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 38 for “"host-parasite interactions"”.
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Host-Parasite Interactions Within Food Webs
… employed in nature, yet the effects of parasites are often thought to be minimal, and the vast majority of studies fail to consider parasites and their effects on host organisms. This is likely a problem, as the magnitude of parasite-mediated effects on their hosts can be quite large. …
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Larval trematode populations and host-parasite interactions in Cerithidea Californica
<p>Cerithidea california is examined to determine the fecundity of the parasitic trematode species in its gonad. Five species of trematodes are studied (Cloacitrema michiganensis, Euhaplorchis californiensis, Parorchis acanthus, Himasthia rhigedana, and Acanthoraryphium sp.). Their fecundity is …
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Predators alter host-parasite interactions via trait-mediated indirect effects
… directly interact with their prey. These direct interactions can indirectly alter the interactions between prey and other community members. For example, predators can alter prey life history, behavior, or morphology resulting in an indirect change in the interaction between their prey and …
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Host-parasite interactions of barley yellow dwarf virus and oats: Physiological and immunological studies
… yellow dwarf virus (BYDV) is restricted in its host to phloem tissue, and phloem blockage leads to the accumulation of photosynthate in the foliage. Diagnosis of the disease usually entails virus detection with strain-specific antibodies. Fourteen virus-specific monoclonal cell lines secreting …
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Some aspects of the biology and host-parasite interactions of Isospora spp. (Protozoa: Coccidiida) of passerine birds
In wild bird populations parasites are at least as important as predators. The subject of this work was Isospora, a genus of intestinal coccidia that has been rarely studied in passerine birds. We established a method of estimating the intensity of Isospora infection and showed diurnal periodicity …
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Host-parasite interactions between the cysticercoid larvae of the cestode Microsomacanthus hopkinsi and the amphipod intermediate host Hyalella azteca
This study examined host-parasite relations between cysticercoids of Microsomacanthus hopkinsi and the amphipod intermediate host Hyalella azteca throughout the latter's life history. There was a significant positive relationship in oncosphere consumption, parasite loads, and short-term survival in …
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Host-Parasite Interactions of the Soybean Cyst Nematode and Snap Beans Compared to Soybeans (Phaseolus Vulgaris, Heterodera Glycines, Max, Resistance, Temperature)
… (SCN), (Heterodera glycines), a devastating parasite of soybean (Glycine max), was recently reported as damaging snap bean (Phaseolus vulgaris) in an Illinois commercial snap bean field. Because little information concerning the host-parasite relations of snap bean and SCN exists, studies …
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Giardia Cathepsins and Their Role in Intestinal Disease
Giardia duodenalis, a non-invasive protozoan parasite of the upper small intestine of mammals, including humans, closely associates with intestinal epithelial cells. The pathophysiology of giardiasis includes intestinal barrier dysfunction and cytoskeletal injury; however, the mechanisms or …
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Exploring the interactions between schistosome eggs and the human host
… associated with schistosomiasis develops. Host-parasite interactions are important in disease progression and pathology; Schistosoma parasites utilise host-derived signals as developmental cues, and schistosomiasis pathology develops largely as a result of the host response to worm- and …
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Habitat variation effects on cavity-nesting bee fitness, community assemblages, and parasite interactions in the Colorado Front Range
… ability, reproduction and brood development, parasite abundance, and community network metrics. This was done by deploying artificial nesting boxes in the ponderosa pine forest of Boulder County, CO that either burned at higher severity, thinned by hand, or were unburned and untreated control. …
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Population Genetics Analysis of the Grass Shrimp Palaemonetes Pugio Using Single Strand Conformation Polymorphism
… pugio, populations or the effects the parasite Microphallus turgidus has on it. The objective of this study was to determine the amount of genetic diversity of the shrimp populations based on locality and parasite load. In order to examine the genetics of P. pugio, shrimp DNA was …
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Untangling the coevolutionary history between doves and their parasitic lice
In host-parasite systems, any given host species can be associated with multiple types of parasites, each of which can have a unique ecological relationship with the host. However, it remains unclear how these ecological differences link to evolutionary patterns. What shapes the dynamics of a …
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Response of Stomoxys calcitrans and Musca domestica (Diptera: Muscidae) to Volatile Organic Compound Profiles from Ontario, Canada Dairy Farms
… potential semiochemical targets that impact host-parasite interactions, at livestock facilities, can give insight in creating novel integrated pest management (IPM) approaches. We have sampled Volatile Organic Compounds (VOCs) at dairy farms in Southern Ontario, to determine important …
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Interrogating Host-Parasite Dynamics During Plasmodium Liver Stage Infection
… health burden and is caused by the apicomplexan parasite Plasmodium. Plasmodium spp. are transmitted by an Anopheles mosquito and require both host and vector to complete their life cycle. Once in the host, parasites travel to the liver and undergo an obligatory and asymptomatic liver stage. This …
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Molecular Interactions between Apicomplexan Parasites and their Host Cells
… A notorious case is that of Plasmodium parasites, the causative agents of malaria and one of the most ancient and devastating diseases known to humankind. Prior to infecting red blood cells resulting in the symptomatic stage of infection, Plasmodium parasites infect liver cells and …
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Investigating trophic interactions between parasites and their marine fish hosts using stable isotope analysis
… to be more parasitic than free-living organisms, parasites have been largely neglected from ecological studies and we have a relatively limited understanding of their trophic ecology. Hence, in order to incorporate parasites into food-web models and ecological studies, basic trophic interactions …
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Trojan horses in the marine realm: characterizing protistan parasite ecology in coastal waters
… signatures have highlighted the fact that parasites belonging to the marine alveolate order Syndiniales are both abundant and ubiquitous in coastal and open ocean environments, suggesting a major role for this taxon in marine food webs. Two coastal sites, Saanich Inlet (Vancouver Island, …
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Trojan Horses in the Marine Realm: Characterizing Protistan Parasite Ecology in Coastal Waters
… signatures have highlighted the fact that parasites belonging to the marine alveolate order Syndiniales are both abundant and ubiquitous in coastal and open ocean environments, suggesting a major role for this taxon in marine food webs. Two coastal sites, Saanich Inlet (Vancouver Island, …
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Parasitism, Predation Prediction: Modelling Variations in Ecological Interactions from Mechanisms to Networks
Ecological interactions are fundamental to ecology and evolution, regulating population dynamics as well as influencing the biodiversity and stability of communities. Intraspecific and environmental variations are often present in ecological interactions and are typically observable within the …
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