Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

Natural Resources Management and Policy

University of Nebraska - Lincoln

PDF

2005

Articles 1 - 21 of 21

Full-Text Articles in Physical Sciences and Mathematics

Maximum Size Of Fish Caught With Standard Gears And Recreational Angling, Kevin L. Pope, Gene R. Wilde, Daryl L. Bauer Oct 2005

Maximum Size Of Fish Caught With Standard Gears And Recreational Angling, Kevin L. Pope, Gene R. Wilde, Daryl L. Bauer

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

We correlated maximum lengths of freshwater fishes captured during 10 years with standard gears (i.e., gill nets, boat electrofishers and trap nets) and angling from Nebraska water bodies to determine which methodology provided better estimates of maximum size of fishes produced within a given water body. In general, maximum length of fishes captured with standard gears was smaller than maximum length of fishes captured with angling. Although significant (based on sequential Bonferroni adjustment) correlation was found in only one of nine sport fishes assessed, all correlations were positive indicating a general trend between maximum size of fishes captured with these …

Go to article

Analyses Of High Resolution Hyperspectral Imagery For Characterization Of Ponderosa Pine Woodlands, Cullen R. Robbins Aug 2005

Analyses Of High Resolution Hyperspectral Imagery For Characterization Of Ponderosa Pine Woodlands, Cullen R. Robbins

School of Natural Resources: Dissertations, Theses, and Student Research

The Bessey Unit of the Nebraska National Forest is a planted ponderosa pine forest located in the Nebraska Sand Hills. Planted in the early 20th Century, it provides a unique opportunity to study the effects of ponderosa pine establishment on the surrounding grassland ecosystem and the effects of increasing pine density on the forest ecosystem. It has been hypothesized that there are key levels of canopy cover at which shifts in ecosystem function occur. The goal of this research was to use remotely sensed data to develop a reliable method for estimating canopy cover. More specifically, canopy cover was estimated …

Go to article

Factors Affecting Songbird Nest Survival And Brood Parasitism In The Rainwater Basin Region Of Nebraska, Max Post Van Der Burg Aug 2005

Factors Affecting Songbird Nest Survival And Brood Parasitism In The Rainwater Basin Region Of Nebraska, Max Post Van Der Burg

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Go to article

The July 2003 Dakota Hailswaths: Creation, Characteristics, And Possible Impacts, Matthew D. Parker, Ian Ratcliffe, Geoffrey M. Henebry Jul 2005

The July 2003 Dakota Hailswaths: Creation, Characteristics, And Possible Impacts, Matthew D. Parker, Ian Ratcliffe, Geoffrey M. Henebry

School of Natural Resources: Faculty Publications

The authors investigate the meteorology associated with two elongated swaths of crop damage produced by severe hailstorms that crossed North Dakota and South Dakota on 4 July and 20 July 2003. These hailswaths, which were observed in a Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) image time series, each persisted for more than a month and were associated with local temperature increases, presumably owing to the enhanced Bowen ratio over dry, crop-free ground. This paper documents the creation and evolution of the convective storms that produced the hailswaths, and then presents evidence that devegetated hailswaths may impact …

Go to article

Seasonal And Interannual Varialbility In Evapotranspiration Of Native Tallgrass Prairie And Cultivated Wheat Ecosystems, By G.G. Burba, S.B. Verma, George G. Burba, Shashi B. Verma Jul 2005

Seasonal And Interannual Varialbility In Evapotranspiration Of Native Tallgrass Prairie And Cultivated Wheat Ecosystems, By G.G. Burba, S.B. Verma, George G. Burba, Shashi B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.

