While researchers have long recognized the disproportionate impact of natural disasters on racial and ethnic communities, research remains incomplete in examining the plight of Gulf Coast Vietnamese residents after Hurricane Katrina and the Deepwater Horizon oil spill. This study presents a comprehensive, qualitative investigation of three different Vietnamese communities located in New Orleans, Biloxi, and Bayou La Batre and details how residents established and maintained nonprofit community based organizations in a region that previously saw little or no formal mobilization among Vietnamese residents. Existing studies tend to isolate the extent to which variables such as language, culture, social networks, and religious institutions, influence recovery outcomes. In contrast, this study, by drawing upon multiple avenues of data collection, including 54 in-depth interviews, fieldwork, and participant observation, provides an ethnographic analysis of immigrant community building via the unique circumstances of post-crisis community rebuilding. Findings reveal that despite the differences among by the study sites, one overarching theme emerges: new Gulf South Vietnamese organizations struggled to bridge gaps and build relationships as they sought to transition the community of inexperienced, naive, or complacent Vietnamese locals from loose, informal networks to structured organizational forms. This work examines the challenges faced by organizations as they become established and the strategies by which they grow and become sustainable. Suggestions for how ethnic organizations may better serve and perform outreach into Vietnamese enclaves are presented in the form of lessons learned. Ultimately, this study extends the established literature on the Vietnamese experience in the United States and contributes to the overall canon of research regarding Hurricane Katrina and the Deepwater Horizon oil spill. / acase@tulane.edu

Over the past decades, coastal areas in the United States have experienced exponential increases in economic losses due to flooding, hurricanes, and tropical storms. This in part is due to increasing concentrations of human populations in high-risk coastal areas. Although significant progress has been made in developing mitigation measures to reduce losses in these areas, economic losses have continued to mount. The increase in losses has led to a significant change in hazard research by putting more emphasis on disaster resilience. While there has been a growing interest in the concept of disaster resilience, to date there is little or no empirical research that has focused on systematically measuring this concept. Therefore, the main objective of this dissertation was to develop a theoretically-driven index that can be used to measure disaster resilience in coastal communities. This dissertation argues that a comprehensive measure of disaster resilience should address issues of relevance to all phases of disaster: mitigation, preparedness, response, and recovery. Furthermore, a fruitful approach to measure disaster resilience is to assess various forms of capital: social, economic, physical, and human. These capitals are important resources for communities to successfully perform disaster phases' activities. A conceptual model based on disaster phases' activities and community capitals was developed in which indicators for measuring disaster resilience were identified. The model was utilized by first identifying activities relevant to each disaster phase and then specifically identifying indicators from each form of capital that might be important for carrying out those activities. The selected indicators were aggregated and a composite index score was calculated using average method which is based on equal weighting. The reliability and validity of the index were assessed using Cronbach's alpha, regression analysis, and GIS techniques. The results provided convincing empirical evidence that the index is a valid and reliable measure. The application of the measure indicated that disaster resilience is an important predictor of flood property damage and flood related deaths in the U.S. Gulf coast region. Also, the findings indicated that Florida counties are the most resilient whereas counties along the Texas-Mexico border region are the least resilient.

The interaction of tick species and the microclimate that they inhabit is a subject that is frequently studied. The known biology of the Gulf Coast tick, Amblyomma maculatum Koch (Acari: Ixodidae), was used to conduct analyses to determine which meteorological factors regulate Gulf Coast tick survivorship in an area of Texas that is known for reduced occurrence of this tick species. Gulf Coast tick collection records, that indicated the collection of a single tick or multiple ticks from one animal or multiple animals at livestock markets, were obtained from the Texas Animal Health Commission. These records were used as an indicator of adult Gulf Coast tick abundance during each year in the 90 county study area and were used as the dependent variable in linear, quadratic, and cubic regression analyses. Independent variables used in these analyses were precipitation and differing drought thresholds during the peak activity time of the four life stages of the Gulf Coast tick and during combined life stage peak activity times. Linear, quadratic, and cubic regression analyses to measure the effect of precipitation during differing peak activity times of the Gulf Coast tick on adult Gulf Coast tick collection records were not statistically significant. These three regression analyses were also used to measure the effect of increasing drought thresholds, measured using a Keetch-Byram Drought Index, on adult Gulf Coast tick collection records. A determination was made that increasing drought thresholds during the peak activity time of differing Gulf Coast tick life stages reduce the number of Gulf Coast tick collection records the following year.

