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 22 for “"Dispersal-limitation"”.
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Regional Rarity: Consequences of Dispersal Limitation and Strategies for Reintroduction
… to rarity, including species traits, propagule limitation, ecological requirements, and population level processes such as demographic and environmental stochasticity. Yet, our understanding of species rarity remains limited since few studies have examined how these factors act in concert. This …
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Population differentiation, dispersal limitation, and local adaptation in the gametophytic fern Vittaria appalachiana
… be unlikely for those species that have limited dispersal potential. Alternatively, organisms may tolerate the change, which will be unlikely for those organisms that are not phenotypically plastic. A third potential response is to adapt to the new environment via rapid evolution, an unlikely …
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The Effects of Dispersal on Macroecological Patterns
… patterns are often attributed to the dynamics of dispersal (e.g. dispersal limitation or widespread dispersal). However, few studies actually measure dispersal to determine if dispersal rates are commensurate with the observed macroecological patterns. In this dissertation, I use population …
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Reestablishing Diversity in Our Hardwood Forests: A Transplant Study of Five Spring-Flowering Herbs
… This long-term depletion may result from dispersal limitation or environmental limitation. I tested the hypothesis that dispersal was the primary factor contributing to the absence of five spring-flowering herbaceous species in four secondary mesic hardwood forests. I transplanted adults …
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Connections between individual dispersal behavior and the multi-scale distribution of a saproxylic beetle
… study relating individual behavior (dispersal, habitat selection, and intra-specific interactions) with hierarchically-organized environmental filters to predict the incidence of Odontotaenius disjunctus (Passalidae), a saproxylic (=decayed wood dependent) beetle common to eastern …
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Population structure of the cyanobacterium Microcystis mediated by history, grazing and interstrain interactions
… We can conclude from this thesis that history (dispersal limitation and priority effects), grazing and interstrain interactions influence Microcystis population structure in a strongly strain-specific way depending on the functional traits of the strains, and that these factors also interact …
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Predicting the distribution and impacts of non-native birds in the Iberian Peninsula
… species since 1960. Methods to (1) account for dispersal limitation when modelling the distribution of spreading non-native species and (2) evaluate the likely transferability of native trained species distribution models were developed. The consistency of the species-environment relationship …
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Phylogeography of eastern leatherwood (Dirca palustris L.) resolved by chloroplast sequencing and microsatellite genotyping
… mesic forests and the paucity of vectors for dispersal of its seeds, represents a classic example of Reid's paradox of plant migration. It long has been presumed that temperate forest species of eastern North America persisted in southern glacial refugia near the Gulf Coast, after which many …
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Examining neotropical primate community structure at regional and local scales : insights from taxonomic and phylogenetic approaches
… of range cohesion suggests mechanisms other than dispersal are setting a limit to the number of species capable of co-occurring throughout a species’ range. These differences in species associations across geographic ranges generate variation in local community composition. I analyzed the relative …
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THE ROLE OF SPATIAL SCALES IN BIOGEOGRAPHY AND EVOLUTION OF SOIL-BORNE STREPTOMYCES
… ability, and collectively improve their dispersal. In this dissertation, I assess the impact of environmental gradients and geographical separation on Streptomyces community assembly, horizontal gene transfer events, and population differentiation. A combination of amplicon sequencing and …
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Topography as a determinant of range extent and overlap : a species level phylogenetic reconstruction and geographical range analysis of Syncarpha (Asteraceae)
… low-altitude taxa compared to mid-altitude taxa. Dispersal limitation, owing to the insular nature of montane habitats, seems the most likely mechanism to restrict the ranges of high-altitude taxa, whereas edaphic factors are more likely responsible for the restricted ranges of low-altitude taxa. …
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Community ecology of aquatic insects in forested headwater streams in the southern Appalachians
… with similar functional traits, whereas dispersal assembly emphasizes the importance of source pool characteristics and dispersal limitation in organizing a metacommunity. In this study, I developed a framework that uses spatially explicit patterns in taxonomic and functional measures of …
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Evolution of reptile diversity in tropical savannas - a study across scales and continents
… Chapter 3). Finally, I explore whether dispersal limitation, environment and geographic barriers or habitat specialization at landscape scale predict differences in phylogeographic structure across co-distributed lizard taxa (Chapter 4). Collectively, these chapters provide new insights …
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Evolution of reptile diversity in tropical savannas - a study across scales and continents
… Chapter 3). Finally, I explore whether dispersal limitation, environment and geographic barriers or habitat specialization at landscape scale predict differences in phylogeographic structure across co-distributed lizard taxa (Chapter 4). Collectively, these chapters provide new insights …
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Geographic distributions and vertebrate host specificity of genetic lineages of Borrelia burgdorferi
… sites. This suggests a degree of B. burgdorferi dispersal limitation or habitat specialization. OspC alleles known to cause disseminated infections in humans were found at the highest frequencies across sites, corresponding to Delaware’s high incidence of Lyme disease. ☐ Negative interactions …
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Spatiotemporally explicit incidence analysis of plant functional groups in metacommunities
Diese Arbeit untersucht die Rolle von Metagemeinschaftsmechanismen für die Diversität von Pflanzengemeinschaften in einer dynamischen, urbanen Landschaft. Dazu wird auf der Basis funktioneller Merkmale die relative Bedeutung von Ausbreitungslimitierung, abiotischem Stress und Konkurrenz bestimmt, …
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Systematics, Phylogeography and Ecology of Elaphomycetaceae
… possible effects of asexuality, trophic niche, dispersal method, and ocean barriers on population structure. In Chapter 2, we examine the systematics and phylogeography of the Elaphomycetaceae, a family consisting of the truffle genus Elaphomyces and the stalked genus Pseudotulostoma, …
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Dispersal, gene flow, niche divergence and local adaptation in the hyper-diverse ruschioid Aizoaceae: testing alternative modes of speciation in the Knersvlakte quartz field flora of the Succulent Karoo, South Africa
… was used to investigate the scale of seed dispersal (which is thought to be very limited due to the group's highly specialized ballistic dispersal mechanism) as well as correlates of population divergence in two ruschioid quartz-field specialists with very different growth forms (the …
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The Spatial and Temporal Ecology of Seed Dispersal by Gorillas in Lopé National Park, Gabon: Linking Patterns of Disperser Behavior and Recruitment in an Afrotropical Forest
… these patterns relate to the ecology of seed dispersal by gorillas.</p><p>Results suggest that gorilla foraging and nesting behavior in particular, impose both spatial and temporal limitations to the distribution of dispersed seeds. In addition, temporal variation in the gorilla diet and …
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