Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Taxonomic group"”.
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Evolution of the mysRS element in the genome of rodent species
… families apparently restricted to a specific taxonomic group of rodents. By analyzing the genomes of various cricetid rodents, our results provide evidence that the mysRS element originated in either an ancestor of the Neotominae subfamily or the Reithrodontomini tribe of rodents, which …
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Phylogenetic Study of Apocynaceae Juss. And Aspidosperma Mart. And Zucc
… part of the systematic analysis of this taxonomic group used morphological and molecular characters. The morphological data was similar to that used for PCA, and the molecular sequence data was from both the nuclear genome (ITS-1 and ITS-2) and the chloroplast genome (trnL intron and …
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Bird Strike Risk Assessment for United States Air Force Airfields and Aircraft
… more numerous. Aircraft speed, phase of flight, taxonomic group, bird mass and aircraft group were the strongest predictors of damaging bird strikes. Bird strike rates were calculated for USAF aircraft and selected USAF airfields. Bomber aircraft had the highest strike rate; these aircraft …
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Discovery of Novel Neurologically Active Phytochemicals in Neotropical Piperaceae: An Ethnopharmacological Approach
… Piperaceae, among others, as an important taxonomic group for the treatment of such disorders. Following that lead, a botanical survey was conducted in Peru, where 47 species of Piperaceae and 21 plants traditionally used for folk illnesses by the Yanesha of Peru, an Amazonian ethnic group, …
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The Locations and Drivers of Herpetofaunal Wildlife Road Mortality on Two Highways within the Frontenac Arch, Ontario
… in this area. Kernel density analysis for the taxonomic groupings included in this research showed that road mortality was not random along the roads and there was spatial clustering in the form of hotspots. The hotspots of every taxonomic group overlapped in the middle of Highway 2, while …
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The Restorative Potential of Public Aquariums: Psychological and Physiological Effects of Viewing Sub-Aquatic Environments
… level of species richness and abundance, and taxonomic group. Study 4 examined behavioural, physiological and psychological responses to one aquarium exhibit during three stages of restocking. Finally, to establish how perceptions of species richness and abundance influenced well-being …
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An investigation of character variation in Chaetobromus Nees (Danthonieae: Poaceae) in relation to taxonomic and ecological pattern
… was used to derive a classification reflecting taxonomic and ecological pattern. The present study differs from earlier biosystematic investigations by its much more intensive approach to sampling, with 75 anatomical, morphological and cytological characters and 169 individual samples being …
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Assessing species richness patterns and conservation threats (due to overharvesting and climate change) in South African Cycads, with emphasis on a population of Encephalartos tranvenosus Stapf and Burt Davy from the Soutpansberg Mountain, Limpopo Province
… the awareness of the existence of this plant group, they have been facing high extinction risk. Currently they are referred to as the most threatened plant group in the world. Many ecological and anthropological forces are promoting extinction crisis of this taxonomic group. Africa is one of …
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Neural Network Techniques for the Identification and Classification Marine Phytoplankton from Flow Cytometric Data
… some species and their respective morphological groupings. In an attempt to improve identification to taxonomic group or genus level by supervised networks, class labels more reflective of flow cytometric signatures must be<br/>introduced. Methods for boundary recognition and cluster distinction …
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Characterizing Wetland Hydrology, Chemistry, And Soils For An Endemic Crayfish, The Piedmont Blue Burrower
… crayfish ranking as the second most imperiled taxonomic group in North America. Primary burrowers represent only 15% of crayfish species in North America; however, they constitute 32% of imperiled crayfish. Despite their conservation importance, little is known about the ecology of burrowing …
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Marine Bioinvasions in Anthropogenic and Natural Habitats: an Investigation of Nonindigenous Ascidians in British Columbia
… nonindigenous species (NIS) spanning several taxonomic groups and geographical regions. Second, I conducted systematic subtidal surveys in anthropogenic and natural habitats and investigated the distribution of nonindigenous ascidians on Southern Vancouver Island, British Columbia, Canada. …
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Effects of climate change on mammalian fauna composition and structure during the advent of North American continental glaciation in the Pliocene
… is not currently possible. Selected mammalian groups, carnivorans, insectivorans, and leporids, were examined in light of the established climatic patterns. The cooling through the lower portion of the Glenns Ferry Formation corresponds to variation in the morphology of individual species, the …
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Phytoplankton Response to South Louisiana Crude Oil Exposure: Determining Impacts at Individual, Community, Toxin Production, Enzymatic-Activity and Gene-Expression Levels
… size influenced tolerance to crude oil, but taxonomic group seemed to be a more predominant criterion. In general, diatoms showed better tolerance to crude oil than dinoflagellates. Naphthalene and benzo(a)pyrene cannot be solely used as surrogates to assess crude oil toxicity on …
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Revision of the tribe Serrolecaniini Shinji (Pseudococcidae) with discussion on other "legless" mealybugs
… 63 species are often separated into their own taxonomic group based on these vestigial features (e.g., Sphaerococcinae), and are collectively known as the "legless" mealybugs. A comparative morphological analysis of adult females was undertaken to clarify the taxonomic placement of these …
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Understanding predation of tortoises by nesting Pied Crows (Corvus albus) in western South Africa
Many species in a wide variety of taxonomic groups have shown shifts in their distribution ranges in recent decades. Rapidly changing distributions may lead to novel biotic interactions between species that have not historically interacted. As generalist predators, corvids are a potential threat to …
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The Effect of Population History on Hominoid Intraspecific Cranial Shape Diversity: Combining Population Genetic and 3D Geometric Morphometric Data
… or fluctuations in population size. For each taxonomic group in this study, genetic diversity and the effective population size (Ne) are compared with cranial shape diversity to determine the strength of the relationship between these two data-types. 3D cranial landmark data are divided into …
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Nuclear Localization of Proteins and Genome Editing in the Oomycete Phytophthora sojae
… (indeed they were incorrectly placed in the same taxonomic group until recently), a special section reviews the emerging genome editing technology CRISPR/Cas system in these organisms together. Chapter 2 and Chapter 3 focus on one of the most important intracellular activities, nuclear …
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Examining the Impacts of Valley Fills in Stream Ecosystems on Amphibian and Aquatic Insect Communities in Southeastern Kentucky
… Past studies have focused on generally one taxonomic group or purely habitat and water quality affects. In this study we evaluated stream salamander and aquatic insect communities, metal concentrations in water and tissue, and stream quality and habitat in 10 streams affected by Valley fills …
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Mechanistic underpinnings of lacustrine brGDGT production, and proteomic vertebrate taxonomic identification of phrynosomatid lizards and arvicoline rodents
… derived from bacteria; 2) The viability of taxonomic identification of North American lizards using proteomic analysis of the collagen (I) (COL1) protein in bone, and this method’s ability to test the accuracy of morphological identifications that are the basis of hypothesized lizard …
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Behavioural, mensural, and ecological correlates of polygyny in the eastern meadowlark (Sturnella magna)
… from each territory and sorted according to taxonomic group and size. During 1983, territory attributes were sampled twice, once early and once later in the nesting season. Analysis of data involved univariate comparisons between monogamous and polygynous males using T-tests and multivariate …
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