Consulta: creatorFacets:"Hawkins, Ajs"
Registros recuperados: 4
Data/hora: 10/06/2024 10:13:00

Novel observations underlying the fast growth of suspension-feeding shellfish in turbid environments: Mytilus edulis
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hawkins, Ajs; Smith, Rfm; Bayne, Bl; Heral, Maurice.
For the tirst time for any benthic filter-feeder, this study documents each component process of nutrient acquisition through natural tidal variations of food availabillty. The organic content of seston available during both neap and spring tides in the bay of Marennes-Oléron. France, decreased from 28 to 8 % with mcreasing seston concentration from 10 to about 90 mg total particulate mass 1(1). Throughout this tidal variation, the blue mussel Mylilus edulis L. cleared more water of particles as seston availability increased. Rejection of fillered material as pseudofaeces prior to ingestion remained a constant fraction of about 0 .93 x the mass of filtered material, so that ingestion rate showed no signs of stabilising at even the highest food...
Tipo: Text
Palavras-chave: Seston composition; Tidal variation; Mussel; Mytilus edulis; Feeding behaviour; Selection efficiency; Absorption efficiency; Net energy balance.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00040/15080/12419.pdf

Separate effects of triploidy, parentage and genomic diversity upon feeding behaviour, metabolic efficiency and net energy balance in the Pacific oyster Crassostrea gigas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hawkins, Ajs; Magoulas, A; Heral, Maurice; Bougrier, Serge; Naciri-graven, Y; Day, Aj; Kotoulas, G.
Triploid oysters were induced using cytochalasin B upon retention of either the first (meiosis I triploids) or the second (meiosis II triploids) polar body in embryos from a single cohort derived from mixed parentage. Allozyme and microsatellite assays enabled the confirmation of both parentage and triploidy status in each oyster. Comparison of meiosis I triploids, meiosis II triploids and diploid siblings established that improved physiological performance in triploids was associated with increased allelic variation, rather than with the quantitative dosage effects of ploidy status. An unidentified maternal in¯uence also interacted with genotype. Among full sibs, allelic variation measured as multi-locus enzyme heterozygosity accounted for up to 42% of...
Tipo: Text
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-2716.pdf

Manipulation of dietary conditions for maximal growth in mussels, Mytilus edulis, from the Marennes-Oléron Bay, France
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hawkins, Ajs; Smith, Rfm; Bougrier, Serge; Bayne, Bl; Heral, Maurice.
Results are presented from laboratory-based experiments in which we investigated short-term responses of Mytilus edulis L. to experimental changes in the amount and composition of suspended seston. Working with large quantities of cultured algae, we have studied feeding behaviour over ranges of food availability and quality that ex tend weil beyond earlier limits. Findings confirm the ability of mussels to selectively reject inorganic particles as pseudofaeces prior to ingestion, thereby enriching the organic content of ingested matter by 30% more than the organic content of natural filtered seston. Our findings also establish acclimation both of selective and absorptive processes, indicating that the extent to which growth of M. edulis can be stimulated...
Tipo: Text
Palavras-chave: Mytilus edulis; Comportement alimentaire; Régulation; Croissance.; Mytilus edulis; Feeding behaviour; Regulation; Maximum growth rate.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00015/12604/9482.pdf

Feeding behaviour of the mussel, Mytilus edulis : responses to variations in quantity and organic content of the seston
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bayne, Bl; Iglesias, Jip; Hawkins, Ajs; Navarro, E; Heral, Maurice; Deslous Paoli, Jean-marc.
Mussels were fed four concentrations of seston (between 0•99 and 10•3mgtotalseston P), comprising three levels of organic content (71•9, 63•6 and 40•8%), made up from natural silt and two species of cultured phytoplankton. Two of the seston concentrations were below, and two above, the threshold at which pseudofaeces were produced. Measurements of physiological traits (filtration rates, pseudofaeces production, selection efficiency, absorption efficiency, absorption rates and rates of oxygen consumption) were made after 2 days and, for two of the seston concentrations, also after 12 days. When fed at a high concentration of seston of low organic content, the mussels increased their filtration rate, rejected a higher proportion of filtered material as...
Tipo: Text
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/publication-3069.pdf