A Predator-Prey Model with an Application to Lake Victoria Fisheries

Brown, Gregory A.; Berger, Brett D.; Ikiara, Moses

doi:10.1086/mre.20.3.42629473

Cited by 26 publications

(18 citation statements)

References 21 publications

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“…Yet, our survey, primarily asking non-fishermen, find that a vast majority hold that the impact of the fish factories and the fish export is primarily negative, leading to increasing fish prices and reduced availability. Brown et al (2005a) showed the biological interrelationship between dagaa and Nile perch implying that fishing down the Nile perch stock may increase the abundance of dagaa, which in turn implies changing fishing patterns. Mkumbo et al (2002) confirm recovery of Haplochromis and other prey species as the Nile perch stock has been 26 reduced.…”

Section: An Alternative Methods Of Comparing Welfarementioning

confidence: 99%

Trade and resources: Welfare effects of the Lake Victoria fisheries boom

Greaker

Kidane

2015

Fisheries Research

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In this paper we examine the welfare implications of the Tanzanian fisheries boom following from the increase in quantities and prices of the Lake Victoria Nile perch export during [1993][1994][1995][1996][1997][1998][1999][2000][2001][2002][2003][2004][2005][2006][2007][2008]. We use the theoretical model by Brander and Taylor (1997) that we try to test empirically.We have a micro level perspective using data from a 1993 World Bank household survey and our own study from 2008, both containing data from about 520 households in the two regions Mwanza and Mara by the lake. Our results indicate that average income has increased in both rural and urban areas. For the poorest part of the population, rural areas experienced only modestly and non-significantly reductions in the fraction below basic needs, while urban areas had a substantial reduction. However, growth was modest and inequality seems to have increased during the period. Concerning human capital measured as education for the household head we found substantial improvements in educational level and a simple regression model confirmed the significant impact of education on household income. We also found that households on average are better off when situated close to the lake. Acknowledgement

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Section: An Alternative Methods Of Comparing Welfarementioning

confidence: 99%

Trade and resources: Welfare effects of the Lake Victoria fisheries boom

Greaker

Kidane

2015

Fisheries Research

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“…Bulte and Horan (2003) adopt a similar growth equation incorporating a habitat effect for a single species model. 4 See Hannesson (1983), Ragozin and Brown (1985), and Brown et al (2005) for bioeconomic applications making this assumption. 5 It is well documented that foxes, raccoons and other small mammalian predators have higher densities in human land-use areas (Riley et al 1998), reducing bird and amphibian populations (Engeman et al 2010).…”

Section: Ecological Modelmentioning

confidence: 99%

Interspecies Management and Land Use Strategies to Protect Endangered Species

Melstrom

Horan

2013

Environ Resource Econ

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We consider an ecosystem management problem where managers can use habitat creation and predator removal to conserve an endangered species. Predator removal may become particularly important in the face of habitat loss, and ecosystem management strategies that ignore the influence of habitat are likely to be inefficient. Using a bioeconomic model, we show that the marginal impact of prey habitat on predators is a key factor in determining the substitutability or complementarity of habitat and removal controls. Applying the model to the case of the endangered Atlantic-Gaspésie Woodland Caribou (rangifer tarandus caribou), we find that the first-best strategy involves extensive caribou habitat protection and a large predator cull initially, and then substituting habitat investments for predator removal as both populations begin to recover, suggesting that habitat protection and predator removal are effectively substitute controls.3

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“…Biological interactions among fish stocks can dominate the structuring of marine ecosystems and so can strongly affect the population dynamics tions. Yet marine research in this area has expanded significantly over the past few decades [1]- [6] [8] [9] [10] [11]. Hence we can now extend the classic bioeconomic model by considering the implications of dependencies, both ecological and technological, that arise in multispecies fisheries [12].…”

Section: Introductionmentioning

confidence: 99%

“…Practically speaking, sustainable performance is hard to achieve at the ecological level among all the species in a multispecies fishery [26]. Furthermore, the fact that the management of a multispecies fishery must also incorporate economic variables [11] cussions for the biomass of other species with which there is a trophic interaction (altering the tonnage would also affect, at least some, within-fishery species that were not "targets"). Such catch differences can ultimately affect the sustainability of the ecosystem and of the enterprises that depend on it.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fisheries Management under Ecological Interdependence: The Case of European Hake and Blue Whiting Fishery

Pérez‐Pérez¹,

Garza‐Gil²,

Varela-Lafuente³

2017

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In mixed fisheries where there is an increased ecological interdependence between two or more target species, the possibilities of fishing these species must be determined jointly, since catches of one species will impact the natural growth not only of that species but of the others, as well. The objective of this paper is to develop a predator-prey model for two major species caught by the EU fishing fleet on European Union fishing grounds. The predator and prey's population dynamics follow the Lotka-Volterra equation and are assumed to be logic-based, and a lineal interaction between the predator and prey populations is assumed. Optimal single owner multispecies fishery management is analysed, and the applied model is solved, obtaining the equilibrium value of biomasses, catches, and net benefits of the mixed fishery. The results show that the MSY of the predator is higher than that estimated by ICES, while MSY for prey is lower. The sensitivity analysis of the results reveals that the biomass levels of both species decrease as the discount rate increases, while catches increase.

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A Predator-Prey Model with an Application to Lake Victoria Fisheries

Cited by 26 publications

References 21 publications

Trade and resources: Welfare effects of the Lake Victoria fisheries boom

Trade and resources: Welfare effects of the Lake Victoria fisheries boom

Interspecies Management and Land Use Strategies to Protect Endangered Species

Fisheries Management under Ecological Interdependence: The Case of European Hake and Blue Whiting Fishery

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