Go to article

2002 Licensed Angler Survey: Summarized Results, Keith L. Hurley, Kristin L. Duppong-Hurley May 2005

2002 Licensed Angler Survey: Summarized Results, Keith L. Hurley, Kristin L. Duppong-Hurley

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

On October 22, 2002, 5000 six-page surveys (Appendix 3) were sent to a stratified-random sample of Nebraska anglers drawn from the 2001 licensed anglers database. The database included all anglers who purchased a fishing license in 2001 as well as all lifetime fishing permit holders who purchased their license before or during 2001. The database did not include those possessing a free permit, such as veteran’s or senior citizen permits. The survey subsample (2.6% of the 2001-licensed angler database) was stratified such that the proportions of surveys in the subsample (4366 residents and 634 non-residents) matched the proportions of resident/non-resident …

Go to article

Nebraska Catfish Anglers: Descriptions And Insights Derived From The 2002 Nebraska Licensed Angler Survey, Keith Hurley, Kristin Duppong-Hurley Apr 2005

Nebraska Catfish Anglers: Descriptions And Insights Derived From The 2002 Nebraska Licensed Angler Survey, Keith Hurley, Kristin Duppong-Hurley

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

Analyses in this report will refer to number of different groups. Catfish seeking anglers are defined as any angler who has spend at least 1 trip during 2002 in pursuit of a catfish species (channel, blue, flathead, or bullhead). This is the most general group included in the analyses and is also the least avid group of anglers in regards to their relationship to catfish angling. Catfish anglers are defined as those respondents who identified a catfish species as the species they most prefer to target. Catfish anglers represent a smaller group of respondents with a higher avidity for catfish …

Go to article

Influence Of A Hailstreak On Boundary Layer Evolution, Zewdu T. Segele, David J. Stensrub, Ian C. Ratcliffe, Geoffrey M. Henebry Jan 2005

Influence Of A Hailstreak On Boundary Layer Evolution, Zewdu T. Segele, David J. Stensrub, Ian C. Ratcliffe, Geoffrey M. Henebry

School of Natural Resources: Faculty Publications

Severe thunderstorms developed on 20 June 1997 and produced heavy precipitation, damaging winds, and large hail over two swaths in southeastern South Dakota. Calculations of fractional vegetation coverage (scaled from 0 to 1) based upon composite satellite data indicate that, within the hailstreak region, vegetation coverage decreased from 0.50 to near 0.25 owing to the damaging effects of hail on the growing vegetation. The northern edge of the larger hailstreak was located a few kilometers south of Chamberlain, South Dakota, a National Weather Service surface observation site. Hourly observations from Chamberlain and several nearby surface sites in South Dakota are …

Go to article

Quality Control Of Pre-1948 Cooperative Observer Network Data, Kenneth E. Kunkel, David R. Easterling, Kenneth Hubbard, Kelly Redmond, Karen Andsager, Michael C. Kruk, Michael L. Spinar Jan 2005

Quality Control Of Pre-1948 Cooperative Observer Network Data, Kenneth E. Kunkel, David R. Easterling, Kenneth Hubbard, Kelly Redmond, Karen Andsager, Michael C. Kruk, Michael L. Spinar

School of Natural Resources: Faculty Publications

A recent comprehensive effort to digitize U.S. daily temperature and precipitation data observed prior to 1948 has resulted in a major enhancement in the computer database of the records of the National Weather Service’s cooperative observer network. Previous digitization efforts had been selective, concentrating on state or regional areas. Special quality control procedures were applied to these data to enhance their value for climatological analysis. The procedures involved a two-step process. In the first step, each individual temperature and precipitation data value was evaluated against a set of objective screening criteria to flag outliers. These criteria included extreme limits and …

Go to article

Effects Of Spring Supplementary Feeding On Population Density And Breeding Success Of Released Pheasants Phasianus Colchicus In Britain, Roger A. H. Draycott, Maureen I. A. Woodburn, John P. Carroll, Rufus B. Sage Jan 2005

Effects Of Spring Supplementary Feeding On Population Density And Breeding Success Of Released Pheasants Phasianus Colchicus In Britain, Roger A. H. Draycott, Maureen I. A. Woodburn, John P. Carroll, Rufus B. Sage

School of Natural Resources: Faculty Publications

The release of hand-reared ring-necked pheasants Phasianus colchicus in summer is a common practice in Britain to increase the number of birds available to hunters in winter. The breeding success of the birds which survive the shooting season is poor. Traditionally, birds are provided with supplementary wheat grain from release until the end of the shooting season (1 February) to maintain body condition and to help hold birds in areas for hunting. During 1997- 2000 we assessed the effect of continuing supplementary feeding into spring on pheasant density and breeding success on seven private shooting estates. On each estate we …

