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 54 for “"Cetaceans"”.
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Developing a cost-effective monitoring strategy for coastal cetaceans
… to further our knowledge on the distribution of cetaceans around Northern Ireland and the surrounding region. These efforts were driven by a need to conserve and protect cetacean species in light of increasing pressures on the marine environment. Four discrete studies were devised to assess …
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Trophic role of small cetaceans and seals in Irish waters
… Atlantic white-sided dolphins are offshore small cetaceans foraging in neritic waters. Differences between the diet of striped dolphins collected in drift nets targeting tuna and stranded on Irish coasts showed a complex foraging behaviour; the diet information shows that although this dolphin …
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Systematics of cetaceans using restriction site mapping of mitochondrial DNA
A phylogenetic study of eleven cetaceans was undertaken using Restriction Endonuclease Maps (RSM) of mitochondrial DNA (mtDNA). One species from the suborder mysticeti (baleen whales) was sampled, and of the ten odontocetes (toothed whales) sampled two were from the family Ziphiidae (beaked whales) …
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Tagging wild cetaceans : investigating the balance between more and less invasive techniques
… provide an incredible window into the world of cetaceans, allowing researchers to track movements across ocean basins and investigate fine-scale behavior deep below the surface. The earliest cetacean tags were Discovery marks developed by the British Colonial Office at the turn of the 20th …
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Effects and added drag on cetaceans : fishing gear entanglement and external tag
… An analog to this is drag from tags attached to cetaceans for research and monitoring. This thesis quantifies the effects of drag loading from these two scenarios on fine-scale movements, behaviors and energy consumption. I measured drag forces on fishing gear that entangled endangered North …
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Effects of added drag on cetaceans : fishing gear entanglement and external tag attachment
… An analog to this is drag from tags attached to cetaceans for research and monitoring. This thesis quantifies the effects of drag loading from these two scenarios on fine-scale movements, behaviors and energy consumption. I measured drag forces on fishing gear that entangled endangered North …
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Genetic Dispersal Patterns in Cetaceans: The Development of Dolphin, Whale, and Porpoise Subpopulations
… been used to assess dispersal patterns within cetaceans. A literature review was conducted on dispersal patterns and population genetics to determine dispersal patterns such as sex-biased dispersal, philopatry, and subpopulations. The papers were examined for theories behind dispersal patterns. …
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Risk of Ship Strike and Noise Pollution to Cetaceans in the Bering Strait
… This same Strait is important habitat for cetaceans, including cetaceans migrating to northern feeding grounds, and cetaceans that remain in the Arctic region year-round. The overlap between shipping routes and cetacean habitat indicates an increased probability of a ship striking a …
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The environmental factors determining temporal distributions of cetaceans in Mossel Bay, South Africa
… mating and calving. Sightings of five species of cetaceans were recorded from shore based locations between February 2010 and August 2014 in Mossel Bay, Western Cape. In this study, we aimed to examine the underlying environmental variables: sea surface temperature (°C), chlorophyll a …
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Cytochrome P450 1A1 and aromatase (CYP19) in cetaceans : enzyme expression and relationship to contaminant exposure
… will aid in understanding the susceptibility of cetaceans to such exposures. Cytochrome P450 1A1 (CYP1A1) induction by planar halogenated aromatic hydrocarbons, including certain polychlorinated biphenyls (PCBs), has been correlated with toxic effects in rodents. CYP1A1 expression was measured in …
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Approaches for assessing the presence and impact of thyroid hormone disrupting chemicals in delphinid cetaceans
… approach to assess neurodevelopment in delphinid cetaceans. Blubber morphology, cytochrome P450 1A1 (CYP1A1) expression in the skin-blubber biopsy, blubber and plasma PCBs, and plasma OH-PCBs were assessed in bottlenose dolphins (Tursiops truncatus). In addition, magnetic resonance (MR) images of …
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Approaches for assessing the presence and impact of thyroid hormone disrupting chemicals in Delphinid cetaceans
… approach to assess neurodevelopment in delphinid cetaceans. Blubber morphology, cytochrome P450 1A1 (CYP1A1) expression in the skin-blubber biopsy, blubber and plasma PCBs, and plasma OH-PCBs were assessed in bottlenose dolphins (Tursiops truncatus).
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The Management and Stewardship of A Cetacean Collection
… 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 Mammal Protection Act of 1972, cetaceans were captured worldwide including in U.S. waters. In the United …
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Characterization of an aryl hydrocarbon receptor from a cetacean : an approach for assessing contaminant susceptibility in protected species
Some cetaceans bioaccumulate substantial concentrations of halogenated aromatic hydrocarbons (HAH) in their tissues, but little is known about the effects of such burdens on cetacean health. 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) and related HAH cause toxicity via activation of the aryl …
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Integrated coastal and ocean management of areas hosting marine mammals a case study in the strait of Gibraltar
… maritime traffic and highly protected species of cetaceans could generate conservational or economic conflict. The current publication applies an integrated management approach in order to improve knowledge of cetaceans, maritime activities, and Whale Watching (WW), as well as to involve key …
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Ocorrência e uso de habitat da baleia-de-Bryde (Balaenoptera edeni Anderson, 1878) (Mammalia: Cetacea, Balaenopteridae) na região de ressurgência de Cabo Frio, RJ
… Marinhos da Região dos Lagos for monitoring cetaceans from a shore base, at Arraial do Cabo, southeastern of Brazil. Resulting of 2816h of effort with 203 B. edeni observed. This study provided a clear picture of the seasonal variation of this whale which had the highest frequency during the …
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A Theoretical Approach To Assessing Annual Energy Balance In Gray Whales (eschrichtius Robustus)
… are nearly impossible to collect on large cetaceans, comprehensive bioenergetic models can give insights on such parameters by combining physiological and ecological knowledge. This model was developed to estimate necessary food intake of gray whales, Eschrichtius robustus, of the Eastern …
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Investigating the relative influence of genetic drift and natural selection in shaping patterns of population structure in Delphinids (Delphinus delphis; Tursiops spp.)
… driver for differentiation, particularly in cetaceans. In this study, patterns of population structure at neutral and functional markers were investigated for both common (Delphinus delphis) and bottlenose dolphin (Tursiops spp.), chosen due to high levels of morphological and ecological …
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