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Registros recuperados: 17 | |
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Bougaran, Gael; Bernard, Olivier; Sciandra, Antoine. |
It is well documented that the combination of low nitrogen and phosphorus resources can lead to situations where colimitation of phytoplankton growth arises, yet the underlying mechanisms are not fully understood. Here, we propose a Droop-based model built on the idea that colimitation by nitrogen and phosphorus arises from the uptake of nitrogen. Indeed, since N-porters are active systems, they require energy that could be related to the phosphorus status of the cell. Therefore, we assumed that N uptake is enhanced by the P quota. Our model also accounts for the biological observations that uptake of a nutrient can be down-regulated by its own internal quota, and succeeds in describing the strong contrast for the non-limiting quotas under N-limited and... |
Tipo: Text |
Palavras-chave: Colimitation; Phytoplankton; Mathematical model; Quota. |
Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00011/12216/9060.pdf |
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Le Couls, Sarah; Bourjea, Jerome. |
Cette synthèse bibliographique présente les différentes commissions internationales de gestion des grands pélagiques dans les océans Indien, Atlantique et Pacifique, respectivement la CTOI, la CICTA et l'IATTC/WCPFC. De plus, cette synthèse focalise sur le cas de l'espadon Xiphias gladius et détaille pour chaque stock, les captures, l'état du stock ainsi que les mesures de gestion passées et en cours. Le stock de la Méditerranée est l'unique stock en état de surexploitation avéré et fait l'objet de mesures de gestion (interdiction des filets dérivants, fermeture saisonnière de la pêche) mais pas de TAC. Les stocks de l'Atlantique Nord, du Pacifique Sud-est, et de l'Océan Indien sont proches de la pleine exploitation voir en pleine exploitation. Parmi ces... |
Tipo: Text |
Palavras-chave: Espadon; Évaluation de la ressource; Océan Atlantique; Océan Pacifique; Océan indien; Mediterranée; Pleine exploitation; TAC; Quota; Swordfish; Resources assessment; Atlantic ocean; Pacific ocean; Indien ocean; Mediterranean sea; Full exploitation; TAC; Quota. |
Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00001/11211/7565.pdf |
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Catchpole, T. L.; Feekings, J. P.; Madsen, N.; Palialexis, A.; Vassilopoulou, V.; Valeiras, J.; Garcia, T.; Nikolic, Natacha; Rochet, Marie-joelle. |
Discards refer to the part of the catch not retained on board during commercial fishing operations, but returned to the sea. The proposed European Union Common Fisheries Policy reform, to be implemented in 2014, sets out a gradual elimination of discards by reducing unwanted catches and ensuring that all catches are landed. To develop successful discard mitigation measures, it is necessary to identify the reasons for discarding. Here, we have developed a simple model that can be applied to data from observer programmes (ObsPs) to establish the contribution of different drivers of discarding behaviour. The analysis makes inferences on the causes of discarding by partitioning discards into four categories based on the length of the fish and the associated... |
Tipo: Text |
Palavras-chave: CFP; Discards; Fishers market; Quota. |
Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00159/27030/26202.pdf |
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Achterbosch, Thom J.; Dopfer, Dorte D.V.; Tabeau, Andrzej A.. |
Projections of live cattle trade in the EU-25 assist to reduce the uncertainty on the risk of importing animal diseases in the Netherlands. The accession of 10 member states to the European Union has a potentially large impact on livestock trade in the EU as it liberalized in one stroke a trade that was administered by the Management Committee for Beef until May 1, 2004. The approach combines AG-Memod partial equilibrium with GTAP general equilibrium modelling in order to estimate the impact of quota liberalization. Quota removal will substantially alter the regional structure of livestock imports, as the share of new EU member states in the east triples to 25%. The risk outlook indicates a need for enhanced animal health services in the new member states. |
Tipo: Conference Paper or Presentation |
Palavras-chave: Livestock; Animal disease; Trade; Projections; Quota; EU-enlargement; Risk and Uncertainty; F17; I18; Q17. |
Ano: 2005 |
URL: http://purl.umn.edu/24558 |
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Chen, Changping; Fletcher, Stanley M.. |
