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Registros recuperados: 7
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ANTHROPAGENIC AND NATURAL DETERMINANTS OF THE POPULATION OF A SENSITIVE SPECIES: SAGE GROUSE IN NEVADA AgEcon
van Kooten, G. Cornelis; Eagle, Alison J.; Eiswerth, Mark E..
This paper uses Nevada data to conduct regression analyses of the relationship between sage grouse (Centrocercus urophasianus) population sizes and potential causal factors. This is policy-relevant because of current petitions for listing this species under the Endangered Species Act. A key feature is that, although monitoring of sage grouse has occurred for many decades, data collection methods and level of monitoring effort have not been consistent. To account for this feature we use, as dependent variables, standardized measures such as population counts and harvest (hunting success) per unit of effort. Preliminary findings suggest that such measures have been particularly sensitive to whether or not humans used strychnine for predator control, with...
Tipo: Working or Discussion Paper Palavras-chave: Resource /Energy Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/18163
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ANTHROPOGENIC AND NATURAL DETERMINANTS OF THE POPULATION OF A SENSITIVE SPECIES: SAGE GROUSE IN NEVADA AgEcon
van Kooten, G. Cornelis; Eagle, Alison J.; Eiswerth, Mark E.; Feng, Hui.
This paper uses Nevada data to conduct regression analyses of the relationship between sage grouse (Centrocercus urophasianus) population sizes and potential causal factors. This is policy-relevant because of current petitions for listing this species under the Endangered Species Act. A key feature is that, although monitoring of sage grouse has occurred for many decades, data collection methods and level of monitoring effort have not been consistent. To account for this feature we use, as dependent variables, standardized measures such as population counts and harvest (hunting success) per unit of effort. Preliminary findings suggest that such measures have been particularly sensitive to whether or not humans used strychnine for predator control, with...
Tipo: Conference Paper or Presentation Palavras-chave: Resource /Energy Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/20382
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Dynamic Programming and Learning Models for Management of a Nonnative Species AgEcon
Eiswerth, Mark E.; van Kooten, G. Cornelis; Lines, Jeff M.; Eagle, Alison J..
Nonnative invasive species result in sizeable economic damages and expensive control costs. Because dynamic optimization models break down if controls depend in complex ways on past controls, non-uniform or scale-dependent spatial attributes, etc., decision support systems that allow learning may be preferred. We compare three models of an invasive weed in California’s grazing lands: (1) a stochastic dynamic programming model, (2) a reinforcement-based, experience-weighted attraction (EWA) learning model, and (3) an EWA model that also includes stochastic forage growth and penalties for repeated application of environmentally harmful control techniques. Results indicate that EWA learning models may be appropriate for invasive species management.
Tipo: Working or Discussion Paper Palavras-chave: Invasive weed species; Optimal control; Adaptive management; Environmental Economics and Policy; C73; Q57.
Ano: 2005 URL: http://purl.umn.edu/37015
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Economic Impacts of Yellow Starthistle on California Ranchers AgEcon
Eagle, Alison J.; Eiswerth, Mark E.; Johnson, Wayne S.; Schoenig, Steve E.; van Kooten, G. Cornelis.
While the significant ecosystem damage caused by invasive weeds has been well documented, the economic impacts of specific invasive weed species are poorly understood. Yellow starthistle (Centaurea solstitialis L., hereafter YST) is the most widespread non-crop weed in California, resulting in serious damage to forage on natural range and improved pasture. A survey was administered to California cattle ranchers to investigate YST infestation rates, loss of forage quantity and value, and control or eradication efforts. The results were used to estimate county-wide economic losses for three focus counties, as well as state-wide economic losses, due to YST in California. Total losses of livestock forage value due to YST on private land for the state of...
Tipo: Working or Discussion Paper Palavras-chave: Nonnative species; Invasive weeds; Yellow starthistle; Ranching profitability; Forage; Livestock; Crop Production/Industries; Environmental Economics and Policy; Livestock Production/Industries; Q24; Q57.
Ano: 2006 URL: http://purl.umn.edu/37028
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Prevention or Control: Optimal Government Policies for Invasive Species Management AgEcon
Kim, C.S.; Lubowski, Ruben N.; Lewandrowski, Jan; Eiswerth, Mark E..
We present a conceptual, but empirically applicable, model for determining the optimal allocation of resources between exclusion and control activities for managing an invasive species with an uncertain discovery time. This model is used to investigate how to allocate limited resources between activities before and after the first discovery of an invasive species and the effects of the characteristics of an invasive species on limited resource allocation. The optimality conditions show that it is economically efficient to spend a larger share of outlays for exclusion activities before, rather than after, a species is first discovered, up to a threshold point. We also find that, after discovery, more exclusionary measures and fewer control measures are...
Tipo: Journal Article Palavras-chave: Invasive species; Exclusion; Control; Eradication; Public expenditures; Environmental Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/10176
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The Ghost of Extinction: Preservation Values and Minimum Viable Population in Wildlife Models AgEcon
van Kooten, G. Cornelis; Eiswerth, Mark E..
The inclusion of a minimum viable population in bioeconomic modeling creates at least two complications that are not resolved by using a modified logistic growth function. The first complication can be dealt with by choosing a different depensational growth function. The second complication relates to the inclusion of the in situ benefits of wildlife into the analysis. Knowledge about the magnitude of the in situ benefits provides no guide for policy about conservation management. Simply knowing that people are willing to pay a large amount each year to protect a species says nothing about whether one should manage habitat to protect or enhance the species’ numbers, unless the species is in imminent danger of extinction. If willingness to pay is to be a...
Tipo: Conference Paper or Presentation Palavras-chave: Marginal willingness to pay; Endangered species and extinction; Minimum viable population; Resource /Energy Economics and Policy; Q20; Q24; C61.
Ano: 2007 URL: http://purl.umn.edu/9790
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The Ghost of Extinction: Preservation Values and Minimum Viable Population in Wildlife Models AgEcon
van Kooten, G. Cornelis; Eiswerth, Mark E..
The inclusion of a minimum viable population in bioeconomic modeling creates at least two complications that are not resolved by using a modified logistic growth function. The first complication can be dealt with by choosing a different depensational growth function. The second complication relates to the inclusion of the in situ benefits of wildlife into the analysis. Knowledge about the magnitude of the in situ benefits provides no guide for policy about conservation management. Simply knowing that people are willing to pay a large amount each year to protect a species says nothing about whether one should manage habitat to protect or enhance the species’ numbers, unless the species is in imminent danger of extinction. If willingness to pay is to be a...
Tipo: Working or Discussion Paper Palavras-chave: Marginal willingness to pay; Endangered species and extinction; Minimum viable population; Environmental Economics and Policy; Q20; Q24; C61.
Ano: 2008 URL: http://purl.umn.edu/37912
Registros recuperados: 7
Primeira ... 1 ... Última
 

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