Consulta: creatorFacets:"Comtet, Thierry"
Registros recuperados: 13
Data/hora: 08/06/2024 16:23:02

Vertical distribution of brittle star larvae in two contrasting coastal embayments: implications for larval transport
Provedor de dados: 5
Autores: Guillam, Morgane; Bessin, Claire; Blanchet-aurigny, Aline; Cugier, Philippe; Nicolle, Amandine; Thiébaut, Éric; Comtet, Thierry.
The ability of marine invertebrate larvae to control their vertical position shapes their dispersal pattern. In species characterized by large variations in population density, like many echinoderm species, larval dispersal may contribute to outbreak and die-off phenomena. A proliferation of the ophiuroid Ophiocomina nigra was observed for several years in western Brittany (France), inducing drastic changes on the benthic communities. We here studied the larval vertical distribution in this species and two co-occurring ophiuroid species, Ophiothrix fragilis and Amphiura filiformis, in two contrasting hydrodynamic environments: stratified in the bay of Douarnenez and well-mixed in the bay of Brest. Larvae were collected at 3 depths during 25 h within each...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75321/75846.pdf

Reproductive biology, sexual dimorphism, and population structure of the deep sea hydrothermal vent scale-worm, Branchiplynoee seepensis (Polychaeta : Polynoidae)
Provedor de dados: 5
Autores: Jollivet, D; Empis, A; Baker, Mc; Hourdez, S; Comtet, Thierry; Jouin-toulmond, C; Desbruyeres, Daniel; Tyler, Pa.
The polychaete family Polynoidae (scale-worms) is well-represented at deep sea hydrothermal vents. Most species are free-living in a wide range of habitats: from high-temperature hydrothermal `chimney' walls to diffuse venting areas. Conversely, species of the genus Branchipolynoe live inside the mantle cavity of vent and seep mytilids. Specimens, morphologically close to Branchipolynoe seepensis, have been reported from all the known vent areas on the Mid-Atlantic Ridge (MAR), with varying infestation rates (0¿6 individuals per host). Reproductive tract, gametogenesis and population structures were examined for specimens from the Lucky Strike vent field (MAR) in order to test whether this species displays dwarf males, protandric hermaphroditism or...
Tipo: Text
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-615.pdf

Ecology of the Menez Gwen hydrothermal vent field (Mid-Atlantic Ridge Azores Triple Junction)
Provedor de dados: 5
Autores: Colaco, Ana; Desbruyeres, Daniel; Comtet, Thierry; Alayse, Anne-marie.
Tipo: Text
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00178/28967/27388.pdf

First record of the microsporidian parasite Steinhausia mytilovum in Mytilus sp (Bivalvia : Mytilidae) from France
Provedor de dados: 5
Autores: Comtet, Thierry; Garcia, Celine; Le Coguic, Yvette; Joly, Jean-pierre.
Steinhausia mytilovuln is a globally distributed microsporidian parasite which infects the oocytes of the blue mussels Mytilus edulis and M. galloprovincialis. Despite the intensive monitoring effort made on mussel populations, the parasite has not previously been reported in France. We report herein on the occurrence of S. mytilovum in Mytilus sp. from 1 cultured and 2 natural populations on the northern coast of France, thus extending the parasite's known distribution northwards. We also report on the observation in 1989 of S. mytilovum in M, galloprovincialis from the Golfe de Fos area in the Mediterranean Sea (South of France), S. mytilovum was observed in the European hybrid zone between M. edulis and M. galloprovincialis, which therefore renders the...
Tipo: Text
Palavras-chave: Aquaculture; Parasite; Microsporicha; Steinhausia mytilovum; Mytilus galloprovincialis; Mytilus edulis.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-2862.pdf

Brief account of the chemical environment at hydrothermal vent mussel beds on the MAR
Provedor de dados: 5
Autores: Sarradin, Pierre-marie; Caprais, Jean-claude; Riso, Ricardo; Comtet, Thierry; Aminot, Alain.
Tipo: Text
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00186/29765/28199.pdf

