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 28 for “"Asexual reproduction"”.
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The effects of heavy metals on the asexual reproduction of the annelid Aeolosoma headleyi Beddard (1888)
… to determine the effects of heavy metals on asexual reproduction. Bioassays were conducted with the chloride and sulfate salts of zinc, copper, cadmium, cobalt, and nickel. Additionally, chromium, as potassium dichromate, was tested. Of these metals, only two, zinc chloride and copper …
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The Role That Asexual Reproduction Plays in the Regeneration of Tropical Piper Shrubs: Habitat Differences and Genetic Consequences
Asexual reproduction is a common, but little explored characteristic of many tropical plants with a variety of life-histories and habitat requirements. My dissertation research examined the ecological correlates and population genetic consequences of asexual reproductive success in five …
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Genomic evidence of long-term asexuality at the northern range limit of wetland plant, Decodon verticillatus (Lythraceae)
Many plant species shift from sexual to asexual reproduction at geographic range edges, but the impact of asexual reproduction on range expansion is largely unknown. If asexuality allows genotypes well-adapted to range edge conditions to persist long-term without recombination, this may allow plant …
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Mechanisms of axial polarity modification during postembryonic development of the basal bilaterian Convolutriloba macropyga
<p>Acoel flatworms have varied modes of asexual reproduction that involve dramatic postembryonic modification of their anterior-posterior (AP) axis. The acoel species <em>Convolutriloba macropyga</em> reproduces through a reversed polarity budding process in which offspring develop from two …
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SEX AND DIVERSITY IN THE INVASIVE PLANT HIERACIUM AURANTIACUM
Sexual reproduction is generally thought to provide long-term fitness advantages over asexual reproduction in the form of increased genetic diversity. Some work, however, suggests that asexual reproduction can also be advantageous. One situation when asexual reproduction provides an advantage is …
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SEX AND DIVERSITY IN THE INVASIVE PLANT HIERACIUM AURANTIACUM
Sexual reproduction is generally thought to provide long-term fitness advantages over asexual reproduction in the form of increased genetic diversity. Some work, however, suggests that asexual reproduction can also be advantageous. One situation when asexual reproduction provides an advantage is …
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Biologia reprodutiva e estrutura de duas populações de Coscinasterias tenuispina (Lamarck, 1816) (Echinodermata: Asteroidea) na região do Cabo Frio, Rio de Janeiro
Sexual and asexual reproduction of the fissiparous asteroid Coscinasterias tenuispina were studied in two populations at Cabo Frio region, Rio de Janeiro, from August 1999 to December 2000. One population occurs on subtidal region at Prainha, Arraial do Cabo, and the other occurs on intertidal …
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Genetic variability and differentiation in niche components of marine phytoplankton species
The acclimated asexual reproduction rates of many clones of Emiliania huxleyi (82), Gephrocapsa oceanica (19), Cyclococcolithina leptopora (31), Prorocentrum micans (28), Dissodinium lunula (22), Thoracosphaera heimi (20), and Gonyaulax tamarensis (83) were measured in several light and temperature …
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How Clonal Ants Clone: The Reproductive Biology of the Clonal Raider Ant, Ooceraca Biroi
… change is affected by the mechanics of reproduction, including the number of copies of each chromosome an organism has (ploidy), whether the organism reproduces sexually or asexually, and how gametes are produced. Disentangling the rules of reproduction is therefore vital to …
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DDRAD-seq based identification of genetic markers to facilitate the assessment of clonal versus sexual reproduction in dichrostachys cinerea
… via seed dispersal, the species is capable of asexual reproduction via the process of root suckering. D. cinerea can aggressively colonize grasslands and quickly becomes problematic given its ability to persist through treatments such as fire, chemical treatment and mechanical removal. Due to …
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Population Genetic Structure of the Temperate Scleractinian Coral, Oculina Arbuscula, in Coastal Georgia
… arbuscula's branching morphology is conducive to asexual reproduction by fragmentation. To address this hypothesis, I combined data from allozyme electrophoresis, histocompatibility assays, and despersion of established colonies. Results indicated substantial local recruitment maintained primarily …
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Postembryonic Polarity Modification in the Acoel Convolutriloba longifissura
… body axes during regeneration and asexual reproduction, the acoel flatworm <em>Convolutriloba longifissura</em> is unusual in its ability to modify left-right (L-R) axis polarity during longitudinal fission. We have developed <em>C. longifissura</em> as a model for studying the …
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Genetic diversity and population structure of Vaccinium vitis-idaea
… clonal. This is because in species capable of asexual reproduction, it is necessary to first differentiate between clonal ramets and unique genets before measuring genetic diversity. We assessed the clonal structure and genetic diversity in wild populations of lingonberry (Vaccinium …
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Evolution of reproductive mode in the scaly-winged bark louse Echmepteryx hageni
The origin and maintenance of sexual reproduction has long been of interest to evolutionary biologists. While the relationship between genetic diversity and asexuality has received recent attention, the precise nature of this relationship is dependent on the physiological mechanism (e.g. automixis …
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Investigating the role of the Apicoplast in Plasmodium falciparum Gametocyte Stages
… intraerythrocytic ring stage parasites leave asexual reproduction and develop into gametocytes. A mosquito vector will ingest mature gametocytes during a blood meal. Sexual reproduction will occur in the midgut, leading to the production of sporozoites that will migrate to the salivary gland. …
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Žarnyno Sarcocystis infekcijos paplitimas rudosiose lapėse (Vulpes vulpes) /
… tissue and CNS of the intermediate host by asexual reproduction. Sporocysts are formed in the intestines of the definitive host by sexual reproduction. There is a lot of research made in the world about Sarcocystis genus, however there is not enough analysis in Lithuania about these …
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Floral traits and pollination of Solidago altissima: mechanisms of local adaptation among and within biomes
… influenced by the trade-off between sexual and asexual reproduction. Floral traits can evolve rapidly, and this often occurs in response to interactions with pollinators. I found differences in floral traits between plants from the two biomes, and these differences strongly affected pollinator …
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Homeostasis and volume regulation in the Plasmodium falciparum infected red blood cell
… their integrity for the duration of the parasite asexual reproduction cycle. The volume and shape changes of infected cells were measured and characterized at femtolitre resolution throughout the intraerythrocytic cycle using confocal microscopy. Fluorescence lifetime imaging and electron probe …
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On the life history, systematics and ecology of Ruppia maritima L. (Potamogetonaceae) in lower Chesapeake Bay
… because it utilized a combination of sexual and asexual reproduction. Ruppia maritima colonized plots by rapid rhizome growth. Seed reserves were probably more important in re-establishing populations than in "maintenance" of populations. Ruppia produces energy costly Post-reproductive shoots. …
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Evolutionary computing techniques to aid the acquisition and analysis of nuclear magnetic resonance data
… candidate solutions to be modified by sexual and asexual reproduction and mutation to come closer to solving the problem in question without the necessity of having prior knowledge of what a good solution looks like. The increasing importance of Nuclear Magnetic Resonance Spectroscopy in medicine …
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