Éditeur(s) : HAL CCSD
Résumé : This paper studies the biological and economic effects of globalwarming on the French Guiana shrimp …fishery. The sea surface tem-perature is explicitly introduced into four natural growth functions,among which the Cobb-Douglas function best adjusts the availabledata. Besides, a Cobb-Douglas harvest function is also estimated, in-dicating that shrimp production in French Guiana is highly sensitive tothe shrimp stock, which implies that global warming may have strongeconomic implications. We …nally consider a centralized resource man-agement of the French Guiana shrimp …shery, that is undertaken invarious trend scenarios concerning the sea surface temperature. Un-der the most plausible scenario, in which the sea surface temperaturefollows the trend of the last decades, pro…ts and biomass respectivelydecrease and collapse around the end of the 2020’s.
https://hal.univ-antilles.fr/hal-01243305

hal-01243305
https://hal.univ-antilles.fr/hal-01243305
https://hal.univ-antilles.fr/hal-01243305/document
https://hal.univ-antilles.fr/hal-01243305/file/Diop%20et%20al.%20%282015%29.pdf

Éditeur(s) : HAL CCSD
Résumé : The mangroves play a vital role in the ecological balance. They provide marine ecosystem resources and are involved in its stabilization and in the coastal protection. They constitute the growth areas of many species that feed marine species and particularly shrimp. We develop a standard fishery model by integrating mangroves area into the analysis. The extended model shows that mangrove plays animportant role in shrimp production and data related to it are well supported by the model. We analyze the e¤ects of mangrove on open access of the French Guiana shrimp fishery and show that mangrove is not the only factor that plays a vital role in the French Guiana shrimp fishery.
https://hal.univ-antilles.fr/hal-01383024

hal-01383024
https://hal.univ-antilles.fr/hal-01383024
https://hal.univ-antilles.fr/hal-01383024v2/document
https://hal.univ-antilles.fr/hal-01383024/file/Diop%20et%20al.%20%282016%29.pdf

Éditeur(s) : HAL CCSD
Résumé : This paper studies the implications of fi…sh search activities on the working of …fisheries. We develop a simple …shery matching modelin which …rms’ stochastic search for …sh requires speci…fic resources.The equilibrium level of anthropic pressure (number of empty ves-sels/conserved …sh stock) exerted by …rms on the …sh stock is derivedfrom their individual pro…t maximizing behavior. Anthropic pressuredetermines in turn the rate at which vessels fi…nd fi…sh i.e. catchability,which is therefore endogenous in our model, and the stock conserva-tion (uncaught …sh) rate, through the dynamic equation of the latter.We then show that under open access, equilibrium anthropic pressure,…fishing effort and the conservation rate heavily depend on search costs.An empirical study of the French Guiana shrimp …shery con…rms theability of the model to reproduce empirical data.
https://hal.univ-antilles.fr/hal-01228851

Droits : info:eu-repo/semantics/OpenAccess
hal-01228851
https://hal.univ-antilles.fr/hal-01228851
https://hal.univ-antilles.fr/hal-01228851/document
https://hal.univ-antilles.fr/hal-01228851/file/Nicolas%20Sanz%20%26Bassirou%20Diop.pdf

Éditeur(s) : HAL CCSD Elsevier
Résumé : This paper analyzes the effects of pollution permit markets on equilibrium employment in a wage-setting/ price-setting (WS-PS) model. The employment level is determined according to different methods of financing unemployment benefits: a wage tax or the revenue from a pollution permit auction. We show that a permit market weakens the trade unions' market power. Furthermore, whatever the method of financing unemployment benefits, the choice of the pollution cap is always neutral for employment, and the level of employment always increases as the pollution abatement technology becomes more efficient. Depending on the value of the wage tax, the employment level can be higher or lower when unemployment benefits are financed by pollution permits rather than wage tax.
ISSN: 0264-9993

halshs-00866721
https://halshs.archives-ouvertes.fr/halshs-00866721