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| Diop, Bassirou; Blanchard, Fabian; Sanz, Nicolas. |
| This paper deals with the biological, ecological and economic impact of global warming and mangrove habitat availability on the French Guiana shrimp fishery. A dynamic bio-economic model is built by employing a shrimp stock's growth function depending on Sea Surface Temperature (SST) and on mangrove surface. The model is empirically calibrated for the French Guiana shrimp fishery using time series collected over 1995–2011. First, two Cobb-Douglas functions, which describe shrimp's natural growth and harvest, are estimated. Then, a Maximum Economic Yield (MEY) harvest rule, based on the optimization of the net present value derived from fishing, is computed. Three management strategies are compared (Closure, Status Quo management, and MEY) under three... |
| Tipo: Text |
Palavras-chave: Renewable resources; Fishery bio-economic model; Global warming; Shrimp; Sea surface temperature; Mangrove. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00455/56672/58537.pdf |
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| Doyen, Luc; Bene, Christophe; Bertignac, Michel; Blanchard, Fabian; Cisse, Abdoul; Dichmont, Catherine; Gourguet, Sophie; Guyader, Olivier; Hardy, Pierre-yves; Jennings, Sarah; Little, Lorne Richard; Macher, Claire; Mills, David Jonathan; Noussair, Ahmed; Pascoe, Sean; Pereau, Jean-christophe; Sanz, Nicolas; Schwarz, Anne-maree; Smith, Tony; Thebaud, Olivier. |
| Reconciling food security, economic development and biodiversity conservation is a key challenge, especially in the face of the demographic transition characterizing many countries in the world. Fisheries and marine ecosystems constitute a difficult application of this bio-economic challenge. Many experts and scientists advocate an ecosystem approach to manage marine socio-ecosystems for their sustainability and resilience. However, the ways by which to operationalize ecosystem-based fisheries management (EBFM) remain poorly specified. We propose a specific methodological framework-viability modelling-to do so. We show how viability modelling can be applied using four contrasted case-studies: two small-scale fisheries in South America and Pacific and two... |
| Tipo: Text |
Palavras-chave: Biodiversity; Ecological economics; Ecosystem approach; Fisheries; Scenario; Viability. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00409/52009/52724.pdf |
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| Sanz, Nicolas; Diop, Bassirou; Blanchard, Fabian; Lampert, Luis. |
| The purpose of this paper is to investigate the environmental nature of the French Guiana shrimp fishery dynamics through an empirical analysis. To do so, we specify a global harvest production function, in which the output depends on the number of days at sea and the stock level. In addition, we use some environmental variables representing the ‘El Niño’ and ‘la Niña’ phenomena, the sea surface temperature, and the flow of some Amazonian rivers as instruments. This method enables us to correct the well-known simultaneous bias between the harvest and the stock levels and to show that harvest is significantly dependent on the environmental factors analyzed, which may compromise the future of the French Guiana shrimp fishery in the context of climate change. |
| Tipo: Text |
Palavras-chave: Fisheries; Harvest production function; El Ni(n)over-tildeo; La Ni(n)over-tildea; Amazonian rivers. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00334/44486/44200.pdf |
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| Gomes, Helene; Kersulec, Coralie; Doyen, Luc; Blanchard, Fabian; Cisse, Abdoul; Sanz, Nicolas. |
| Marine ecosystems, biodiversity and fisheries are under pressure worldwide because of global changes including climate warming and demographic pressure. In that regard, many scientists and stakeholders advocate the use of an ecosystem approach for fisheries integrating the numerous ecological and economic complexities at play, instead of focusing on the management of isolated target species. However, the way to operationalize such an ecosystem approach remains challenging, especially from the bioeconomic viewpoint. To achieve this, here we propose a model of intermediate complexity (MICE) relying on multi-species and multi-fleets dynamics. The model also takes into account climate change through a model of envelope for the biological growth of the fish... |
| Tipo: Text |
Palavras-chave: Marine biodiversity; Multi-species; Multi-fleet fishery; Models of Intermediate Complexity (MICE); Climate change; Exclusion principle. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00640/75222/75364.pdf |
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| Diop, Bassirou; Sanz, Nicolas; Junior Duplan, Yves Jamont; Guene, El Hadji Mama; Blanchard, Fabian; Pereau, Jean-christophe; Doyen, Luc. |
| This paper deals with fishery management in the face of the ecological and economic effects of global warming. To achieve this, a dynamic bioeconomic model and model-based scenarios are considered, in which the stock's growth function depends on the sea surface temperature. The model is empirically calibrated for the French Guiana shrimp fishery using time series collected over the period 1993–2009. Three fishing effort strategies are then compared under two contrasted IPCC climate scenarios (RCP 8.5 and RCP 2.6). A first harvesting strategy maintains the Status Quo in terms of fishing effort. A more ecologically-oriented strategy based on the closure of the fishery is also considered. A third strategy, which relates to Maximum Economic Yield (MEY), is... |
| Tipo: Text |
Palavras-chave: Renewable resources; Fishery bioeconomic model; Climate change; Climate scenarios; Adaptation; Shrimp. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00453/56418/58115.pdf |
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| Diop, Bassirou; Sanz, Nicolas; Blanchard, Fabian; Walcker, Romain; Gardel, Antoine. |
| This paper investigates the role of mangrove as an habitat in the evolution of the French Guiana shrimp stock to explain the recent collapse of shrimp production. To achieve our aim, we use the open access fishery model developed by Barbier and Strand [1998. “Valuing Mangrove-Fishery Linkages-A Case Study of Campeche, Mexico.” Environmental and Resource Economics 12: 151–166] and integrate mangrove surface into the shrimp natural growth function. This enables to account directly for the effects of mangrove surface changes on the stock dynamics and thus production. Our results indicate that financial losses in the French Guiana shrimp fishery increase when mangrove surface decreases and are mitigated when mangrove surface increases. We show that changes in... |
| Tipo: Text |
Palavras-chave: Shrimp fishery; Mangrove; Habitat; Production function; Open access. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00458/56936/59376.pdf |
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