Luc Doyen - Academia.edu (original) (raw)

Papers by Luc Doyen

Research paper thumbnail of Optimal timing of CO2 mitigation policies for a cost-effectiveness model

Mathematical and Computer Modelling, Sep 1, 2008

This paper deals with the regulation of greenhouse gases emissions related to climate change. We ... more This paper deals with the regulation of greenhouse gases emissions related to climate change. We consider a stylized climate-economy sequential model and use a cost-effectiveness approach. The analytical study is based on dynamic programming method. It provides both a tolerable ceiling of concentration and, under simple conditions involving the marginal abatement cost and emission functions, optimal and effective abatement rates. In particular, we prove how the cost effective abatement rate increases with time. Through the optimal time to act function, we examine in detail the role played by greenhouse gases absorption, growth and discount rates. We also analyze the paths from an intergenerational equity perspective. Numerical examples illustrate the general statements.

Research paper thumbnail of A viability analysis for the management of forest systems

HAL (Le Centre pour la Communication Scientifique Directe), 2001

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Research paper thumbnail of Sustainable coalitions in the commons

HAL (Le Centre pour la Communication Scientifique Directe), 2012

Il est bien connu que l'absence de coopération entre plusieurs agents exploitant une ressource re... more Il est bien connu que l'absence de coopération entre plusieurs agents exploitant une ressource renouvelable en accès libre peut conduire à son extinction. Ce papier se propose d'étudier la relation existante entre le nombre potentiel d'exploitant et l'état du stock lorsque les agents sont hétérogènes en termes de coût et qu'ils peuvent former des coalitions. Un modèle bio-économique est construit combinant une approche de viabilité et la théorie des jeux afin d'analyser l'impact de contraintes bio-

Research paper thumbnail of Stochastic Multi-species MSY to Achieve Ecological-Economic Sustainability of a Coral Reef Fishery System in French Polynesia

Environmental Modeling & Assessment, Jul 28, 2022

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Research paper thumbnail of Recovering viable fisheries

RePEc: Research Papers in Economics, 2006

This paper develops a formal analysis of the recovery processes for a fishery, from undesired to ... more This paper develops a formal analysis of the recovery processes for a fishery, from undesired to desired levels of sustainable exploitation, using the theoretical framework of viability control. We define sustainability in terms of biological, economic and social constraints which need to be met for a viable fishery to exist. Biological constraints are based on the definition of a minimal resource stock to be preserved. Economic constraints relate to the existence of a minimum profit per vessel. Social constraints refer to the maintenance of a minimum size of the fleet, and to the maximum speed at which fleet adjustment can take place. Using fleet size and fishing effort per vessel as control variables, we identify the states of this bioeconomic system for which sustainable exploitation is possible, i.e. for which all constraints are dynamically met. Such favorable states are called viable states. We then examine possible transition phases, from non-viable to viable states. We characterize recovery paths, with respect to the economic and social costs of limiting catches during the recovery period, and to the duration of this transition period. Sensitivity of each of the constraints to transition costs and time are analyzed. The analysis is applied to a single stock fishery; preliminary results of an empirical application to the bay of Biscay nephrops fishery are presented.

Research paper thumbnail of A sustainable management of renewable resource with a quota market

RePEc: Research Papers in Economics, Jul 4, 2006

This paper deals with the sustainable management of a renewable resource based on individual and ... more This paper deals with the sustainable management of a renewable resource based on individual and transferable quotas (ITQs). The aim of that paper is to determine the conditions under which a regulating agency can achieve both ecological and economic objectives when agents are heterogenous and non-compliant. To achieve this, a controlled dynamic bio-economic model is built with catches derived from

Research paper thumbnail of Sustainable management of an exhaustible resource:a viable control model

RePEc: Research Papers in Economics, 2003

We examine sustainability conditions of an economic production-consumption system based on the us... more We examine sustainability conditions of an economic production-consumption system based on the use of an exhaustible natural resource. But instead of studying the environmental and economic interactions in terms of optimal control, we pay much attention to the viability of the system. The ex ante viability, defined by a set of constraints combining a guaranteed consumption and a stock of resource to preserve at any time, refers to a Rawlsian intergenerational equity perspective. Using the mathematical concept of viability kernel dealing with the consistency between the constraints and the controlled dynamics, we reveal the sustainable technological configurations and, whenever possible, policies options and environmental-economic states to guarantee a perennial system. We point out the flexibility in "extractionconsumption" choices. Numerical simulations illustrate the general results.

