Consulta: subjectFacets:"Crassostrea gasar"
Registros recuperados: 6
Data/hora: 02/06/2024 13:01:28

Trans-Atlantic distribution of a mangrove oyster species revealed by 16S mtDNA and karyological analyses
Provedor de dados: 5
Autores: Lapegue, Sylvie; Boutet, Isabelle; Leitao, Alexandra; Heurtebise, Serge; Garcia, P; Thiriot Quievreux, C; Boudry, Pierre.
Three species of man.-rove oysters, Crassostrea rhizophorae, C. brasiliana, and C. gasar, have been described along the Atlantic shores of South America and Africa. Because the distribution of these molluscs is of great biological and commercial interest, their taxonomy and distribution deserve further clarification. Therefore, 15 populations were sampled from both continents. Their 16S mitochondrial polymorphism was studied by sequencing and PCR-RFLP analysis. Two haplotypes were identified. Haplotype a was the only one observed in Africa, but it was also observed in South America together with haplotype b. Because C. gasar is the only mangrove oyster identified on the west coast of Africa, haplotype a was attributed to this species, which has thus been...
Tipo: Text
Palavras-chave: Mangrove oyster; Crassostrea gasar; Karyotype; Phylogeography; 16S mitochondrial DNA.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-2790.pdf

Phylogéographie des huîtres creuses des mangroves de l'Atlantique Sud par l'apport des marqueurs moléculaires
Provedor de dados: 5
Autores: Verdon, Beatrice.
La taxonomie des huîtres est longtemps restée basée sur des critères morphologiques tel que la coquille et les organes internes ou sur la répartition géographique. Ces critères se révèlent aujourd'hui peut fiable du fait de la grande plasticité des caractères morphologiques des huîtres en fonction des conditions environnementales, et du transport d'espèce par l'ostréiculture ou accidentellement. La biologie moléculaire et en particulier les marqueurs génétiques sont des outils très utiles pour différencier les espèces. La phylogéographie des huîtres creuses de l'Atlantique Sud a ainsi été étudié grâce à différentes méthodes d'observation du polymorphisme de l'ADN. Ces techniques ont dans un premier temps été appliquées à des fragments mitochondriaux (16S)...
Tipo: Text
Palavras-chave: Huître creuse; Crassostrea gasar; Génétique des populations; Marqueurs nucléaires.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00033/14409/11706.pdf

Etude des ressources génétiques chez les huîtres creuses
Provedor de dados: 5
Autores: Boudry, Pierre; Heurtebise, Serge; Lapegue, Sylvie; Lam, Katherine; Mccombie, Helen; Leitao, Alexandra; Gerard, Andre.
L'étude de la variabilité génétique de l'huître creuse Crassostrea gigas est un point essentiel dans la mise en place de programmes de gestion des ressources génétiques et de sélection chez cette espèce. C. gigas, originaire du Japon, a été introduite dans de nombreuses régions du monde et représente aujourd'hui plus de 95 'ro de la production mondiale d'huîtres. Introduite en France au début des années 1970 pour remplacer l'huître portugaise Crassostrea angulata, c'est aujourd'hui une ressource de première importance pour notre région. Malgré la maîtrise du cycle de reproduction de l'espèce et son importance commerciale, elle n'a pas été génétiquement améliorée et on peut donc considérer les stocks comme « sauvages» ou « non domestiqués ». De plus, la...
Tipo: Text
Palavras-chave: Génétique; Huîtres creuses; Crassostrea gigas; Crassostrea gasar; Variabilité génétique.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00199/31008/29411.pdf

Phylogeography of mangrove oysters from the Southern Atlantic ocean : Crassostrea gasar and Crassostre rhizophorae
Provedor de dados: 5
Autores: Lapegue, Sylvie; Boutet, Isabelle; Leitao, Alexandra; Thiriot-quievreux, Catherine; Heurtebise, Serge; Garcia, P.; Boudry, Pierre.
Mangrove oysters encompass several species and their taxomony is unclear. Among then, Crassostrea rhizophorae has been described along the Central and South American Atlantic coasts and Crassostrea gasar along African Atlantic coasts. Most taxonomic studies have so far been based on morphological criteria which are particularly susceptible to plasticity and new insight can be provided by molecular markers. The present work aims to provide information on the phylogeography of these two taxa.
Tipo: Text
Palavras-chave: Genetic; Phylogeography; Crassostrea rhizophorae; Crassostrea gasar; Mangrove oysters.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/acte-3496.pdf

Phylogéographie des huîtres de mangrove de l'Océan Atlantique Sud : C. gasar et C. rhisophorae
Provedor de dados: 5
Autores: Heurtebise, Serge; Boutet, Isabelle; Verden, B.; Lapegue, Sylvie; Leitao, Alexandra; Thiriot-quievreux, Catherine; Garica, P.; Boudry, Pierre.
Mangrove oysters include various species that are also present on different coasts. In the southern part of the Atlantic Ocean, Crassostrea rhizophorae has been observed along the southern coast of America and Crassostrea gasar along the western coast of Africa. Fifteen populations of these oysters were sampled from these two geographic areas. Their polymorphism was studied on the 16S mitochondrial fragment both by par sequencing and RFLP analysis. Some samples' caryotype were also analysed. Two haplotypes were identified: C. gasar was found in Africa, but also for the first time in South America, whereas C. rhizophorae was only found on the coasts of South America.
Tipo: Text
Palavras-chave: Crassostrea rhizophorae; Crassostrea gasar; Huîtres; Génétique; Phylogéographie.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/acte-3278.pdf

Ressources génétiques chez les huîtres creuses : conservatoire de souche et marqueurs moléculaires
Provedor de dados: 5
Autores: Boudry, Pierre; Heurtebise, Serge; Collet, Bertrand; Cornette, Florence; Ledu, Christophe; Phelipot, Pascal; Gerard, Andre.
The cupped oyster strain bank was created at Ifremer at La Tremblade in 1992. It was funded by the Poitou-Charentes regional council. Its goals were: 1. to study the intra- and interspecific genetic differentiation within the genus Crassostrea. 2. to study acclimatization potential of foreign oysters in French waters in order to identify species that could replace Crassostrea gigas in case of a major disease outbreak in C. gigas or in case of a need or desire to diversify shellfish production. 3. to study the possibility of interspecific hybridisation in the genus Crassostrea and hybrid performance.
Tipo: Text
Palavras-chave: Saccostrea commercialis; Crassostrea rhisophorae; Crassostrea gasar; Crassostrea sikamea; Crassostrea virginica; Crassostrea rivularis; Crassotea angulata; Crassostrea gigas; Génétique.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/acte-3242.pdf