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 57 for “"marine mammal"”.
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Modeling and frequency tracking of marine mammal whistle calls
Marine mammal whistle calls present an attractive medium for covert underwater communications. High quality models of the whistle calls are needed in order to synthesize natural-sounding whistles with embedded information. Since the whistle calls are composed of frequency modulated harmonic tones, …
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Drift modelling of marine mammal carcases in coastal waters
… Here, I develop a drift modelling framework for marine mammal carcases in coastal waters. The resulting models were run forwards and backwards in time to provide insights into strategies for environmental monitoring under two scenarios. The first explored the beach search options for carcases …
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Passive Acoustics: A Multifaceted Tool for Marine Mammal Conservation
<p>Marine mammals exploit the efficiency of sound propagation in the marine environment for essential activities like communication and navigation. For this reason, passive acoustics has particularly high potential for marine mammal studies, especially those aimed at population management and …
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Modeling and frequency tracking of marine mammal whistle calls
Marine mammal whistle calls present an attractive medium for covert underwater communications. High quality models of the whistle calls are needed in order to synthesize natural-sounding whistles with embedded information. Since the whistle calls are composed of frequency modulated harmonic tones, …
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Dynamic energy budgets and bioaccumulation : a model for marine mammals and marine mammal populations
… energy can bioaccumulate and harm individuals. Marine mammals are particularly vulnerable because of their large energy requirements, and transfer of energy and toxicants from mothers to their young during gestation and lactation. Dynamic energy budget (DEB) models for energy assimilation and …
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Socio-Technical Perspectives on Digital Photography: Scientific Digital Photography Use by Marine Mammal Researchers
… between technology and scientific practice for marine mammal scientists who use digital photography. Scientists studying marine mammals use a technique called photo-identification to identify individual animals such as whales and dolphins in the wild. This technique involves photographing the …
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Dynamic energy budgets and bioaccumulation : a model for marine mammals and marine mammal populations
… energy can bioaccumulate and harm individuals. Marine mammals are particularly vulnerable because of their large energy requirements, and transfer of energy and toxicants from mothers to their young during gestation and lactation. Dynamic energy budget (DEB) models for energy assimilation and …
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An Assessment of Sea Turtle, Marine Mammal and Seabird Bycatch in the Wider Caribbean Region
<p>Sea turtles, marine mammals and sea birds are vulnerable to higher mortality rates as a direct function of incidental capture (bycatch) in marine fisheries. Their migratory behavior exposes them to multiple fishing gear types and fishing practices and efforts to understand the rates of …
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Telomere Dynamics of Grey Seals (Halichoerus grypus) on Sable Island, Nova Scotia: a Long-Lived Marine Mammal Population Island
… age is well documented, but rarely in long-lived mammals due to sampling difficulty. This study used an established qPCR assay to measure relative telomere length (rTL) in the grey seals (Halichoerus grypus) of Sable Island, Nova Scotia, a population of long-lived marine mammals approaching …
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The Management and Stewardship of A Cetacean Collection
<p>Cetacean, by definition, is a marine mammal of the order Cetacea; a whale, dolphin or porpoise. In light of their social intellect and friendly appearance, cetaceans are used in institutions such as zoos and aquariums as a source of education and entertainment for the public. Before the Marine …
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High-throughput analytical methods for persistent organic pollutants in high-lipid matrices.
… from environmental matrices, such as mammal tissues, have provided a wealth of information regarding contaminant behavior and environmental fate. These POP trends and profiles are unique and often irreplaceable due to difficulties in obtaining marine mammal samples. Historically, …
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Concentrations and Interactions of Selected Elements in Tissues of Four Marine Mammal Species Harvested by Inuit Hunters in Arctic Alaska, With an Intensive Histologic Assessment, Emphasizing the Beluga Whale
Inorganic Hg was localized through autometallography in beluga hepatic and renal light microscopic sections. Metal grains occurred at high densities in kidney cortical tubular epithelium, with lower densities in medullary tubular epithelium. In liver, metal grain deposition showed marked zonation, …
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Comparative analyses of aryl hydrocarbon receptor structure and function in marine mammals
Marine mammals possess high body burdens of persistent organic pollutants, including PCBs and dioxin-like compounds (DLC). Chronic environmental or dietary exposure to these chemicals can disrupt the function of reproductive and immune systems, as well as cause developmental defects in laboratory …
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Elastic sandwich problem: ocean acoustics in Arctic environments
… for many disciplines, where it is essential to marine mammal conservation studies, oil exploration, naval studies, and many other fields. The Arctic environment involves a finite elastic ice layer as the upper boundary of the ocean acoustic waveguide and an elastic half-space seafloor as the …
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Metabolic lipid regulation during developmental stress : fatty acid dynamics in fasting northern elephant seals.
… is a temporally insulin resistant, deep-diving marine mammal reliant on fatty acid oxidation during seasonal fasting. Over the fast, NES females and weaned pups were found to oppositely utilize monounsaturated and saturated fatty acids, while polyunsaturated fatty acids generally increased in …
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Conserving dolphins and fishermen: Combining science and local knowledge to reduce cetacean bycatch
… by fishermen. It threatens the survival of many marine mammal populations globally, and it occurs in nearly every fishing gear type. Despite its widespread occurrence, observations of bycatch are rare, and scientific data on marine mammal bycatch are limited. Difficulties result in developing …
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Lipid studies in breath-hold diving mammals and obese, pre-diabetic mice.
… profiles were examined in several species of marine mammals (and in two tissue types in one marine mammal species), as well as in the skeletal muscle of obese, pre-diabetic mice. The fatty acid composition of the cells (the sum total of intracellular lipid and the fatty acids of membrane …
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Trophic role of small cetaceans and seals in Irish waters
Understanding the role of marine mammals in specific ecosystems and their interactions with fisheries involves, inter alia, an understanding of their diet and dietary requirements. In this thesis, the foraging ecology of seven marine mammal species that regularly occur in Irish waters was …
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Polar Bear (Ursus Maritimus) Foraging Ecology in the Western Canadian Arctic
… rely on sea ice as their primary habitat to hunt marine mammal prey. Due to their position at the top of the Arctic marine food web, polar bear foraging patterns can provide insights on ecosystem structure and function both spatially and temporally. This thesis used quantitative fatty acid …
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Swimming sentinels : climate clues from stranded marine mammals
… recently puzzled by a spate of dead and dying marine mammals. These events are so complicated- influenced by disease, biotoxins, ecosystem changes, and human interaction-that their cause can appear impossible to untangle. Yet a growing body of evidence strongly suggests that climate change has …
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