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 37 for “"seasonal abundance"”.
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Oviposition Preferences for Infusion-Baited Traps and Seasonal Abundance of Culex Mosquitoes in Southwestern Virginia
… studies provide information on the relative abundance of gravid mosquitoes. Ovitraps were used in the summers of 2002 and 2003 to measure the oviposition activity of Culex mosquitoes, mainly Cx. restuans and Cx. pipiens. In 2002, 1,345 egg rafts were collected from 5 traps set at different …
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Seasonal abundance and diversity of insects on Sclerocarya birrea and Berchemia discolor in Tshikundamalema, Limpopo Province, South Africa
… in South Africa. This study investigated the seasonal abundance and diversity of insects on S. birrea and B. discolor in Tshikundamalema Area, Limpopo Province, South Africa. Five trees were selected for each of the two tree species at two sampling sites with different vegetation cover, one …
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Impacts of Driving Factors on Annual Cicada Emergence in Relation to the Seasonal Abundance of Eastern Copperheads (Agkistrodon contortrix)
… change. Variability in cicada emergence and abundance has been shown to impact the species that rely on the rapid influx of nutrients. One such predator is the Eastern Copperhead (<italic>Agkistrodon contortrix</italic>) that has been noted feeding on emerging cicadas throughout their range. …
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Seasonal abundance and host preference of Culicoides in Virginia: with emphasis on the ecology of Culicoides variipennis (Diptera: Ceratopogonidae)
Trap type, time and site influenced the species composition, number collected and female age. Thirty species were collected in the BLTs and 17 in the bait traps. Culicoides biguattatus, C. obsoletus, C. stellifer, C. varipennis, and C. venustus were the most abundant species collected in both …
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Seasonal abundance and biology of hyperparasites and their hosts associated with Pieris rapae (L.) (Lepidoptera: Pieridae) in the Brassica crop system
Hyperparasitism of beneficial parasites of Pieris rapae was studied on Brassica crops in Montgomery County, Virginia. The goal of the study was to determine whether the hyperparasites attacking the larval parasites of P. rapae were capable of eliminating an introduced population of the larval …
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Habitat and host plant effects on the seasonal abundance of Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) among fruit orchards in northern Virginia
… and wild host plants nearby on H. halys relative abundance is unknown. Pheromone-based trapping studies conducted along woodland-to-orchard transects, along woodland borders at sites with and without adjacent orchards, and within the mid-canopy of several common wild host trees in woodland borders …
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Influence of cover crop management on Armyworm, Pseudaletia Unipuncta (Haworth) seasonal abundance, natural enemies, and yield in no-till corn, and diurnal abundance and spatial distribution of Armyworm
… unipuncta</i> (Lepidoptera: Noctuidae) abundance was lower in the mowed treatment compared with the sprayed treatment. Total cumulative armyworm-days in the sprayed treatment were greater than in the mowed treatment and were significantly greater in the sprayed treatment in two fields. …
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Bark beetles associated with killed Virginia pine (Pinus virginiana Mill.) in Patrick County, Virginia
… dominant insect species were analyzed regarding seasonal abundance and specificity in selecting suitable host material.
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Population dynamics and diversity of Synechococcus on the New England Shelf
… understanding of the factors that determine its abundance has been limited by available observational tools, which have not been able to resolve population dynamics at timescales that match response times of cells (hours-days). Development of an automated flow cytometer (FlowCytobot) has enabled …
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Habitat ecology of the native subtidal snail, Lacuna vincta, in the Gulf of Maine and the impact of two introduced species
… were conducted in order to examine the seasonal abundance, feeding preference, and growth of snails on nine different algal species. The results showed that there were differences in the seasonal abundance patterns of L. vincta populations on different algal species. However, the snail …
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Population dynamics and diversity of Synechococcus on the New England shelf
… understanding of the factors that determine its abundance has been limited by available observational tools, which have not been able to resolve population dynamics at timescales that match response times of cells (hours-days). Development of an automated flow cytometer (FlowCytobot) has enabled …
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Response of Stomoxys calcitrans and Musca domestica (Diptera: Muscidae) to Volatile Organic Compound Profiles from Ontario, Canada Dairy Farms
… and beef cattle livestock facilities. Their seasonal abundance causes damage to the industry in the United States. While similar damage has been documented in Canada, the majority of the research explores population dynamics of stable flies with respect to seasonal and temporal conditions. …
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The spatial and temporal abundance patterns of chaetognaths in the western North Atlantic Ocean
… was to identify the horizontal, vertical and seasonal abundance patterns of chaetognaths in this region and to relate these patterns to environmental conditions. Twenty one chaetognath species were identified, of which eighteen were abundant enough for analysis of the spatial and temporal …
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Sexual segregation and abundance trend of whale sharks in southern Mozambique
… annual sighting trends corroborate trends in the seasonal abundance from multi-state open robust design models. Total abundance decreased over the study period (89%), with females (92%) declining at a greater rate than males (81%) suggesting exposure to different conditions or threats. The rapid …
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Phenology of the European corn borer, Ostrinia nubilalis (Hubner) (Lepidoptera: Pyralidae) in Virginia
… degree day accumulations is reported. The seasonal abundance, within - field and within - plant distribution of first generation European corn borer egg masses were observed in field corn in Bedford County, Virginia. Peak egg mass abundance occurred ca. 200 degree days after the first borer …
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Predatory Impact of Exotic Cladoceran Cercopagis pengoi on the Zooplankton of Lake Ontario
… exists on its effects on the composition and abundance of zooplankton and phytoplankton. I assessed the impact of Cercopagis on the lower food-web of Lake Ontario by analyzing the historical and seasonal abundance of the crustacean zooplankton, by conducting laboratory feeding experiments, and …
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