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| Registros recuperados: 61 | |
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| Blanchard, Fabian. |
| "L'analyse des stratégies démographiques adoptées, défuùes par Barbault, (1981) comme des adaptations face aux pressions sélectives de l'environnement, devrait permettre de mieux analyser la capacité de réaction des stocks aux contraintes extérieures. Pouvoir déceler ainsi une éventuelle interaction entre sélection naturelle et anthropique (action de la pêche), est un intérêt dans l'aménagement des pêcheries. Barbault schématise les stratégies, d'un point de vue énergétique, comme étant la résultante du partage optimal des ressources entre la maintenance, la croissance et la reproduction. ll considère que la plasticité et/ou le polymorphisme démographique représente une valeur adaptative, dans un environnement hétérogène et changeant, vraisemblablement... |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00444/55519/57104.pdf |
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| Doyen, Luc; Thebaud, Olivier; Bene, Christopher; Martinet, V.; Gourguet, S.; Bertignac, Michel; Fifas, Spyros; Blanchard, Fabian. |
| Academia and management agencies show a growing interest for ecosystem-based fishery management (EBFM). However, the way to operationalize this approach remains challenging. The present paper illustrates how the concepts of stochastic co-viability, which accounts for dynamic complexities, uncertainties, risk and sustainability constraints, can be useful for the implementation of EBFM. In the present case, this concept is used to identify fishing strategies that satisfy both ecological conservation and economic sustainability in a multi-species, multi-fleet context. Economic Viability Analysis (EVA) and the broader Co-Viability Analysis (CVA), are proposed to expand the usual Population Viability Analysis (PVA) and precautionary approach. An illustration is... |
| Tipo: Text |
Palavras-chave: Ecosystem based fisheries management; Viability; Stochastic; Nephrops; Hake. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00074/18571/16153.pdf |
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| Guyader, Olivier; Reynal, Lionel; Lespagnol, Patrick; Le Meur, Chloe; Demaneche, Sebastien; Le Blond, Samuel; Jean-charles, Cedric; Erialc, Carole; Rulle, Ludovic; Bourgeois, Pierre; Cornou, Anne-sophie; Leblond, Emilie; Merrien, Claude; Le Ru, Loic; Blanchard, Fabian; Daures, Fabienne; Berthou, Patrick. |
| Le présent document est une restitution globale des données disponibles au sein du SIH sur les navires de pêche français, et en particulier : • le fichier « Flotte de Pêche Communautaire » (FPC), qui référence l'ensemble des navires de pêche professionnelle de la flotte française et leurs caractéristiques techniques (source : DPMA) ; • les données du flux déclaratif, c'est-à-dire les déclarations de captures et d'effort de pêche des pêcheurs professionnels, issues des journaux de bord pour les navires de 10 mètres et plus et des fiches de pêche pour les navires de moins de 10 mètres (source : DPMA) ; • les données de ventes (essentiellement des ventes en criée) des navires de pêche professionnelle (source : DPMA) ; • les données d'enquêtes « Activité »... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00180/29121/27527.pdf |
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| Magraoui, Amira; Baulier, Loïc; Blanchard, Fabian. |
| The shrimp fishery (Farfantepenaeus subtilis and F. brasiliensis) was the first fishery in value in French Guiana during the 1990s. However, two successive drops in recruitment in 1999 and 2006 led to decreases in stock and hence landings of shrimp. Recruitment levels are today at their lowest. Prior analyses suggest a minor influence of harvesting and fish predation on the failure in stock rebuilding. Environment instead appears to play a pivotal role here. In a region where few oceanographic surveys have been carried out, remote sensing has proven a powerful tool to track variations in the environment. Series of water temperature, turbidity, suspended matters and chlorophyll a concentrations were analysed and compared to the series of shrimp recruitment... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00283/39398/37843.pdf |
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| Chambault, Philippine; Giraudou, Lucie; De Thoisy, Benoit; Bonola, Marc; Kelle, Laurent; Dos Reis, Virginie; Blanchard, Fabian; Le Maho, Yvon; Chevallier, Damien. |
| The identification of the inter-nesting habitat used by gravid sea turtles has become a crucial factor in their protection. Their aggregation in large groups of individuals during the inter-nesting period exposes them to increased threats to their survival - particularly along the French Guiana shield, where intense legal and illegal fisheries occur. Among the three sea turtle species nesting in French Guiana, the olive ridley appears to have the most generalist diet, showing strong behavioural plasticity according to the environment encountered. The large amounts of sediments that are continuously discharged by the Amazon River create a very unusual habitat for olive ridleys, i.e. turbid waters with low salinity. This study assesses the behavioural... |
| Tipo: Text |
Palavras-chave: Lepidochelys olivacea; Equatorial Atlantic; Inter-nesting season; Behavioural synchrony; Amazon River. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00354/46507/46269.pdf |
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| Baulier, Loic; Blanchard, Fabian. |
| L’existence d’un impact de la prospection sismique pétrolière sur les rendements journaliers des pêcheurs Vénézuéliens ciblant le vivaneau rouge (Lutjanus purpureus) au large de la Guyane au cours de la période 2002–2012 a été évaluée au cours de cette étude. Les informations recueillies dans les fiches de pêche ont permis de tenir compte de facteurs tels que l’effort de pêche, le secteur et la période de pêche ainsi que la profondeur prospectée. Une fois ces différentes influences prises en considération, l’effet de la co-occurrence d’une campagne de prospection a été testé. Les analyses ont révélé des effets des campagnes de prospection positifs ou négatifs mais non significatifs statistiquement à deux exceptions près avec. Les deux seuls résultats... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00176/28710/27162.pdf |
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| Blanchard, Fabian; Thebaud, Olivier; Guyader, Olivier; Lorance, Pascal; Boucher, Jean; Chevaillier, Pierre. |
