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Articles 1 - 7 of 7
Full-Text Articles in Life Sciences
Morphological, Genetic, And Environmental Characterization Of An Unusual Population Of Isoetes (Isoetaceae, Lycopodiophyta), Shannon L. Walker
Morphological, Genetic, And Environmental Characterization Of An Unusual Population Of Isoetes (Isoetaceae, Lycopodiophyta), Shannon L. Walker
Honors Theses
A large and unusual population of Isoetes (Isoetaceae, Lycopodiophyta) in the DeSoto National Forest, Wayne County, Mississippi, was studied to determine if the individuals there represent a new species or if they represent part of the variation of the one primary species of the longleaf pine belt of Mississippi, Isoetes louisianensis, which it most closely resembles. The unusual population and specimens of known Isoetes louisianensis were examined comparatively based on morphology, megaspore ornamentation, examination of habitat characteristics, and phylogenetic analysis of DNA sequence data from the nuclear internal transcribed spacer 1 and 2 (ITS) and the 5.8S ribosomal gene. No …
Salinity Tolerance Of Gambusia Affinis, Sarah Rubelowsky
Salinity Tolerance Of Gambusia Affinis, Sarah Rubelowsky
Honors Theses
Developmental plasticity refers to changes during development as a result of environmental contributions. Salinity is a varying environmental condition in freshwater and estuarine habitats that can mediate developmental plasticity in Gambusia affinis, which can increase their tolerances as an invasive species. For my study, estuarine and freshwater populations of Gambusia affinis were sampled in March of 2017 using dip nets. Both populations were then brought back to the laboratory where pregnant females were acclimated to three different salinities (0‰, 15‰, 25‰) until they gave birth. I predicted that the estuarine population of Gambusia affinis would have a greater salinity tolerance …
Color Vision And Signal Color Evolution In Anolis Lizards, Catherine S. Wadman
Color Vision And Signal Color Evolution In Anolis Lizards, Catherine S. Wadman
Honors Theses
Anolis is a diverse genus of small arboreal lizards that utilize a visual communication system using a colorful expandable throat-fan (dewlap). They signal either to attract females or repel males. The environment the lizard lives in has influenced the coloring of these dewlaps. Species that occupy shaded habitats tend to have yellow dewlaps while those that inhabit brighter habitats tend to have red dewlaps. In experiment 1 we used a color perception assay to test whether a red or yellow stimulus against a green background was more visible to the lizard under different light intensities mimicking a dewlap appearing in …
Investigating The Relationship Between Invasive Garlic Mustard Alliaria Petiolata And Blacklegged Ticks Ixodes Scapularis, Nicole Shauffer
Investigating The Relationship Between Invasive Garlic Mustard Alliaria Petiolata And Blacklegged Ticks Ixodes Scapularis, Nicole Shauffer
Honors Theses
Garlic mustard Alliaria petiolata is an invasive herb that has been studied for its chemical allelopathy ability to hinder plant growth of its competitors and potential to inhibit entomopathogenic fungi. It has been suggested that these fungi which infect and kill insects and arthropods like blacklegged ticks Ixodes scapularis may be negatively impacted by garlic mustard presence. This study investigated the potential relationship between garlic mustard and blacklegged tick populations through two experiments. One experiment measured the effect of garlic mustard soil and leaf extract on waxworm survival where waxworms were used as a bioassay for the presence of fungi. …
Lacuna: Transcendence Of The Human Body Through The Space Between, Anica Bottom
Lacuna: Transcendence Of The Human Body Through The Space Between, Anica Bottom
Honors Theses
This essay examines the author’s choreography, Lacuna, and research integral to its representation. During the choreographic process, experimentation of how the human body moves in relation to different architectural space was observed. In collaboration with the cast of dancers, cohesion of personal experiences in particular locations was evaluated: specifically, investigation of how environments has the ability to trigger habits or patterns of movement from both past and present experiences. A closer look at how the body responds on a visceral level to the physical and emotional sense of place is described. Although the choreographic piece, Lacuna, came to …
Effects Of Temperature Gradient, Substrate Composition, And Canopy Cover On The Spatial Distribution Of Topminnow Species: Fundulus Notatus And Fundulus Olivaceus, Austin M. King
Honors Theses
Hybrid zones are locations where two interbreeding species coexist and hybridize. The spatial distribution of ecologically similar species is of primary interest in understanding the formation and stability of hybrid zones. These hybrid zones are of significance as they allow for insight into how speciation occurs naturally within the environment. A variety of factors may play a role in determining the spatial distributions of species within hybrid zones. Examples of these factors include variations in temperature gradients, substrate composition, and changes in canopy cover. Fundulus olivaceus and Fundulus notatus are generally found within upstream and downstream habitats respectfully. These habitats …
Phylogenetic Relationships Of The Genera Of Achariaceae Based On Analyses Of Morphological And Dna Data, Corey L. Pagart
Phylogenetic Relationships Of The Genera Of Achariaceae Based On Analyses Of Morphological And Dna Data, Corey L. Pagart
Honors Theses
Achariaceae are a mostly tropical family of flowering plants consisting of about 29 genera and 150 species of trees and shrubs. Although they are closely related to passionflowers (Passifloraceae), violets (Violaceae), and willows and cottonwoods (Salicaceae), phylogenetic relationships of the genera remain unclear because the only studies have been focused on particular genera or had limited sampling. Few studies of the family in general have been conducted, except for some on species that produce chaulmoogra oil, a commonly used historical treatment for leprosy. For my study, I investigated the relationships of the genera within the family using morphological and molecular …