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 49 for “"Anurans"”.
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Visual Opsin Diversity in Anurans
<p>Among major vertebrate groups, anurans are understudied with regards to their visual systems and how they function. This study sampled North American anurans representing diverse evolutionary and life histories and which likely possess visual systems adapted to meet different ecological needs. …
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Regulation of Seat-patch Water Potentials in Anurans
… findings indicate a physiological mechanism in anurans to control water potential of seat-patches that has not previously been reported in the literature.
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Non-Ranid Anurans of the Mio-Pliocene Gray Fossil Site, Tennessee
… frontoparietal, and last sacral vertebra. Anurans identified include <i>Scaphiopus wardorum</i>(extinct spadefoot toad), <i>Bufo terrestris</i>(southern toad), <i>B.</i> cf. <i>B. marinus</i>(giant neotropical toad), three morphotypes of <i>Hyla</i>(tree frogs), and <i>Pseudacris</i> cf. …
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Information use in anurans: how conspecifics and predators influence reproductive decisions
The student, Valerie Buxton, submitted this Dissertation for approval on 2017-03-24 at 10:47.
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Gonadal histology and reproductive steroidogenesis of anurans exposed to potential endocrine disrupting contaminants
… developmental abnormalities observed in larval anurans may be due at least in part to impacts on the hypothalamic-pituitary-gonadal axis. The present studies investigate the effects of exposure to environmental contaminants including DDT and atrazine on the development, gonadal histology and …
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Diversity and ecology of anurans at selected streams in Taman Negara Johor Endau Rompin, Malaysia
… Encounter Survey (VES) method. Twenty species of anurans, belonging to 15 genera and five families, were documented in this study. Ranidae is the richest families, followed by Bufonidae, Microhylidae, Dicroglossidae and Rhacophoridae. In addition, an updated checklist of anuran fauna has been …
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An Invasive Species as a Threat to Native Biodiversity: Larval Competition Between Native Anurans and an Invasive Treefrog
… further westward, possibly impacting native anurans at multiple life stages. In anurans, competition at the larval stage can decrease adult fitness through slower development and smaller size at metamorphosis, ultimately decreasing recruitment rates. To examine the potential impacts of <em>O. …
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Nuclear Characteristics of Cells and Organisms Exposed to Agrochemicals Contaminating Aquatic Ecosystems
… developed cytogenetic technique for use in anurans. The primed in situ labeling (PRINS) technique was applied to localize a specific developmentally important DNA sequence in anuran chromosomes. This technique has the potential to be an important tool in assessing developmental nuclear …
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Demonstration of pheromonal activity in the breeding glands of dwarf African clawed frogs (Hymenochirus sp.)
<p>Anurans rely mainly on vocalizations for mate attraction while urodeles rely mainly on pheromones. However, the presence of breeding glands suggests that anurans may also communicate with pheromones during reproduction. Previous studies have shown that male Hymenochirus sp. are able to attract …
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Analyzing anuran diversity in urban and rural wetlands using frog call citizen science data
… was a difference in diversity and abundance of anurans in urban wetlands compared to rural wetlands in the Ridge and Valley ecoregion. A Hutchenson’s t-test and a Mann-Whitney U test found that the diversity scores of the two groups were not equal, with the rural wetlands having significantly …
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Functional Equivalency of Created and Natural Wetlands in the Central Appalachians: Reproductive Success, Call Phenology, and Diet Composition of Amphibians
… compared the occupancy and detection of calling anurans in created wetlands relative to natural wetlands to assess temporal calling patterns. Five-minute, ten-minute, and broadcast call surveys were performed at 24 wetlands throughout the Central Appalachians once every month from March through …
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Effects of Anthropogenic Light and Noise on Anuran Breeding Behavior
… animals, little attention has been given to anurans and the effects artificial light at night and anthropogenic noise have on their behavior. This study investigated the effects of artificial light at night and anthropogenic noise on anuran breeding systems in eastern Texas. Specifically, …
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Tests of Functional Equivalence Among Aquatic Predatory Vertebrates
… I specifically focused on the response of larval anurans to (i) variation in the identity of predator species, (ii) variation in trait characteristics possessed by predators and (iii) variation in the total biomass and density of predators present. I found that most predator species differed in …
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Helmintos de populações simpátricas de algumas espécies de anfíbios anuros da família Leptodac tylidae
… comparing parasitism in sympatric populations of anurans related phylogenetically. Necropsies were carried out on 170 specimens, representing the following species of anurans: Leptodactylus ocellatus (Linnaeus, 1758), L. sibilatrix (Wied, 1824), L. mystaceus (Spix, 1824) L. mystacinus (Burmeister, …
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Changes in gall bladder bile throughout development in Rana catesbeiana
… Because no information relative to change in anurans is available during this period, particular emphasis is placed upon the examination of individuals during metamorphic climax.
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Molecular cloning, peptide synthesis and bioactive assessment of a skin defensive peptide, QUB-3117 from the skin secretion of Rana schmackeri
Anurans are the largest group of amphibian and widely distributed in the world. The skin secretion of anurans has been considered as potential candidate for drug development due to its crucial role in protecting from environment. To date, abundant biologically active compounds have been …
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A Comparison of Current Anuran Monitoring Methods with Emphasis on the Accuracy of Automatic Vocalization Detection Software
… a variety of methods are available to monitor anurans, and little standardization of methods exists. New methods to monitor anurans have become available over the past twenty years, including PVC pipe arrays used for tree frog capture and Automated Digital Recording Systems (ADRS) used to …
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Factors Promoting Variation in Feeding Morphology of Larval Southern Toads (Bufo Terrestris)
Larval anurans exhibit morphological plasticity in response to environmental conditions. However, the effect of the environment on morphological traits associated with feeding has been understudied. The purpose of this study was to: 1) determine if diet composition and feeding behavior affect …
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Ecological Assembly of Leaf-Litter Anuran Communities Across a Neotropical Land-Bridge Archipelago
… underlie the community assembly of leaf-litter anurans on a Neotropical archipelago. I combined experimental and observational approaches to: first, identify patterns of body size variation in leaf-litter anurans; second, assess how coloration and body size variation in a territorial and common …
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Amphibian Habitat Usage of Two Restored Bogs in Shady Valley, Johnson County, Tennessee.
… throughout the study sites. Seven species of anurans, Bufonidae, Hylidae, and Ranidae and nine species of caudates in the families Plethodontidae, Ambystomatidae and Salamandridae were identified. Fourteen of the 16 species were found within Orchard Bog.</p><p>Data collected can be used to …
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