Theses and Dissertations-Biology

Seasonal Influence of Light Availability on Metabolism in an Urban, Spring-fed River

Stehle, Matthew (2022-12)

In aquatic ecosystems, temperature and light are the primary drivers of ecosystem metabolism, which is comprised of gross primary production (GPP) and ecosystem respiration (ER). However, light availability and temperature ...

Tufted Titmice, Black-crested Titmice, and their hybrids occupy different habitats within their hybrid zone

Martinez, Carli (2022-12)

Habitat can play a key role in either facilitating or preventing hybridization between some species. Within a hybrid zone, differences in habitat requirements could spatially separate two species to reduce hybridization. ...

Differential pathogenicity of Fusarium semitectum in Texas turtles

Smith, Denise L. (2000-05)

The Texas tortoise, Gopherus berlandieri, is susceptible to a fungal infection that presents as a white lesion on the thin epidermal scutes. Box turtles residing in the same environment are not susceptible. The fungal ...

Use of the MTT cell viability assay to determine antiviral activity

Southard, Gregory (2000-05)

No abstract prepared.

Woody plant effects on soil seed banks in a central Texas savanna

Ruiseco, Lana E. (1998-12)

Seed banks from three different habitats (grassland, recently-established junipers, and long-established live oak clusters) in a central Texas savanna ecosystem were compared to determine the effects of different woody ...

The effects of supersaturated nitrogen on the endangered fountain darter and the San Marcos salamander

Schaefer, Peter E. (2000-05)

A chronic and an acute toxicity test were conducted to determine the effects of dissolved nitrogen gas (DN) supersaturation on the fountain darter Etheostoma fonticola and the San Marcos salamander Eurycea nana. In the ...

The external structure of the head of Struthiolipeurus struthionis (Gervais 1844) with particular reference to the clypeus: An investigation of the relationship between the parasite and its host's (Struthio camelus l) feather

Rappe, Jodie D. (1998-12)

No abstract prepared.

Seasonal food habits of the white-tailed deer in the Cross Timbers and Prairies Ecological Region of Texas

Poor, Stuart L. (2000-05)

Food habits studies for white-tailed deer (Odocoileus virginianus) are numerous in most ecological regions of Texas. One unstudied region is the Cross Timbers and Prairies Ecological Region. In 1996-1998, the white-tailed ...

Investigation of bacterial fragmentation as a possible origin of nanobacteria

Prabhakaran, Sabitha (1999-08)

No abstract prepared.

Intermediate filaments in bluegill retinal pigment epithelial cells

Perez, Ernesto (1999-05)

The retinal pigment epithelium (RPE) is a layer of cuboidal cells located between the neural retina and choroid layers of the eye. In teleosts, long and short apical processes are characteristic of these cells (Zinn and ...

Bird activity and seed dispersal in two neotropical trees: Guarea macrophylla and Trichilia quadrijuga

Prado, Fred A. (1999-12)

In Manu National Park, Peru, l investigated bird activity on and seed dispersal of two sympatric neotropical rain forest trees: Guarea macrophylla and Trichilia quadrijuga. Of 24 bird species that consumed Guarea fruits, ...

A non-linear spotlight line transect method for estimating white-tailed deer population densities

Pierce, Brian L. (2000-05)

Accurate estimates of population density are a prerequisite for managing exploited white-tailed deer (Odocoileus virginianus) populations. Many state agencies rely upon density estimates obtained from spotlight strip ...

Composition of the woody plant understory of plateau live oak (Quercus virginiana var fusiformis) clusters in a central Texas savanna

Phillips, Patricia L. (1999-05)

Plateau live oak is thought to act as a nurse plant to other woody species on the Edwards Plateau of central Texas; however, little is known of the nature, extent and duration of this facilitation. In this study, a ...

The effects of several environmental variables on reproduction and growth of the San Marcos salamander in laboratory culture

Wise, Martn R. (1999-05)

Three 84-d experiments were conducted at the San Marcos National Fish Hatchery and Technology ~enter on the San Marcos salamanders Eurycea nana in an attempt to isolate factors that may be necessary for reproduction. Because ...

The Family Malvaceae (sensu stricto) in Texas

Gates, Marquise (2022-08)

Taxonomic keys are helpful devices that allow instructors, students, botanists, and others to identify unknown plant specimens. With respect to the flora of Texas, many of the currently available keys for flowering plant ...

Quantification of endocrine disrupting chemicals in central Texas rivers and associations with genomic variation in red shiners

Guzman, Alexis (2022-08)

Over the past decade, chemical pollution has increased in freshwater systems, including increases in endocrine disrupting compounds. One of the most prevalent of these chemical pollutants is 17α-ethinylestradiol (EE2), a ...

Repellent activity of DEET, Icaridin, Permethrin, lemon eucalyptus oil (Corymbia citriodora), and tea tree oil (Melaleuca alternifolia) against Ornithodoros turicata nymphs

Bowlsby, Michaela B. (2020-08)

Tick-borne diseases are among the fastest-growing infectious diseases in correlation with increased interactions with humans, wildlife, and livestock. Although tick-borne diseases have wide-ranging importance for public ...