Research paper thumbnail of The Major Roles of Climate Warming and Ecological Competition in the Small-scale Coastal Fishery in French Guiana

Environmental Modeling & Assessment, May 17, 2021

Marine ecosystems, biodiversity, and fisheries are under strain worldwide due to global changes i... more Marine ecosystems, biodiversity, and fisheries are under strain worldwide due to global changes including climate warming and demographic pressure. To address this issue, many scientists and stakeholders advocate the use of an ecosystem approach for fisheries that integrates the numerous ecological and economic complexities at play rather than focusing on the management of individual target species. However, the operationalization of such an ecosystem approach remains challenging, especially from a bio-economic standpoint. Here, to address this issue, we propose a model of intermediate complexity (MICE) relying on multi-species, multi-fleet, and resourcebased dynamics. Climate change effects are incorporated through an envelope model for the biological growth of fish species as a function of sea surface temperature. The model is calibrated for the small-scale fishery in French Guiana using a time series of fish landings and fishing effort from 2006 to 2018. From the calibrated model, a predictive fishing effort projection and RCP climate scenarios derived from IPCC, we explore the ecosystem dynamics and the fishery production at the horizon 2100. Our results demonstrate the long-term detrimental impact of both climate change and ecological competition on fish biodiversity. The prognosis is particularly catastrophic under the most pessimistic climate scenario, with a potential collapse of both biomass targeted species and fishing activity by 2100.

Research paper thumbnail of EcoViability for fisheries management in French Guiana

HAL (Le Centre pour la Communication Scientifique Directe), 2015

Research paper thumbnail of Cheptel multi-espèces lamas-ovins et contrôle de la reproduction : une analyse de viabilité

HAL (Le Centre pour la Communication Scientifique Directe), Aug 31, 2000

Research paper thumbnail of Bio-economic scenarios for marine biodiversity and fisheries

HAL (Le Centre pour la Communication Scientifique Directe), 2015

Research paper thumbnail of Ecological Economic Viability for fisheries

HAL (Le Centre pour la Communication Scientifique Directe), 2016

Research paper thumbnail of Scénarios et modélisation écologico-économiques

HAL (Le Centre pour la Communication Scientifique Directe), 2014

Research paper thumbnail of Biodiversité en territoires viticoles

HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2020

Research paper thumbnail of When Profitability Meets Conservation Objectives Through Biodiversity Offsets

Research paper thumbnail of Farmbird - an interdiciplinary modelling project on the coviability of farming systems and bird biodiversity

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Research paper thumbnail of Diversity in Management Regimes : A Major Driver of the Production / Conservation Trade-Offs in Grassland Agroecosystem

Research paper thumbnail of Aci Moorea Méthodes et Outils D'Optimisation Pour La Recherche en Écologie Appliquée

Research paper thumbnail of Etude de faisabilité pour la réalisation d’un Millennium Ecosystem Assessment en France

Research paper thumbnail of From Fork to Fish: The Role of Consumer Preferences on the Sustainability of Fisheries

Social Science Research Network, 2022

The increasing consumption of seafood products raises concerns over the sustainability of marine ... more The increasing consumption of seafood products raises concerns over the sustainability of marine ecosystems. We examine the role of consumer preferences on seafood demand and consequently on the sustainability of fisheries. Our analysis relies on a bio-economic model combining a demand derived from a CES utility depending on different fish species, a mixed fishery supply based on the Schaefer production function, a market equilibrium and a multispecies resource-based dynamics. Using both a steady-state approach and bio-economic viability goals, we identify analytical conditions on consumer preferences making it possible to balance biodiversity conservation with viable profits. We derive policy recommendations in terms of eco-labels for the sustainability of fisheries and the underlying seafood system. We exemplify the analytical results with the coastal fishery in French Guiana.

