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Physical Sciences and Mathematics Commons™
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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Bat Use Of Afforested And Encroached Patches And Their Role In Extending Bat Habitat Into The Nebraska Sandhills, Jacob L. Wagner
Bat Use Of Afforested And Encroached Patches And Their Role In Extending Bat Habitat Into The Nebraska Sandhills, Jacob L. Wagner
School of Natural Resources: Dissertations, Theses, and Student Research
The Nebraska Sandhills are currently undergoing a state shift to a redcedar dominated woodland due to anthropologic planting of eastern redcedar (Juniperus virginiana) and woody encroachment from the periphery of the Sandhills. To better understand this novel ecosystem and how bats are utilizing it I collected data at Barta Brothers Ranch with acoustic sensor grids consisting of 24 100m spaced acoustic sensors placed adjacent to planted windbreaks. Supplemental data from the Nebraska North American Bat Monitoring Program was used for data analysis at larger spatial scales. I used linear regressions and kriging interpolation maps to see how bats used windbreaks …
Coupling Dendrochronology And Remote Sensing Techniques To Assess The Biophysical Traits Of Juniperus Virginiana And Pinus Ponderosa Within Grassland Communities In The Semi-Arid Grasslands Of The Nebraska Sandhills, Reece Allen
School of Natural Resources: Dissertations, Theses, and Student Research
Woody species encroachment is occurring within the sandhills region in Nebraska, primarily driven by Juniperus virginiana and Pinus ponderosa, altering ecosystems and the services they provide. Effective, low cost, and cross-scale monitoring of woody species growth and performance is necessary for integrated grassland and forest management in the face of climate variability and change. In this study, we sought to establish a relationship between remote sensing-derived vegetation indices (VIs) and dendrochronological (raw and standardized tree ring width) measurements to assess the performance of encroaching woody J. virginiana and P. ponderosa located within the Nebraska National Forest in the sandhills. …
Prairie Grouse Population Trends And Their Historical Drivers In The Nebraska Sandhills, Danielle Berger
Prairie Grouse Population Trends And Their Historical Drivers In The Nebraska Sandhills, Danielle Berger
School of Natural Resources: Dissertations, Theses, and Student Research
The Nebraska Game and Parks Commission (NGPC) has monitored greater prairie-chickens (Tympanuchus cupido pinnatus) and plains sharp-tailed grouse populations (Tympanuchus phasianellus jamesi), collectively known as prairie grouse, since the 1950s using spring breeding ground counts. My research modeled long-term, species-specific spatial and temporal trends of prairie grouse abundance and potential environmental drivers in the Sandhills of Nebraska using NGPC’s historical monitoring data. Prairie-chicken populations have increased since the 1950s while sharp-tailed grouse populations have remained stable or slightly declined. These population trends arise in the context of a dynamic landscape. I created indices representing raptor predation …
Evaluation Of Evaporative Drivers And Hydrologic Influences Using Energy And Water Budget Techniques At A Shallow Saline Lake In The Western Sandhills Of Nebraska, Usa, Colin Peake
School of Natural Resources: Dissertations, Theses, and Student Research
The western Sandhills of Nebraska contain many shallow lakes and wetlands that interact strongly with groundwater and the overlying atmosphere. The region is semi-arid, and most of the lakes are saline, supporting a wide range of ecosystems. Water levels and salt concentrations are highly sensitive to variations in precipitation, evaporation, and groundwater fluxes, making the Sandhills an excellent laboratory for examining the effects of climate on the water balance of interdunal lakes. In this study, we investigate the atmospheric controls on evaporation rates, as well as the water balance of Alkali Lake, one of the more saline lakes in the …
Breeding Fidelity And Landscape Effects On Distribution Of Mallards And Duck Broods In The Nebraska Sandhills, Zachary J. Cunningham
Breeding Fidelity And Landscape Effects On Distribution Of Mallards And Duck Broods In The Nebraska Sandhills, Zachary J. Cunningham
School of Natural Resources: Dissertations, Theses, and Student Research
I investigated aspects of mallard (Anas platyrhnchos) breeding ecology in the Nebraska Sandhills during 2007-2008. Previous work in this region suggests that nest success is low for a large area of intact grassland such as the Sandhills. My goal was to conduct a local-scale examination of age distribution and return rates of mallards, and a large-scale examination of brood distribution in the Sandhills region as a whole. This information will help explain factors contributing to the low nest success previously observed, determine relationships between landscape composition and spatial distribution of waterfowl in the Sandhills, and predict productivity and …
Applications Of Remote Sensing And Gis To The Studies Of Groundwater-Lake Interactions In The Nebraska Sandhills, Evgueni N. Tcherepanov
Applications Of Remote Sensing And Gis To The Studies Of Groundwater-Lake Interactions In The Nebraska Sandhills, Evgueni N. Tcherepanov
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Effects Of The Plains Pocket Gopher (Geomys Bursarius) On Hay Meadows And Irrigated Alfalfa In The Nebraska Sandhills, Patrick J. Hegarty
Effects Of The Plains Pocket Gopher (Geomys Bursarius) On Hay Meadows And Irrigated Alfalfa In The Nebraska Sandhills, Patrick J. Hegarty
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.