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 291 for “"infestation"”.
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Radial growth response of eastern hemlock to infestation of hemlock woolly adelgid
… and wood anatomy for trees that survived adelgid infestation, and to contrast dendroclimatic relationships across a latitudinal gradient. Six sites spanning the current range of hemlock woolly adelgid (HWA) infestation were selected. At each site, 23 infested eastern hemlocks were cored and two …
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Response of black bears to gypsy moth infestation in Shenandoah National Park, Virginia
The effects of gypsy moth infestation on the Shenandoah National Park (SNP) black bear population and habitat were studied during 1985 - 1991 by comparing radio telemetry, population, and behavioral data from preinfestation years (1982 - 1986) and years with extensive defoliation (1987 - 1991). …
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Sea lice infestation on wild salmonids in the southern part of the Icelandic Westfjords
Laxalús, Lepeophtheirus salmonis og grálús Caligus elongatus, eru náttúruleg sníkjudýr á laxfiskum í sjó. Lýsnar nærast á slímhúð, roði og blóði fiskanna og valda þannig streitu hjá þeim. Þær geta einar og sér valdið dauða fiska séu þær í miklum mæli en geta auk þess borið með sér aðra sýkla. …
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Effect of tree mortality on biogeochemical response after mountain pine beetle forest infestation, The
… of how altered inputs after bark beetle infestation are different in each horizon. A threshold response in the upper horizons was found for ammonium, which accumulated only under trees surrounded by at least 40% tree mortality. The elevated ammonium response was associated with increased …
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Investigations of White -Tailed Deer Infestation by Ixodes Scapularis on the Illinois River, USA
From 1998 to 2003, hunter-killed white-tailed deer (Odocoileus virginianus (Zimmermann)) were inspected for Ixodes scapularis (Say) (Acari: Ixodidae) to ascertain tick establishment along the Illinois River. A county-level study demonstrated that I. scapularis is the predominant tick in the …
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The Effects of Hydrilla Infestation on Selected Wintering Waterfowl: Santee Copper Lake System, South Carolina
… multiplied in total numbers during the years of infestation to levels never before seen on this lake. In addition, many species of waterfowl from the diving duck sub group such as Canvasback, Redhead, Scaup, Shoveler, and Bufflehead have been observed on the lake in greater numbers than any time …
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Biology and Impacts of Leech Infestation in Largemouth Bass (Micropterus Salmoides) in Back Bay, Virginia
… determine the biology and impacts of oral leech infestations on the Largemouth Bass. From this study, we intend to determine if the leeches are inflicting harm on the Largemouth Bass.</p>
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Combining ability for yeild of imidazolinone resistant maize inbred lines under artificial and natural striga infestation
… evaluated under natural and artificial striga infestation conditions in the Lake zone of Tanzania and Kisumu-Kenya in the 2006 season using alpha (0,1) lattice design. Grain yield was used as a proxy to maize resistance to imazapyr herbicide such that resistant materials were suitable …
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Impact of bark beetle infestation on water quality and hydrology in the Rocky Mountain West, The
The recent large-scale bark beetle infestations have altered the forested landscape covering much of the Rocky Mountain West. With canopy loss and changes in water and nutrient uptake, watershed hydrology and terrestrial biogeochemical cycling have been significantly altered. This dissertation …
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Environmental and behavioral factors associated with the infestation of vineyards by larvae of grape root borer
… exuviae sampling is most appropriate to assess infestations. Exuviae sampling in Virginia vineyards revealed infestations that ranged from light to very heavy. Eighteen biotic and abiotic variables were measured and used in analyses that assessed their relative contributions to differences in …
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Design and Development of a Low-cost Acoustic Device to Detect Pest Infestation in Stored Maize
… clean ones is critical and requires detection of infestation in stored grains. This study aimed at developing a rapid non-destructive detection system with three goals; - the first goal was to investigate the acoustic behavior of internally feeding S. zeamais (Coleoptera: Curculionidae) in maize. …
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The Relationship Between Salvinia molesta Infestation and the Microbial Ecology of Wetlands at Caddo Lake, TX, USA
<p>Wetlands are known to host many beneficial geochemical processes such as nutrient cycling and carbon sequestration. These processes are primarily driven by the microbial communities within a wetland. The establishment of non-native invasive species within wetlands has the potential to alter the …
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Investigation of dried distillers grains with solubles (DDGS) susceptibility to red flour beetle (Tribolium castaneum (Herbst)) infestation
<p>Protecting livestock feed from insect infestation is a common challenge that feed facility managers and farmers have to deal with. It becomes an issue of importance because insect infestation degrades feed quality and quantity. Dried Distillers Grains with Solubles (DDGS) is added to livestock …
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Changes in litter inputs and decomposition in headwater streams during a mountain pine beetle infestation of whitebark pine
… However, my results indicate that MPB infestations slow rates of nutrient processing in headwater streams despite an increase in litter quantity and quality.
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