Matching Items (2)
Description
Through the months September-November of 2017 a study was conducted to determine if bees prefer the sunflower, Helianthus annuus, native to Arizona, or a cultivar Helianthus sunflower in an urban environment. The study was executed in a small, controlled urban environment on Arizona State University West campus. Seven identified bee species and forty-nine specimens were collected, of the forty-nine specimens, two bees were reported on the Helianthus cultivar supporting native floral host preferences of native species. Variables such as nectar, pollen, floral color, and floral height were not measured, however, when the floral host genus was maintained wild bees visited the native Helianthus host significantly more yielding a supportive two-tailed p-value of 2.97x10-5. Three trends were identified in correlation with the experiment: 1) Bees foraged on native Helianthus annuus over the Helianthus cultivar, 2) Generalist species were more abundant than specialists on the Helianthus annuus, 3) Honey bees (Apis mellifera) were the most abundant species present. While not considered a trend, low floral diversity and abundance may explain the low diversity of bee species observed on the Helianthus. Floral host and pollinator desynchronization may also have affected bee diversity and abundance. Analysis of bee abundance and diversity support that wild bees may prefer native floral hosts over cultivar floral hosts when the floral genus, temperature, and time was controlled for in an urban environment.
ContributorsDunham, Jocelen Michaela (Author) / Foltz-Sweat, Jennifer (Thesis director) / Sweat, Ken (Committee member) / School of Mathematical and Natural Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-12
Description
ABSTRACT Genomes are biologically complex entities where an alteration in structure can yield no effect, or have a devastating effect on many pathways. Most of the focus has been on translocations that generate fusion proteins. However, this is only one of many outcomes. Recent work suggests alterations in topologically associated domains (TADs) can lead to changes in gene expression. It is hypothesized that alterations in genome structure can disrupt TADs leading to an alteration in the variability of gene expression within the contained gene expression neighborhood defined by the TAD. To test this hypothesis, variability of gene expression for genes contained within TADs between 37 cancer cell lines from the NCI-60 cell line panel was compared with normal expression data for the corresponding tissues of origin. Those results were correlated with the data on structural events within the NCI-60 cell lines that would disrupt a TAD. It was observed that 2.4% of the TADs displayed altered variance in gene expression when comparing cancer to normal tissue. Using array CGH data from the cancer cell lines to map breakpoints within TADS, it was discovered that altered variance is always associated with a TAD disrupted by a breakpoint, but a breakpoint within a TAD does not always lead to altered variance. TADs with altered variance in gene expression were no different in size than those without altered variance. There is evidence of recurrent pan-cancer alteration in variance for eleven genes within two TADs on two chromosomes (Chromosome 10 & 19) for all 37 cell lines. The genes located within these TADs are enriched in pathways related to RNA processing. This study supports altered variance as a signal of a breakpoint with a functional consequence.
ContributorsDunham, Jocelen Michaela (Author) / Kanthaswamy, Sreethan (Thesis advisor) / Mancenido, Michelle (Thesis advisor) / Bussey, Kimberly J. (Committee member) / Arizona State University (Publisher)
Created2022