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 296 for “"amphibians"”.
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Comparative Molecular Systematics of Select Amphibians and Reptiles
… micro-complement fixation (MC'F), in select amphibians and reptiles.
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Abiotic Factors Underlying Stress Hormone Level Variation Among Larval Amphibians
… stress hormones (corticosterone) in larval amphibians. Throughout the following chapters, I examined the effects of several abiotic factors on baseline and stress-induced corticosterone levels in the larvae of four amphibian species: Jefferson salamander (Ambystoma jeffersonianum), spotted …
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Ecology of Two Rare Amphibians of the Gulf Coastal Plain
… of habitat ecology and occupancy for two rare amphibians, Florida Bog Frog (Rana okaloosae) (Chapter 1, 2, and 3) and Reticulated Flatwoods Salamander (Ambystoma bishopi) (Chapter 5), that are both restricted to the Northern Gulf Coastal Plain. Further, for R. okaloosae I examined the influence …
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Systematics and biogeography of amphibians of the African Eastern Arc mountains
Abstract available p. ii
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Physiological and behavioural responses to temperature and humidity in fossorial amphibians
Amphibians have been the focus of research investigating physiological and behavioural responses to temperature and humidity for over two centuries. However, fossorial (i.e., underground-dwelling) amphibians remain comparatively understudied despite the unique environmental pressures that they …
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Flexion and Extension : Studies Employing Muscles of the Shank in Amphibians
Tibialis anticus and peronaeus longus of the frog have been examined by optical and electron microscopy. Sodium and potassium concentrations of these muscles have been determined. Double myograms have been used to compare physiological and pharmacological properties of flexor and extensor and to …
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Observations of the growth of two strains of Trichomonas augusta from amphibians
This study was begun with three purposes in mind. One was to develop a better medium for the cultivation of flagellate protozoans of the genus Trichomonas by varying the viscosity and nutrient content of the constituents. The second was to determine, by rates of division, the effects of various …
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Investigating the interactive effects of ultraviolet-B radiation and pesticides in amphibians
… effects of pesticides and UVB radiation in amphibians. Understanding the potential interaction mechanisms between pesticides and UVB may have important implications in risk assessments and conservation of global amphibian populations. The purpose of this research is to (1) evaluate acute …
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Interactive effects of wildfire and disturbance history on amphibians and their parasites
… abundance, and infection status of 3 native amphibians. In Chapter 1, I used long-term data on wetland occupancy to show the long-toed salamander (Ambystoma macrodactylum) and Columbia spotted frog (Rana luteiventris) were resistant to change during the first 6 years after wildfire, but …
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Interactive effects of wildfire and disturbance history on amphibians and their parasites
… abundance, and infection status of 3 native amphibians. In Chapter 1, I used long-term data on wetland occupancy to show the long-toed salamander (Ambystoma macrodactylum) and Columbia spotted frog (Rana luteiventris) were resistant to change during the first 6 years after wildfire, but …
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Looking into the Past: The Diversification of Amphibians in the Neotropical Savannas
… diversification in the Cerrado savanna using amphibians as a model. Evolutionary patterns were investigated by comparing the phylogeographic and biogeographic history of biome-specific yet widely distributed amphibian species (<em>Chiasmocleis albopunctata, Dendropsophus rubicundulus</em> and …
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Occupancy of Stream-Associated Amphibians within the Interstate 90 Snoqualmie Pass Corridor
Detection of stream-associated amphibians in visual encounter surveys is challenging due to their cryptic nature; however, occupancy models were developed to deal with these detectability problems and provide estimates of occupancy that can also be related to site characteristics. Highway crossing …
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Rapid Expansion and Specialization of the Bitter Taste Receptor Family in Amphibians
In classic sensory literature, bitterness is viewed as an early-warning system for toxic or spoiled foods. In vertebrates, bitterness is detected with a family of intronless G protein-coupled receptors called TAS2Rs. TAS2Rs are well studied in the human and mouse mouth, but recent studies have …
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Validating FTA card skin swabs as a source of DNA from wild amphibians
Amphibians are the most endangered groups of vertebrates, and there is currently an urgent need to implement efficient monitoring schemes based on insights from DNA. However, largely due to their unprotected skin which lacks dead keratinised tissue, current standard techniques for DNA sampling of …
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The status and distribution of terrestrial amphibians in old-growth forests and managed stands
… thesis, I compare the abundance of terrestrial amphibians in old-growth forests and young and mature post-harvest stands. I also examine the habitat features with which they are strongly associated, and contrast these between old growth and second growth to gain insight on the specific effects …
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Temporal and Spatial Trends of the Amphibians, Reptiles, and Mammals of the Relict Ottine Wetlands
… and health. From January 2008 to June 2009, amphibians, reptiles, and mammals of Palmetto State Park and the Ottine Wetlands of south central Texas were surveyed to produce a current mammalian and herpetofaunal inventory and produce estimates of relative abundance, evenness and diversity. I …
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Fitness for the Ark : are zoo bred amphibians ready to go back to the wild?
… viable option for the conservation of threatened amphibians, if the necessary care is taken regarding husbandry protocols. Extreme care should be taken regarding husbandry to fulfil the environmental and behavioural needs of each species. The next stage for this research would be to test if a …
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