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 36 for “"Larval growth"”.
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Nurture is Nature: The Molecular Basis of Caregiver Genotype Effects on Larval Growth and Caste Development in the Clonal Raider Ant
… with different combinations of caregiver and larval genotypes, enabling measurement of IGEs. Therefore, I investigated the effects of caregiver IGEs on larval growth and development by cross-fostering different clonal genotypes of <em>O. biroi</em>. I found that brood phenotypes, including …
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TROPHIC ECOLOGY OF SAILFISH LARVAE IN THE GULF OF MEXICO: AN ANALYSIS OF DIET, PREY AVAILABILITY, PREY QUALITY, AND INFLUENCES ON LARVAL GROWTH
… for billfishes, whose larvae experience high growth rates despite having highly specialized diets, limited foraging abilities, and oligotrophic offshore habitats. Variability in the recent growth of sailfish larvae was compared to environmental, spatial, diet, prey availability, and fatty acid …
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Influence of environmental conditions on the age, hatch dates, and growth of juvenile Atlantic menhaden in the Choptank River, MD
… in the Chesapeake Bay. Factors controlling growth, abundance, and mortality of larval and juvenile menhaden change throughout ontogeny such that larval growth rates could carry over to juvenile growth and survival. The effects of winter thermal conditions on the hatch dates and growth of …
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The Effects of Environmental Variability on the Population Structure of the Eastern Oyster (<i>Crassostrea virginica</i>): A Modeling Study
… The second model, a time-dependent larval growth model, simulates larval growth and mortality. Larval growth rate, which determines the length of the planktonic period, is defined by food concentration, temperature, salinity and turbidity. The larval model includes the effects of …
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Morphological and Biochemical Changes of Sand Dollar Larvae in Response to Variation in Diet and Salinity
<p>Larval growth and development of two sand dollars, <em>Mellita isometra</em> and <em>Dendraster excentricus</em> was investigated by assigning larvae to several single and mixed algal diets, three levels of salinity and salinity-diet combinations in the laboratory. For <em>M. isometra</em>, …
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Mechanistic models of recruitment variability in fish populations.
… of magnitude, or more, between years, and the larval stage is a key determining factor. Fish larvae are born into an extremely variable environment, with high mortality rates, and so it is not surprising that the number surviving to join the adult population is highly variable. This thesis …
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Utilising microalgal mixotrophy to maximise larval nutrition
… One solution to this issue is to develop a larval hatchery; however, the requirement by larvae for large quantities of live microalgae results in high costs, relative to the value of spat.<br/>In this study, three microalgal species: Tetraselmis suecica, Phaeodactylum tricornutum and …
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Growth, survivability, and reproductive effects of pulse-dosed endosulfan on jordanella floridae (florida flagfish) over one complete life-cycle
… The 96 hour continuous exposure LC50 in larval flagfish was 4.35 μg/L; sub-lethal observations included hyperactivity, convulsions, and some axis malformation. The effects of a 4 hour endosulfan pulse-exposure on 7-8 day-old larval growth, reproduction, and survivability were investigated …
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Early Instar Growth and Survivorship in the Common Baskettail Dragonfly <em>Epitheca cynosura</em> (Anisoptera: Corduliidae).
… density treatment had a significant effect on larval growth from day 28 through day 86 (end of the experiment). Larvae from low density treatments had larger head widths and dry masses. The effects observed within the density treatments were likely to have resulted in a cohort split. Those …
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Modeling Food Assemblage Dynamics in Western Mississippi Sound Regarding Eastern Oyster (Crassostrea virginica) Larval Performance
… particle size as a food limitation for emerging larval cohorts resulting in limiting successful recruitment into the reefs (Klein et al. 2024a,b). Utilizing ambient salinity and temperatures outlined in Klein et al. (2024a), simulated food profiles with respect to food size organized into three …
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The Development and Application of a Larval Pallid Sturgeon (Scaphirhynchus albus) Bioenergetics Model
… a lack of wild progeny, little is known of the larval Pallid Sturgeon and their habitat or environmental requirements. To increase knowledge on the larval Pallid Sturgeon’s physiological requirements for growth and survival, the objective of this study was to develop a bioenergetics model to …
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Investigating the interactive effects of ultraviolet-B radiation and pesticides in amphibians
… and UVB had synergistic effects on larval growth; and (4) pesticides can increase the exposure and risk of UVB radiation in amphibians by impairing repair of UVB-induced DNA lesions and UVB avoidance behavior. Adverse effects were observed at environmentally relevant levels of UVB …
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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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Phenotypic Plasticity of Geographically Central and Peripheral Populations of Jefferson Salamanders (Ambystoma jeffersonianum) in Response to Simulated Climate Change
… experiments were done to assess plasticity in larval growth, size at, and time to, metamorphosis, and survivorship in larval Ambystoma jeffersonianum salamanders from geographically core and peripheral populations. These populations were exposed to longer and shorter hydroperiods reflecting …
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Growth and development of larval bay scallops (Argopecten irradians) in response to early exposure to high CO2
… which high pCO2 exposure has severe effects on larval growth and development of bay scallop (Argopecten irradians). Using five experiments varying the timing of exposure of embryonic and larval bay scallops to high CO2, this thesis identifies two distinct stages of development during which …
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Natural History and Ecology of the Flatwoods Salamander, <em>Ambystoma cingulatum</em> on the Atlantic Coastal Plain
… for and inducing breeding migrations, larval growth and developmental rates, metamorph size and emergence, seasonal activity patterns, and conservation considerations. Factors influencing breeding migrations were analyzed Rainfall was the most significant factor affecting breeding …
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Growth and development of larval bay scallops (Argopecten irradians) in response to early exposure to high CO₂
… which high pCO₂ exposure has severe effects on larval growth and development of bay scallop (Argopecten irradians). Using five experiments varying the timing of exposure of embryonic and larval bay scallops to high CO₂, this thesis identifies two distinct stages of development during which …
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Negative phototaxis of mosquito larvae as a potential tool in the rapid biological monitoring of aquatic wastes (Diptera: Culicidae)
… testing--based on negative phototaxis of larval <u>Aedes aegypti</u>--was investigated as a contribution to the search for rapid methods applicable to the field of water pollution control. Zinc and copper were the toxicants tested. All tests were conducted with a standard "synthetic" …
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Distribution, growth, and transport of larval fishes and implications for population dynamics
… dissertation demonstrates the value of combining larval data, collected in the field and the laboratory, with model simulations. In Chapter 2, analyses of field observations of ontogenetic vertical distributions of coral reef fish revealed a diversity of behaviors both between and within families. …
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Determination Of The Essential Functions Of A Conserved Cyclin, Cyclin Y, In Drosophila
… pupal development. The mutant exhibits delayed larval growth and major developmental defects during metamorphosis. Heat shock-induced expression of <i>CycY</i> at different times during development resulted in variable levels of rescue, the timing of which suggests a key function for zygotic …
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