Indirect management of invasive species through bio-controls: A bioeconomic model of salmon and alewife in Lake Michigan

Invasive species are typically viewed as an economic bad because they cause economic and ecological damages, and can be difficult to control. When direct management is limited, another option is indirect management via bio-controls. Here management is directed at the bio-control species population (e.g., supplementing this population through stocking) with the aim that, through ecological interactions, the bio-control species will control the invader. We focus on stocking salmon to control invasive alewives in Lake Michigan. Salmon are valuable to recreational anglers, and alewives are their primary food source in Lake Michigan. We illustrate how stocking salmon can be used to control alewife, while at the same time alewife can be turned from a net economic bad (having a negative shadow value) into a net economic good (having a positive shadow value) by providing valuable ecosystem services that support the recreational fishery. Using optimal control theory, we solve for a stocking program that maximizes social welfare. Optimal stocking results in cyclical dynamics. We link concepts of natural capital and indirect management, population dynamics, non-convexities, and multiple-use species and demonstrate that species interactions are critical to the values that humans derive from ecosystems. This research also provides insight into the management of salmon fisheries in the Great Lakes.     

Reconciling economic and biological modeling of migratory fish stocks: Optimal management of the Atlantic salmon fishery in the Baltic Sea

The paper puts forward a model of the Atlantic salmon fishery in the Baltic Sea that integrates the salient biological and economic characteristics of migratory fish stocks. Designed to be compatible with the framework used for actual stock assessments, the model accounts for age-structured population dynamics, the seasonal harvest and competing harvesting by commercial and recreational fishermen. It is parameterized for the Simojoki River stock. The socially optimal policy for maximizing discounted net benefits from the fishery within an uncertain environment is determined using a dynamic programming approach and numerical solution method. Our results indicate that substantial economic benefits could be realized under optimal management without compromising stock sustainability.     

鱼群洄游预测与生态经济问题研究

鱼群洄游预测研究对于渔业资源的可持续开发和利用是十分重要的。文章建立了基于RBF神经网络的鱼群洄游预测模型。研究结果表明,所提出的神经网络模型对于改进鱼群洄游的预测精度十分有效。渔业资源的可持续发展需要广泛、多领域的相互协作,并且需要自然科学与社会科学以及管理策略的相互结合。渔业生态经济的核心问题是处理好渔业经济发展与渔业生态保护的问题。     

TOWARD BEHAVIORAL MODELING OF ALASKA GROUNDFISH FISHERIES: A DISCRETE CHOICE APPROACH TO BERING SEA/ALEUTIAN ISLANDS TRAWL FISHERIES

This article implements a discrete choice model of fishery participation in the multispecies trawl fisheries of the Bering Sea/Aleutian Islands Region off Alaska. Nonparametric estimates of the operation-specific moments of quasirent by fishery and week are used to explain probabilities of choosing different target fisheries. There are pronounced risk aversion, seasonal, and relative performance effects. Notably, the model runs with regularly collected data, so this type of discrete choice modeling can be used routinely in the management and policy evaluation process. Improvements are needed, though, in both the quality and the extent of economic data on fisheries in Alaska and elsewhere in the United States. (JEL Q22, C25, Q28)     

A Bioeconomic Analysis of the Northern Baltic Salmon Fishery: Coexistence versus Exclusion of Competing Sequential Fisheries

We develop a bioeconomic model of the northern Balticsalmon fishery that takes into account thesimultaneous harvest of wild and reared salmon. Weassess the optimal harvest allocation between thecommercial offshore, inshore, and estuary fisheries,and the recreational river fishery that sequentiallyharvest the salmon stock. We restrict the solution tospawning stocks sufficient to preserve the wildsalmon. Empirical results suggest closure of theoffshore and inshore fisheries. Optimal managementenhances the wild stock, and results in substantialeconomic gains to the fishery. Current fisheryregulation improves the performance of the fisheryover open access, but fails to utilize the fullproductive potential of the resource.     

