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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 20 for “"wood frog"”.
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The sublethal effects of 2,4-D dimethylamine on wood frog tadpoles in Saskatchewan
… acid (2,4-D) on tadpoles of the wood frog (Rana sylvatica). Wood frog tadpoles in the first experiment were exposed to 2,4-D amine at 0.1, 1.0 and 100 ug/L in outdoor microcosms. Morphometric measures (total length, snout-vent length (SVL) and wet weight) were taken at metamorphic …
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The Population Genetics Of The Wood Frog, Rana Sylvatica, Across Its Geographic Range
… across the continental-wide range of the wood frog, Rana sylvatica. Levels of genetic differentiation between sampled populations were investigated as was the possible locations of glacial refugia for this species. DNA microsatellites were used as the genetic marker. This study found …
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Assessing the Impacts of Agricultural Land Use on Wood Frog (Lithobates sylvaticus) Presence and Health in Central Saskatchewan
… the more common amphibians in this region is the wood frog (Lithobates sylvaticus), a wide-ranging species that occupies a variety of ecosystems, from forests to prairies to tundra. This makes it an ideal model species to compare results in ecological and toxicological studies. Given anecdotal …
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The role of embryonic risk cues on the life history, morphology and behaviour of the wood frog Lithobates sylvaticus
… if embryos can produce disturbance cues. Using wood frog (Lithobates sylvaticus) embryos, I explored the existence of embryonic disturbance cues and their effects on hatching time, morphology, post-embryonic behaviour and growth during the larval stage, as well as the effect of embryonic alarm …
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Effects of exposure to 17α-ethynylestradiol during larval development on the African clawed frog (Xenopus laevis) and the wood frog (Rana sylvatica)
… transcriptional profiles of the African clawed frog (Xenopus laevis) and the wood frog (Rana sylvatica). To do so, X. laevis were exposed to 0.09, 0.84, or 8.81 µg EE2/L throughout the larval period and early post-metamorphic development (89 d) and R. sylvatica were exposed to 1.08, 9.55, or …
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Body Size And Habitat Shading Influence The Consumptive And Non-Consumptive Effects Of Wood Frog (lithobates Sylvaticus) Tadpoles On Aquatic Invertebrate Communities
… of this study were to quantify omnivory among wood frog (Lithobates sylvaticus) tadpoles, determine their consumptive and non-consumptive effects on invertebrate communities, and investigate whether such effects are mediated by habitat shading and tadpole body size. Lithobates sylvaticus …
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Regulation of the Nuclear Factor of Activated T Cell (NFAT) Family of Transcription Factors in the Freeze Tolerant Wood Frog, Rana sylvatica
During winter, wood frogs (Rana sylvatica) can endure whole body freezing with 65-70% of total body water converted to extracellular ice. As a result, cells experience extensive dehydration when water exits as well as anoxia due to interruption of blood flow. Adapting to such challenges requires …
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Interactions between Eastern Newts and Wood Frogs in an anthropogenically altered wetland system in eastern Kentucky
… by species with short larval periods (e.g., Wood Frogs [<em>Lithobates sylvaticus<em>] and Marbled Salamanders [<em>Ambystoma opacum<em>]). Over the last 25 years, hundreds of wetlands have been constructed within the ridge-top ecosystem as permanent water sources for wildlife (i.e., game …
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Population genetics of wood frogs (Lithobates sylvaticus) in a forested ridge-top wetland ecosystem
… distribution of population genetic diversity of wood frogs in natural ridge-top wetlands and what factors influence this. Genetic data were analyzed for nine microsatellite DNA loci from twenty-five wood frog egg clutches at each of five randomly selected natural wetlands. Overall, genetic …
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Anura of Eastern South Dakota: Their Distribution and Characteristics of Their Wetland Habitats, 1997-1998
… within eastern South Dakota. The chorus frog (Pseudacris triseriata triseriata and P. t. maculata), northern leopard frog (Rana pipiens) and great plains toad (Bufo cognatus) were cosmopolitan in distribution occurring in all 44 counties of eastern South Dakota. The American toad (Bufo …
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Monitoring amphibian populations and the status of wood frogs and boreal chorus frogs in the Kawuneeche Valley of Rocky Mountain National Park
… of egg masses as a state variable for monitoring wood frogs and other pond-breeding amphibians. Specifically, I assessed patterns of detectability in wood frog egg masses and evaluated the statistical power of using counts of egg masses and linear regression to detect trends. In Chapter 1, I used …
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Comparison of herpetofaunal species composition and response to edge on the Camp Dawson Collective Training Area, Preston County, West Virginia
… eastern American toad (Bufo a. americanus), and wood frog (Rana sylvatica) were most common in pitfall arrays; mountain dusky salamander (Desmognathus ochrophaeus), Appalachian seal salamander (Desmognathus m. monticola), and redback salamander were most common from searches. Northern red …
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Micromanaging Freeze Tolerance: The Biogenesis and Regulation of microRNAs in Frozen Frogs
When temperatures plummet below 0°C, the wood frog (Rana sylvatica) freezes up to 65% of its body water in extracellular ice masses, displaying no measurable brain activity, no breathing, and a flat-lined heart. Various molecular mechanisms including microRNAs, a multifunctional group of short …
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Physical and Biological Drivers of Wetlandscape Biogeochemistry
… and abundant amphibian in Delmarva wetlands are wood frog (Lithobates sylvaticus) tadpoles. I found that wood frog tadpole aggregations elevated nutrient recycling, microbial metabolism, and carbon cycling in Delmarva wetlands. These results provide evidence for the functional and biogeochemical …
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The Effects of Neuroendocrine Stress on Larval Development
… energetics, and nutrient oxidation in larval wood frogs. The results show that GC hormones increase metabolism, reduce lipid stores, and increase protein oxidation during metamorphic climax. Chapter three focuses on the effects of GC hormones on immune function and r susceptibility. I found …
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Abiotic Factors Underlying Stress Hormone Level Variation Among Larval Amphibians
… spotted salamander (A. maculatum), wood frog (Rana sylvatica), and grey treefrog (Hyla versicolor). Chapter II examined corticosterone level differences throughout development in A. jeffersonianum and R. sylvatica larvae under field, mesocosm, and laboratory venues. Baseline …
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Amphibian and plant communities of natural and constructed upland-embedded wetlands in the Daniel Boone National Forest
… than co-occurring natural ephemeral wetlands. Wood frog and marbled salamander larvae are found almost exclusively in natural wetlands and green frog larvae and eastern newts are found in constructed wetlands. It is currently unknown whether plant communities at these constructed wetlands are …
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Amphibian Community Composition And Disease Susceptibility In Ridge-Top Wetlands Of The Daniel Boone National Forest
… if this was due to the amplifying effect of wood frog larvae or some habitat characteristic present at natural wetland types. Batrachochytrium dendrobatidis (Bd) was not detected at any of the study wetlands. Overall, results suggest that bat wetlands in the London District are not conducive …
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Structural and Biological Characterization of Antimicrobial Peptides from Rana Sylvatica and Kassina Senegalensis
… three peptides were isolated from two different frog families, eight peptide analogs were synthesized to improve antimicrobial activity, and two peptides were co-incubated for synergistic effects. Two peptides, termed kassinatuerins 1 and 2, from the skin of the African running frog, Kassina …