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Estimation of technical interactions due to the competition for resource in a mixed-species fishery, and the typology of fleets and metiers in the English Channel ArchiMer
Ulrich, Clara; Gascuel, Didier; Dunn, Matthew R; Le Gallic, Bertrand; Dintheer, Christian.
In a multi-gear and multi-species artisanal fishery, the level of technical interactions (i.e. the competitive externalities resulting from a shared exploitation of common resources or fishing grounds) among various fishing units is high. Assessing these technical interactions is of great importance for fishery management, as any control applied to one fishing unit may have positive or negative effects on others. The magnitude and direction of these effects cannot be easily measured, unless all fishing units and species in the fishery are considered simultaneously. Technical interactions are particularly important in the complex artisanal fisheries of the English Channel. Using a bioeconomic model of the English Channel that incorporates all the major...
Tipo: Text Palavras-chave: Modèle bioéconomique; Compétition; Externalités de stock; Interactions techniques; Typologie; Manche; Bioeconomic model; Competition; Stock externalities; Technical interactions; Typology; English Channel.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/00187/29874/28363.pdf
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Impacts de l’émergence d’un top-prédateur dans un ecosystème exploité : le merlu et le lieu noir de mer du Nord. Quelles interactions ? Quelles conséquences ? ArchiMer
Cormon, Xochitl.
North Sea saithe (Pollachius virens) has high economic value for European fisheries. In recent years, North Sea saithe abundance has decreased, while abundance of hake (Merluccius merluccius), which was rarely fished in the North Sea, has increased dramatically in the area. This work investigates the nature of the ecological interactions between saithe and hake in the North Sea, in order to understand if recent hake emergence in this area could explain, at least partially, the recent decline of the saithe stock. The results obtained during this research suggested competitive interactions between saithe and hake predators in the area. In addition, this investigation revealed potential negative effects of hake on the resident saithe stock. Therefore, hake...
Tipo: Text Palavras-chave: Compétition; Lieu noir; Merlu; Simple réseau trophique; Émergence d’un prédateur; Mer du nord; Exploitative competition; Saithe; Hake; Simple foodweb; Up-coming predator; North sea.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00345/45638/45268.pdf
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Influence du vieillissement d'une population de crépidules sur l'épifaune associée. Influence sur le recrutement ArchiMer
Haubois, Anne-gaëlle.
Crepidula fornicata (slipper Iimpet) is a gastropod mollusc, coming from the North American east coast. Since its accidentaI introduction on french coasts, fifty years ago, C. fomicata invaded several coastal areas of this country and the bay of Saint Brieuc (Brittany -France) is one of the major site affected by the proliferation. Accumulation of dense mats of the slipper limpet contributes to the modification of the bottom structure and affects the substrate's heterogeneity, allowing the settlement of a diversified vagile and sessile epifauna. In this paper, the effects of the C. fornicata population ageing on epifauna assemblages and recruitment are studied. Quantitative and qualitative analysis of epifauna organisms suggests that, the ageing of the C....
Tipo: Text Palavras-chave: Crepidula fornicata; Vieillissement; Épifaune; Compétition; Baie de Saint-Brieuc; Crepidu/afornicata; Ageing; Epifauna; Competition; Bay of Saint-Brieuc.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00037/14822/12138.pdf
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Modélisation 0D des efflorescences d'Alexandrium en rade de Brest en compétition inter-spécifique ArchiMer
Le Gland, Guillaume.
Since 2010, planktonic algae Alexandrium minutum, cause of the PSP (Paralytic Shellfish Poisoning) syndrome, has been proliferating in early summer in the bay of Daoulas, within the roadstead of Brest. During this internship, a model has been designed in order to derive these blooms from physical parameters (temperature, irradiance, nutrient supply, dilution rate …). In the model, A.minutum competes with 50 other plankton species with randomly attributed optimal temperature and nutrient uptake abilities. It turns out to reproduce well the bloom of 2012, with a correct date of maximum concentration and a relevant order of magnitude. It reproduces the order of magnitude of 2013 concentrations, but the bloom then is too spread in time around the maximum....
Tipo: Text Palavras-chave: Alexandrium minutum; Phytoplancton; Efflorescence (bloom); Nutriments; Lumière; Température; Dilution; Absorption (uptake); Quota cellulaire; Croissance; Compétition; Modèle; Rade de Brest.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00209/32004/30442.pdf
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Utilisation d'un marqueur microsatellite pour l'étude des contributions parentales chez l'huître creuse Crassostrea gigas ArchiMer
Hervouet, Veronique.
Les marqueurs génétiques très polymorphes sont des outils particulièrement intéressants pour l'analyse de contributions parentales. Dans notre étude, nous avons utilisé un marqueur microsatellite pour analyser les contributions parentales dans deux croisements contrôlés chez l'huître creuse Crassostrea gigas. 5 mâles et 5 femelles, hétérozygotes à ce locus, et portant chacun des allèles différents (soit 20 allèles ségrégés au total) ont été croisés de deux manières différents: soit en mélangeant toutes les gamètes mâles d'une part, toutes les gamètes femelles d'autre part, et en réalisant un croisement entre ces deux mélanges; soit en fécondant séparément chacune des 5 femelles par chacun de 5 mâles, soit 25 croisement séparés. Pour le deuxième type de...
Tipo: Text Palavras-chave: Contributions parentales; Compétition; Microsatellite; Crassostrea gigas.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00032/14372/11661.pdf
Registros recuperados: 5
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