The Use and Abuse of Environmental Knowledge: A Bloomington School Interpretation of the Canadian Fisheries Act of 1868

This paper will focus on the ambitious plan for regulation embodied in the Dominion Fisheries Act of 1868, a law passed by the Canadian federal parliament in its very first year of existence. The 1868 law was intended to bring the nation's fisheries firmly under the control of officials employed by the new federal government. The paper argues that 1868 law, which was designed to address what would today be called Tragedy of the Commons problems, was a product of the hubris identified by Hayek as "the fatal conceit." The centralized and bureaucratic approach to governing fisheries represented by the 1868 Fisheries Act did not work well because the knowledge that would have been required for successful management of fisheries was highly dispersed. Drawing on Hayek and the Bloomington School, this paper argues that the experience of Canada's fisheries sector in the generation after 1868 illustrates the problems with centralized management Common-Pool Resources. In the 1890s, the centralized approach represented by the Fisheries Act of 1868 was replaced by a more flexible and decentralized system Hayek's theory of knowledge would suggest the reversal of centralization over environmental policy in the 1890s was a positive development that helped Canadians to reconcile the goals of economic development and the protection of the environment. The Hayekian paradigm suggests that control over environmental policy should be devolved downwards to the levels of government closest to resource users.     

Incentivizing sustainable waste management

The purpose of this paper is to contribute to the integration of economic and non-economic concepts of waste management and sustainability to achieve new insights to sustainable waste management. Since landfilling will continue to be a significant waste management method, our theory and practice of sustainable waste management should focus upon incentivizing the development of more sustainable landfills. The model sheds light on the design of efficient and fair landfill siting processes; how production inputs to bioreactor landfilling should be selected; and how management practices during the facility's operation phase can achieve greater economic, ecological and social sustainability.     

Modeling the dynamics of regulated resource systems: a fishery example

In this paper, a discrete-time model of regulated fisheries is developed. This class of models is interesting because most modern real-world fisheries are under some kind of regulation. The regulatory part of the fishery in this paper is partitioned into two stages. In the first stage, which is the main focus, total allowable catch quotas (TACs) based on biological and economic considerations are determined in a way that guarantees the safety of the stock from a conservation viewpoint. In addition, we assume that a target biomass level is set by the management authorities to be achieved over a given time horizon to satisfy an economic objective. Since we assume here that the main goal is to rebuild the stock, we propose a gradual approach to the target biomass level via a simple recursive rule.     

A note on the ecological-economic modelling of marine reserves in fisheries

This paper gives an overview of the bioeconomic modelling of marine reserves, and illustrates how economists have responded to the modelling results found in the ecological literature. The economic analysis is shown to be far more pessimistic with regards to the potential of marine reserves as a fisheries management tool, than what one finds in the purely ecological analysis, the reason being the latter's neglect of issues such as discounting and economic incentive behaviour. However, economic analysis, despite some of it being relatively advanced with regards to spatiality, is still simplistic with regards to for instance ecosystem and habitat content. A simple expansion of the existing bioeconomic models with regards to positive habitat effects of area closures is presented and analysed, showing room for improved results from marine reserve implementation as compared to the existing analysis.     

Fishery externalities and biodiversity: Trade-offs between the viability of shrimp trawling and the conservation of Frigatebirds in French Guiana

Sustainable management of natural resources, and in particular fisheries, must take into account several conflicting objectives. This is the case in the French Guiana shrimp fishery for which profitability objectives imply a reduction in the fishing activity. On the one hand, this fishery has negative externalities on marine biodiversity due to discards. On the other hand, this fishery has positive externalities on the economy of the local community and interestingly enough on a protected seabird species in the area (the Frigatebird that feeds on discards). In this paper, we examine the viability of that system considering two sustainability objectives: an economic objective in terms of the profitability of the fishing activity, and a conservation objective in terms of the Frigatebird population. For that purpose, we have developed a dynamic model of that bioeconomic system and study here the trade-offs between the two conflicting objectives. It provides a means to quantify the necessary give and takes involving the economic and ecological objectives that would ensure a viable management solution. Our study confirms the relevance of the viability approach to address natural resource management issues, which should lead to the development of new tools for the arbitration of conflicting sustainability objectives. In particular, such tools could be used as a quantitative basis for cost–benefit analysis taking into account environmental externalities.     