The aggregation-attachment-pheromone (AAP) of two geographic strains of the Gulf Coast tick, Amblyomma maculatum Koch, was investigated to evaluate practicality of using solid-phase-microextraction (SPME) in an AAP study of Gulf Coast tick. Solid-phase microextraction was used to compare the AAP production in two strains of fed male Gulf Coast tick and demonstrate and confirm the presence of AAP in bioassays. A solid-phase-microextraction (SPME) headspace collection technique was sufficient to capture volatile organic compounds produced by fed and unfed male Gulf Coast ticks. Gas chromatography analysis revealed three major volatile organic compounds were produced in significantly greater amounts (p < 0.05) by fed males than those produced by unfed males. These volatile compounds were produced in significantly higher amount by the third day of feeding by male ticks. However, two of these volatiles remained relatively constant in their production while the primary volatile compound increased in its production until the eighth day of feeding by male Gulf Coast ticks. Also, the relative abundances of these three volatile organic compounds were different between Oklahoma and Texas strains of Gulf Coast ticks. The activity of AAP from fed male Gulf Coast ticks was confirmed using two bioassay techniques. A petri dish bioassay revealed significantly higher numbers of female Gulf Coast ticks attracted to fed-males which also produced significantly greater amounts (p < 0.001) of volatile organic compounds detected by GC analysis. The Ytube olfactometer bioassay revealed that significantly higher numbers of females responded to fed-males or to CO2 when compared to purified air (p < 0.001), but the differences in female response to fed-males and CO2 were not significant (p < 0.391 in Oklahoma strain and p < 0.458 in Texas strain). However, female responses to stimuli containing both fed-males and CO2 were significantly higher when compared to either stimulus alone (p < 0.001).

The Spanish Fort San José, located on the St. Joseph Peninsula, was occupied from 1719 until 1723. This site is significant as it preserves key details on Spanish settlement, trade, and ethnic diversity on the northern Gulf Coast and relationships with aboriginal and other European peoples of the region. The first archaeological testing of this site was conducted in the 1960s, but limited information exists on this work, and the fort's structural remains are now gone. My research examines a recently discovered artifact collection from this site and combines the new data with information from extant collections from Florida State University and the University of West Florida. The research aims first, to document the large body of materials from the site, then to provide new insights on the nature of this remote and short-lived colonial outpost and how this settlement compares in material culture and inferred social and economic behavior with other contemporaneous aboriginal and Spanish settlements, including Santa Maria de Galve in Pensacola, approximately 225 km (140 mi) to the west, and Mission San Luis de Talimali in Tallahassee, approximately 127 km (79 mi) to the east. My artifact analysis, coupled with description from historical documents, resulted in the determination that Fort San José was not simply an outpost but is actually very similar to Santa Maria de Galve and Fort San Luis at the Mission San Luis de Talimali in both function and the artifacts that were left behind. Fort San José was intended to be a strong Spanish presence in the Gulf Coast, as evidenced by the number of individuals living here, the interactions they had with other colonial powers, and the remarkable footprint they left in just four short years.

Estuarine wetlands and salt marshes are fundamentally driven by variations in freshwater inflow. In semi-arid salt marshes, such as the Nueces River Delta, TX, the stochastic nature of freshwater inflow events exposes resident organisms to a wide range of environmental conditions. In this study, we investigate (1) the relative importance of environmental variables on porewater salinity and (2) determination of freshwater inflow needs based on the response of emergent plants to salinity variations. Porewater salinity variations were tracked on a continuous basis with deployed conductivity sensors and on a synoptic basis with soil water extracts. We found that spatial patterns of porewater salinity were characterized by a high degree of variability in creekbank areas (23.8 ± 7.68) relative to interior marsh areas (44.2 ± 3.4). Our observations were used to test a simple model capable of predicting porewater salinities based on environmental variables. Both empirical measurements and model simulations indicated that semiannual tides play a critical role in controlling porewater flushing from precipitation and freshwater inflow events. Estimation of freshwater inflow needs for the Nueces Delta proceeded in two steps. First, we examined the response of three common emergent plants species (Borrichia frutescens, Spartina alterniflora, and Salicornia virginica) to variations in salinity. The abundance of one species in particular (S. alterniflora) was tightly coupled to salinity variations whereby salinities exceeding 25 ± 5 resulted in dramatic declines in coverage. Next, the relationship between freshwater inflow and porewater salinity was examined with respect to the salinity “tolerance” of S. alterniflora. Estimated inflow needs based on maintenance of substantial (> 20%) S. alterniflora coverage was comparable to both previous inflow needs estimates and mean annual inflows observed over the course of the study. The results of this study suggest that S. alterniflora abundance provides a reliable indicator of overall estuarine hydrological condition in the Nueces Delta. / text

