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Full-Text Articles in Life Sciences

Ecological And Economic Implications Of Increased Storm Frequency And Severity For Boreal Lakes, Kathryn Warner May 2019

Ecological And Economic Implications Of Increased Storm Frequency And Severity For Boreal Lakes, Kathryn Warner

Electronic Theses and Dissertations

In boreal regions, increased precipitation events have been linked to increased concentrations of dissolved organic carbon (DOC), however less is known about the extent and implications of these events on lakes. We assessed the effects of precipitation events on six drinking water lakes in Maine, USA to better understand how DOC concentration and quality change in response to precipitation events. Our results revealed three types of responses: (1) an initial spike in DOC concentrations and quality metrics; (2) a sustained increase in DOC concentrations and quality metrics and; (3) no change during all sampling periods. Lake residence time was a ...


The Economic And Social Values Associated With Small South Dakota Lakes, Aaron Patrick Sundmark Jan 2019

The Economic And Social Values Associated With Small South Dakota Lakes, Aaron Patrick Sundmark

Electronic Theses and Dissertations

The valuation of small fishing lakes is a vital component in understanding the importance of fishing and of recreational resources, in general. Knowing the values associated with such lakes is essential when prioritizing management activities. The overall value of a lake as a resource for human benefit is estimated as the summation of both instrumental and non-instrumental values. Instrumental values consist of economic and utilitarian values, as well as the values that a lake provides from ecosystem services. Non-instrumental values consider what the lake is worth as a good of its own, such as aesthetic, moral, and spiritual values gained ...


An Empirical Analysis Of Climatic, Geographic, And Cultural Determinants Of International Tourism, Ethan Straus Jun 2018

An Empirical Analysis Of Climatic, Geographic, And Cultural Determinants Of International Tourism, Ethan Straus

Honors Theses

Each year, billions of people visit different countries all around the world. For many of those countries, tourism is their primary industry, leading to millions of jobs and dollars in revenue. It is expected that by 2020 total International Tourism Receipts will reach 2 trillion US dollars annually. Currently, tourism employs an estimated 200 million people around the world. With the continued progression of climate change, the tourism industry is facing a newfound threat. Global temperatures and the seal level are both expected to rise significantly by the end of the century. Additionally, the Intergovernmental Panel on Climate Change has ...


Ratios And Benchmarks As Tools For Local Food Hub Decision-Making: A Comparative Case Study, Savanna May Lyons Jan 2016

Ratios And Benchmarks As Tools For Local Food Hub Decision-Making: A Comparative Case Study, Savanna May Lyons

Graduate Theses and Dissertations

Food hubs, or local food aggregation and distribution businesses, are triple-bottom-line firms that play an increasingly important role in connecting small and mid-sized farmers to wholesale and retail markets. This paper explores how food hubs can use their financial data to identify and address strengths and challenges in their operations. We propose a “dashboard” of key metrics and benchmarks for food hub managers, and apply it a comparative case study of four food hubs over three years of operations. We compare and contrast the liquidity, cash flow, efficiency, solvency and repayment capacity of the four cases, and analyze cross-cutting themes ...


An Analysis Of The Iowan Angler's Fishing License Renewal Decision, Ryan R. French Jan 2006

An Analysis Of The Iowan Angler's Fishing License Renewal Decision, Ryan R. French

Retrospective Theses and Dissertations

The number of annual fishing licenses sold in Iowa has been in decline for two decades and has limited the amount of funds available to the Iowa Department of Natural Resources for fisheries management. The Iowa DNR is focused on reversing this trend through targeted marketing and efficient management of fishing resources. An analysis of Iowa anglers is performed with these goals in mind using past surveys and current customer data. The product of this analysis is a model which predicts whether a past customer will renew their license in the upcoming year. A logit model is developed using license ...