Go to article

Social Science To Improve Fuels Management: A Synthesis Of Research Relevant To Communicating With Homeowners About Fuels Management, Martha C. Monroe, Lisa Pennisi, Sarah Mccaffrey, Dennis Mileti Jan 2005

Social Science To Improve Fuels Management: A Synthesis Of Research Relevant To Communicating With Homeowners About Fuels Management, Martha C. Monroe, Lisa Pennisi, Sarah Mccaffrey, Dennis Mileti

School of Natural Resources: Faculty Publications

No abstract provided.

Go to article

Discrete State-Space Approximation Of The Continuous Kalinin-Milyukov-Nash Cascade Of Noninteger Storage Elements, Jozsef Szilagyi Jan 2005

Discrete State-Space Approximation Of The Continuous Kalinin-Milyukov-Nash Cascade Of Noninteger Storage Elements, Jozsef Szilagyi

School of Natural Resources: Faculty Publications

No abstract provided.

Go to article

Flow Routing With Unknown Rating Curves Using A State-Space Reservoir-Cascade-Type Formulation, Jozsef Szilagyi, Gabor Balint, Balazs Gauzer, Peter Bartha Jan 2005

Flow Routing With Unknown Rating Curves Using A State-Space Reservoir-Cascade-Type Formulation, Jozsef Szilagyi, Gabor Balint, Balazs Gauzer, Peter Bartha

School of Natural Resources: Faculty Publications

No abstract provided.

Go to article

Effects Of Climate And Landcover Change On Stream Discharge In The Ozark Highlands, Usa, Q. Steven Hu, Gary D. Willson, Xi Chen, Adnan Adnan Jan 2005

Effects Of Climate And Landcover Change On Stream Discharge In The Ozark Highlands, Usa, Q. Steven Hu, Gary D. Willson, Xi Chen, Adnan Adnan

School of Natural Resources: Faculty Publications

Stream discharge of a watershed is affected and altered by climate and landcover changes. These effects vary depending on the magnitude and interaction of the changes, and need to be understood so that local water resource availability can be evaluated and socioeconomic development within a watershed be pursued and managed in a way sustainable with the local water resources. In this study, the landcover and climate change effects on stream discharge from the Jacks Fork River basin in the Ozark Highlands of the south-central United States were examined in three phases: site observation and data collection, model calibration and simulation, …

Go to article

Some Concerns When Using Data From The Cooperative Weather Station Networks: A Nebraska Case Study, Hong Wu, Kenneth G. Hubbard, Jinsheng You Jan 2005

Some Concerns When Using Data From The Cooperative Weather Station Networks: A Nebraska Case Study, Hong Wu, Kenneth G. Hubbard, Jinsheng You

School of Natural Resources: Faculty Publications

In this study, daily temperature and precipitation amounts that are observed by the Cooperative Observer Program (COOP) were compared among geographically close stations. Hourly observations from nearby Automatic Weather Data Network (AWDN) stations were utilized to resolve the discrepancies between the observations during the same period. The statistics of maximum differences in temperature and precipitation between COOP stations were summarized. In addition, the quantitative measures of the deviations between COOP and AWDN stations were expressed by root-mean-square error, mean absolute error, and an index of agreement. The results indicated that significant discrepancies exist among the daily observations between some paired …

Go to article

Optimizing Allocation Of Monitoring Effort Under Economic And Observational Constraints, Scott A. Field, Andrew J. Tyre, Hugh P. Possingham Jan 2005

Optimizing Allocation Of Monitoring Effort Under Economic And Observational Constraints, Scott A. Field, Andrew J. Tyre, Hugh P. Possingham

School of Natural Resources: Faculty Publications

Efforts to design monitoring regimes capable of detecting population trends can be thwarted by observational and economic constraints inherent to most biological surveys. Ensuring that limited resources are allocated efficiently requires evaluation of statistical power for alternative survey designs. We simulated the process of data collection on a landscape, where we initiated declines over 3 sample periods in species of varying prevalence and detectability. Changing occupancy levels were estimated using a technique that accounted for effects of false-negative errors on survey data. Declines were identified within a frequentist statistical framework, but the significance level was set at an optimal level …

