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 15 of 15 for “"larval period"”.
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Growth and Metamorphosis of the Ringed Salamander
… mean total length of 65.5 mm. The length of the larval period ranged from 228-258 days. Growth throughout the larval period was constant and best explained by the regression of total length on age in days. High correlations were found between mean total length and snout-vent length and between …
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Proximate Causes of Alternative Reproductive Tactics in Blue Ridge Two-Lined Salamanders (Eurycea cf. wilderae)
… in <em>E.</em> cf. <em>wilderae</em> is the larval period, which may be one or two years in length. This thesis explores the proximate causes of ARTs in a population of <em>E.</em> cf. <em>wilderae</em> from the Blue Ridge of North Carolina. The first chapter of this thesis surveys for a …
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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)
… utilized in oral contraceptives, during the larval period on the sexual development, growth, metamorphosis, and 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 …
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Using Mesocosms to Model Optimal Levels of Body Size Variation in Larval Spotted Salamanders (Ambystoma maculatum)
… body size variation in populations of larval salamanders to evaluate these mechanisms. Larval Ambystoma maculatum were raised in mesocosm populations along a continuum of body size variation at both high and low densities. Rates of larval growth, survival, size at metamorphosis, and …
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Predator Out of Place : The Differential Impacts of Native and Non-native Crayfish on Bufo Tadpoles
… shown to alter important fitness components (larval period, mass at metamorphosis, and overall survivorship) of larval anurans. Uncommonly studied predators of tadpoles include crayfish. Both native and introduced crayfish occur in NC. To gain a better understanding of the effect of introduced …
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Variation in Salamander Life History and Community Composition Across an Urban Gradient in Atlanta, Georgia, USA
… urban streams; 2) the environmental drivers of larval period and size; 3) the relationship between clutch size, female size, and degree of urbanization; and 4) changes in plethodontid salamander species richness across an urban gradient, using environmental DNA. I found that 1) drainage basin …
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Possible Effects Of Climate Change On Induced Defenses In Tadpoles
… be affected, resulting in shorter average hydroperiods (the amount of time a pond holds water). Species that live in these ponds will face increased stress due to these environmental changes, which may affect the timing of yearly events and alter community composition. For example, important …
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Quantifying Metagonimoides oregonensis infection distribution and effects among stream salamander hosts
… of infection. This may be due to their long larval period, which results in a longer trematode accrual period. My second study explored the role of host and parasite behavior in driving infection dynamics in this system. I examined both parasite response to host chemical cues and host …
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Environmental drivers of the abundance and distribution of forage fishes on the Northeast US shelf, with a particular emphasis on northern sand lance
… Lagrangian particle tracking models simulating larval sand lance transport. Connectivity varies among these hotspots with Georges Bank and Stellwagen Bank having notable retention while the Great South Channel relies on larvae from other hotspots. Retention on Stellwagen Bank and Georges Bank …
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Food Habits and the Utilization of Drift Organisms by Larval Fishes in the Middle Fork of Drake's Creek, Kentucky
… drift and a total of seventeen taxa, including larval fish, were identified in the stomach analysis. Eggs, rotifers, hydracarina, and diptera represented the greatest component of the drift comprising 34%, 32%, 8%, and 6%, respectively. The major organisms observed in the gut analysis included …
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Environmental drivers of the abundance and distribution of forage fishes on the Northeast US shelf, with a particular emphasis on northern sand lance
… Lagrangian particle tracking models simulating larval sand lance transport. Connectivity varies among these hotspots with Georges Bank and Stellwagen Bank having notable retention while the Great South Channel relies on larvae from other hotspots. Retention on Stellwagen Bank and Georges Bank …
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The Interactive Effects of Multiple Stressors on Lithobates catesbeianus and Anaxyrus americanus
… effects of multiple stressors on two species of larval amphibians. The study investigated the individual and combined effects of a major environmental contaminant (Glyphosate, commercial Roundup ®), increased temperatures, and predatory cues on survival, growth, and development of tadpoles from …
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The Effect of Acute Low pH on Feeding and Locomotor Activity of Larval Fathead Minnows, Pimephales promelas
… been the primary focus of research. However, the larval stage is potentially the most sensitive to toxicity. It is also important ontogenetically as several crucial development thresholds, such as first feeding, occur during this period. The impact of acute low pH on feeding performance was …
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Alternative life history strategies in the West African reed frog, Hyperolius nitidulus
… reproductive capacity and a long reproductive period triggered the working hypothesis of two alternative life-cycle strategies favouring aestivation or immediate reproduction. The hypothesis for the life-cycles of Hyperolius nitidulus that differed from the commonly assumed reproductive …
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The biology of the tobacco flea beetle in Virginia: Epitrix parvula (F.) (Coleoptera: Chrysomelidae)
… from hibernation at Chatham, Virginia, over a period of 70 days. The eggs of the tobacco flea beetle are normally deposited in cracks or small depressions in the soil near the base of its food plant. A female of the overwintering brood deposited 154 eggs during her oviposition period of 53 …