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| Registros recuperados: 233 | |
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| Bodin, Nathalie; Le Loch, Francois; Hily, Christian; Caisey, Xavier; Latrouite, Daniel; Le Guellec, Anne-marie. |
| The ontogenic variations of nitrogen and carbon stable isotopic signatures (delta N-15 and delta C-13) were investigated in two spider crab (Maja brachydactyla) populations inhabiting in different biotopes of Western Europe. The Iroise Sea population is localized in Western Brittany and characterized by a seasonal migration occurring on a large bathymetric and habitat gradient while the Seine Bay population, in the Eastern English Channel, remains in a more homogeneous environment during its migration. In the Iroise Sea population, delta C-13 Values increased significantly both with body size and age, revealing a shift towards "benthic-component" prey with spider crab growth. On the contrary, neither body size nor ageing gave rise to a significant trophic... |
| Tipo: Text |
Palavras-chave: Migration; Marine decapod crustaceans; Growth; Feeding; Carbon and nitrogen stable isotopes. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2535.pdf |
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| Gonzalez, Ricardo; Mingant, Christian; Petton, Bruno; Robert, Rene. |
| In contrast with the Japanese oyster Crassostrea gigas and the Manila clam Ruditapes philippinarum, Ostrea edulis seed production in the hatchery has been reported to be erratic, with sudden and unexplained larval and post-metamorphosis mortalities. Fecundity and initial larval quality have been related to broodstock conditioning, but effects on larval development and metamorphosis remain poorly understood. In addition, molluscan larval mortalities have been often associated with bacterial contamination and flow-through techniques may help to overcome this problem. Both aspects have been considered in the present work. O. edulis broodstock were conditioned at 19 °C and fed three different microalgal diets. Two were single-species diets: Rhodomonas salina... |
| Tipo: Text |
Palavras-chave: Ostrea edulis; Feeding; Broodstock conditioning; Larval development; Flow-through. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00090/20093/17732.pdf |
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| Djeghri, Nicolas; Atkinson, Angus; Fileman, Elaine S.; Harmer, Rachel A.; Widdicombe, Claire E.; Mcevoy, Andrea J.; Cornwell, Louise; Mayor, Daniel J.. |
| There has been an upsurge of interest in trait-based approaches to zooplankton, modelling the seasonal changes in the feeding modes of zooplankton in relation to phytoplankton traits such as size or motility. We examined this link at two English Channel plankton monitoring sites south of Plymouth (L4 and El). At L4 there was a general transition from diatoms in spring to motile microplankton in summer and autumn, but this was not mirrored in the succession of copepod feeding traits; for example the ambushing Oithona similis dominated during the spring diatom bloom. At nearby El we measured seasonality of food and grazers, finding strong variation between 2014 and 2015 but overall low mesozooplankton biomass (median 4.5 mg C m(-3)). We also made a seasonal... |
| Tipo: Text |
Palavras-chave: Copepod; Zooplankton biomass; Feeding; Selectivity; Intraguild predation; Predator-prey size ratio; Western Channel Observatory; Sloppy feeding. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00616/72783/83484.pdf |
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| Goulletquer, Philippe; Geairon, Philippe; Faury, Nicole; Razet, Daniel; Soletchnik, Patrick; Gras, Paul; Adessi, L.. |
| In European waters, significant economic damages to wooden structures are caused by bivalves molluscs and crustaceans. Treatments like copper-chrome-arsenic mixtures (CCA) were designed to prevent settlement of these wood borer species. However, limited and conflicting evidence regarding the toxicity to non-target organisms are available in the literature. This report aims to provide insights regarding the CCA leachates' toxicity to an important aquaculture species, the blue mussel Mytilus edulis for which much information on normal and stressed physiology is available for purposes of comparisons. The mussels are usually considered as a particularly suitable species for biological monitoring (Smaal and Widdows, 1994). To address the CCA leachate issue, two... |
| Tipo: Text |
Palavras-chave: Bivalvia; Mussel; Mytilus edulis; Copper-chrome-arsenic (CCA); Treatment; Feeding; Absorption. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00043/15437/12788.pdf |
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| Gaudy, R; Pagano, M; Cervetto, G; Saintjean, L; Verriopoulos, G; Beker, B. |
