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 59 for “"breeding populations"”.
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Simultaneous Mapping and Pyramiding of Fusarium Head Blight Resistance Loci in Wheat Breeding Populations
… plants has relied on large single-cross mapping populations derived from phenotypically divergent parent lines. This approach creates a disjunction between QTL mapping and marker-assisted breeding efforts aimed at pyramiding QTL, since no direct bridge exists between the populations within which …
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Re-Establishing Bald Eagle and Osprey Breeding Populations in South Dakota Through Hacking: A Feasibility Study
… hacking as a means to re-establish sustainable breeding populations of bald eagles and/or ospreys along major rivers, lakes, and reservoirs in South Dakota. Methods used in this study were descriptive in nature due to the large scale of the study, variation in habitat types, and the amount of …
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Quantification of genetic variation on Island-breeding populations of Procellariiformes : an assessment of the impact of the longline fishing industry on seabirds
… ocean could lead to a decrease in the size of breeding colonies, and is a cause for major concern as it may impact the long-term survival of these birds. Quantifying genetic variation in threatened populations is a valuable application of molecular biology in conservation. In this study genetic …
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Habitat ecology of the Painted Bunting on the Ozark Plateau
… Painted Bunting reaches the northern edge of its breeding range in southern Missouri. The presence of the Mark Twain National Forest in this area provides an opportunity to manage for the survival of breeding populations within the state. The objectives of this study were: 1. To determine the …
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Toadal Isolation: Genetic Connectivity of the Western Toad (Anaxyrus boreas) along I-90 in the Snoqualmie Pass Area of Washington State
… of western toad (<em>Anaxyrus boreas</em>) breeding populations along Interstate-90 near Snoqualmie Pass, WA. Sites north and south of the freeway were sampled during the breeding season of 2019. SNP loci were subsequently generated using the proprietary DArTseq<sup>TM</sup> (Canberra, ACT, …
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Migratory connectivity and differential patterns of decline in Barn Swallow (Hirundo rustica) in North America: Potential effects of factors on breeding and wintering grounds
Populations of several Neotropical migratory bird species have experienced declines in the recent decades but long-distance migrant aerial insectivores seem to be declining at greater rates than any other group. The Barn Swallow (Hirundo rustica) is a long-distance migrant and an aerial insectivore …
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The Winter Ecology of the Piping Plover (Charadrius melodus) in Coastal Georgia
… a federally listed species with three distinct breeding populations, including Great Plains (threatened), Great Lakes (endangered), and Atlantic Coast (threatened), all of which winter along the Atlnatic and Gulf coasts of the United States. I studied the winter ecology of the Piping Plovers on …
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The population dynamics and conservation of the African Black Oystercatcher, Haematopus moquini
… species are (a) its inherently low and variable breeding success; (b) its ground-nesting habit, making it vulnerable to numerous direct and indirect impacts of human disturbance; (c) its susceptibility to mass mortalities, particularly of adult birds in high-density breeding populations. Inherent …
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Reproductive Success of American Kestrels (<em>Falco sparverius</em>) Nesting in Boxes along an Interstate in Northeastern Tennessee.
… the addition of nest boxes can increase local breeding populations. These programs also facilitate the collection of data on breeding kestrels.</p><p>This study focuses on an American Kestrel (<em>Falco sparverius</em>) nest box trail along Interstate 26 in northeastern Tennessee during the …
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Evaluation of 4 cycles of S1 recurrent selection in BSP1 and BSP2 popcorn populations
<p>The improvement of germplasm and breeding populations is an important objective of maize breeding programs. S1 recurrent selection has been shown to be an effective means of intrapopulation improvement for many different crops and has been practiced extensively in maize. The objective of this …
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On the use of demographic models to inform amphibian conservation and management: A case study of the reticulated flatwoods salamander
… years of mark recapture data collected from two breeding populations of A. bishopi to construct a demographic model that can be used to evaluate future extinction risk. In chapter one, we quantify population sizes through time, and estimate the impact of annual variability in numbers on genetic …
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Evaluation of Duck Production On Waterfowl Production Areas in Northeast North Dakota
… of three WPA’s. Wetland habitat conditions, breeding populations and nesting were evaluated all four years. Brood observations were made during the last three years and nesting cover was evaluated during the last two years of investigation. Wetland habitat conditions were generally favorable …
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Evaluating the Adaptive Genomic Landscape of Remnant and Backcross American Chestnut Populations to Inform Germplasm Conservation
… (Cryphonectria parasitica) decimated chestnut populations, resulting in the loss of billions of trees. Disease-resistant American chestnut populations have been developed, but the introgression of wild adaptive diversity into these breeding populations will be necessary to develop locally …
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The impact of longline fishing on the seabirds breeding on Marion Island
… the impact of longline fishing on the seabirds breeding on the sub-Antarctic Prince Edward Islands. The development of a demersal longline fishery for Patagonian toothfish Dissostichus eleginoides close to the islands with almost complete observer coverage during the study allowed a detailed …
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Comparative analyses identify adaptive genetic variation in crops and crop wild relatives
… its distribution and abundance in natural populations using population genetic approaches. This is also the first study in plants to apply population genetic approaches to identify chromosomal structural variation. In Chapter 3, I used a population genetic approach to identify genomic …
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Ecological segregation of burrowing petrels (Procellariidae) at Marion Island
… slope angle or slope aspect. 3. The Kerguelen breeding biologies and diets of Greatwinged Petrels, Petrels and Softplumaged Petrels were studied. The species bred at different times of the year with non-overlapping chick-rearing periods. Incubation periods were similar but, relative to adult …
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Using spontaneous haploid genome doubling to access favorable alleles in exotic maize (Zea mays L.) germplasm
<p>Maize (Zea mays L.) breeding contributed to significant yield gains in the past decades. However, it has been accompanied by narrowing its germplasm base. Breeding from exotic maize germplasm, such as BS39, provides a unique opportunity for broadening the genetic base of US Corn Belt germplasm. …
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Exotic Armored Catfishes in Texas: Reproductive Biology, and Effects of Foraging on Egg Survival of Native Fishes (Etheostoma fonticola, Endangered and Dionda diaboli, Threatened)
… waters in 1964. There has been concern that breeding populations of these exotics could affect native species through dietary overlap, egg predation, and other factors. This study focused on two related topics: 1. the reproductive biology of Hypostomus in the San Marcos River, Texas; and 2. …
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Background-dependent genetic architecture of Fusarium head blight resistance in U.S. hard winter wheat
… trait loci (QTL) through marker-assisted breeding is an effective strategy for improving resistance; however, the effectiveness of QTL combinations and the genomic architecture of introgression populations remain incompletely understood. This study evaluated the effects of three major FHB …
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Population Dynamics of the Endangered Black-capped Vireo (Vireo atricapilla)
… heterogeneity and fragmentation create local populations that differ in habitat availability and predator communities and present unique tradeoffs between reproductive success and survival. Varying demography across the landscape can result in a metapopulation structure and the recognition of …
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