Insuring Uncertainty In Value-Added Agriculture: Ethanol, Nicholas David Paulson Jan 2004

Insuring Uncertainty In Value-Added Agriculture: Ethanol, Nicholas David Paulson

Retrospective Theses and Dissertations

A wide variety of insurance products are currently available for agricultural producers to insure against yield or price risks in the markets for the raw commodities they produce. Value-added enterprises, such as ethanol production, have become increasingly popular among farmers over the last decade; however, insurance against declines in the value-added portion of their crops is not yet available. This paper outlines the development of an insurance product aimed at corn producers who are members of an ethanol production cooperative. The product mimics the gross margin level of a typical ethanol production facility, and has the potential to provide producers ...


The Economic Potential Of Switchgrass As A Viable Biofuel Alternative, Jennifer E. Reutzel Jan 2004

The Economic Potential Of Switchgrass As A Viable Biofuel Alternative, Jennifer E. Reutzel

Retrospective Theses and Dissertations

To be commercially viable as a bioenergy feedstock, switchgrass must be cost-competitive. Switchgrass production and delivery costs are calculated for the Chariton Valley Switchgrass Biomass Project located in the Chariton Valley, Iowa. Sensitivity analyses are performed to determine which variables have the greatest impact on cost. Switchgrass production costs would require higher than expected market prices, and therefore various incentive payment options are considered. The incentive payments attempt to encapsulate the positive environmental attributes from the production of switchgrass as well as using switchgrass as a clean energy coal substitute. A modified CRP payment, carbon payment, and green tag payment ...


Land Preservation Decisions: Theoretical And Empirical Analysis , Shikha Marwah Jan 2004

Land Preservation Decisions: Theoretical And Empirical Analysis , Shikha Marwah

Retrospective Theses and Dissertations

There is a great concern that human actions are leading to increased rates of extinction of species. Ecologists have pointed out that the most important threat to wildlife comes from habitat alteration. The rapidly increasing human population and the resulting pressing demand for food and living space are pushing highly diverse natural areas into agriculture and other alternative uses. Recognizing this, the Federal agencies and private organizations, such as the Nature Conservancy, are becoming increasingly engaged in programs for conservation of species, where habitat restoration is an important component. However, this conservation is costly and there is uncertainty in the ...


Factors Affecting Symbolic And Use Adoption Of Local Foods For Consumers In Black Hawk County, Iowa, Erin M. Tegtmeier Jan 2003

Factors Affecting Symbolic And Use Adoption Of Local Foods For Consumers In Black Hawk County, Iowa, Erin M. Tegtmeier

Retrospective Theses and Dissertations

A local food system may be an alternative to the increasingly globalized and concentrated food market and a means to augment the availability of fresh foods, create economically viable options for farmers and enhance the health of local ecosystems. Consumers are a vital component of these systems. Insight into the decision-making process surrounding the purchase of local foods can aid in efforts to build thriving local food systems. Studies on consumer attitudes show that, in general, consumers are aware and supportive of local foods. Abstract or civic factors, such as concern for the environment or food safety, are often identified ...


Economic Analysis Of Pesticide Regulation In The U.S. Apple Industry , Jutta Roosen Jan 1999

Economic Analysis Of Pesticide Regulation In The U.S. Apple Industry , Jutta Roosen

Retrospective Theses and Dissertations

Several particularities of apple production systems require careful consideration of the methods used to estimate impacts of pesticide regulation. Growing conditions are geographically diverse, quality considerations are of particular importance, and dynamic aspects need to be acknowledged in production systems of perennial crops;A partial-equilibrium model of the apple industry is estimated where orchards are modeled as multiproduct firms producing apples for fresh and processed consumption. Groups of growers are distinguished by region and by pesticide use patterns. The changes of quantities and prices in the markets for fresh and processed apples that follow a technology shift are derived. Economic ...


