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 20 for “"early-life stage"”.
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Abundance and Distribution of Early Life Stage Blue Crabs (Callinectes sapidus) in Lake Pontchartrain
… spatiotemporal variation in the abundance of early life stage blue crabs (Callinectes sapidus). Collections were made using a 1 m2 throw trap and data showed that C. sapidus numbers varied over time and among sites. Two recruitment events occurred during the study. During the first recruitment …
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Influence of Early Life Stage Hatchery Enhancement Practices on Maternal Reproductive Investment in Coho Salmon (Oncorhynchus kisutch)
… investment is predicted to be tied to early life-history conditions through developmental programming, creating the potential for mismatches between hatchery-origin reproductive phenotypes and the demands of natural environments. I quantified maternal reproductive traits in 171 mature …
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Untersuchungen zur Genotoxizität in Fischen und Fischzellen mit der Einzelzell-Gelelektrophorese (Comet Assay) - Möglichkeiten und Grenzen im Umweltmonitoring -
… bei belasteten Fischen und Fischzellen, Early Life Stage Tests mit dem Zebrabärbling sowie vergleichende Freilandstudien mit unterschiedlichen Fischarten durchgeführt. Diese zeigten, daß die mit dem Comet Assay abgebildeten Effekte im Bereich vielfältiger, biologisch faßbarer Wirkungen …
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Impacts of Oil Exposure During Early Life Development Stages In Sheepshead Minnows (<i>Cyprinodon variegatus</i>) Under Different Environmental Factors
… oil and suboptimal environmental factors during early life stage development of fish is still largely unknown. The objective of this project was to investigate the impacts of exposure to crude oil in combination with varying environmental stressors on <em>Cyprinodon variegatus</em> survival, gene …
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Ökotoxikologische Untersuchung und Bewertung verschiedener Kompartimente in kleinen Fließgewässern mit Hilfe von Zellkulturen sowieEmbryonen und Larven des Zebrabärblings (Danio rerio)
… und Sediment der beiden Fließgewässer in einem Early Life Stage-Test auf ihre akute bzw. subakute Embryotoxizität zu untersuchen. Neben klassischen Parametern wie Mortalität und Schlüpfrate wurden auch cytopathologische Veränderungen in der Leber der Frühstadien berücksichtigt. Die Kombination …
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The effects of metal contamination on larval white sturgeon in the upper Columbia River
… the population, despite evidence of spawning and early larval survival in the wild. Early life stage white sturgeon are among the most sensitive of aquatic species to copper. The UCR has been contaminated with metal laden slag and liquid effluents from smelter and mining activities, resulting in …
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Stoffwechselenzyme und ultrastrukturelle Veränderungen in Leber und Gehirn von Bachforelle und Bachschmerle als Biomarker zur Erfassung von Umweltschadstoffen
… Veränderungen zu korrelieren waren. In Early Life Stage-Untersuchungen mit dem Zebrabärbling wurden teratogene Wirkungen des PAH-Cocktail nachgewiesen werden, wobei die Stoffwechselenzyme in einem vergleich-baren Sensitivitätsbereich mit wichtigen biologischen Endpunkten der …
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The Curious Poisoned Weed: Poison Ivy Ecology and Physiology
… tools for use in poison ivy. I found that the early life stage of seedling emergence is a critical linchpin in poison ivy establishment due largely to herbivore pressure from large grazers. I also describe the multifaceted relationship between poison ivy and avian frugivores that not only …
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Patterns and causes of population subdivision in the marine environment
… capabilities as presumed by their diverse early-life stage characteristics, and were sampled over multiple habitats at two geographical scales. A total of 1640 individuals (mean 168/species) were surveyed at 63 species-specific and 10 cross-amplified microsatellite loci (mean 9.1/species). …
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Zebrafish cardiovascular cDNA microarrays : expression profiling and gene discovery in embryos exposed to 2,3,7,8-Tetrachlorodibenzo-ρ-dioxin
… pericardial and yolk sac edema, and early life stage mortality. However, the mechanism of TCDD cardiovascular embryotoxicity is poorly understood. The primary goal of this thesis was to identify TCDD-responsive genes likely to be involved in processes of toxicity. We constructed …
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Comparative Ecology of Juvenile Striped Bass and Juvenile Hybrid Striped Bass in Claytor Lake, Virginia
… weight, and lipid index values were low, but nearly equivalent for both striped bass and hybrid striped bass throughout this study. Overwinter starvation of smaller (< 150 mm total length) striped bass was observed for the 2001-2002 sampling season. Predation upon stocked fingerlings was not …
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EFFECTS OF ANTIMICROBIAL COMPOUNDS ON EARLY LIFE STAGES OF CANADIAN FISH SPECIES
… MIT) antimicrobial compounds to early-life stages (ELS) of three freshwater fish species: rainbow trout (Oncorhynchus mykiss), lake trout (Salvelinus namaycush), and white sucker (Catostomus commersonii). The overarching goal was to characterize species-specific responses to these …
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EFFECTS OF ANTIMICROBIAL COMPOUNDS ON EARLY LIFE STAGES OF CANADIAN FISH SPECIES
… MIT) antimicrobial compounds to early-life stages (ELS) of three freshwater fish species: rainbow trout (Oncorhynchus mykiss), lake trout (Salvelinus namaycush), and white sucker (Catostomus commersonii). The overarching goal was to characterize species-specific responses to these …
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Towards an understanding of the developmental zebrafish (Danio rerio) proteome and impacts of age-specific sensitivities with a model toxicant.
… to reduce inconsistencies among future studies. Early life stage zebrafish have gained popularity as an animal alternative with incorporation into standardized methods (such as Organisation for Economic Cooperation and Development test guideline no. 236) to become arguably the most important …
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The effect of turbulence on survival, dispersal, and swimming behavior of grass carp eggs and larvae
… of increasing capture and mortality rates during early life stages (i.e. eggs and larvae stages) when they are more susceptible to damage via enhanced flow turbulence levels and altered flow conditions. In order for these alternative strategies to be effective, is necessary to study the physics …
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A tale of two grasses: Seed production has small & potentially positive effects on seed & seedling traits of squirreltail grasses, but Thurber’s needlegrass resists farming
… of farming affected plant traits. We focused on early life-stage phenotypic traits that are known to affect establishment and survival, including seed mass for both species, and emergence likelihood, emergence times, root allocation, and root characteristics for Elymus sp. Seed was harvested …
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An assessment of endocrine disrupting potential of a New Zealand pulp and paper mill effluent using rainbow trout Oncorhynchus mykiss and mosquitofish Gambusia affinis
… mykiss were utilised in a combination of early life stage and juvenile (+1 year) long- and short term exposures. Exposure of rainbow trout eggs to 15% (v/v) effluent until 10.5 months of age had no effect on fertilisation, hatching success, time to hatch, time to swim-up, juvenile …
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Effects of endocrine disruptors in zebrafish (Danio rerio) as revealed with the fish sexual development test
… the existing OECD test guideline 210, the fish early life-stage toxicity test as an OECD guideline. The main idea is to establish an in vivo test for EDCs, which is relatively straightforward, cheap and on the one hand more rapid than full life-cycle tests, but, on the other hand, more sensible …
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Post-settlement processes and early life history dynamics of zebra mussels (Dreissena polymorpha) in the Hudson River estuary
… events and processes that occur to visible adult stages, particularly those of economically important species, in most cases we know very little or nothing about processes occurring to early life history stages. One of the main barriers to our understanding is a lack of empirical data on young …