Metabarcoding on planktonic larval stages: an efficient approach for detecting and investigating life cycle dynamics of benthic aliens
Provedor de dados: 5
Autores: Couton, Marjorie; Comtet, Thierry; Le Cam, Sabrina; Corre, Erwan; Viard, Frédérique.
High-throughput sequencing (HTS) technologies offer new promise to support surveillance programs targeting marine non-indigenous species (NIS). Metabarcoding might surpass traditional monitoring methods, for example through its ability to detect rare species, a key feature in early detection of NIS. Another interest of this approach is the identification of organisms difficult to identify based on morphology only (e.g., early developmental stages), making it relevant in the context of management programs. Because many marine benthic NIS have a biphasic benthopelagic life cycle, targeting their pelagic larval stages in zooplankton may allow early detection and assessment of their establishment and potential spread. We illustrate this approach with an...
Tipo: Text
Palavras-chave: Zooplankton; Time-series; Non-indigenous species; Estuary; High-throughput sequencing; Surveillance; Monitoring.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00599/71127/69442.pdf

Can encapsulated embryos of Crepidula fornicata (L.) use extracapsular dissolved organic matter? An experimental study with a 13C-enriched amino acid
Provedor de dados: 5
Autores: Leroy, Fanny; Comtet, Thierry; Brante, Antonio; Leroux, Cedric; Riera, Pascal.
Many marine gastropod species brood their embryos in thin-walled capsules to protect them during development. Despite its beneficial effects, encapsulation has two major constraints, nutrition and oxygen supply, which affect embryo development and larval survival. Developing embryos usually rely on intracapsular food sources provided by the mother, in the form of yolk, nurse eggs and intracapsular fluid. However, it is still not clear if they are able to feed on extracapsular sources that may cross the capsule wall. We investigated this possibility in the calyptraeid species Crepidula fornicata. In this species, the internal capsule wall thickness sharply decreases during embryonic development, which might change wall permeability to small organic...
Tipo: Text
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00374/48507/48774.pdf

New information on the ecology of deep-sea vent communities in the azores triple junction area : preliminery results of the Diva 2 cruise (May 31-July 4, 1994)
Provedor de dados: 5
Autores: Desbruyeres, Daniel; Alayse, Anne-marie; Antoine, Elisabeth; Barbier, Georges; Barriga, Fjas; Biscoito, Manuel; Briand, Patrick; Brulport, Jean-pierre; Comtet, Thierry; Cornec, Laurence; Crassous, Philippe; Dando, Paul; Fabri, Marie-claire; Felbeck, Horst; Lallier, Francois; Fiala Medioni, Aline; Goncalves, Joao; Menard, Frederic; Kerdoncuff, Jacques; Patching, John; Saldanha, Luis; Sarradin, Pierre-marie.
Tipo: Text
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00179/29005/27432.pdf

Meroplankton distribution and its relationship to coastal mesoscale hydrological structure in the northern Bay of Biscay (NE Atlantic)
Provedor de dados: 5
Autores: Ayata, Sakina-dorothee; Stolba, Robin; Comtet, Thierry; Thiebaut, Eric.
The relationship between meroplankton distribution and spatio-temporal variability of coastal mesoscale hydrological structure was investigated in the northern Bay of Biscay, North-East Atlantic. For the three coastal polychaetes studied, i.e. Pectinaria koreni, Owenia fusiformis and Sabellaria alveolata, the highest larval abundances were sampled in low-salinity, low-density and high-temperature river plume waters. For two species (P. koreni and O. fusiformis), maximal abundances were observed in the surface and thermocline layers due to ontogenic migrations. Variance partitioning based on multiple regression and redundancy analyses was used to assess the relative roles played by the hydrological environment alone, the geographical space alone and their...
Tipo: Text
Palavras-chave: Meroplankton; Larval transport; Mesoscale structures; River plume; Fronts; Owenia fusiformis; Pectinaria koreni; Sabellaria alveolata; Bay of Biscay.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00240/35131/33632.pdf