Valuing Environmental Amenities With Nonparametric And Semiparametric Methods , John Russell Crooker Jan 1998

Valuing Environmental Amenities With Nonparametric And Semiparametric Methods , John Russell Crooker

Retrospective Theses and Dissertations

The dissertation consists of three essays. Each essay is presented in its own chapter beginning with chapter II. While each chapter is written as a stand alone document, the essays complement each other in subject matter, methodology and relevance to the econometrics and natural resource economics literature. In particular, the most fundamental problem investigated is how can we, as precisely as possible, value non-market goods without making parametric assumptions that may influence welfare estimates;The three essays comprising this dissertation contribute to the knowledge of the economics valuation literature in several important ways. First, semi-nonparametric and nonparametric estimators are rigorously ...


Hog Industry And Hog Production Related Water Pollution Problem In Taiwan: An Application To Valuing The Willingness To Pay For Improving Water Quality, Kuo-Chang Ro Jan 1997

Hog Industry And Hog Production Related Water Pollution Problem In Taiwan: An Application To Valuing The Willingness To Pay For Improving Water Quality, Kuo-Chang Ro

Retrospective Theses and Dissertations

No abstract provided.


Economic Feasibility Of Growing Herbaceous Biomass Energy Crops In Iowa , Young-Woo Park Jan 1996

Economic Feasibility Of Growing Herbaceous Biomass Energy Crops In Iowa , Young-Woo Park

Retrospective Theses and Dissertations

Depletion of natural energy resources and environmental degradation caused by current energy resources (fossil fuels) have rekindled interest in energy availability and developing environmentally benign and renewable alternative energy resources. In addition, the reduced productive capacity of soil and environmental problems in rural areas caused by the loss of topsoil has created interest in ways to conserve soil;These concerns have generated considerable attention on the production of herbaceous energy crops on marginal land as a possible solution to meeting future energy demands, addressing environmental concerns, and reducing soil erosion;This research suggests that herbaceous energy crops, especially switchgrass, can ...


An Evaluation Of The Impacts Of Land Voiding Caused By Degrading Waterways: An Engineering Economic Approach, Landon Leath Morris Jan 1994

An Evaluation Of The Impacts Of Land Voiding Caused By Degrading Waterways: An Engineering Economic Approach, Landon Leath Morris

Retrospective Theses and Dissertations

No abstract provided.


Papers On The Role Of Natural Resources In International Trade , Edward Osei Jan 1994

Papers On The Role Of Natural Resources In International Trade , Edward Osei

Retrospective Theses and Dissertations

In this work we present three papers that consider the economic implications of international trade in goods when exhaustible natural resources are used as inputs in the production process. In the first paper we investigate the possibility of violation of the static trade theorems when natural resource intensities in two goods are different. In this and the second paper we build on the generalized H-O framework of Kemp and Long (1984). The second paper analyzes the dynamic implications of incorporating natural resources into trade models. Issues relating to production and trade patterns and natural resource extraction rates are investigated under ...


Environmental Pollution Control Under Alternative Incentive Structures , Ramu Govindasamy Jan 1993

Environmental Pollution Control Under Alternative Incentive Structures , Ramu Govindasamy

Retrospective Theses and Dissertations

The present study examines environmental pollution control under alternative incentive structures with an emphasis on the effectiveness and practicality of alternative policy tools. The focus is on three instruments for controlling pollution: (1) Environmental Bonds; (2) Budget Balancing Incentive Mechanisms; and (3) Environmental Rank Order Tournaments;Environmental bonds typically require more information for implementation than either budget balancing incentive mechanisms or rank order tournaments. However, there is a trade-off between the cost savings from acquiring information and the potential costs from committing an error in assigning pollution control responsibility;Paper I examines the limits to environmental bonds. It identifies three ...


Tradeoffs In Balancing Multiple Objectives Of An Integrated Agricultural Economic And Environmental System , P. G. Lakshminarayan Jan 1993

Tradeoffs In Balancing Multiple Objectives Of An Integrated Agricultural Economic And Environmental System , P. G. Lakshminarayan

Retrospective Theses and Dissertations

This research, which integrates the economic and environmental processes in a multiobjective framework to find comprehensive solution, is a departure from the traditional approach. The problem is motivated by multiattribute utility and social welfare theory, and the conditions for optimality are derived. Since agricultural nonpoint source pollution (NPS) pollution is a nonmarket externality, a motivation based on public policy and social costs is provided to include environmental quality decisions. A conceptual framework for integrating the multidisciplinary models is presented. The environmental data needs of the integrated system was obtained from spatially simulated predictions of the biogeophysical process model, a mathematical ...


