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 20 for “"COI gene"”.
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Host-parasite cophylogeny and rates of evolution in two rodent-louse assemblages
… pattern of cophylogeny. Both host groups are generally solitary organisms and both louse groups are obligate ectoparasites, often exhibiting extreme degrees of host specificity. This intimate and potentially long-term association likely has resulted in coevolutionary adaptations and counter …
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Genetic And Morphological Assessment Of Pigtoe Mussels (unionidae: Pleurobemini: Fusconaia/pleurobema Spp.) in Ozark Drainages
… within the Pleurobemini. Molecular phylogenetic work has revealed multiple problems within currently accepted Pleurobemini classifications. Specifically, Fusconaia has been shown to harbor cryptic diversity within drainages of the Ozarks. Further, Pleurobema rubrum and P. sintoxia have …
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Sample Collection and DNA Extraction Methods for Environmental DNA Metabarcoding in Headwater Streams
… subunit 18 S (18s) and the cytochrome oxidase I (COI) gene regions. The 18s sequence data is non-reportable due to lack of sequence quality, and MoBio's PowerWater did not yield DNA suitable concentrations. CTAB and DNeasy extractions yielded successful PCR reactions and high-throughput sequencing …
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Phylogenetic Relationships of Tick Species in the <em>Ixodes ricinus</em> Complex, Derived from Mitochondrial Coi and 16S Genes
… The aim of this study was to investigate phylogenetic relationships among species of the <em>Ixodes</em> <em>ricinus</em> complex worldwide using nucleotide sequences from mitochondrial cytochrome oxidase subunit I (mtDNA COI), and mitochondrial (mt) 16S genes. Ten species from the complex were …
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Molecular Phylogenetic Relationships of North American Dermacentor Ticks Using Mitochondrial Gene Sequences
… largely unresolved. This study focuses on phylogenetic relationships of the eight North American Nearctic <em>Dermacentor </em>species: <em>D. albipictus, D. variabilis, D. occidentalis, D. halli, D. parumapertus, D. hunteri, </em>and <em>D. andersoni</em>, and the recently re-established …
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Faunal biogeography, community structure, and genetic connectivity of North Atlantic seamounts
… broad community patterns were discernible at a genetic level, the 16S mtDNA gene was utilized as a genetic "barcode" within the Class Ophiuroidea, through which 22 putative species were identified, including four target species (Asteroschema clavigera, Ophiocreas oedipus, Ophioplinthaca …
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An investigation of genetic heterogeneity in a biological sentinel species (Lumbricus rubellus)
… the existence of several possible sources of genetic heterogeneity within the sentinel species Lumbricus rubellus that could compromise its suitability for ecotoxicological assessment. The species appears to consist of two genetically divergent cryptic lineages and has been demonstrated to …
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A preliminary integrated-taxonomic review of a staphylinid genus (Anotylus Thomson 1859) of the Ãrea de Conservacion Guanacaste, Costa Rica.
… utilising simple morphometric characters and the COI gene, I identified five distinct Evolutionary Significant Units (ESUs). With only two species of Anotylus formally identified in Costa Rica this presents a significant increase in the believed biodiversity of the genus within the region. This …
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Identification of Species in Ground Meat Products Sold on the U.S. Commercial Market Using DNA-Based Methods
… barcoding of the cytochrome c oxidase subunit I (COI) gene. The resulting sequences were identified at the species level using the Barcode of Life Database (BOLD). Any samples that failed DNA barcoding went through repeat extraction and sequencing. Due to the possibility of a species mixture, …
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Population genetics of the endemic red-chested sea cucumber, Hemiocnus insolens, along the southern coastline of Africa
… and metagenomic sequencing to analyse their phylogenetic and associated community structure to delimit whether the colour variations of H. insolens are a single species or a possible species complex. DNA was extracted from tissue of whole preserved (99% ethanol AR) samples and were sequenced for …
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Faunal biogeography, community structure, and genetic connectivity of North Atlantic seamounts
… broad community patterns were discernible at a genetic level, the 16S mtDNA gene was utilized as a genetic “barcode” within the Class Ophiuroidea, through which 22 putative species were identified, including four target species (Asteroschema clavigera, Ophiocreas oedipus, Ophioplinthaca …
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Macrogeographic Genetic Structure in Acanthephyra curtirostris (Oplophoridae)
… species long assumed to be widespread and genetically undifferentiated across their species range. Recently, however, data from sensitive DNA-based molecular markers has shown that many cryptic species exist in the sea and that marine zooplankton species may be more genetically structured …
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Distribution and phylogenetic inference within the flightless spring katydids (Tettigoniidae: Brinckiella Chopard, 1955) in the Greater Cape Floristic Region
… aimed to investigate the distribution and phylogenetic inference within the genus Brinckiella, map the distribution of its species, delimit the species through taxonomy and genetics, and elucidate the phylogenetic relationship and divergence time within the genus. Specimens were collected by …
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MATING COSTS, MALE CHOICE DISPLACEMENT, AND THE EFFECTS ON HYBRIDIZATION AND SPECIATION IN THE HAWAIIAN CRICKET LAUPALA (SUBFAMILY:TRIGONIDIINAE)
… alternatives will occur depends on the degree of genetic differentiation and behavioral isolation between the species. If there is significant and non-combinable genetic variation between species, but behavioral isolation between the two incipient taxa is incomplete and allows hybrid offspring to …
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Phenotypic and Genetic Diversity in the Sea Urchin Lytechinus Variegatus
… dissertation examined the geographic and genetic variability of color patterns and morphology of the sea urchin <italic>Lytechinus variegatus </italic>. This study had 3 objectives: 1) to describe and quantify phenotypic diversity--color and morphology--throughout the geographic range; 2) …
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Confirming the status of Lancashire’s endemic freshwater Nemertean – Prostoma jenningsi
… that can be used for diagnosis of species, genera or even family, thus making taxonomy difficult. Therefore, doubt surrounds existing species descriptions and their relationships. In 2011, researchers at the University of Central Lancashire (UCLAN) (including the author) initiated a project …
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Molecular and Field Analyses of Bathyplectes spp. (Hymenoptera: Ichneumonidae) in Alfalfa Systems in Virginia
… of both species are morphologically similar, generally described as wasps ≈3-4 mm long with black, robust bodies. The Bathyplectes spp. occupy sympatric ranges throughout much of the United States and often coexist within alfalfa fields. In Virginia, B. anurus is the primary biological control …
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Exploitation of underexplored physiological, metabarcoding and evolutionary aspects to enhance invasive insect pest management
… such as freezing. It is well known that, in general, bacterial microbiota can shift due to severe and prolonged conditions, but I find out that this is not the case for H. halys. Thus, targeting the bacterial microbiota could be a key factor for the management of this species. Moreover, I …
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Dichlorodiphenyltricholorethane (DDT) resistance mechanisms in Drosophila melanogaster and applications for the cowpea pest Clavigralla tomentosicollis
… programs are necessary. The arrival of next-generation sequencing (NGS) and lowered sequencing costs provides the tools for elucidating how insects evolve resistance to pesticides and the opportunity for developing molecular markers to characterize pest populations and their dynamics. One …