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 12 of 12 for “"Dense populations."”.
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The crustacean zooplankton communities of three prairie lakes subject to varying degrees of anoxia
… intermediate nutrient and algal concentrations. Dense populations of planktivorous fish Pimephales promelas and Culaea inconstans occurred in Lake 019 while Salmo gairdneri were stocked in Lakes 255 and 885... While large quantities of resting eggs were produced by D. siciloides in winterkilled …
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Avian determinants of rocky intertidal community structure in South Africa
… the growth rates and life-history patterns of populations of P. granularis were, in turn, modified by the increased availability of algal food. On unenriched shores rates of algal production and limpet growth and reproduction were slow. Seabirds thus influence trophic relationships between …
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The population dynamics and recruitment pattern of the phoronid, Phoronopsis viridis
… factors accounting for the persistence of these dense phoronid populations have not been studied although four hypotheses have been proposed (see Ronan 1975, 1978). These are: 1) dense clusters of adult phoronids increase the probability of successful gamete fertilization; 2) high densities of …
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Investigating volatile organic compound composition in Houston, Texas amidst an atmospheric regime shift.
… air pollution sources. Urban areas, with dense populations and diverse activities, significantly impact air quality and, consequently, public health. Volatile organic compounds (VOCs) are a key component of urban air quality, emitted from anthropogenic and biogenic sources. Over decades, …
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ECOLOGY OF ROCKY SUBTIDAL COMMUNITIES: THE ROLE OF MODIOLUS MODIOLUS (L) AND THE INFLUENCE OF DISTURBANCE, COMPETITION, AND MUTUALISM
… of overgrazing.</p><p>At exposed offshore sites, dense populations of Modiolus modiolus occurred at intermediate depths (11-18 m) but not at shallow depths (4-8 m) dominated by kelp (Laminaria digitata, Laminaria saccharina). Experiments indicated that chronic storm-generated disturbance caused …
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Investigating volatile organic compound composition in Houston, Texas amidst an atmospheric regime shift.
… air pollution sources. Urban areas, with dense populations and diverse activities, significantly impact air quality and, consequently, public health. Volatile organic compounds (VOCs) are a key component of urban air quality, emitted from anthropogenic and biogenic sources. Over decades, …
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Natural Hazards Monitoring Using Multiple Remote Sensing Techniques and Machine Learning Algorithms
… and ecosystems, especially in urban areas with dense populations. Satellite-based remote sensing techniques provide essential information for preventing and mitigating natural hazards. This dissertation has demonstrated both long-term and short-term monitoring methods using multiple remote …
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Understanding the relationship between urban areas and the boundary layer using remote sensing methods
… activity tends to congregate in cities, with populations becoming increasingly concentrated in urban areas as the 21st century progresses. Within urban areas, heavy and dense populations result in significantly altered land surface properties and introduce human-induced (also known as …
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Foraging for a foothold: Causes and consequences of dietary variation in a threatened avian pollinator
… what consequences it may have for individuals, populations, and ecosystems. This information may be particularly important for species that are threatened due to food limitation, as dietary variation could be used to inform conservation efforts. In this thesis, I used the hihi (Notiomystis …
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The morphology, biology and control of Ceroplastes ceriferus (Fabricius) and Ceroplastes sinensis Del Guercio in Virginia including a redescription of Ceroplastes floridensis Comstock (Homoptera: Coccoidea: Coccidae)
Populations of the wax scales, Ceroplastes ceriferus (Fabricius) and Ceroplastes sinensis Del Guercio, have become established in Virginia. A third species, Ceroplastes floridensis Comstock, is periodically brought into the state but is apparently unable to overwinter. Ceroplastes ceriferus the …
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The influence of surface - subsurface connectivity on groundwater flow and solute transport in a deltaic aquifer
… by multiple environmental issues including dense populations, urban development, and large-scale agricultural and industrial activities. The traditional geostatistical modeling of subsurface structure neglects the details of connected features or lack evidence to consider connected features …
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Genetic and Morphological Analyses of Three Freshwater Mussel Species in Isolated River Drainages Across Appalachia
… species diversity. These river systems harbor dense populations of freshwater mussels that have significant impacts on surrounding ecosystems; however, due to their sedentary lifestyles, freshwater mussels are particularly susceptible to many biotic and abiotic stressors. Managers strive to …