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 24 for “"Newts"”.
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Sexual behaviour and sexual selection in newts
This thesis reports an investigation of the influence of sexual selection on the sexual behaviour of the European smooth newt, Triturus vulgaris, and of the North American red-spotted newt, Notophthalmus Viridescens. Both belong to the family Salamandridae of the amphibian order Urodela. Chapter 1 …
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The Role of Alarm Pheromones in Predation Avoidance By Adult Central Newts, Notophthalmus Viridescens
… system was tested in the field to determine if newts avoid areas marked with conspecific skin extract in a natural environment. Newts avoided traps marked with newt skin extract (NSE), but did not avoid traps marked with water or Plethodon skin extract (PSE). It is not known where the alarm …
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Interactions between Eastern Newts and Wood Frogs in an anthropogenically altered wetland system in eastern Kentucky
… that require a long hydroperiod (e.g., Eastern Newts [<em>Notophthalmus viridescens<em>], American Bullfrogs [<em>L. catesbeianus<em>], and Green Frogs [<em>L. clamitans<em>]). The new members of the amphibian community assemblage are top predators known to consume various amphibian life stages. …
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Establishing a protocol to measure tetrodotoxin (TTX) levels in small bodied newts (genus Lissotriton) in western Europe
… to determine whether TTX can be detected in newts (genus Lissotriton and Icthyosaura) across north-eastern Europe. The study was based on eggs and fresh roadkills collected in England, Scotland, Wales and France. The roadkill samples were collected at a site inhabited by both Lissotriton …
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Adaptive evolution, sex-linkage, and gene conversion in the voltage-gated sodium channels of toxic newts and their snake predators
… defense by various animals, including toxic newts. Snakes have evolved resistance through mutations in voltage-gated sodium channels, the protein targets of tetrodotoxin, sparking an evolutionary arms race between predator and prey. In this dissertation, I describe how genomic rearrangements …
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Functional Equivalency of Created and Natural Wetlands in the Central Appalachians: Reproductive Success, Call Phenology, and Diet Composition of Amphibians
… the diet composition of adult red-spotted newts (Notophthalmus viridescens viridescens ) and compared the selection of prey by newts between created and natural wetlands. Newts were trapped during the spring and summer of 2009 and 2010, and the stomach contents of 149 newts were obtained …
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Phenotypic consequences of adaptive toxin production and resistance in coevolutionary partners
… the other. In the western U.S., toxic Pacific newts (Taricha) are defended by a highly potent neurotoxin. This neurotoxin makes them too dangerous for nearly all vertebrates to consume. Taricha are defended by tetrodotoxin (TTX) which blocks voltage-gated sodium channels (Nav) and inhibits …
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A dream of the sacred
… by bold jack-in-the-pulpit and fire-red newts. Underfoot, stones roll and skitter. Each stone, solid, whole, each, an open eye, feigning sleep. Holding secret its very center. Dream Powerful in its simplicity. One stark picture frame. Like a billboard in an endless landscape, it comes …
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Microhabitat requirements of the great crested newt (<i>Triturus cristatus</i>) in a woodland area
… microhabitat use and ecology of great crested newts within a woodland area in the British Isles and suggest ways of improving measures for conservation. The study was conducted at Epping Forest Field Centre and surrounding deciduous woodland at High Beach, Epping Forest, which is situated to …
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The Structure and Function of Amphibian Skin Bacterial Communities and Their Role in Susceptibility to a Fungal Pathogen
… survey of bacterial communities from bullfrogs, newts, pond water, and pond substrate at a single pond, and newts from multiple ponds. There was variation among amphibian host species and populations in their skin symbionts, and, in a host species-specific manner, amphibian skin may select for …
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Diplostomulum trituri (Trematoda: diplostomatidae) a larval strigeoid trematode in the brain and cranial case of the newt, Notophthalmus viridescens (Rafinesque)
… the neural tissue by their oral sucker. In 150 newts examined from Mountain Lake, Giles County, Virginia, the incidence of infection with <u>D. trituri</u> was 100 percent. The total number of parasites in the brain and surrounding area ranged from 2 to 300. The number of mesocercariae in the …
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The population structure and demography of Triturus cristatus in agricultural landscapes of North-West England
… year to avoid killing or injuring individual newts where populations are affected by development. In contrast land in agricultural production covers 71% of the UK but funding for proactive conservation of the species across this habitat is minimal and very difficult to obtain. This thesis has …
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Response Of Salamanders To Chemical Stimuli From Predators In Natural Habitats
… annulatum, to chemical stimuli from predatory newts, Notophthalmus viridescens, and (3) responses of terrestrial southern red-backed salamanders, Plethodon serratus, to chemical stimuli from predatory ringneck snakes, Diadophis punctatus. In all three experiments, responses to predator …
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Amphibian and plant communities of natural and constructed upland-embedded wetlands in the Daniel Boone National Forest
… 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 similar to those of co-occurring natural wetlands. My objectives were to a) gain a more complete understanding of the …
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Predation of Ringed Salamander Larvae, Ambystoma Annulatum
… (Belostoma), backswimmers (Notonecta), and newts (Notopthalmus). In 1991-92, five larvae and one predator were placed into each of 30 containers and were checked every 24 hours for five days. On each day the number of larvae eaten was recorded, the number of larvae was restored to five per …
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Validating FTA card skin swabs as a source of DNA from wild amphibians
… In total, swabs from 22 individual great crested newts (Triturus cristatus, the most endangered newt in the UK and an important flagship species for conservation) were analysed, and partly directly compared with toe clip samples. For amplification tests, 7 nuclear microsatellite loci and one …
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Effects of Anthropogenic Environmental Stressors on Amphibian Immune Defenses and Host-Pathogen Interactions Across Temperate and Tropical Systems
… In Notophthalmus viridescens (Eastern newts; Birmingham, AL) we found no association between CORT and Bd, and marginal support for a negative association between CORT and body condition. Overall, this research indicates that dermal CORT may indeed play a role in disease, skin bacteriome …
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Using eDNA to construct community assemblages of amphibians at sites infected with Batrachochytrium salamandrivorans in the Netherlands.
… fungus, which only affects salamanders and newts (urodelans), has currently only spread to a few countries in Europe past its native range in Asia. However, Bsal has been shown to cause high mortality rates in some European urodelans and has the potential to spread much further across the …
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Molecular Characterization of Early Dedifferentiation in Newt Forelimb Regeneration
Newts have the incredible ability to regenerate many different organs and tissues as adults, including the limbs. Limb regeneration occurs via the dedifferentiation of stump tissue and the formation of a blastema, which provides the majority of cells for the regenerate. Despite all that we have …
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Evolutionary Patterns of Avian Tetrodotoxin Resistance
… by encountering TTX-bearing prey (such as newts) with those that evolved without such pressure and to make generalizations about molecular evolution in this gene family. This thesis explores patterns of TTX resistance across nine Naᵥ channel paralogs (SCN1A–SCN11A) in 107 bird species. …
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