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 26 for “"range-restricted"”.
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Rarity, cause or consequence: comparative landscape genomics of six lichenized fungi with contrasting range sizes, life histories, and morphologies
… associated with rarity in related widespread and range-restricted lichenized fungi sampled throughout the Appalachian Mountains of eastern North America. This research produced robust genomic datasets for widespread species (Punctelia rudecta, Lepraria finkii, and Usnea strigosa) and rare …
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Climatic specialisation: an explanation for the range size and distribution of bryophytes on a tropical island elevational gradient
… and insolation, which restrict their geographic range. However, little is known about the mechanisms that connect bryophytes with climatic factors. In this thesis I test the idea of ecophysiological specialisation using reciprocal transplant experiments, along with direct laboratory measurements …
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An Historical Analysis of Fiscal Equity in the Commonwealth of Virginia: 2004-2018
… of wealth neutrality and fiscal equity were range, restricted range, restricted range ratio, coefficient of variation, the Theil Index, the Pearson Correlation, regression, slope, elasticity, the Gini Coefficient, and the McLoone Index. At fixed intervals reflecting FY2004, 2006, 2008, 2010, …
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Genetic variation of rana fuscigula in Southern Africa
… now routinely investigate the DNA of a range of organisms. The elationships between taxa and the phylogeny of groups is determined by examining the differences and similarities between them. These differences are then appropriately analyzed. lt is important to understand the natural …
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Helitrons are enriched in lichenized fungi with long generation length and small distribution sizes
… structural instability and chromosomal rearrangements, particularly under conditions like environmental or genetic stress. In this study, we generated 18 new long-read reference genomes for lichenized fungi, which form obligate mutualistic symbioses with algae or a cyanobacteria. We used …
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Searching for answers to the silent decline: first estimates of survival and recruitment for the critically endangered Rose's mountain toadlet, Capensibufo rosei
… to suggest that the population is small, range-restricted and highly unstable, and that disturbances at the breeding site during good breeding years may cause the population to crash.
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Physiological tolerances of high temperatures in Fynbos birds: implications for climate change
… already responded to changes in climate, with range shifts towards higher latitudes and altitudes being one of the most common responses to climate warming. Bioclimatic envelope modelling provides a useful method for predicting a species, future distribution under a given climate change …
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Conservation Genetics and Distribution of the Yazoo Darter (Etheostoma Raneyi)
The Yazoo Darter is a range-restricted endemic fish in north-central Mississippi. Because the limited and fragmented range of this species puts it at risk of extinction, the Yazoo Darter has been classified as vulnerable or sensitive by several agencies and conservation organizations. However, the …
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A cylindrical specimen holder for electron cryo-tomography
… equal quality at all viewing angles, with a tilt range restricted only by the physical limits of the microscope. Tomograms from specimens such as gold particles and liposomes show that the effects of the missing wedge are substantially reduced, with much improved resolution along the electron beam …
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A cylindrical specimen holder for electron cryo-tomography
… equal quality at all viewing angles, with a tilt range restricted only by the physical limits of the microscope. Tomograms from specimens such as gold particles and liposomes show that the effects of the missing wedge are substantially reduced, with much improved resolution along the electron beam …
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Equity in Mississippi: a Study of Public School Funding
… terms of horizontal and vertical equity through range, restricted range, and federal range ratio. The horizontal coefficient of variation is also delineated in contrast to the original 1993 design. Fiscal neutrality is related through the use of a Pearson Product Moment Correlation Coefficient …
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Sense in Sensitivity: Assessing Species Vulnerability to Climate Change
… vulnerability exposure was calculated under a range of climate change scenarios. The sensitivity and exposure scores are synthesised into a measure of vulnerability. The result of the equation, Vulnerability= Exposure + Sensitivity, has revealed which Mammal species are most vulnerable; those …
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Assessing the vulnerability of South Africa's national protected areas to climate change
… significantly which will have consequences for range-restricted species. Management strategies need to take heed of the magnitude of potential impacts identified in this study and work towards developing adaptation pathways.
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Analysis of Fiscal Equity in Virginia: 2004 - 2020
… divisions in Virginia. These statistics include Range, Restricted Range, Coefficient of Variation, Gini Coefficient, and McLoone Index. The findings of the 2004-2020 analyses are compared to the findings of the 2005 study of fiscal equity in Virginia. The noted results of the analyses have …
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Reassessment of species limits and diversification process in the Cape grass genus Ehrharta Thunb
… GCFR, and to assess the existence of multiple, range-restricted cryptic species at high elevations. The Cape grass genus Ehrharta is an ideal system in which to investigate these processes, as it contains low-, mid-, and high-elevation lineages, with a previously documented adaptive radiation in …
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Microgeographic divergence in a single-island endemic: evolutionary patterns and conservation implications
… of local adaptation within one of the most range-restricted bird species in North America, the Island Scrub-Jay (Aphelocoma insularis). The species is restricted to Santa Cruz Island in southern California, USA, where it occurs in a diversity of habitat types within its narrow (250 km2) …
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Biodiversity, conservation and mimicry rings of Appalachian millipedes
… on the planet, including many endemic and range-restricted species. Millipedes have extremely low dispersal capacity, strict environmental requirements for survival and, in the case of the family Xystodesmidae, are completely blind. Coupled with the complex topology of the Appalachians, …
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The effects of temperature on the Ethiopian Bush-crow and the White-tailed Swallow
… to recent anthropogenic climate change species’ ranges are already changing, adding to the complexity of describing their ecological boundaries. The threat posed to species by climate change cannot be understated, and our ability to understand the drivers and mechanisms which underlie species’ …
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Applications of the IUCN Red List in evaluating global extinction risk of timber tree species.
… Information Facility (GBIF) in timber species range mapping; to assess current extinction risk of a priority subset of timber tree species by applying the IUCN Red List (Red List) of Threatened Species Categories and Criteria; and, lastly, to evaluate the uncertainty of these preliminary Red …
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Potential implications of climate change for Rooibos (A. linearis) production and distribution in the greater Cederberg region, South Africa
… and exported for the herbal tea market. Being a range-restricted species, climate change poses a threat to wild plants and their dependent communities, as well as the sustainability of the rooibos industry. Climate mediated impacts on rooibos are mostly substantiated by anecdotal evidence from …
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