Consulta: subjectFacets:"Environmental factor"
Registros recuperados: 4
Data/hora: 01/06/2024 19:05:16

Phenotype plasticity, local adaptation, and biofouling influence on growth of the pearl oyster Pinctada margaritifera: A common garden approach
Provedor de dados: 5
Autores: Hulot, V.; Saulnier, Denis; Latchere, O.; Maihota, N.; Gaertner-mazouni, N.
The purpose of our study is to investigate (1) the influence of phenotype plasticity and local adaptation on pearl-oyster physiology by testing the persistence of growth differentiation of two pearl oyster populations (Arutua and Mangareva) in common garden experiment; (2) to quantify the influence of biofouling development on the growth of each pearl oyster population. According to our observations, the growth rate in terms of total oyster weight suggested better growth performance of the pearl oyster Pinctada margaritifera in Mangareva (0.21–0.24 ± 0.01 g.day−1) than Arutua (0.14–0.15 ± 0.01 g.day−1). However, similar growth performances are observed at the Vairao common garden site for oyster stocks from Mangareva (0.07 ± 0.01 mm.day−1 or...
Tipo: Text
Palavras-chave: Pearl oyster; Growth performance; Biofouling; Endogenous factor; Environmental factor; Common garden experiment.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00507/61866/65934.pdf

Pollution et taux d'aneuploïdie chez l'huître creuse Crassostrea gigas: étude expérimentale sur une population en milieu contrôlé
Provedor de dados: 5
Autores: Bouilly, Karine.
Aneuploidy has previously been reported in wild and cultivated Pacific oysters, Crassostrea gigas, and it has been shown to be negatively correlated with growth. This is especially important since high variability of growth rate is one of the major problems in the aquacultural production of this species. The existence of an environmental factor (such as atrazine contamination) with an effect on aneuploidy level was first investigated through the study of a population of Crassostrea gigas subjected to different concentrations of atrazine. The treatments applied represent peak values found in the environment (0,01 mg/l) plus a value ten times higher (0,1 mg/l). Our results have shown that although atrazine did not have an effect on the mortality of adult...
Tipo: Text
Palavras-chave: Huître creuse; Crassostrea gigas; Aneuploïdie; Facteur environnemental; Atrazine; Aneuploidy; Pacific oysters; Crassostrea gigas; Environmental factor; Atrazine.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00428/53932/55060.pdf

Bacterivory in the common foraminifer Ammonia tepida: Isotope tracer experiment and the controlling factors
Provedor de dados: 5
Autores: Pascal, P.y.; Dupuy, C; Richard, P; Niquil, N.
The majority of sediment dweller foraminifera are deposit feeders. They use their pseudopodia to gather sediment with associated algae, organic detritus and bacteria. Uptake of bacteria by foraminifera have been observed but rarely quantified. We measured uptake of bacteria by the common foraminifera Ammonia tepida using 15N pre-enriched bacteria as tracers. In intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental parameters. Grazing experiments were performed in order to measure effects of abiotic (temperature, salinity and irradiance) and biotic (bacterial and algal abundances) factors on uptake rates of bacteria. In mean conditions, A. tepida grazed 78 pgC ind-1 h-1 during the first eight hours of incubation,...
Tipo: Text
Palavras-chave: Trophoecology; Prey abundance; Mudflat; Grazing; Foraminifera; Environmental factor; Bacteria.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4298.pdf

Bacterivory of a mudflat nematode community under different environmental conditions
Provedor de dados: 5
Autores: Pascal, P.y.; Dupuy, C; Richard, P; Rzeznik-orignac, J; Niquil, Nathalie.
The fate of the benthic bacterial biomass is a topic of major importance in understanding how softbottom environments function. Because of their high abundance, production and nutritional value, benthic bacteria may constitute an important food resource for benthic fauna. The trophic role of bacteria for a nematode community on the Brouage mudflat (Marennes-Ole´ron-France), dominated by three species: Chromadora macrolaima (64% of the abundance), Daptonema oxycerca (15%) and Ptycholaimellus jacobi (8%), was determined in grazing experiments using 15N pre-enriched bacteria. On intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental conditions. Grazing experiments were performed in order to measure the effects of...
Tipo: Text
Palavras-chave: Mudflat; Environmental factor; Grazing; Bacteria; Nematode.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4295.pdf