Estimating the impacts of eliminating fisheries subsidies on the small island economy of the Azores

A major problem affecting world fisheries today is overcapacity of which overfishing is both a cause and a consequence. There is a general consensus that fisheries subsidies cause great harm to the resource by exacerbating the problems resulting from the common resource issues of fisheries leading to overexploitation of the resource through a new set of perverse incentives. Many now advocate that subsidies should gradually be terminated, and that capacity enhancing and fuel subsidies should be terminated immediately. On account of the global fisheries crises, highly subsidised fisheries and the anticipated reforms of the European Union's Common Fisheries Policy this study aimed to estimate the impact of eliminating fisheries subsidies on various macro and micro economic variables pertaining to the regional economy of the Azores using a dynamic computable general equilibrium model based on a social accounting matrix. The simulation results suggest that reduction, and in particular, elimination of fisheries subsidies would have a substantial effect on the region, however, the negative social and economic effects would be largely confined to the fishing sector. Conversely, the augmentation of fishery subsidies would benefit the fishing sector with an overall adverse effect on the rest of the economy.     

Fishery externalities and biodiversity: Trade-offs between the viability of shrimp trawling and the conservation of Frigatebirds in French Guiana

Sustainable management of natural resources, and in particular fisheries, must take into account several conflicting objectives. This is the case in the French Guiana shrimp fishery for which profitability objectives imply a reduction in the fishing activity. On the one hand, this fishery has negative externalities on marine biodiversity due to discards. On the other hand, this fishery has positive externalities on the economy of the local community and interestingly enough on a protected seabird species in the area (the Frigatebird that feeds on discards). In this paper, we examine the viability of that system considering two sustainability objectives: an economic objective in terms of the profitability of the fishing activity, and a conservation objective in terms of the Frigatebird population. For that purpose, we have developed a dynamic model of that bioeconomic system and study here the trade-offs between the two conflicting objectives. It provides a means to quantify the necessary give and takes involving the economic and ecological objectives that would ensure a viable management solution. Our study confirms the relevance of the viability approach to address natural resource management issues, which should lead to the development of new tools for the arbitration of conflicting sustainability objectives. In particular, such tools could be used as a quantitative basis for cost–benefit analysis taking into account environmental externalities.     

北极渔业治理的研究综述

气候变暖下的北极渔业逐渐引起国际关注，而技术进步使人类进入北极成为可能，发展北极渔业成为缓解全球海洋渔业资源危机的可行方式。北极拥有丰富的渔业资源，但北极的生态环境极为脆弱，如何有序发展北极渔业、实现北极渔业的有效治理是当前国际社会议论的热点。运用文献综述法，对北极渔业资源相关研究进行归纳，从现有法律制度、管理组织、影响北极渔业治理的主要因素方面总结出北极的渔业治理与一般海洋渔业治理的不同之处，并对未来北极可行的渔业治理模式进行展望。     

Reducing Greenhouse Gas Emissions in Fisheries: The Case of Multiple Regulatory Instruments in Sweden

The fishing sector is a candidate for efficient climate policies because it is commonly exempted from greenhouse gas taxes and the fundamental problem of using a common pool resource is far from optimally solved. At the same time, fisheries management has other objectives. This study uses Swedish fisheries to analyse how the fishing sector and its climate impact are affected by regulations aiming at: (1) solving the common pool problem (2) taxing greenhouse gas emissions and (3) maintaining small-scale fisheries. The empirical approach is a linear programming model where the effects of simultaneously using multiple regulations are analyzed. Solving the common pool problem will lead to a 30 % reduction in emissions and substantially increase economic returns. Taxing greenhouse gas emissions will further reduce emissions. Policies for maintaining the small-scale fleet will increase the size of this fleet segment, but at the cost of lower economic returns. However, combining this policy with fuel taxes will reduce the size of the small-scale fleet, thus counteracting the effects of the policy. If taxation induces fuel-saving innovations, it is shown that this will affect not only emissions and fleet structure, but also quota uptake.     

Challenges for economic policy in sustainable management of marine natural resources

The sustainable management of marine natural resources presents particular challenges to the managers of those resources. While such management has typically been based on biological considerations, it is argued that this has resulted in overexploitation and destruction of important marine assets in industries such as fishing and tourism. Consequently, it is concluded that other approaches are needed, with the use of economic concepts and management tools particularly relevant. At the same time, the human welfare outcomes of the application of various policy instruments must be carefully considered. While biological information is critical to the formulation and implementation of successful management regimes, it is concluded that the application of economic instruments will become more attractive to resource managers, with these instruments underpinned by consideration of property rights and an appropriate allocation of economic rents. A greater focus on these economic matters will take resource managers further in the direction of sustainable management of increasingly scarce marine resources. The conclusions in the paper are supported by various case studies from fisheries and tourism.     

