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 157 for “"population ecology"”.
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Population ecology of Pleuroptya ruralis (Scopoli) (Pyralidae:Pyraustinae)
A natural population of Pleuroptya ruralis has been studied for three years with the following aims: (1) to elucidate its life history; (2) to study the variations in the larval and adult densities; (3) to identify the mortality factors acting upon them; (4) to investigate possible relationships …
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Landscape and population ecology of ring-necked pheasants
… linking field- and landscape-scale management to population-level responses. I collected detailed demographic data on ring-necked pheasants on 14 public and private grasslands in east-central Illinois. I monitored 108 nests, 38 broods, and the survival and habitat use of 108 adult female …
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Sauger Population Ecology in Three Missouri River Mainstem Reservoirs
<p>Sauger Sander canadensis populations have experienced widespread declines across much of their range. Factors suspected to contribute to these declines include hybridization, exploitation, loss of spawning areas, and general habitat alterations associated with regulated rivers. Several sauger …
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Understanding White-Tailed Deer Productivity: Population Ecology of Neonates
… and often fragmented, which could affect fawn ecology. To what extent fawns use Conservation Reserve Program (CRP) grasslands in the Northern Great Plains is unknown. Reductions in CRP enrollments during our study provided a unique opportunity to evaluate neonate ecology during a period of …
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The Role of Climate Variability in Duck Population Ecology
… change is having profound impacts on animal populations globally, and is expected to become a stronger stressor in future, influencing abundance and persistence of many species. In northern hemisphere bird populations, local weather and climate cycles play important roles via effects on …
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Population ecology and parasitism in bumble bees (Hymenoptera: apidae)
… of Bombus pennsylvanicus (Degeer) was studied. Population levels and the production of males and young queens varied among colonies and between years. Mean longevity of worker bees decreased significantly toward the end of the season. Mean size of emerging worker bees increased significantly …
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Nest Morphogenesis and Population Ecology of Two Species of Formica
… Grand Forks County, North Dakota. The general ecology for each species was determined with emphasis on mound morphogenesis, colony-founding and population characteristics. For each species the following samples and data were collected: random samples of each population, thatch sample, external …
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Population ecology and management of the invasive plant, Lespedeza cuneata
Lespedeza cuneata is one of the worst invasive plants across much of the North American Great Plains. In this dissertation, I describe the combination of field experimentation, statistical modeling and spatially explicit computer simulations that I used to investigate the persistence and spread of …
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Population Ecology of Rhabdomys dilectus dilectus in the Western Soutpansberg Mountains
This thesis explores the population ecology of the four-striped grass mouse (Rhabdomys dilectus dilectus) at the Lajuma Research Centre, within the Luvhondo Nature Reserve in the Western Soutpansberg Mountains, South Africa. Conducted from July 2020 to November 2021, the study examined the species' …
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Using population ecology to inform the conservation of Nevada's rare plants
Population ecology is a fundamental tenet of conservation biology. Estimating population size is a necessary first step in assessing species vulnerability, and to the subsequent examination of population viability, prediction of extinction risks, and evaluation of conservation objectives. …
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Population ecology of the dinoflagellate species Lingulodinium Polyedrum in southern California
… bloom (HAB) species. This study explores the population ecology of Lingulodinium polyedrum (F. Stein) J.D. Dodge, a common bloom-forming dinoflagellate species in Southern California. Lingulodinium polyedrum is not considered a HAB species, but functions as one of the main model organisms for …
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Population Ecology of Black Bears in the Alleghany Mountains of Virginia
… on 2 areas and designed to investigate the ecology of a hunted population of American black bears (Ursus americanus) in the Alleghany Mountains of western Virginia. Over the course of our research, we handled 1,041 individual bears >18 months old and gathered reproductive data from females …
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Using genetic tools to understand the population ecology of stream fishes
… with regard to the size and structure of populations and patterns of dispersal between populations, which complicates assessment of how human activities, both harmful and beneficial, will affect persistence. I used genetic tools to further this understanding in three case-study fish …
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Population ecology of wood ducks in Nevada under experimental manipulation of harvest
Wildlife populations are regulated by vital rates that are influenced by environmental conditions, demographic stochasticity and increasingly, anthropogenic effects. Management directed at specific vital rates, like per capita births or deaths, is often used as a tool to influence change in …
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Population ecology of feral horses in an era of fertility control management
… requires intervention to regulate growth of populations that would otherwise become overabundant. Controlling fecundity using contraceptives has become an increasingly popular tool for attempting to manage locally overabundant wildlife species, but the population-level effects of such …
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Population ecology of Pinus pungens in pine-oak forests of southwestern Virginia
I studied aspects of the population ecology of table mountain pine, <i>Pinus pungens</i>, in pine-oak forests on Brush Mountain, Montgomery County, Virginia. The objective of this study was to examine the age structure and recruitment dynamics of <i>P. pungens</i>, a fire-adapted conifer, and to …
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Population Ecology of Invasive Lionfish (Pterois volitans/miles) in the South Atlantic Bight
… 80%. Research on lionfish impacts, biology and ecology is heavily focused in tropical and subtropical systems, with considerably less research effort occurring in the temperate regions of their invaded range, such as the South Atlantic Bight. Lionfish life history estimates are important to …
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Seed ecophysiology and plant population ecology of Cynoglossum officinale L. and Tragopogon spp.
… Tragopogon spp. and dynamics of seed and plant populations in T.pratensis were investigated. A deep innate (primary) dormancy was found in C. officinale seeds, and the seed coat of this species played an important role in the regulation of seed germination by controlling 02availability to the …
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