Research paper thumbnail of Optimal timing of CO2 mitigation policies for a cost-effectiveness model

Mathematical and Computer Modelling, Sep 1, 2008

This paper deals with the regulation of greenhouse gases emissions related to climate change. We ... more This paper deals with the regulation of greenhouse gases emissions related to climate change. We consider a stylized climate-economy sequential model and use a cost-effectiveness approach. The analytical study is based on dynamic programming method. It provides both a tolerable ceiling of concentration and, under simple conditions involving the marginal abatement cost and emission functions, optimal and effective abatement rates. In particular, we prove how the cost effective abatement rate increases with time. Through the optimal time to act function, we examine in detail the role played by greenhouse gases absorption, growth and discount rates. We also analyze the paths from an intergenerational equity perspective. Numerical examples illustrate the general statements.

Research paper thumbnail of A viability analysis for the management of forest systems

HAL (Le Centre pour la Communication Scientifique Directe), 2001

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Research paper thumbnail of Sustainable coalitions in the commons

HAL (Le Centre pour la Communication Scientifique Directe), 2012

Il est bien connu que l'absence de coopération entre plusieurs agents exploitant une ressource re... more Il est bien connu que l'absence de coopération entre plusieurs agents exploitant une ressource renouvelable en accès libre peut conduire à son extinction. Ce papier se propose d'étudier la relation existante entre le nombre potentiel d'exploitant et l'état du stock lorsque les agents sont hétérogènes en termes de coût et qu'ils peuvent former des coalitions. Un modèle bio-économique est construit combinant une approche de viabilité et la théorie des jeux afin d'analyser l'impact de contraintes bio-

Research paper thumbnail of Stochastic Multi-species MSY to Achieve Ecological-Economic Sustainability of a Coral Reef Fishery System in French Polynesia

Environmental Modeling & Assessment, Jul 28, 2022

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Research paper thumbnail of Recovering viable fisheries

RePEc: Research Papers in Economics, 2006

This paper develops a formal analysis of the recovery processes for a fishery, from undesired to ... more This paper develops a formal analysis of the recovery processes for a fishery, from undesired to desired levels of sustainable exploitation, using the theoretical framework of viability control. We define sustainability in terms of biological, economic and social constraints which need to be met for a viable fishery to exist. Biological constraints are based on the definition of a minimal resource stock to be preserved. Economic constraints relate to the existence of a minimum profit per vessel. Social constraints refer to the maintenance of a minimum size of the fleet, and to the maximum speed at which fleet adjustment can take place. Using fleet size and fishing effort per vessel as control variables, we identify the states of this bioeconomic system for which sustainable exploitation is possible, i.e. for which all constraints are dynamically met. Such favorable states are called viable states. We then examine possible transition phases, from non-viable to viable states. We characterize recovery paths, with respect to the economic and social costs of limiting catches during the recovery period, and to the duration of this transition period. Sensitivity of each of the constraints to transition costs and time are analyzed. The analysis is applied to a single stock fishery; preliminary results of an empirical application to the bay of Biscay nephrops fishery are presented.

Research paper thumbnail of A sustainable management of renewable resource with a quota market

RePEc: Research Papers in Economics, Jul 4, 2006

This paper deals with the sustainable management of a renewable resource based on individual and ... more This paper deals with the sustainable management of a renewable resource based on individual and transferable quotas (ITQs). The aim of that paper is to determine the conditions under which a regulating agency can achieve both ecological and economic objectives when agents are heterogenous and non-compliant. To achieve this, a controlled dynamic bio-economic model is built with catches derived from

Research paper thumbnail of Sustainable management of an exhaustible resource:a viable control model

RePEc: Research Papers in Economics, 2003

We examine sustainability conditions of an economic production-consumption system based on the us... more We examine sustainability conditions of an economic production-consumption system based on the use of an exhaustible natural resource. But instead of studying the environmental and economic interactions in terms of optimal control, we pay much attention to the viability of the system. The ex ante viability, defined by a set of constraints combining a guaranteed consumption and a stock of resource to preserve at any time, refers to a Rawlsian intergenerational equity perspective. Using the mathematical concept of viability kernel dealing with the consistency between the constraints and the controlled dynamics, we reveal the sustainable technological configurations and, whenever possible, policies options and environmental-economic states to guarantee a perennial system. We point out the flexibility in "extractionconsumption" choices. Numerical simulations illustrate the general results.

