- Bio-economics, biodiversity, sustainability, resilience, fisheries, land-useedit
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The small-scale fisheries sector in many Pacific islands is facing increasing challenges in relation to resource availability, economic opportunity, and demographic and social pressure. In particular, intensifying cash-oriented livelihood... more
The small-scale fisheries sector in many Pacific islands is facing increasing challenges in relation to resource availability, economic opportunity, and demographic and social pressure. In particular, intensifying cash-oriented livelihood strategies can exacerbate existing vulnerabilities and threaten food security and resource conservation. In this paper the authors develop a bio-economic model and a quantitative measure of resilience in order to explore the interaction between socio-economic and ecological dynamics, and to analyze the potential role that cooperation and collective arrangements can play in this interaction to maintain the viability of the system. Based on the case of the system known as wantok typically found in the Solomon Islands, numerical examples are used to explore the potential gain that cooperation between fishers can bring in terms of subsistence, profitability and ecological performances, as well as the resilience of the whole system to shocks
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With the development of the ecosystem approach to fisheries (EAF), fisheries management is increasingly required to deal with multiple, often conflicting objectives. In this context, the stochastic co-viability approach has been proposed... more
With the development of the ecosystem approach to fisheries (EAF), fisheries management is increasingly required to deal with multiple, often conflicting objectives. In this context, the stochastic co-viability approach has been proposed as a useful modeling framework as it allows for the combined representation of complex fisheries dynamics, uncertainty and the need to include multiple dimensions in the evaluation of sustainability. The present paper focuses on the application of this approach to the case of the Northern Prawn Fishery (NPF) in Australia. The fishery is based on several high valued prawn species each with different biology: an uncertain resource, the white banana prawn (Penaeus merguiensis), a more predictable resource comprising two target tiger prawns (Penaeus semisulcatus and P. Esculentus) and the by-product blue Endeavour prawn (Metapenaeus endeavouri). A bio-economic multi-species and multifishing strategies model is developed to examine how the fishery can op...
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Research Interests: Management, Environmental Science, Economics, Climate Change, Ecological Economics, and 15 moreFisheries, Applied Economics, Natural Resource Economics, Global Warming, Temperature, Fishery, Scenarios, Bay of Biscay, Overexploitation, MSY, Sustainability, Bay, ENVIRONMENTAL SCIENCE AND MANAGEMENT, Maximum economic yield, and biscay
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Les modes de gestion des prairies sont reconnus comme les moteurs essentiels de la qualite des habitats et donc du devenir d’un grand nombre d’especes animales et vegetales des agroecosystemes prairiaux europeens. A ce jour, les... more
Les modes de gestion des prairies sont reconnus comme les moteurs essentiels de la qualite des habitats et donc du devenir d’un grand nombre d’especes animales et vegetales des agroecosystemes prairiaux europeens. A ce jour, les recherches ont surtout aborde les impacts a court terme de ces modes de gestion. L’UMR SADAPT propose un modele dynamique predisant les strategies de pâturage qui concilient a long terme production fourragere et conservation de l’avifaune dans les prairies de marais. Ce modele est applique a deux petits echassiers limicoles, le Vanneau Huppe et le Chevalier Gambette, dont les cycles de vie sont lies aux modes de gestion des prairies.
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‘Bet-hedging' behaviour among farmers, who diversify land use to avoid investing in a single land use that might fail, can boost farmland biodiversity, a new study suggests. However, because historical data show this is not the most... more
‘Bet-hedging' behaviour among farmers, who diversify land use to avoid investing in a single land use that might fail, can boost farmland biodiversity, a new study suggests. However, because historical data show this is not the most frequent strategy used by farmers, balancing environmental and economic concerns in agriculture may still require public policy instruments, such as subsidies or taxes.
Research Interests: Business and Biodiversity
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This paper investigates the role played by cooperation for the sustainable harvesting of an ecosystem. To achieve this, a bio-economic model based on a multi-species Gompertz dynamics with interspecific relationships and multi-agent... more
This paper investigates the role played by cooperation for the sustainable harvesting of an ecosystem. To achieve this, a bio-economic model based on a multi-species Gompertz dynamics with interspecific relationships and multi-agent catches is considered. A comparison between the non cooperative and cooperative optimal strategies is carried out. Revisiting the tragedy of open-access and over exploitation issues, it is first proved how harvesting pressure is larger in the non cooperative case for every species. Then it is examined to what extent gains of cooperation can also be derived for the state of the ecosystem. It turns out that cooperation clearly promotes the biodiversity when the number of agents is high. By contrast, when the number of agents remains limited, results are more ambiguous especially if a species by species viewpoint is adopted. However, an indicator is proposed at the ecosystem scale to highlight the gain of cooperation in the general case. Numerical examples illustrate the analytical findings.
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... POLICY OPTIONS JOHN HEATH and HANS BINSWANGER Natural resource degradation effects of poverty and population growth are largely policy-induced: the case of ... ERWIN BULTE and DAAN VAN SOEST International transfers, price uncertainty... more
... POLICY OPTIONS JOHN HEATH and HANS BINSWANGER Natural resource degradation effects of poverty and population growth are largely policy-induced: the case of ... ERWIN BULTE and DAAN VAN SOEST International transfers, price uncertainty and tropical deforestation ...
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Objective Conciliating production and conservation involves trade offs and farming activities may have both positive and negative effects on the life traits of grassland birds. Most grassland birds being precocial species, it has been... more
Objective Conciliating production and conservation involves trade offs and farming activities may have both positive and negative effects on the life traits of grassland birds. Most grassland birds being precocial species, it has been suggested that spatial ...
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L'élaboration d'un calcul différentiel dans l'espace des formes s' avère nécessaire dès lors que l'on souhaite optimiser des formes, contrôler et réguler l'évolution de domaines géométriques dépendant du... more
L'élaboration d'un calcul différentiel dans l'espace des formes s' avère nécessaire dès lors que l'on souhaite optimiser des formes, contrôler et réguler l'évolution de domaines géométriques dépendant du temps. Malgré l'absence de structure linéaire, on peut adapter, à l'espace métrique des formes, des théorèmes tels que ceux de Filippov, des fonctions inverses sous contraintes ou encore la méthode de Lyapunov. Des applications au contrôle visuel en découlent