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 “"amphibian declines"”.
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INFLUENCES OF DISEASE-DRIVEN AMPHIBIAN DECLINES ON ECOSYSTEM STRUCTURE AND FUNCTION IN PANAMANIAN HEADWATER STREAMS
… at large spatial scales. Ongoing, disease-driven amphibian declines may influence the structure and function of stream ecosystems, but little is known of the potential roles of stream-dwelling tadpoles in consumer-resource dynamics, ecosystem functions such as decomposition, and ecosystem-level …
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ENERGY FLOW AND MACROINVERTEBRATE PRODUCTION IN PANAMANIAN HIGHLAND STREAMS: ASSESSING THE IMPACTS OF AMPHIBIAN DECLINES
Amphibian populations around the world have been declining rapidly over the past two decades, particularly in upland regions of the neotropics, where a fungal pathogen that causes chytridiomycosis has decimated many regions. Despite increasing concern over these and other dramatic losses of …
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The Interactive Effects of Multiple Stressors on Lithobates catesbeianus and Anaxyrus americanus
<p>Amphibian populations worldwide have experienced dramatic declines, and many species have already become locally, regionally, or globally extirpated with thousands more being threatened with extinction. These declines have occurred more rapidly in amphibians than any other group of vertebrates, …
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Investigating the interactive effects of ultraviolet-B radiation and pesticides in amphibians
Amphibian populations are decreasing world-wide, which will not only lead to significant biodiversity loss but will also affect the structure and function of the ecosystems. Several causing factors have been proposed, including pesticide contamination and UVB radiation. However, amphibian declines …
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EPIDEMIOLOGIC ANALYSIS OF RISK FACTORS FOR LOCAL DISAPPEARANCES OF NATIVE RANID FROGS IN ARIZONA
… and environmental factors contributing to amphibian declines in Arizona. Risk factors were compared between sites where frogs disappeared (cases) and persisted (controls) using univariate and multivariable logistic regression analyses. Thirty-six percent (117/324) of all sites became cases …
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The presence of amphibian ranavirus in Virginia warm water fish hatchery ponds
Amphibian declines have been occurring world wide over the past several decades. Infectious disease and environmental changes have been implicated as the causative agents in these declines. Fish stocking from hatcheries provides a unique opportunity for organisms, including infectious diseases, to …
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Differences in Gene Expression Responses to Heat Shock Between Warm- and Cool-Adapted Isolates of Batrachochytrium dendrobatidis
… patterns of infection, both between distinct amphibian species and between different climates; this has resulted in inconsistent data on its virulence and pathogenicity. In regions within Bd’s known thermal optimum, amphibian declines are extensive and have resulted in entire species going …
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Life history implications of the mother's choice for a larval habitat. Niche choice and niche conformance in the fire salamander, Salamandra salamandra
… and many species experience drastic population declines or local extinction events. Amphibians are by far the most threatened taxon. They are highly affected by habitat loss, climate change, pollution and emerging infectious diseases such as chytridiomycosis caused by the chytrid fungus …
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Conservation Genetics and Mark-Recapture Monitoring of the Rare Pigeon Mountain Salamander (Plethodon petraeus) within a Highly Restricted Range
<p>Globally, amphibian species are experiencing declines at an alarming rate largely due to habitat loss, disease and climate change. Species with limited ranges are at an elevated risk of a significant decline in population numbers and extinction because of the inability to avoid and recover from …
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The Influence of Environmental Conditions and Co-Occurring Parasites on Blood Physiology in Eastern Hellbenders (<i>Cryptobranchus alleganiensis</i>)
… infectious disease are major drivers of global amphibian declines. Amphibians are particularly susceptible to these factors due to their unique physiology and habitat requirements. Thus, investigating components of amphibian physiology and evaluating the influence of environmental conditions, …
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ASSESSING THE GENOTOXICITY OF TRICLOSAN IN TADPOLES OF THE AMERICAN BULLFROG, LITHOBATES CATESBEIANUS.
Amphibians are particularly sensitive to environmental degradation and, therefore, serve as effective environmental quality indicators. Research has suggested that amphibian declines are exacerbated by manmade environmental toxicants, especially those found in high concentrations in urban areas. …
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Amphibian Community Similarity Between Natural Ponds And Constructed Ponds Of Multiple Types In Daniel Boone National Forest, Kentucky
<p>Amphibians are in a worldwide decline. Among the many causes for amphibian declines, habitat loss and alteration remains one of the most significant. A lack of federal protection for isolated wetlands that provide habitat for unique species has resulted in the loss of breeding habitat and …
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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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Ecological Understanding through Transdisciplinary Art and Participatory Biology
… understanding of the ecological phenomenon of amphibian declines and deformations. In addition through my participatory biology programs, Public Bio-Art Laboratories and Eco-Actions, evidence suggests that non-specialists achieved an increased awareness of the challenges amphibians and …
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Spatial and Temporal Patterns in a Chihuahuan Desert Fish Assemblage
No abstract prepared.
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Ecology of Two Rare Amphibians of the Gulf Coastal Plain
Globally, amphibian species have been in decline and a wide range of factors have been purported to be driving the decline. The Gulf Coastal Plain of Florida has a high degree of endemism and rarity and the biodiversity in the region includes a diverse suite of amphibian species. Degradation of …
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An Investigation of the Effect of Malathion on Adaptive Plasticity of Pseudacris sierra
… important evolutionary consequences for anurans. Amphibians are in decline worldwide, and pollutants are considered to be a major contributor to these declines. Every year 5.2 billion pounds of active ingredients of pesticides are applied worldwide, and these application rates have led to …
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Batrachochytrium dendrobatidis in Central California
… DENDROBATIDIS </italic>IN CENTRAL CALIFORNIA AMPHIBIANS MAJOR PROFESSOR: Eric Schauber Amphibian chytridiomycosis has been identified as a disease responsible for the decline and extinction of many amphibian taxa world wide, but little research has been conducted on the disease in …
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