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 107 for “"imperiled"”.
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Thermoregulatory ecology and roost selection of imperiled bat species
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Rapid Quantitative Assessment to Assist in Identification of Imperiled Fishes
Methodologies for ranking conservation status of fishes range from a rapid qualitative method (e.g., expert opinion) commonly used by state agencies to time-consuming quantitative method (i.e., Species Status Assessment; SSA) currently used by US Fish and Wildlife Service. Purpose of this study was …
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Morphological, Molecular, and Biogeographical Variation within the Imperiled Virginia Spiraea
Spiraea virginiana Britton is a rare federally listed rhizomatous shrub endemic to the southern Blue Ridge and Appalachian Plateau physiographic provinces. Populations of S. virginiana are found restricted to scoured sections of high gradient streams within the Ohio River drainage. Present evidence …
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Migration phenology and fertility of imperiled Illinois salamander (Ambystoma) species
Made available in DSpace on 2022-01-12T21:46:56Z (GMT). No. of bitstreams: 2 CALLAHAN-THESIS-2021.pdf: 2826996 bytes, checksum: 5cc241706b5a8e00e8dc8731cde47fc3 (MD5) LICENSE.txt: 4210 bytes, checksum: 284778725358f3904105b35f49d32554 (MD5) Previous issue date: 2021-07-21
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IMPERILED FEMININITY:RECONFIGURING GENDER IN A CONTEXT OF HEIGHTENED VIOLENCE AGAINST WOMEN
This dissertation clarifies the manner in which violence against women is implicated in the re-constitution of gender in Chihuahua. Using data collected with a mixed methods, multi-staged protocol, this dissertation investigates how the routine threat of gender violence and the common presence of …
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Altering artificial abodes: Addressing two management concerns of artificial roosts for imperiled bat species
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Applying new aquatic habitat data to manage invasive and imperiled crayfishes in North America
… invasive, and an even greater number are highly imperiled and at risk for extinction. In addition, new GIS data layers developed specifically for freshwater have recently been developed in order to better characterize freshwater habitat in modeling applications. My research applies these new …
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Do freshwater growth opportunities and migration barriers limit recovery of imperiled anadromous Oncorhynchus mykiss populations?
Steelhead (Oncorhynchus mykiss) populations in the Puget Sound Distinct Population Segment are far below their historic abundance and are currently listed as Threatened under the Endangered Species Act. Despite the declines in steelhead abundance, resident O. mykiss populations appear to be …
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Patterns of Historical and Contemporary Distribution and Occurrence of Imperiled Fish Populations in East Texas Streams
… stream have contributed to the persistence of imperiled fishes in east Texas. In this study, I was able to collect eight of the ten proposed focal species, with the exceptions being the Silverband Shiner and Orangebelly Darter. Changes in suitable habitats for the species between time periods …
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COMMUNITY STRUCTURE AND FUNCTIONAL DIVERSITY OF IMPERILED GREAT PLAINS FISHES: IMPLICATIONS FOR CONSERVATION OF TWO ENDANGERED SHINERS (SHARPNOSE SHINER NOTROPIS OXYRHYNCHUS AND SMALLEYE SHINER NOTROPIS BUCCULA) IN THE UPPER BRAZOS RIVER, TEXAS
<p>Anthropogenic practices such as groundwater pumping, land use change, and the implementation of dams have caused significant change in freshwater ecosystems, especially in the Great Plains of North America where pelagic broadcast spawning fish species are declining due to the loss of the natural …
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Resolving the evolutionary history of multiple groups of freshwater mussels (Bivalvia : Unionidae).
… in freshwater mussels being one of the most imperiled groups of organisms on Earth, and global collaboration is needed to understand the factors contributing to their demise. Although considerable progress has been made in understanding ecology and evolution of freshwater mussels, the biology …
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Responses of different community user groups to biodiversity conservation of protected areas in lowland fynbos : the case of the Wolfgat Nature Reserve
In South Africa the highly threatened status of imperiled lowland fynbos protected areas (PAs) have made conservation managers realize that getting local communities and user groups to beneficially use protected areas involving them in protected area management in a manner that links with local …
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Down Stream [Appalachia]
… and connectedness—illuminating the precarity of imperiled freshwater species in the Appalachian region. The exhibition is composed of reflective, refractive sculptures and underwater video footage, surrounded by fully-immersive spatial audio. Both the audio and visual elements react to audience …
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The Influence of Environmental Conditions and Co-Occurring Parasites on Blood Physiology in Eastern Hellbenders (<i>Cryptobranchus alleganiensis</i>)
… infectious agents is essential to conserving imperiled amphibian species. Here, I measured hematocrit, hemoglobin, relative proportions of polychromatic red blood cells, and white blood cell differentials in a wild population of male Eastern Hellbender salamanders (<i>Cryptobranchus …
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Characterizing Wetland Hydrology, Chemistry, And Soils For An Endemic Crayfish, The Piedmont Blue Burrower
… with crayfish ranking as the second most imperiled taxonomic group in North America. Primary burrowers represent only 15% of crayfish species in North America; however, they constitute 32% of imperiled crayfish. Despite their conservation importance, little is known about the ecology of …
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Detectability, movement, and population structure of the endangered Candy Darter in Virginia
Minnows and darters are the most imperiled freshwater fish species in North America as a result of habitat degradation and restricted ranges, which often results in isolated populations. The Candy Darter Etheostoma osburni was recently listed as Endangered and may represent a suite of other …
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Genetic effects of persistent population bottlenecks on long-lived organisms with overlapping generations
… population size of 700 is required for this imperiled population to maintain 90% of its observed allelic richness in the next 200 years. In conclusion, bottlenecks can have very different genetic effects on long-lived species with overlapping generations and short-lived species with discrete …
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Feeding Ecology of Invasive Catfishes in Chesapeake Bay Subestuaries
… Shad, American Eel, and river herring, which are imperiled, and blue crab, which support valuable fisheries in Chesapeake Bay. Predation of American Shad, American Eel, and river herring was rare (max predicted occurrence in Blue Catfish diets = 8%), while blue crab was much more common in the …
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Cheap Apocalypse
… that explores how free-market capitalism has imperiled diverse ecologies and the future(s) of every living species in the pursuit of profit maximization. Narrated by a discarded television floating in the Great Pacific Garbage Patch––an enormous amalgamation of garbage which can be seen from …
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Comparative plasticity of rare Pityopsis ruthii and its common congener P. graminifolia
… Pityopsis ruthii (Ruth’s golden aster) is an imperiled endemic perennial confined to boulder crevices along short stretches of the Hiwassee and Ocoee Rivers in Polk County, TN. To investigate plasticity of this species within the context of such change, we used a comparative approach to …
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