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	A Qualitative Research Study of How Extended Field Experience Prepares Special Education Teachers of Students with Emotional and Behavioral Disorders Date: 2005-05 Creator: Wang, Hsin-Yi Description: A well-prepared and qualified special education teacher is crucial to the performance of students with emotional and behavioral disorders (EBD). The prominent educators and federal government encourage the use of extended field experiences in preparing qualified special education teachers. The study examined the strengths and weaknesses of extended field experience in terms of the perceptions of the prospective teachers and teachers of students with EBD. Both individual interviews and a focus group were used to collect data. The results revealed that extended field experience benefits prospective teachers in showing the reality of the teachers' world, self-motivation assessment, and professional development. However, there were some improvements that could be made, including more placement selections and more practical knowledge. > more info

	Evaluation of City of Denton Sub-Watershed by Benthic Macroinvertebrate Field Experimental Approach Date: 2006-08 Creator: Mahato, Mahendra Description: In this study, two different field experiments were designed to assess the relative influence of urbanization on benthic communities. During spring and summer, four urban and one reference sites from Denton County, Texas were selected for benthic macroinvertebrate evaluation. Statistically significant differences in colonized benthic macroinvertebrate taxa on artificial substrates were observed among the four urban sites and the reference site. Oligochaetes and chironomids were the dominant taxa at all sites. Identification of chironomid larvae at the subfamily and genus level to detect differences between sites had higher statistical power than the evaluation based on total chironomids. At the reference site, Caenis, Cladotanytarsus, Orthocladius, and Ceratopogonidae were the dominant taxa, while the urban sites were dominated by Dero, Physella, Ancylidae, Chironomus, Dicrotendipes, Glyptotendipes, Polypedilum, Pseudochironomus, Stenochironomus, and Tanytarsus. These differences may have been dependent upon differences in hydrologic regime and water quality between sites. Significant differences (ANOVA, p < 0.01) in water quality parameters (alkalinity, hardness, nitrates, phosphates, chlorides, sulfates, calcium, magnesium, potassium, and triazine) were found among water samples collected from the reference and urban sites. During the transfer period, most of the Ephemeroptera and Trichoptera taxa and a few other taxa disappeared from artificial substrates that were colonized at the reference site and then moved to the urban sites. Also, local abundant taxa from the urban site significantly (t test, p < 0.05) increased in number on the transferred artificial substrates. Seasonal differences in colonization patterns were also observed between the spring and summer experimental periods, which indicate that temporal variation is equally important, as is the anthropogenic effect in benthic community evaluation. Field survival and growth experiments using Erpetogomphus designatus larvae were designed to detect differences between evaluated sites. Larvae were collected from the reference site, measured in the laboratory, and exposed at the urban sites for six weeks in using specially designed cages. The exposed larvae demonstrated a higher mortality rate at the urban sites compared to the reference site. > more info \| Use restricted to UNT community