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Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
The Study Of The Parasitic Fauna In Sciaenops Ocellatus, Lower Laguna Madre, Texas, Veronica Abrigo
The Study Of The Parasitic Fauna In Sciaenops Ocellatus, Lower Laguna Madre, Texas, Veronica Abrigo
Theses and Dissertations - UTB/UTPA
Parasitological investigations provide information on ecosystem health because parasite prevalence and abundance are influenced by biotic and abiotic environmental changes. This survey classified the parasitic fauna of red drum, Sciaenops ocellatus, in the Lower Laguna Madre, TX. Fish (n = 239) were collected from four study sites (May 2005 - June 2006). Parasite identification consisted of digenean and monogenean trematodes, cestodes, larval nematodes, copepods, and protozoans. Parasite prevalence and host length was positively correlated from South Bay (r=0.473), Port Isabel (r=0.533), Arroyo(r=0.314), and Port Mansfield (r=0.630). Significant differences (p<0.001) between zone and parasite prevalence from Arroyo site indicated a higher prevalence of protozoa and monogeneans and reduced prevalence of digeneans. Statistical analyses indicated the greatest difference between Port Isabel and Arroyo sites ( divided by 2= 48.195; p<0.001; df= 14), and the least difference between South Bay and Arroyo sites ( divided by 2= 20.847; p= 1.06; df= 14).
Characterization And Antibiotic Resistance Profile Of Staphylococci In The Lower Rio Grande Valley, Diana E. Trevino
Characterization And Antibiotic Resistance Profile Of Staphylococci In The Lower Rio Grande Valley, Diana E. Trevino
Theses and Dissertations - UTB/UTPA
Staphylococci from part of the natural flora of humans and some, like Staphylococcus aureus, appear to be evolving antibiotic resistance. The Lower Rio Grande Valley (LRGV) is an area of interest due to its proximity to the US/Mexico border where antibiotics could recently be purchased without prescription. Two libraries from community association (CA-S) and environmental association (E-S) have been collected and the staphylococci isolated. We hypothesize that their SCCmec type, which aids the staphylococci in antibiotic resistance, will not display classically defined association schemes and will surface in many species of staphylococci. This study generates antibiotic resistance profiles via antibiotic …
Monitoring Atrazine-Degrading And Atrazine-Tolerant Bacterial Populations In Lower Rio Grande Valley Agricultural Canals Using Quantitative-Pcr And Internal Atza Primers, Ibdanelo Cortez
Theses and Dissertations - UTB/UTPA
The research hypothesis was that atrazine-degrading bacteria would be detectable during the planting and rainy seasons with their populations dissipating during non-planting and dry seasons in 2010-2011. Atrazine concentration was detected in March, May, June and August for all canals with June having the highest average concentration of 0.77ppb. Gene atzA abundance was detected from June through August with July samples having the highest gene abundance of 250.6 (pg). Tolerant bacterial densities were detectable from March through June. Atrazine concentration and population abundance were not statistically different during planting and non-planting, rainy and dry seasons, although there was a trend …
Variation In Parenting Style In A Captive Group Of Western Lowlands Gorillas, Ana E. Fernandez
Variation In Parenting Style In A Captive Group Of Western Lowlands Gorillas, Ana E. Fernandez
Theses and Dissertations - UTB/UTPA
Parenting styles were examined in a group of western lowland gorillas to determine the relationship between parenting style and multiple births with a single individual. Another interest in this study was on varying ways that motherhood can be approached, with partial attention to the relationship between parenting style and social rank. Observational data was collected by means of focal animal sampling and used to analyze contact behaviors in mother-infant relationship. Results indicated that parenting style stayed consistent within the same mother, but different between mothers.
Comparison Of Soil Chemistry And Microbial Communities That Inhabit The Rhizosphere Of Native And Non-Native Grasses Of The Lower Rio Grande Valley, Jacqueline Valencia
Comparison Of Soil Chemistry And Microbial Communities That Inhabit The Rhizosphere Of Native And Non-Native Grasses Of The Lower Rio Grande Valley, Jacqueline Valencia
Theses and Dissertations - UTB/UTPA
Non-native grasses can modify the soils they invade. This study investigated microbial variation among native and non-native grasses in the Lower Rio Grande Valley. We hypothesized that rhizospheres of non-native grasses would support a higher density of microorganisms; therefore microbial communities of invasive plants would exploit more carbon sources than those of native plants. A second hypothesis stated that Streptomyces bacteria from the rhizosphere of non-native grasses would be better competitors. Samples of grasses, and soil from their respective rhizospheres were obtained in Arroyo City, TX. Results indicated a higher bacterial colony density, total activity and number of substrates utilized …