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	Provedor de dados ArchiMer (3) AgEcon (1) PAB (1) Autor Macher, Claire (3) Bertignac, Michel (2) Guyader, Olivier (2) Bittencourt,Thereza Cristina Calmon de (1) Boncoeur, Jean (1) Bourgeois, Cyril (1) Carvalho,Caio Victor Damasceno (1) Clodic, Melissa (1) Doyen, Luc (1) Fifas, Spyros (1) Fradj, Nosra Ben (1) Gourguet, Sophie (1) Guillen, Jordi (1) Jayet, Pierre-Alain (1) Merzereaud, Mathieu (1) Thebaud, Olivier (1) Mais... Palavra-chave Bio-economic model (5) Bay of Biscay (2) Fisheries (2) Beef cattle (1) Bio-energy support (1) Co-viability (1) Economic value (1) Effort (1) Environmental Economics and Policy (1) Environmental policy mix (1) Fuel costs (1) MEY (1) MSY (1) Management tradeoff (1) Market fluctuation (1) Mathematical linear programming (1) Multi-fleet (1) Multi-species (1) N-fertilizer tax (1) Nephrops fishery (1) Mais... Tipo do documento Text (3) Conference Paper or Presentation (1) Info:eu-repo/semantics/article (1) Ano 2015 (1) 2013 (2) 2011 (1) 2010 (1) País France (3) Brazil (1) United States (1) Idioma Inglês (5)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Managing mixed fisheries for bio-economic viability ArchiMer Gourguet, Sophie; Macher, Claire; Doyen, Luc; Thebaud, Olivier; Bertignac, Michel; Guyader, Olivier. Management of fisheries for sustainability requires dealing with multiple and often conflicting objectives. A stochastic viability approach is proposed to address the trade-offs associated with balancing ecological, economic and social objectives in regulating mixed fisheries, taking into account the complexity and uncertainty of the dynamic interactions which characterize such fisheries. We focus on the demersal fishery in the Bay of Biscay and more specifically on the fleets harvesting Norway Lobster (Nephrops norvegicus), Hake (Merluccius merluccius) and Sole (Solea solea). A bio-economic multi-species and multi-fleet model with technical interactions is developed to examine the trade-offs between preserving Spawning Stock Biomass (SSB) of every species... Tipo: Text Palavras-chave: Bay of Biscay; Bio-economic model; Co-viability; Fisheries; Uncertainty. Ano: 2013 URL: http://archimer.ifremer.fr/doc/00129/23999/22052.pdf Optimal Selectivity and Effort Cost A Simple Bioeconomic Model with an Application to the Bay of Biscay Nephrops Fishery ArchiMer Macher, Claire; Boncoeur, Jean. This article investigates the relationship between optimal gear selectivity and effort cost in the fishing industry We first show that optimal selectivity depends negatively on the level of effort cost, but that this relationship is not continuous. Optimal selectivity switches when real effort cost goes beyond a certain level, and this switch induces a non-marginal reduction in the level of fishing effort. In the second part of this article, we shoot, that the current level of real effort cost in the Nephrops fishery of the Bay of Biscay is far below the switch point, which makes high selectivity optimal. The discrepancy between optimal and current selectivity may be explained by the state of the fishery management and also by the fact that selectivity is... Tipo: Text Palavras-chave: Selectivity; Effort; Technical measure; Management tradeoff; Nephrops fishery; Bay of Biscay; Bio-economic model; Social and private benefits and costs; Fuel costs. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12232/9279.pdf Estimating MSY and MEY in multi-species and multi-fleet fisheries, consequences and limits: an application to the Bay of Biscay mixed fishery ArchiMer Guillen, Jordi; Macher, Claire; Merzereaud, Mathieu; Bertignac, Michel; Fifas, Spyros; Guyader, Olivier. Most worldwide fish stocks are overexploited, and so exploited beyond the Maximum Sustainable Yield (MSY) and the Maximum Economic Yield (MEY). Not exploiting fisheries resources at MSY or MEY leads to the loss of production and rents from the fisheries. A large part of the EU fisheries are managed based on single species stock assessments; however, in reality, most species are caught together with other species and by different fleets. In multi-species and multi-fleet fisheries, single species assessments, and consequently MSY and MEY reference points, are often not valid, and so the catch recommendations. In this paper it is investigated the MSY and MEY estimation in multi-species and multi-fleet fisheries in comparison to single species assessments.... Tipo: Text Palavras-chave: MSY; MEY; Multi-species; Multi-fleet; Fisheries; Bio-economic model. Ano: 2013 URL: http://archimer.ifremer.fr/doc/00129/24000/22053.pdf Breeding objectives for a Nellore cattle rearing system PAB Carvalho,Caio Victor Damasceno; Bittencourt,Thereza Cristina Calmon de. Abstract:The objective of this work was to define the traits that should be included as breeding objectives for Nellore cattle, according to simulations with a bio-economic model for rearing systems. The economic values (EVs) of the traits were calculated as the differences between the profits due to an increased performance of 1% in each trait, with the others traits remaining constant. To determine the impact of each selection on the revenue system, two scenarios were simulated based on the traits being selected. In the first scenario, the adopted selection criteria were: weaning weight (WW), weaning rate (WR), yearling weight (YW), and mature cow weight (MCW). In the second scenario, the cumulative productivity (CP) of dams was used as an indirect... Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef cattle; Bio-economic model; Economic value; Market fluctuation; Selection criteria.. Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000900814 Limiting the Nitrogen Losses by N-tax and Bioenergy Support: A Quantitative Analysis of Environmental Policy Mix Impacts in the North of France AgEcon Fradj, Nosra Ben; Bourgeois, Cyril; Clodic, Melissa; Jayet, Pierre-Alain. This paper is devoted to assessment of policy mix impacts regarding nitrogen pollutants. The analysed policy combines a tax on the nitrogen input and incentives promoting perennial crops assumed to be low input ones. We show that perennial crop subsidy increases significantly the tax efficiency, compatible with the balanced budget of the Regulatory Agency in charge of the environment. Based on a MILP agricultural supply model, quantitative analysis provides assessment of impacts regarding land use, farmers income, and N losses at the North France level. Tipo: Conference Paper or Presentation Palavras-chave: Bio-economic model; Mathematical linear programming; Environmental policy mix; N-fertilizer tax; Bio-energy support; Environmental Economics and Policy. Ano: 2011 URL: http://purl.umn.edu/114267 Registros recuperados: 5 Primeira ... 1 ... Última

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