نتایج جستجو برای: q57

تعداد نتایج: 56  

2009
Stefan Baumgärtner Sebastian Strunz

Ecosystem resilience, i.e. an ecosystem’s ability to maintain its basic functions and controls under disturbances, is often interpreted as insurance: by decreasing the probability of future drops in the provision of ecosystem services, resilience insures risk-averse ecosystem users against potential welfare losses. Using a general and stringent definition of ‘insurance’ and a simple ecological-...

2016
David Finnoff Arthur J. Caplan DAVID FINNOFF

111 We present a computable general equilibrium model of the interface between the Great Salt Lake (GSL) ecosystem and the regional economy that impacts the ecosystem. With respect to the ecosystem, the model treats the various representative species as net-energy maximizers and bases population dynamics on the period-by-period sizes of surplus net energy. Energy markets-where predators and pre...

2015
David Finnoff John Tschirhart

Although ecosystems provide myriad services to economies, only one service is considered in most renewable-resource models. The general equilibrium bioeconomic model introduced here admits a second service, and more importantly it accounts for how the two services are impacted by interactions within an eight-species ecosystem and interactions within a regional economy. Endangered Steller sea li...

2015
Craig A. Bond

The wetlands of the Gulf Coast region of the United States are under pressure from relative sea level rise and subsidence pressures that threaten to alter fishery breeding grounds and increase expected damage from stochastic storm events, among other issues. Barrier islands, marshes, and swamps are thus forms of natural capital that serve both an intermediate role in supporting fishery stocks, ...

2005
Martin F. Quaas Stefan Baumgärtner

The ecological literature suggests that biodiversity reduces the variance of ecosystem services. Thus, conservative biodiversity management has an insurance value to risk-averse users of ecosystem services. We analyze a conceptual ecological-economic model in which such management measures generate a private benefit and, via ecosystem processes at higher hierarchical levels, a positive external...

2006

Once established, invasive species can rapidly and irreversibly alter ecosystems and degrade the value of ecosystem services. Optimal control of an exotic pest solves for a trajectory of removals that minimizes the present value of removal costs and residual damages from the remaining pest population. The shrubby tree, Miconia calvescens, is used to illustrate dynamic policy options for a fores...

2007
Stefan Baumgärtner Martin F. Quaas

Strong sustainability, according to the common definition, requires that different natural and economic capital stocks have to be maintained as physical quantities separately. Yet, in a world of uncertainty this cannot be guaranteed. To therefore define strong sustainability under uncertainty in an operational manner, we propose to use the concept of viability. Viability means that the differen...

2012
Tatiana Kiseleva Florian Wagener

We develop a method of obtaining an asymptotic series of the value function of a stochastic optimal control problem over an unbounded domain with a finite number of irregularity points. These are points of non-differentiability of the value function of the corresponding deterministic problem. We apply singular perturbation methods to obtain the solution approximation in regions of regularity an...

2009
Jayanath Ananda Gamini Herath

JEL classification: C65 D81 Q23 Q57 This paper provides a review of research contributions on forest management and planning using multicriteria decision making (MCDM) based on an exhaustive literature survey. The review primarily focuses on the application aspects highlighting theoretical underpinnings and controversies. It also examines the nature of the problems addressed and incorporation o...

2006
Brooks Kaiser Kimberly Burnett James Roumasset

The threat of invasive species stems from their ability to rapidly and irreversibly change ecosystems and degrade the value of ecosystem services. Optimal control of a pre-established exotic pest minimizes the costs of population reduction plus the residual damages from the remaining pest population. The shrubby tree, Miconia calvescens, is used to illustrate dynamic policy options for a forest...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید