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.
Results
Showing 1 to 13 of 13 for “"population bottleneck"”.
-
Analysis of a Blue Catfish Population in a Southeastern Reservoir: Lake Norman, North Carolina
… examined the diet, growth, movement, population genetics, and possible consumption demands of an introduced blue catfish Ictalurus furcatus population in Lake Norman, North Carolina. Clupeids, Corbicula fluminea, and Chara were the predominant food items (percent stomach contents by …
-
The Response of a protandrous species to exploitation, and the implications for management: a case study with patellid limpets
… model was made of three component sub-models; a population fecundity model, a gamete dispersal model, and a fertilisation model. The model makes explicit account of sperm limitation, and is based upon data collected through field and laboratory investigations conducted as part of this …
-
Population genetics of wood frogs (Lithobates sylvaticus) in a forested ridge-top wetland ecosystem
… Genetic data can be used to address current population status, probability of persistence, and population connectivity. The objective of this study was to determine the amount and distribution of population genetic diversity of wood frogs in natural ridge-top wetlands and what factors …
-
Isozyme variation within the Fraser fir population on Mt. Rogers, Virginia
… Poir.) on Mt. Rogers is an isolated relic population and part of the southern Appalachian spruce-fir ecosystem. The population has, so far, been able to withstand the impacts of insect infestation and the possible influence of atmospheric deposition factors which may be causing mortality in …
-
Dna Profiling of Captive Roseate Spoonbill (Ajaia Ajaja) Populations As a Mechanism of Determining Lineage in Colonial Nesting Birds.
… Gulf coast to the pampas of Argentina. The U.S. population suffered a severe bottleneck from 1890 to 1920. The population's recovery was slow and partially credited to migrations from Mexican rookeries, but a gene pool reduction would be expected. Five polymorphic Spoonbill autosomal short tandem …
-
Genetic effects of persistent population bottlenecks on long-lived organisms with overlapping generations
<p>A population bottleneck is an event in which one population experiences a substantial reduction in number of individuals. The genetic consequences of bottlenecks include increased inbreeding, accelerated rate of random genetic drift, and decreased genetic diversity and adaptive evolution …
-
The use of microsatellites as a surrogate for quantitative trait variation in conservation
… in maintaining genetic variation in small populations, with a view to maintaining fitness and the ability of the species to adapt to changing environmental conditions. The most important type of genetic variation is therefore that which affects fitness and reproduction, and is therefore …
-
African elephant conservation and population genetics
… success would have increased the effective population size of mtDNA relative to nuclear markers in elephantids, thus contributing to the persistence of incongruent mtDNA phylogeographic patterns. (2) Past research on African elephant genetics has focused heavily on the phylogenetic …
-
The Principles and Applications of Plasmid Transfer in Microbial Communities
… depends on the plasmid’s ability to persist in a population. However, for a community consisting of multiple populations transferring multiple plasmids, the conditions underlying plasmid persistence are poorly understood. Here, I described a plasmid-centric framework that makes it computationally …
-
Illuminating the Drivers of Genomic Diversification in Lamprologine Cichlids of the Lower Congo River
… for understanding complex speciation and population diversification processes. In my research, I explore various drivers of diversification, and adaptive evolution in rheophilic lamprologine cichlids endemic to the LCR, including <em>Lamprologus lethops</em>, the only blind cichlid fish …
-
Evaluation of an Augmentation of Rocky Mountain Bighorn Sheep at Badlands National Park, South Dakota
… South Dakota. Based on the estimated effective population size and analysis of molecular data, the bighorn sheep population at BNP underwent a population bottleneck at founding. Recommendations to restore genetic diversity in the BNP population included a mixed-sex augmentation (n > 30) from an …
-
Introgression, Population Structure, and Systematics of the Sphagnum capillifolium complex
… and historical events affect patterns of population divergence and gene flow is an important question in evolution and biogeography. Sphagnum subgenus Acutifolia is one of the four major subgenera of Sphagnum peatmoss comprising numerous species with broad geographic ranges and diverse …
-
Ecology of Tigers in Churia Habitat and a Non-Invasive Genetic Approach to Tiger Conservation in Terai Arc, Nepal
… for intact and healthy ecosystems. Their wild populations have plummeted to fewer than 3,200 individuals in the last four decades and threats to these apex predators are mounting rather than diminishing. Global conservation bodies (Global Tiger Initiative, World Wildlife Fund, Wildlife …