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 69 for “"isolation-by-distance"”.
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Population Genetics of Sabatia Campestris (Gentianaceae), a State-Endangered Plant of the Illinois Prairie
… and at a regional scale. The results identified isolation by distance patterns indicating that Illinois populations differed genetically from central populations that were collected from Texas. In addition, isolation by distance analyses indicated that genetic differences were present among …
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Spatial Genetic Structure in the Mount Vernon Prairie Population of Rudbeckia Hirta
… will be structured in space as a result of isolation by distance, but this prediction has seldom been tested. This study quantified the magnitude and scale of spatial genetic structure in a natural population of the prairie plant, Rudbeckia hirta. A total of 204 randomly distributed pairs of …
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MICROSATELLITE ANALYSIS OF POPULATION STRUCTURE IN THE SANTA ANA SPECKLED DACE (RHINICTHYS OSCULUS)
… p=0.001). This structure is best explained by watershed as well as isolation by distance (R<sup>2</sup>=.2286, p=0.010). Highly significant geographic structure also exists among the geographic regions of Southern California, Central Coast, and Owen’s River Valley regions (R<sub>ST=</sub> …
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Mating Habits, Dispersal and Postglacial Range Expansion of Nigronia Serricornis (Say) (Megaloptera: Corydalidae)
It was hypothesized that fragmentation and isolation-by-distance would be evident in the genetic population structure, due to poor dispersal ability. Using sequence data from a 630-base fragment of cytochrome oxidase I (COI), nested clade phylogeographical analysis (NCPA) was performed to determine …
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Scale dependent genetic structure of Idaho Giant salamanders (Dicamptodon aterrimus) in stream networks
… data to test population structure models by (i) examining hierarchical partitioning of genetic variation in stream networks and (ii) testing for genetic isolation by distance along stream corridors versus overland pathways. Replicated sampling of streams within catchments within three …
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Scale dependent genetic structure of Idaho Giant salamanders (Dicamptodon aterrimus) in stream networks
… data to test population structure models by (i) examining hierarchical partitioning of genetic variation in stream networks and (ii) testing for genetic isolation by distance along stream corridors versus overland pathways. Replicated sampling of streams within catchments within three …
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Comparative Population Genomics and Speciation of Snakes Across the North American Deserts
… can be studied using a phylogeographic approach, by identifying regions that promote lineage divergence, addressing whether speciation has occurred with gene flow, and when extended to multiple taxa, addressing if the same patterns of speciation are shared across codistributed groups with …
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A Comparison of Genetic Differentiation and Gene Flow Among Populations of Two Species of Mice (Peromyscus)
… populations of P. attwateri are not affected by gene flow. Populations of P. leucopus tend to show genetic differences due more to isolation by distance.
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Tracing the Genetic Footprints of the Redbelly Yellowtail Fusilier, Caesio Cuning, Across Multiple Spatial and Evolutionary Scales
… of these multi-species resources is hampered by limited species-specific population level information. The reefs in the western tropical Pacific Ocean, including the Coral Triangle, are the most bio-diverse in the world. Home to more than 400 million people, this region contains some of the …
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Genetic population structure and dispersal of two North American woodpeckers in ephemeral habitats
… lower genetic connectivity among sites separated by large gaps in forested habitat. Across the boreal forest, hairy woodpeckers have low genetic differentiation in mtDNA that lacks spatial structure, but moderate genetic differentiation in an isolation by distance pattern in microsatellite data. …
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Genetic population structure and dispersal of two North American woodpeckers in ephemeral habitats
… lower genetic connectivity among sites separated by large gaps in forested habitat. Across the boreal forest, hairy woodpeckers have low genetic differentiation in mtDNA that lacks spatial structure, but moderate genetic differentiation in an isolation by distance pattern in microsatellite data. …
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Elucidating the conservation status of Michigan's red-eared slider (trachemys scripta elegans): A phylogeographic approach
… are non-native and have been introduced by humans via the pet-trade from throughout the United States. To differentiate between these possibilities, I compare the genetic structure of six populations throughout Indiana, Michigan, and Ohio, using six microsatellite markers. No …
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The Prince or the Depauperate? Population Genetics of the Rare, Closed-flower Erica occulta
… diversity of E. occulta and how it varies with distance and to make inferences about the breeding system and gene flow based on genetic diversity measures. Due to the population’s small, isolated nature, it was predicted that the species would have a low number of alleles and low heterozygosity. …
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Population ecology and conservation genetics of the smooth snake (Coronella austriaca) in a fragmented heath landscape
… population structuring as a result of isolation-by-distance effects, in addition to evidence of male-biased dispersal. At the wider scale, analysis of seven distinct populations across Dorset also found small but significant differences in genetic diversity. The observed patterns were …
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Phylogeography and Diversification of the Greenish Blue Butterfly (Plebejus Saepiolus) in Western North America
… were identified in P. saepiolus with moderate isolation by distance, but no evidence of rapid expansion. Multiple phylogeographic models can characterize the complex genetic pattern in P. saepiolus. Genetic variation partitioned by mountain range with a few exceptions, however wing pattern …
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Phylogeography and Diversification of the Greenish Blue Butterfly (Plebejus Saepiolus) in Western North America
… were identified in P. saepiolus with moderate isolation by distance, but no evidence of rapid expansion. Multiple phylogeographic models can characterize the complex genetic pattern in P. saepiolus. Genetic variation partitioned by mountain range with a few exceptions, however wing pattern …
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Influence Of Landscape On Gene Differentiation In The American Pika (Ochotona princeps) Within The Interstate 90 Snoqualmie Pass Corridor
… Mantel tests, which removed the effect of isolation by distance (IBD), compared the corresponding genetic and geographic matrices to assess which geographic model resulted in the best fit. A number of models showed significant correlations when compared to IBD but none of the top models was …
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The Conservation Genetics of Two Emydid Turtles: <i>Emydoidea blandingii</i> and <i>Malaclemys terrapin</i>
<p>Conservation of turtles is complicated by their sensitivity to habitat degradation and overexploitation. I used microsatellites and standard population genetic analyses to explore genetic diversity, population structure, paternity and demographic history in two emydid turtles that are currently …
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Population structure and the molecular genetics of petal spot pigmentation in Gorteria diffusa
… discrete floral morphotypes, defined by extreme intraspecific variation in capitulum phenotype. Between-morphotype variation in the position and complexity of petal spots is associated with differential pollinator behavioural responses. As such, this system has much potential for …
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An Assessment of Population Genetic Structure in Guillemots (Cepphus)
… differentiation appeared to follow a pattern of isolation by distance in both species. In pigeon guillemots, evidence suggested that population genetic structure arose through a combination of both historical and contemporary processes. Based on my results, I recommend that pigeon guillemot …
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