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 28 for “"Species recovery"”.
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Tragic Moral Conflict and Endangered Species Recovery
… conservation, and given the rapidity with which species are disappearing as the result of human economic activities, members of the societies that encourage and benefit from these activities, and that undertake the species recovery process, often face a terrible choice: either 1) intensively …
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POPULATION DYNAMICS OF SPECIES RECOVERY: MULTISCALE DEMOGRAPHY IN RESTORED HABITATS
… restoration has become an important tool for species recovery and conservation. Yet despite the conceptually-appealing lens of “if you build it, they will come” (i.e., the ‘Field of Dreams’ Hypothesis), restoration outcomes are highly variable and generally lack rigorous monitoring and …
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Escaping the extinction vortex: identifying factors affecting population performance and recovery in endangered Sierra Nevada bighorn sheep
… is one of the greatest threats to endangered species; when demographic, environmental, and genetic stochasticity interact with each other and with deterministic factors, such as habitat quality, to reinforce the demise of a small population. To successfully escape an extinction vortex and …
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Escaping the extinction vortex: identifying factors affecting population performance and recovery in endangered Sierra Nevada bighorn sheep
… is one of the greatest threats to endangered species; when demographic, environmental, and genetic stochasticity interact with each other and with deterministic factors, such as habitat quality, to reinforce the demise of a small population. To successfully escape an extinction vortex and …
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Environmental differences in the microbiome and exposure to the emerging fungal pathogen, Emydomyces testavorans, in conservation rearing and release programs for the western pond turtle (Actinemys marmorata)
… an extreme change in lifestyle for many animal species that may be accompanied by unintended alterations to host microbiota and immune function. It is unknown if the management practices of built environments (e.g., disinfection, simplified substrates, full water changes) induce shifts to …
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A Policy Analysis of the Endangered Species Act
… characteristics that are shared by recovering species listed in the Endangered Species Act (ESA). NatureServe population data was used to determine which listed species were recovering, and a logistic regression analysis was performed to identify which aspects of the ESA most contribute to …
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Restoration of threatened species populations: tuatara rehabilitations and re-introductions
… accountability for the restoration of threatened species populations is assessed for an endemic New Zealand reptile, the tuatara Sphenodon spp. The value of examining assumptions underlying concepts such as 'habitat requirements' theory and incorporating scientific principles into species recovery …
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IDENTIFICATION OF SPRING AND FALL SPAWNED EGGS AND THE GENETIC DISTINCTION OF GULF STURGEON IN THE CHOCTAWHATCHEE RIVER, ALABAMA-FLORIDA
… oxyrinchus desotoi</em>) is a threatened subspecies of Atlantic Sturgeon (<em>Acipenser oxyrinchus oxyrinchus</em>) which inhabits the Gulf Coast of the United States. Prior studies of Eurasian sturgeon species and Atlantic Sturgeon have revealed the existence of a dual spawning strategy …
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Maximum Entropy Modeling of Indiana Bat (Myotis Sodalis) Maternity Roost Habitat
… (Myotis sodalis) has been on the U.S. Endangered Species list due to disruption of hibernating bats in caves, summer habitat degradation, and more recently, the onset of White-nose Syndrome. The purpose of this study is to evaluate landscape variables associated with Indiana bat maternity roost …
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Cheatgrass (Bromus tectorum L.) management and native plant community recovery on sites selectively treated with Imazapic in Rocky Mountain National Park
… disturbed sites and competes with native plant species by rapidly establishing a root system capable of depleting soil moisture and available nitrogen, making cheatgrass control a priority when restoring disturbed areas within RMNP. The purposes of this study were to determine the effectiveness …
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Population Status and Trends of the Ringed Sawback (Graptemys oculifera) in The Pearl River Drainage of Mississippi and Louisiana
… It was listed as a federally threatened species under the Endangered Species Act in 1986 largely due to extensive habitat modification and major habitat degradation throughout portions of its confined geographic range. Despite species protections, alterations to the structure and flow of …
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Habitat use of Gulf Sturgeon (Acipenser oxyrinchus desotoi) in Pascagoula River holding areas and in estuarine and marine environments including Ship Island, Mississippi and Mobile Bay, Alabama
… (GS) are a federally threatened, anadromous species that inhabit coastal rivers in the northern Gulf of Mexico and make annual migrations between riverine and marine habitats. They are divided into western or an eastern river systems based on the location of their natal river relative to …
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DNA-based monitoring of ichthyoplankton for application to fish biodiversity conservation and fisheries management
… high-throughput, cost-effective, and precise species identification. This thesis aimed to apply DNA metabarcoding to ichthyoplankton samples collected along the Portuguese coast to enhance species detection and provide comprehensive insights into fish biodiversity. To achieve this goal, we: i) …
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Sustainable use and the laws regulating trade in threatened species in South Africa: lessons from the USA
… on sustainable use of threatened or endangered species in the international trade context. Escalating levels of illegal trade in threatened species are of major concern globally and undermines regulatory frameworks that seek to ensure the sustainable use of species for present and future …
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Building a Predictive Model of Delmarva Fox Squirrel (Sciurus niger cinereus) Occurrence Using Infrared Photomonitors
… habitat is a necessary component of this species' recovery. Habitat identification is also an important consideration when evaluating impacts of land development on this species distribution, which is limited to the Delmarva Peninsula. The goal of this study was to build a predictive model …
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Foraging for a foothold: Causes and consequences of dietary variation in a threatened avian pollinator
… some of the most fundamental interactions among species. While diet has long been treated as uniform within species, a paradigm shift is now taking place as ecologists recognize that individuals vary. However, questions remain about why this intraspecific variation exists and what consequences it …
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A Holistic Approach to Taxonomic Evaluation of Two Closely Related Endangered Freshwater Mussel Species, the Oyster Mussel (Epioblasma capsaeformis) and Tan Riffleshell (Epioblasma florentina walkeri) (Bivalvia: Unionidae)
… from the following additional populations or species: (1) E. capsaeformis from Duck River, TN; (2) E. florentina walkeri from Indian Creek, upper Clinch River, VA; (3) E. florentina walkeri from Big South Fork Cumberland River, TN; and (4) E. torulosa rangiana from Allegheny River, PA. Allelic …
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Development and Use of an Environmental DNA Tool to Monitor Recovery of the Critically Endangered Smalltooth Sawfish, Pristis pectinata, in the Northwest Atlantic
… nets. This research developed and validated a species-specific eDNA assay capable of targeting <em>P</em>. <em>pectinata</em> DNA in water samples at concentrations as low as 0.08 copies/μL using Droplet Digital™ PCR. This assay was then used in three formerly occupied estuaries in the western …
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Connecting the Plots: Anthropogenic Disturbance and Mojave Desert Tortoise (Gopherus agassizii) Genetic Connectivity
… habitat posing risks to the federally threatened species, which has declined as a result. As threats intensify, so does the need to protect tortoise habitat and connectivity. Functional corridors require appropriate habitat amounts and population densities, as individuals may need time to achieve …
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Assessment of morphological and molecular genetic variation of freshwater mussel species belonging to the genera Fusconaia, Pleurobema, and Pleuronaia in the upper Tennessee River basin
… three unrecognized, phylogenetically distinct species. These species were separated from their closest congener by 2.85%, 3.17%, and 6.32% based on pairwise genetic distances of ND1. Gaps created from aligning ITS1 sequences were coded as fifth characters, which phylogenetically separated most …
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