The Economics Of Food Safety: An Experimental Approach , Seung Youll Shin Jan 1991

The Economics Of Food Safety: An Experimental Approach , Seung Youll Shin

Retrospective Theses and Dissertations

Food safety issues have received increased attention from scientific and consumer groups alike in recent years. Pathogenic microbiological agents have been shown to be a major contributor to food-borne illnesses in the United States. The presence and cost of these pathogens has become a major issue for policy makers, consumers, and producers;Estimated economic losses to society attributable to food-borne diseases have been large. These estimated losses usually have been based on direct consumer losses and likely represent an underestimation of the true economic costs. Morbidity costs, such as consumers' willingness to pay (WTP) to reduce their chance of becoming ...


An Economic Analysis Of Alternative Environmental And Resource Policies For Controlling Soil Loss And Sedimentation From Agriculture , David John Walker Jan 1977

An Economic Analysis Of Alternative Environmental And Resource Policies For Controlling Soil Loss And Sedimentation From Agriculture , David John Walker

Retrospective Theses and Dissertations

No abstract provided.


An Economic Analysis Of Field Crop Production, Insecticide Use And Soil Erosion In A Subbasin Of The Iowa River , Klaus Friedrich Alt Jan 1976

An Economic Analysis Of Field Crop Production, Insecticide Use And Soil Erosion In A Subbasin Of The Iowa River , Klaus Friedrich Alt

Retrospective Theses and Dissertations

No abstract provided.


A National Model Of Energy Use In Agricultural Production , Dan Dvoskin Jan 1976

A National Model Of Energy Use In Agricultural Production , Dan Dvoskin

Retrospective Theses and Dissertations

No abstract provided.


Impact Of Water Right Constraints On The Regional Allocation Of Agricultural Production , William Arden Colette Jan 1975

Impact Of Water Right Constraints On The Regional Allocation Of Agricultural Production , William Arden Colette

Retrospective Theses and Dissertations

No abstract provided.


Stream Sediment Movement, Water Quality And Agricultrual Production: A Modeling Approach To Economic And Environmental Analysis , James Carl Wade Jan 1975

Stream Sediment Movement, Water Quality And Agricultrual Production: A Modeling Approach To Economic And Environmental Analysis , James Carl Wade

Retrospective Theses and Dissertations

No abstract provided.


A Model Of Optimum Water Allocation Under Iowa's Permit System, Richard Allan Baldwin Jan 1970

A Model Of Optimum Water Allocation Under Iowa's Permit System, Richard Allan Baldwin

Retrospective Theses and Dissertations

No abstract provided.


Water Resources Allocation In Ghana In The Post-Volta Dam Era: A Linear Programming Approach, William Kobena Gyapea Erbynn Jan 1967

Water Resources Allocation In Ghana In The Post-Volta Dam Era: A Linear Programming Approach, William Kobena Gyapea Erbynn

Retrospective Theses and Dissertations

No abstract provided.


Economic Incentives For Pheasant Production In Iowa, Harlan David Cook Jan 1967

Economic Incentives For Pheasant Production In Iowa, Harlan David Cook

Retrospective Theses and Dissertations

No abstract provided.


Farmer Owned And Operated Outdoor Recreation Enterprises In Iowa, Leonard Bull Jan 1966

Farmer Owned And Operated Outdoor Recreation Enterprises In Iowa, Leonard Bull

Retrospective Theses and Dissertations

No abstract provided.


Estimation Of Optimum Farm Size In The Gotalands Forest Region Of Sweden, Kurt Inge Allan Ledje Jan 1961

Estimation Of Optimum Farm Size In The Gotalands Forest Region Of Sweden, Kurt Inge Allan Ledje

Retrospective Theses and Dissertations

No abstract provided.