Seasonal Variations in Maternal Provisioning of Crepidula fornicata (Gastropoda): Fatty Acid Composition of Females, Embryos and Larvae
Provedor de dados: 5
Autores: Leroy, Fanny; Meziane, Tarik; Riera, Pascal; Comtet, Thierry.
Recruitment success of marine invertebrate populations not only depends on the number of recruits but also on their quality which affects their survival. In species characterized by a mixed development (encapsulated embryonic development and release of planktotrophic larvae), the offspring quality depends on both maternal provisioning and larval feeding. Here, we investigated potential changes of maternal provisioning over the whole reproductive period in a gastropod with a mixed development: Crepidula fornicata. In its introduction area, C. fornicata reproduces from February to October, which implies that both adults and larvae are exposed to different food availabilities. Maternal provisioning was assessed by measuring the fatty acid (FA) composition of...
Tipo: Text
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00374/48498/48825.pdf

Population structure and recruitment in mytilid bivalves from the Lucky Strike and Menez Gwen hydrothermal vent fields (37°17'N and 37°50'N on the Mid-Atlantic Ridge)
Provedor de dados: 5
Autores: Comtet, Thierry; Desbruyeres, Daniel.
Population structure and recruitment pattern of undescribed mytilid bivalves that dominate the animal communities associated with vents of the Lucky Strike and Menez Gwen hydrothermal vent fields (37 degrees 17' N and 37 degrees 50' N on the Mid-Atlantic Ridge) were studied from size-frequency analyses. Intra-site comparisons reveal that length-frequency distributions differ significantly from one location to the other. This spatial segregation of the sizes could be due to spatio-temporal variability in environmental conditions and to intraspecific competition processes, especially adult-larval interactions (competition for space and food resources, intraspecific larviphagy) that could prevent larvae from settling on surfaces covered by adults. A modal...
Tipo: Text
Palavras-chave: Hydrothermal vents; Mytilidae; Recruitment; Population structure; Size frequency; Spatial segregation; Intraspecific competition; Mid-Atlantic Ridge.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00446/55799/62521.pdf

Bilan 2000 du réseau REPAMO - Réseau National de surveillance zoosanitaire des mollusques marins
Provedor de dados: 5
Autores: Thebault, A; Robert, M.; Chollet, Bruno; Dumais, Muriel; Joly, Jean-pierre; Garcia, C.; Comtet, Thierry; Le Coguic, Matthieu; Martin, Anne-genevieve; Pichot, Yves.
Tipo: Text
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00080/19111/16706.pdf

Viral gametocytic hypertrophy of Crassostrea gigas in France: from occasional records to disease emergence?
Provedor de dados: 5
Autores: Garcia, Celine; Robert, Maeva; Arzul, Isabelle; Chollet, Bruno; Joly, Jean-pierre; Miossec, Laurence; Comtet, Thierry; Berthe, Franck.
Viral gametocytic hypertrophy was reported for the first time in 2001 in Pacific oyster Crassostrea gigas in France. Since this date, the number of reported cases and the distribution area have increased every year; however, the cases are not associated with macroscopic signs or increased mortality rates. Both male and female gametes were hypertrophied and basophilic inclusions were observed in gamete nuclei, Transmission electron microscopy revealed the presence of viral particles in these intranuclear basophilic inclusions. These particles had characteristics similar to those of the Papillomaviridae and Polyomaviridae families: they were small, non-enveloped, icosahedral, and 44 to 56 nm in diameter, The viral particles were found in male, female and...
Tipo: Text
Palavras-chave: Polyomaviridae; Papillomaviridae; Gonad; Viral garnetocytic hypertrophy; Pacific oyster; Crassostrea gigas.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3288.pdf