Research in salt marshes dominated by the grass Sporobolus alterniflorus indicates that plant characteristics affect fiddler crab burrowing and in turn, crab activity can enhance primary productivity by increasing soil oxygen and nutrient cycling. Crab-plant interactions are less understood in microtidal Gulf Coast marshes compared to Atlantic Coast tidal marshes. It is unknown how structure of the dominant Gulf Coast vegetation zones (salt marsh, brackish marsh, fresh marsh and salt pannes) affects density of crab burrows and how burrows may influence primary productivity. I hypothesized that fiddler crabs would be most abundant in marsh zones with intermediate substrate hardness and vegetation density (Goldilocks Hypothesis). A seasonal habitat preference study was conducted during 2016-2017 in tidal marshes at Grand Bay National Estuarine Research Reserve in coastal Mississippi using burrow density as a proxy for crab abundance. Plant above- and below-ground biomass, burrow proximity to vegetation, and soil hardness were also surveyed as potential drivers of fiddler crab populations. The results indicated that fiddler crabs burrow in all four zones, but to varying degrees, and that burrow density was highest during autumn. The fresh marsh had the highest average density of burrows, as well as vegetation and soil parameters most representative of intermediate habitat, thereby supporting the “Goldilocks Hypothesis”. The brackish marsh also proved to be important fiddler crab habitat. Preferential fiddler crab usage of habitat upslope of salt marsh, e.g., fresh and brackish marsh, in Gulf Coast sites suggests that they may avoid immediate impacts of rising sea levels and possibly even migrate to higher ground if needed.

Studies of sea breeze have been done on coastline locations worldwide, but only a few have focused on the U.S. Gulf Coast. This area is frequently influenced by sea breeze events; therefore, it is important for meteorologists to determine where and when these systems will occur. The objectives of this study are to quantify sea breeze frequency along the Gulf Coast and define the associated environmental characteristics. The study is based on sea breeze development during synoptically benign days. From 1991 to 2010 a total of 1,255 days were classified as synoptically benign, with 161 of those days identified as a sea breeze day through analysis of clouds from Geostationary Operational Environmental Satellite (GOES) imagery. The average surface temperature was significantly different between sea breeze and non sea breeze days, but the average surface wind speed and direction were not significantly different making them poor descriptors of sea breeze environments.

The present study explores some of the materials native to the Texas Gulf Coast between Corpus Christi and Beaumont relative to their adaptability to weaving. The problem is three-fold: first, to collect and identify the indigenous materials which might prove suitable for weaving; second, to determine the range of uses which each might serve in a weaving program; and third, to test further each selected specimen by making a sample into a finished woven product.

This dissertation analyzes the basalt ground stone industry at the archaeological site of Tres Zapotes, Mexico. Artifacts and by-products were recovered in the excavations conducted by a University of Kentucky project directed by Christopher Pool. All contexts were examined, and the corpus of this study comprises the whole sequence of production, use, and discards of basalt such as by-products of manufacture, unfinished and finished tools, and discarded artifacts. In this opportunity was possible to study over time a change from the Early/Middle Formative period (Olmec occupation) a centralized and exclusionary political economic system to the Late/Terminal Formative period (Epi-Olmec occupation) when there was a corporate system. This work applied contemporary concepts in social sciences such as agency, practice theory, technological choice, and chaîne opératoire. The variation of raw materials over time was studied recoding physical characteristics and a sample of artifacts was analyzed with X-ray florescence in order to see variation in acquisition of rocks over time.