temperature (10 degrees C....
Tipo: Text
Palavras-chave: Ruditapes philippinarum; Respiration rate; Filtration; Energy budget; Clearance rate; Brown Ring Disease.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3013.pdf

Individual-based simulation of the spatial and temporal dynamics of macroinvertebrate functional groups provides insights into benthic community assembly mechanisms
Provedor de dados: 5
Autores: Alexandridis, Nikolaos; Bacher, Cedric; Desroy, Nicolas; Jean, Fred.
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 patterns to emerge from first principles about the modeled organisms. Previous work in the Rance estuary (Brittany, France) revealed the principal functional components of its benthic macroinvertebrate communities and derived a set of functional relationships between them. These elements were combined here for the development of a dynamic and spatially explicit model that operates at two spatial scales. At the...
Tipo: Text
Palavras-chave: Individual-based model; Inter-scale modeling; Functional groups; Benthic macroinvertebrates; Community assembly; Biological traits; Biotic interactions; Alpha-diversity; Beta-diversity; Rance estuary.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00445/55654/57319.pdf

Qualitative modelling of functional relationships in marine benthic communities
Provedor de dados: 5
Autores: Alexandridis, Nikolaos; Dambacher, Jeffrey M.; Jean, Fred; Desroy, Nicolas; Bacher, Cedric.
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 controlled by readily available biological traits, making trait-based modelling an ideal framework for the synthesis of relevant hypotheses from ecological theory and expert knowledge. With the help of benthic species traits, we derived a set of first principles regarding the role of organisms in processes of environmental filtering, consumption of algae/detritus, predation, use of space, biogenic habitat modification...
Tipo: Text
Palavras-chave: Benthic macroinvertebrates; Biological traits; Biotic interactions; Community assembly; Functional groups; Qualitative modelling.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00394/50587/51411.pdf

Modelling paralytic shellfish toxins (PST) accumulation in Crassostrea gigas by using Dynamic Energy Budgets (DEB)
Provedor de dados: 5
Autores: Pousse, Emilien; Flye-sainte-marie, Jonathan; Alunno-bruscia, Marianne; Hegaret, Helene; Rannou, Eric; Pecquerie, Laure; Marques, Goncalo M.; Thomas, Yoann; Castrec, Justine; Fabioux, Caroline; Long, Marc; Lassudrie, Malwenn; Hermabessiere, Ludovic; Amzil, Zouher; Soudant, Philippe; Jean, Fred.
As other filter-feeders, Crassostrea gigas can concentrate paralytic shellfish toxins (PST) by consuming dinoflagellate phytoplankton species like Alexandrium minutum. Intake of PST in oyster tissues mainly results from feeding processes, i.e. clearance rate, pre-ingestive sorting and ingestion that are directly influenced by environmental conditions (trophic sources, temperature). This study aimed to develop a mechanistic model coupling the kinetics of PST accumulation and bioenergetics in C. gigas based on Dynamic Energy Budget (DEB) theory. For the first time, the Synthesizing Units (SU) concept was applied to formalize the feeding preference of oysters between non-toxic and toxic microalgae. Toxin intake and accumulation were both dependent on the...
Tipo: Text
Palavras-chave: Alexandrium minutum; Paralytic shellfish toxins (PST); Dynamic Energy Budget (DEB); Modelling; Pacific oyster.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00455/56662/58407.pdf

A quantitative estimation of the energetic cost of brown ring disease in the Manila clam using Dynamic Energy Budget theory
Provedor de dados: 5
Autores: Flye Sainte Marie, Jonathan; Jean, Fred; Paillard, Christine; Kooijman, Sebastiaan.
Brown ring disease (BRD) in the Manila clam, Ruditapes philippinarum, is a bacterial disease caused by the pathogen Vibrio tapetis. This disease induces the formation of a characteristic brown conchiolin deposit on the inner shell and is associated with a decrease in condition index indicating that the development of the disease affects the energy balance of the clam. A previous study showed that the energy budget of the host was affected by a decrease in filtration activity, and hypothesized that a second way to degrade the energy balance was the increase in maintenance costs associated to the cost of immune response and lesion repair. This paper focusses on this second way of degradation of the energy balance.  A starvation experiment confirmed that the...
Tipo: Text
Palavras-chave: Maintenance Cost; Dynamic Energy Budget Theory; Energetic Cost; Energy Budget; Brown Ring Disease; Manila Clam.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6787.pdf

Building functional groups of marine benthic macroinvertebrates on the basis of general community assembly mechanisms
Provedor de dados: 5
Autores: Alexandridis, Nikolaos; Bacher, Cedric; Desroy, Nicolas; Jean, Fred.
The accurate reproduction of the spatial and temporal dynamics of marine benthic biodiversity requires the development of mechanistic models, based on the processes that shape macroinvertebrate communities. The modelled entities should, accordingly, be able to adequately represent the many functional roles that are performed by benthic organisms. With this goal in mind, we applied the emergent group hypothesis (EGH), which assumes functional equivalence within and functional divergence between groups of species. The first step of the grouping involved the selection of 14 biological traits that describe the role of benthic macroinvertebrates in 7 important community assembly mechanisms. A matrix of trait values for the 240 species that occurred in the Rance...
Tipo: Text
Palavras-chave: Assembly mechanisms; Benthic communities; Biological traits; Emergent groups; Functional diversity; Functional redundancy.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00369/47975/48000.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