Research paper thumbnail of The Major Roles of Climate Warming and Ecological Competition in the Small-scale Coastal Fishery in French Guiana

Environmental Modeling & Assessment, May 17, 2021

Marine ecosystems, biodiversity, and fisheries are under strain worldwide due to global changes i... more Marine ecosystems, biodiversity, and fisheries are under strain worldwide due to global changes including climate warming and demographic pressure. To address this issue, many scientists and stakeholders advocate the use of an ecosystem approach for fisheries that integrates the numerous ecological and economic complexities at play rather than focusing on the management of individual target species. However, the operationalization of such an ecosystem approach remains challenging, especially from a bio-economic standpoint. Here, to address this issue, we propose a model of intermediate complexity (MICE) relying on multi-species, multi-fleet, and resourcebased dynamics. Climate change effects are incorporated through an envelope model for the biological growth of fish species as a function of sea surface temperature. The model is calibrated for the small-scale fishery in French Guiana using a time series of fish landings and fishing effort from 2006 to 2018. From the calibrated model, a predictive fishing effort projection and RCP climate scenarios derived from IPCC, we explore the ecosystem dynamics and the fishery production at the horizon 2100. Our results demonstrate the long-term detrimental impact of both climate change and ecological competition on fish biodiversity. The prognosis is particularly catastrophic under the most pessimistic climate scenario, with a potential collapse of both biomass targeted species and fishing activity by 2100.

Research paper thumbnail of EcoViability for fisheries management in French Guiana

HAL (Le Centre pour la Communication Scientifique Directe), 2015

Research paper thumbnail of Cheptel multi-espèces lamas-ovins et contrôle de la reproduction : une analyse de viabilité

HAL (Le Centre pour la Communication Scientifique Directe), Aug 31, 2000

Research paper thumbnail of Bio-economic scenarios for marine biodiversity and fisheries

HAL (Le Centre pour la Communication Scientifique Directe), 2015

Research paper thumbnail of Ecological Economic Viability for fisheries

HAL (Le Centre pour la Communication Scientifique Directe), 2016

Research paper thumbnail of Scénarios et modélisation écologico-économiques

HAL (Le Centre pour la Communication Scientifique Directe), 2014

Research paper thumbnail of Biodiversité en territoires viticoles

HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2020

Research paper thumbnail of When Profitability Meets Conservation Objectives Through Biodiversity Offsets

Research paper thumbnail of Farmbird - an interdiciplinary modelling project on the coviability of farming systems and bird biodiversity

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Research paper thumbnail of Diversity in Management Regimes : A Major Driver of the Production / Conservation Trade-Offs in Grassland Agroecosystem

Research paper thumbnail of Aci Moorea Méthodes et Outils D'Optimisation Pour La Recherche en Écologie Appliquée

Research paper thumbnail of Etude de faisabilité pour la réalisation d’un Millennium Ecosystem Assessment en France

Research paper thumbnail of From Fork to Fish: The Role of Consumer Preferences on the Sustainability of Fisheries

Social Science Research Network, 2022

The increasing consumption of seafood products raises concerns over the sustainability of marine ... more The increasing consumption of seafood products raises concerns over the sustainability of marine ecosystems. We examine the role of consumer preferences on seafood demand and consequently on the sustainability of fisheries. Our analysis relies on a bio-economic model combining a demand derived from a CES utility depending on different fish species, a mixed fishery supply based on the Schaefer production function, a market equilibrium and a multispecies resource-based dynamics. Using both a steady-state approach and bio-economic viability goals, we identify analytical conditions on consumer preferences making it possible to balance biodiversity conservation with viable profits. We derive policy recommendations in terms of eco-labels for the sustainability of fisheries and the underlying seafood system. We exemplify the analytical results with the coastal fishery in French Guiana.