| The populations of fishes dwelling near the sea bed (demersal species) on the continental shelf are usually the object of intense commercial exploitation. The Bay of Biscay shelf is no exception. Hence, populations suffer from this exploitation. Moreover, the general role played by hydro-climatic variations in the regulation of the abundance of demersal fish populations (population dynamics) is traditionally admitted. In the Bay of Biscay, a warming of the surface water has been observed over the three last decades (Koutsikopoulos et al., 1998). Climate change therefore has potential consequences on fish communities. Thus, the structure and dynamics of fish populations on the continental shelf of the Bay of Biscay are susceptible to suffer both from the... |
| Tipo: Text |
Palavras-chave: Modèles individus centrés; Conséquences économiques; Réchauffement climatique; Impact de la pêche; Communautés de poissons. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-6347.pdf |
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| Rousseau, Yann; Blanchard, Fabian; Gardel, Antoine. |
| The present study focuses on the structure and dynamics of the ichthyoplankton community of the Mahury Estuary (French Guiana) and the factors that influence them. Data were collected on three mangrove sites located in the inner, middle, and outer areas of the estuary. More than 45 000 larvae were collected, representing 31 families and 67 taxa. The community was numerically dominated by few species: Engraulidae was the most abundant family, followed by Gobiidae, Eleotridae, and Sciaenidae. As expected, the most abundant larval taxa were estuarine and mangrove species, with the addition of freshwater species in the inner area of the estuary and taxa with marine affinities in the outer area. The densities of most species were influenced by site more than by... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00384/49559/50342.pdf |
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| Martinet, Vincent; Blanchard, Fabian. |
| Sustainable management of natural resources, and in particular fisheries, must take into account several conflicting objectives. This is the case in the French Guiana shrimp fishery for which profitability objectives imply a reduction in the fishing activity. On the one hand, this fishery has negative externalities on marine biodiversity due to discards. On the other hand, this fishery has positive externalities on the economy of the local community and interestingly enough on a protected seabird species in the area (the Frigatebird that feeds on discards). In this paper, we examine the viability of that system considering two sustainability objectives: an economic objective in terms of the profitability of the fishing activity, and a conservation... |
| Tipo: Text |
Palavras-chave: Bio-economic modeling; Viability; Sustainability; Fishery externalities; Species conservation. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00020/13135/10195.pdf |
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| De Thoisy, Benoit; Lavergne, Anne; Semelin, Julien; Pouliquen, Jean-francois; Blanchard, Fabian; Hansen, Eric; Lacoste, Vincent. |
| The Ile du Grand Connetable nature reserve is a rocky island off the Northern Atlantic coast of South America that hosts a unique population of Magnificent Frigatebirds (Fregata, magnificens, Pelecaniformes). A high chick mortality, associated with nodular proliferative lesions, involving featherless areas, such as legs, neck, eyelids, and beak, was recorded during a consecutive 2 yr and affected almost half of the generation. Investigations were therefore, conducted to determine the cause of these epidemics. Although histopathologic investigations suggested that malnutrition, because of fewer resources in the Frigates' fishing area, could be the cause of the epidemic, it novel alphaherpesvirus, tentatively called Fregata magnificens herpesvirus, was... |
| Tipo: Text |
Palavras-chave: Frigatebird; Fregata magnificens; Chick mortality; Alphaherpesvirus. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6811.pdf |
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| Cisse, Abdoul; Doyen, L.; Blanchard, Fabian; Bene, Christophe; Pereau, J. -c.. |
| This paper applies a stochastic viability approach to a tropical small-scale fishery, offering a theoretical and empirical example of ecosystem-based fishery management approach that accounts for food security. The model integrates multi-species, multi-fleet and uncertainty as well as profitability, food production, and demographic growth. It is calibrated over the period 2006–2010 using monthly catch and effort data from the French Guiana's coastal fishery, involving thirteen species and four fleets. Using projections at the horizon 2040, different management strategies and scenarios are compared from a viability viewpoint, thus accounting for biodiversity preservation, fleet profitability and food security. The analysis shows that under certain... |
| Tipo: Text |
Palavras-chave: Small-scale fishery; Biodiversity; Sustainability; Profitability; Food security; Multi-species; Multi-fleet; Stochasticity; Viability; Scenario. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00276/38732/37310.pdf |
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| Le Joncour, Anna; Blanchard, Fabian; Tagliarolo, Morgana. |
| Estuarine and coastal areas are often considered as hotspots due to their high diversity and ecological importance. However, communities living on those areas are often submitted to fishery and climate change pressures causing modifications on fish assemblages. French Guiana’s coastal shelf is characterised by warm waters with high turbidity and low salinity caused by the large river discharges from the Amazon and nearby estuaries. The high productivity of these areas supports fisheries and aquaculture activities. However, the structure and dynamics of coastal fish populations in French Guiana have seldom been studied. The aim of this study was to understand the effect of environmental conditions, as well as the influence of the coast and nearby estuaries... |
| Tipo: Text |
Palavras-chave: French Guiana; Coastal community; Estuary; Diversity; Tropical waters; Fisheries management. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00607/71929/73534.pdf |
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| Registros recuperados: 61 | |
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