This study analyzed the potential economic impacts of the FAIR Act under GATT and NAFTA on the U.S. peanut industry. Results indicate that the economic impacts of the new program combined with the trade agreements are profound on the peanut industry in both short and long terms. Changes of the peanut program could decrease peanut producers' farm income substantially, eliminate government financial costs related to excessive quotas, and transfer peanut growers' program benefits back to peanut consumers. Increasing imports of foreign peanuts due to free/reduced trade barrier agreements would transfer peanut producers' program benefits to domestic peanut importers and foreign exporters who sell peanuts to the U.S. Note: Tables 3 and 4 not included in... |
Tipo: Working or Discussion Paper |
Palavras-chave: Economic impacts; FAIR Act; Peanuts; Quota; Support price; Agricultural and Food Policy; Crop Production/Industries. |
Ano: 1997 |
URL: http://purl.umn.edu/16698 |
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Buysse, Jeroen; Van der Straeten, Bart; Claeys, Dakerlia; Lauwers, Ludwig H.; Marchand, Fleur L.; Van Huylenbroeck, Guido. |
To explain over- and underuse of available quota, Buysse et al. (2007) have integrated the shadow cost of the quota constraint in a quota flexibility function in a positive mathematical programming model. This method and central hypothesis, formulated and tested for the case of Belgian sugar beet farms, is in current paper extended and confirmed for the cases of Flemish dairy quota and manure emission rights. Despite the different organisation, objectives and implementations of the diverse quota systems, the results are similar. A higher utilisation of quota is significantly driven by the quota rent, but farm characteristics are also important and the effect declines with increasing quota rent. Regardless the quota, the dairy quota flexibility behaviour of... |
Tipo: Conference Paper or Presentation |
Palavras-chave: Quota; Flexibility; Positive Mathematical Programming; Farm model; Common Agricultural Policy; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods. |
Ano: 2008 |
URL: http://purl.umn.edu/6640 |
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Bjerre, Markus; Jensen, Jorgen Dejgaard. |
The paper deals with problems concerning the current sugar policy within the Common Agricultural Policy, especially the efficiency losses due to the combination of high prices and quota on subsidised sugar production. Based on a simple econometric model, the total economic costs of the current policy setting, compared with an unregulated setting, are estimated to be in the area of 20 per cent of the total sugar production, valued at world market prices. Of these costs, some 10 per cent are due to inefficiency in the crop production, as the opportunity costs of land are not taken into account because the sugar price support within the quota overrules these opportunity costs. However, according to the estimates obtained in the present study, the main... |
Tipo: Conference Paper or Presentation |
Palavras-chave: Sugar production; Quota; Contracts; Efficiency loss; Production Economics. |
Ano: 2002 |
URL: http://purl.umn.edu/24840 |
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Brown, A. Blake; Martin, Laura L.. |
Declining domestic cigarette consumption, increased global competition, and loss of import restrictions indicate decreased demand for U.S. flue-cured tobacco. The effects of 10% declines in domestic and export demand are evaluated under a policy of reducing quota to maintain price versus a policy of allowing price to fall to maintain quota. Changes in prices, quantities, revenues, and economic rents are simulated. Losses to nonfarming quota owners are minimized under a policy of price maintenance, while losses in revenues to tobacco-producing areas are minimized by a policy of quota maintenance. Aggregate losses to tobacco growers are greater under a policy of quota maintenance. |
Tipo: Journal Article |
Palavras-chave: Flue-cured; Policy; Price reduction; Quota; Tobacco; Agricultural and Food Policy. |
Ano: 1996 |
URL: http://purl.umn.edu/15112 |
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Hennessy, David A.; Roosen, Jutta. |
Milk production is seasonal in many European countries. While quantity seasonality poses capacity management problems for dairy processors, a European Union policy goal is to reduce price seasonality. After developing a model of endogenous seasonality, we study the effects of three E.U. policies on production decisions. These are private storage subsidies, production removals, and production quotas. When cost functions are seasonal in a specified way, then arbitrage opportunities interact with storage subsidies to reduce both price and consumption seasonality. But production seasonality likely increases because storage subsidies promote temporal market integration. Conditions are identified under which product market interventions increase quantity... |
Tipo: Working or Discussion Paper |
Palavras-chave: Efficiency; Market intervention; Quota; Stabilization; Storage subsidies; Livestock Production/Industries. |
Ano: 2003 |
URL: http://purl.umn.edu/18587 |
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Registros recuperados: 17 | |
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