Theses
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 100 theses authored by our scientists going back to 1959 and refine search by topic, location, year, and advanced search.
Filter Total Items: 158
A cost-benefit analysis of preventative management for zebra and quagga mussels in the Colorado-Big Thompson System
Zebra and quagga mussels are fresh water invaders that have the potential to
cause severe ecological and economic damage. It is estimated that mussels cause $1
billion dollars per year in damages to water infrastructure and industries in the
United States (Pimentel et al., 2004). Following their introduction to the Great
Lakes in the late 1980s, mussels spread rapidly throughout the Mississipp
Authors
Catherine M. Thomas
Maintaining population persistence in the face of an extremely altered hydrograph: implications for three sensitive fishes in a tributary of the Green River, Utah
The ability of an organism to disperse to suitable habitats, especially in modified and fragmented systems, determines individual fitness and overall population viability. The bluehead sucker (Catostomus discobolus), flannelmouth sucker (Catostomus latipinnis), and roundtail chub (Gila robusta) are three species native to the upper Colorado River Basin that now occupy only 50% of their historic ra
Authors
Jared L. Bottcher
A large volume striped bass egg incubation chamber: design and comparison with a traditional method
I conducted a comparative study of a new jar design (experimental chamber) with a standard egg incubation vessel (McDonald jar). Experimental chambers measured 0.4 m in diameter by 1.3 m in height and had a volume of 200 L. McDonald hatching jars measured 16 cm in diameter by 45 cm in height and had a volume of 6 L. Post-hatch survival was estimated at 48, 96 and 144 h. Stocking rates resulted in
Authors
C.J. Harper
Vertical tritium transport from the shallow unsaturated zone to the atmosphere, Amargosa Desert Research Site, Nevada
No abstract available.
Authors
C.A. Garcia
Chronic wasting disease infection patterns in female white-tailed deer related to demographics, genetic relationships, and spatial proximity of infected deer in southern Wisconsin
Chronic wasting disease (CWD) is a fatal disease of white-tailed deer (Odocoileus virginianus) caused by transmissible protease resistant prions. Since the discovery of CWD in southern Wisconsin in 2001, more than 20,000 deer have been removed from a >2,500 km2 disease eradication zone surrounding the three initial cases. Nearly all deer removed were tested for CWD infection and sex, age, and harv
Authors
Daniel A. Grear
Evaluating hydraulic conductivity of desert soils at the Amargosa Desert Research Site near Beatty, Nevada
No abstract available.
Authors
J.W. Wilson
Geographic variation in morphology, diet, and ectoparasites of Myotis occultus in New Mexico and southern Colorado
No abstract available.
Authors
Ernest W. Valdez
Toward predicting barrier island vulnerability: Simple models for dune erosion
The objective of this study is to quantify the accuracy of two engineering models for dune erosion (SBEACH and EDUNE), and to determine which of the two models is best suited for predicting barrier island vulnerability due to extreme storm events. The first model, SBEACH, computes sediment transport using empirically derived equations from two large wave tank experiments. The second model, EDUNE,
Authors
Laura A. Fauver, Peter A. Advised by Howard
Population demography of lark buntings: Post-fledging survival, fecundity, and breeding decisions
No abstract available.
Authors
Amy A. Yackel Adams
The depositional history of three freshwater lakes in north central Florida: Brooklyn Lake, Levy's Prairie, and Cowpen Lake
Florida has approximately 7800 lakes that are heavily concentrated in the north-central part of the state—a mantled karst terrain. Although much research has been conducted in Florida’s lakes, there is not much information on the sedimentary infill. The focus of this research is to define the sedimentary infill of three closely spaced lakes (Brooklyn Lake, Levys Prairie, and Cowpen Lake) in north-
Authors
Nancy T. DeWitt
Mapping porewater salinity with electromagnetic and electrical methods in shallow coastal environments: Terra Ceia, Florida
No abstract available.
Authors
W.J. Greenwood, Sarah Advised by Kruse
Extraction of paleohydrology and paleoclimate proxies from vadose zones and paleolake records in the southwestern Great Basin
No abstract available.
Authors
Weiquan Dong