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 56 for “"Ecotoxicology"”.
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Ecotoxicology of Natural and Anthropogenic Extreme Environments
<p>Reactive oxygen species (ROS) are produced endogenously in all aerobes and are induced by environmental stressors. ROS oxidize and disable essential cellular components such as DNA, proteins, and lipid membranes. Exposure to metals, polycyclic aromatic hydrocarbons (PAHs), and some pesticides …
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Ecotoxicology of marine biotoxins in bivalve shellfish
A small proportion of harmful algae produce toxins which are harmful to human health. Strict monitoring programmes are in place within Ireland and the EU to effectively manage risk to human consumers of shellfish species that have accumulated marine biotoxins in their tissues. However, little is …
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Behavioural ecotoxicology of the brown shrimp, Crangon crangon : changing colour in polluted environments
The brown shrimp, Crangon crangon has a great ecological value in UK estuaries and coastal areas and it is also a commercially important species. It utilizes chromatophores (specialized cells containing pigments) to match its background, changing its colour either from pale (pigments contracted) to …
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Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities
This thesis explores the ecological impacts of legacy arsenic contamination on Cladocera (Branchiopoda, Crustacea) from historic gold mining in Yellowknife lakes (Northwest Territories, Canada) using a paleo-ecotoxicological approach. I examined Cladocera subfossils preserved in the modern and …
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Ecotoxicology and ecophysiology of mysids, with special reference to copper toxicity in Praunus flexuosus
Toxicity of dissolved copper was examined in a common coastal mysid population {<i>Praunusflexuosus</i>}. The life cycle and ecophysiology were studied under natural conditions throughout the year, and responses to dissolved copper were determined in the laboratory. Pronounced and ontogenic …
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Linking individual-based models and dynamic energy budget theory : lessons for ecology and ecotoxicology
In the context of ecological risk assessment of chemicals, individual-based population models hold great potential to increase the ecological realism of current regulatory risk assessment procedures. However, developing and parameterizing such models is time-consuming and often ad hoc. Using …
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Ecotoxicology and environmental education in the development of a turtle conservation program in Southeastern Tennessee
… partnership expanded its initiative to include ecotoxicology and environmental education components. The goals of these components were three-fold. The first objective was to determine the presence and concentration of persistent organic pollutants (POPs) in the plasma of a riverine turtle …
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The fathead minnow embryo as a model for the development of alternative testing methods in ecotoxicology.
The fathead minnow, Pimephales promelas, a small cyprinid from North America, is widely used as laboratory test fish. In the present study, rearing and breeding conditions for the fat-head minnow were optimized in our laboratory to produce eggs on a regular basis for testing. Firstly, these eggs …
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Life on the edge: exploring the effects of urbanisation on the foraging ecology and ecotoxicology of caracals
… edge, I investigated the foraging ecology and ecotoxicology of a highly adaptable medium-sized carnivore, the caracal (Caracal caracal), utilising both natural and transformed landscapes around the rapidly growing city of Cape Town, South Africa. Through a combination of scat analysis (n = 654 …
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Development of a rapid Hormosira banksii bioassay using chlorophyll a fluorescence
… the use of chlorophyll a fluorescence in marine ecotoxicology has been limited and this is especially true of macroalgal ecotoxicology. The primary objective of this thesis was to develop and describe a bioassay protocol that uses improvements on past macroalgal assay techniques to allow the …
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Non-lethal methods for assessing the health and status of fish species of conservation concern.
… nonlethal methods for studying the ecology and ecotoxicology of endangered species. The two model-organisms used in this dissertation are the Alligator Gar Atractosteus spatula, a long-lived apex predator threatened by habitat loss and harvest oriented fishing, and the Longnose Gar Lepisosteus …
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Environmental risk assessment and human pharmaceuticals: limitations and future improvements
… working in the field of risk assessment and ecotoxicology of pharmaceuticals in order to establish expert opinion in the area; (3) to establish whether bioinformatics databases can be used as a potential tool to aid ecotoxicological tests for use in ERAs. The scientific literature was data …
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Molecular docking and geographical information systems as tools to assess the potential impact of veterinary medicines on non-target organisms and the environment
… potentially having additive effects. Traditional ecotoxicology tests are used to determine the lethal and sometimes reproductive effects on freshwater and terrestrial organisms. However, organisms used in ecotoxicology tests can be unrepresentative of the populations that are likely to be exposed …
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Eisenia hortensis Detects Chemesthetic Irritants through TRP Channels
… the detection of chemical irritants. Based on a ecotoxicology soil sampling method which expels earthworms with allyl isothiocyanate, a common Transient Receptor Potential 1 (TRPA1) channel agonist, we hypothesized that earthworms possess TRPA1-like channels. We examined whether the earthworm …
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From Ecological Epitome to Medical Model: An investigation into Applications for the use of Daphnia in Heart Science.
… a novel and more efficient technique for aquatic ecotoxicology, where visual observation or films of the same are currently used.
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The effects of dietary selenomethionine on the escape behaviours of Fathead Minnows
… the musculature and sensory systems. Behavioural ecotoxicology, a more sensitive study of toxicity, has also provided evidence that sublethal concentrations of selenium are having measurable impacts, such as negatively affecting swimming behaviours, in real-world ecosystems. In this thesis, I …
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Understanding the impacts of antipsychotic pharmaceuticals on behaviour in fish
… the development of the field of behavioural ecotoxicology. Behavioural sensitivity is thought to serve as an ‘early warning sign’ of underlying physiological changes which may not manifest acutely. Nevertheless, if environmental responsiveness is altered at sublethal levels through behaviour …
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Toxicity assessment of pesticides and biopesticides on wild and managed bees (Hymenoptera, Apoidea), and richness evaluation in mediterranean and tropical agroecosystems
… integrated and organic management. Keywords: ecotoxicology; social bees; solitary bees; lethal effects; sublethal effects; essential oils; management; almond; mango exposure; integrated pest and pollinator.
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Xenobiotic metabolism and zebrafish (danio rerio) larvae
… of this organism to toxicity testing and ecotoxicology. Genes similar to mammalian cytochrome P450 (CYP) 1A1, CYP2B6, CYP3A5 and UDP-lucuronosyl-transferase (UGT) 1A1 were demonstrated to be expressed during normal embryonic development, with increased expression post hatching in Wik …
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Mercury Bioaccumulation and Adverse Reproductive Effects in Snapping Turtles Inhabiting a Historically Contaminated River
… reduce reproductive success. Unfortunately, most ecotoxicology studies euthanize animals to quantify the concentrations of Hg bioaccumulation and in doing so eliminate the ability to relate Hg accumulation to observed effects. The development of non-destructive sampling techniques is a critical …
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