Post–Privatization Effects of Management and Employee Buy–outs

Management and employee buy–outs have played a significant role in the privatization of state–owned enterprises. Key research and policy issues are raised concerning whether insider ownership promotes or impedes restructuring and adaptation. This paper reviews and synthesizes studies of the effects of privatization management and employee buy–outs in both developed and transition economies. Trends in privatization buy–outs and conceptual issues concerning the expected effects of privatization buy–outs both in terms of performance and survival are discussed. A review of empirical evidence is presented in terms of the impact of buy–outs on employee attitudes, human resource management, strategy and restructuring, financial and economic performance, together with fresh evidence on survival. Privatization buy–outs can lead to significant restructuring but their impact depends on institutional context and policy. Restructuring may be greater where insiders purchase shares rather than acquiring them virtually free through voucher programmes.     

Evolution of infant and child mortality in Chile: a model

The author contends that birth rate and infant and child mortality rates are jointly determined by demographic, economic, health care, and other influences. Working under this structural assumption, a multiequation model is developed, estimated, and simulated, in which real earnings, unemployment, midwife visits, access to cheap energy, public health expenditures, and degree of urbanization are determinant factors of declining infant and child mortality in Chile. Most notably, mortality declined during a period of increasing unemployment and falling living standards for at least part of the population. The study found all 3 rates to be jointly determined, but by different variables. Specifically, unemployment affected birth rate and child mortality rate, while declining infant mortality was based upon midwife visits, health expenditure, and access to cheap energy. At the policy level, trade-offs often result between infant and child mortality, especially where high birth rates prevail. Where movement along the Phillips curve is possible, higher earnings should be preferred over lower unemployment for the benefit of infant and child mortality. Preferred policy would week to provide a carefully balanced combination of better earnings and more midwife visits.     

Bioeconomic Analysis and Management

This article discusses bioeconomic analysis and different management strategies in fisheries. It reviews recent developments, which show the need to expand the analysis to multispecies fisheries and management. Significant gains can be made if the interdependencies between species and/or jointness in inputs for many fisheries are identified. Both common property resource management and individual transferable quotas (ITQs) can be fruitful strategies in different settings. The article suggests that there is scope for the development of a multiple use management approach of marine resources. Besides the aim of an efficient use of fish stocks, equal attention should be given to other values from aquatic ecosystems, like ecological services, biodiversity and recreation possibilities.     

Analysis of marine ecological compensation for environmental risk caused by chemical spill based on game theory

The problem of marine environmental risk is ultimately the result of game theory between the marine environmental managers and the enterprise of potential environmental risk. This paper analyzes the internal economic relationship that whether the “protection” policy is applied between the protection action of marine environmental managers and the chemical enterprise. The result shows that the key factor whether the enterprise adopt the “protection” policy or not is the amount of penalty and the government＇s cost of execution, and the compulsive ecological compensation is obligatory from the angle of stimulating the enterprise of canonical action and adopting the “protection” policy. To build the ecological compensation mechanism based on the environmental risk will effectively improve the level of management in sea area and decrease the probability of chemical spill.     

基于演化博弈的监测—约束—激励系统生态补偿机制研究——以旅游胜地漓江流域为例

"两山"理论要求重构"经济—环境"生态,因地制宜设计生态补偿机制。以漓江流域作为研究对象,利用演化博弈理论分析不同情境下漓江流域各主体策略的演化趋势,再使用SD进一步模拟仿真,结论如下:(1)上下游地方政府实施策略概率的初始值会影响最终的稳定状态;(2)仅依靠上下游政府的相互自发监督,不能有效实施利于生态补偿的合作机制;(3)上下游都不履行义务时的惩罚应比只有一方不履行义务时的惩罚更大,上下游履行义务时的奖励应比不实现合作时的惩罚更大;(4)当中立机构监管流域水质状态时,上游提供给下游的补贴应该比下游给上游的生态补偿更少。据此提出漓江流域生态补偿机制政策建议。