Go to article

Steroid Hormone Levels Are Related To Choice Of Colony Size In Cliff Swallows, Charles R. Brown, Mary Bomberger Brown, Samrrah A. Raouf, Linda C. Smith, John C. Wingfield Jan 2005

Steroid Hormone Levels Are Related To Choice Of Colony Size In Cliff Swallows, Charles R. Brown, Mary Bomberger Brown, Samrrah A. Raouf, Linda C. Smith, John C. Wingfield

School of Natural Resources: Faculty Publications

One hypothesis to explain the extensive variation in colony size seen in most
taxa is that individuals sort themselves among groups based on phenotypic characteristics
that correlate with their performance in groups of different sizes. We investigated how
baseline levels of the steroid hormones, corticosterone and testosterone, were associated
with choice of colony size and the likelihood of moving to a different site in later years
in colonially nesting Cliff Swallows (Petrochelidon pyrrhonota) in southwestern Nebraska,
USA, in 2000–2004. We sampled hormone levels of birds caught at colonies and, using
mark–recapture, monitored their movement and choice of colony size …

Go to article

Characterizing Moisture Regimes For Assessing Fuel Availability In North Carolina Vegetation Communities, Roberta A. Bartlette, James Reardon, Gary M. Curcio Jan 2005

Characterizing Moisture Regimes For Assessing Fuel Availability In North Carolina Vegetation Communities, Roberta A. Bartlette, James Reardon, Gary M. Curcio

JFSP Research Project Reports

In the southeastern United States prescription burning, fire danger rating and wildfire suppression strategies are constrained by limited knowledge of the influence of moisture content in live vegetation, organic soils, water table and weather. The interactive influence of these factors on fire behavior is not well studied. The 3+ year long study reported here was conducted to gain direct empirical understanding of seasonal fuel and soil moisture dynamics in shrub-dominated pocosin communities, in coastal Virginia and North Carolina, mixed hardwoods communities containing significant laurel and rhododendron understory fuels in western North Carolina and eastern Tennessee, and longleaf pine communities in …

Go to article

Fuel Reduction And Restoration Of Pine/Hardwood Ecosystems Severely Impacted By The Recent Southern Pine Beetle (Dendroctonus Frontalis) Epidemic In The Southern Appalachians, James M. Vose, Katherine J. Elliott Jan 2005

Fuel Reduction And Restoration Of Pine/Hardwood Ecosystems Severely Impacted By The Recent Southern Pine Beetle (Dendroctonus Frontalis) Epidemic In The Southern Appalachians, James M. Vose, Katherine J. Elliott

JFSP Research Project Reports

As a result of this most recent SPB epidemic (1999-2003), thousands of hectares of dead pine trees have created wildfire-hazard conditions in the southern Appalachians. One of the challenges for land managers is how to return fire to these ecosystems after (1) nearly a decade of exclusion, and (2) the more recent SPB mortality enhanced fuel loads. Higher fuel loads have the potential to increase fire intensity and severity. At the extremes, fires of high intensity and severity can have a large effect on ecosystem structure and function. The objectives of our research were: (1) to quantify fuel load reduction …

Go to article

The Evolution Of A Warm Season Severe Eastern Kentucky Flash Flood, C. Henry, R. Mahmood, C. Smallcomb, M. Mclane, D. Champlin Jan 2005

The Evolution Of A Warm Season Severe Eastern Kentucky Flash Flood, C. Henry, R. Mahmood, C. Smallcomb, M. Mclane, D. Champlin

School of Natural Resources: Faculty Publications

No abstract provided.

Go to article

An Assessment Of Key Aspects Of Warm And Cool Season Severe Flash Flooding In The Southern Appalachians, W. M. Baldwin, R. Mahmood Jan 2005

An Assessment Of Key Aspects Of Warm And Cool Season Severe Flash Flooding In The Southern Appalachians, W. M. Baldwin, R. Mahmood

School of Natural Resources: Faculty Publications

No abstract provided.

Go to article