| Feeding, respiration, and ammonia excretion of Acartia tonsa were studied in a brackish lagoon, near Marseilles (Southern France). The experiments were performed during the same season in two successive years, using naturally occurring particles as food. Strong variations in both quantity and quality of food particles were recorded between the two series of experiments. The ingestion of particles according to their size was studied by means of the Coulter Counter technique. Females ingested more food than males. In both sexes, there was a tendency to select median to large particles, regardless of the shape of the particles-size spectrum. In 1990, the specific production rate, deduced from the energy budget, was equivalent to or greater than the observed... |
| Tipo: Text |
Palavras-chave: Acartia tonsa; Feeding; Metabolism; Production. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00096/20731/18368.pdf |
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| Sauriau, P; Baud, Jean-pierre. |
| Based on Coulter Counter data, a new method is proposed to study the influence of the polymorphous variability in size as well as in shape of the diatom species Skeletonema costatum on the physiological performances of the Manila clam Ruditapes philippinarum . Three conditions are required in order to convert volumetric data determined with the Coulter Counter into metric data, i.e. (1) stability of the pervalvar diameter of the diatom chains, (2) statistical independence between length and pervalvar diameter of the diatom chains, and (3) negligible level of coincident passages through the aperture orifice. Under these three conditions, the mean length (l) of a S. costatum chain can be related to the mean pervalvar diameter (d) of diatom chains and to the... |
| Tipo: Text |
Palavras-chave: Bivalvia; Skeletonema costatum; Bacillariophyceae; Algae; Physiology; Biopolymorphism; Counters; Size; Size distribution; Feeding; Nutrition. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/acte-1670.pdf |
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| Barille, Laurent; Prou, Jean. |
| Feeding and growth of the Japanese oyster Crassostrea gigas is simulated by a deterministic model. However, physiological processes, estimated by statistical relationships, have not been tested under extreme environmental conditions such as high level of suspended particulate matter. Ecophysiological experiments were therefore conducted in situ in the Bay of Marennes-Oléron during a spring and neap tide cycle in May 1991, to get a better representation of 2 important components of the energy budget of the Japanese oyster: clearance rate and selection efficiency. The relationships previously established by Raillard et al. (1993) are re-evaluated by integrating the action of high seston load, typical of tidal effect within estuaries, on the physiological... |
| Tipo: Text |
Palavras-chave: Tidal cycles; Oysters culture; Growth; Feeding; Energy budget; Ecophysiology. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/acte-3827.PDF |
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| Day, Louise; Kopp, Dorothee; Robert, Marianne; Le Bris, Hervé. |
| Human activities affect continental shelves, especially due to the harvest of living marine resources. Understanding their functioning and dynamics has become a growing concern in recent decades, especially through use of trophic modelling approaches. Studying the feeding ecology of key component species also improves this understanding by providing accurate information on trophic processes, particularly the dependence on trophic pathways. This study focuses on the trophic ecology of four large gadiforms (cod, haddock, whiting and hake) found on the continental shelf of the Celtic Sea. The study combines information on recently ingested prey (gut content analysis) and a more integrated indicator of food sources (stable isotope analysis). Two size classes... |
| Tipo: Text |
Palavras-chave: Celtic Sea; Feeding; Gut content; Stable isotopes; Ontogeny; Habitat comparison. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00486/59742/62839.pdf |
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| Porumb, Loan I.. |
| Feeding of the S. sprattus was studied comparatively with the dynamics of the zooplanktonic trophic base. In April, the sprat consumed 1,459 t of zooplankton, especially Acartia clausi (84 per cent). Zooplanktonic productivity was 30 per cent due to Acartia clausi, and the sprat consumed 56 per cent of this copepod production. In April, the wt growth of the sprat was 115 t. In May, the sprat consumed 6.201 t of zooplankton, that resulted in a fish production of 492 t. A clausi contributed 36.41 per cent to the zooplankton production and the sprat fed on copepods at a level of 93 per cent. In June, only 1,094 t of zooplankton resulted in a fish production of 87 t. Zooplanktonic production was 60 per cent due to A. clausi, and only 12 per cent of this was... |
| Tipo: Text |
Palavras-chave: Romania; Black Sea; Meroplankton; Copepoda; Zooplankton; Feeding; Sprattus sprattus. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-2164.pdf |
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| Registros recuperados: 233 | |
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