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 16 of 16 for “"Blubber"”.
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Approaches for assessing the presence and impact of thyroid hormone disrupting chemicals in delphinid cetaceans
Cetacean blubber is a primary site for lipid storage, which the animal utilizes during periods of energetic stress. It is important to understand how the blubber responds to factors such as ontogeny, water temperature, reproductive status, and nutritional state because blubber is also the primary …
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Approaches for assessing the presence and impact of thyroid hormone disrupting chemicals in Delphinid cetaceans
Cetacean blubber is a primary site for lipid storage, which the animal utilizes during periods of energetic stress. It is important to understand how the blubber responds to factors such as ontogeny, water temperature, reproductive status, and nutritional state because blubber is also the primary …
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High-throughput analytical methods for persistent organic pollutants in high-lipid matrices.
… for lipid-rich matrices, such as marine mammal blubber (Weddell seal Leptonychotes weddelli and bowhead whale blubber Balaena mysticetus) and whale earwax (blue whale Balaenoptera musculus), were developed and emphasized improvements on sample preparation for the analysis of organic pollutants. …
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Thyroid hormones and their receptor gene expression as biomarkers of endocrine disruption in harbour seals (Phoca vitulina)
… exhibited a contaminant-related increase in blubber TRa and a decrease in circulating total thyroxine (TT4) concentrations. Our TRa expression results provide evidence of contaminant-related disruption of TH action at the Ievel of regulation of gene expression. Our findings of a metabolically …
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Characterising fat tissue structure and function in response to hypoxia in grey seals, an animal model of extreme fat deposition and mobilisation, using novel <i>in vivo</i> and <i>in vitro</i> approaches
… I hypothesised that oxygen availability in blubber will be affected by increasing tissue depth and adiposity. In chapter 2, I measured partial pressure of oxygen (pO<sub>2</sub>) and temperature <i>in vivo</i> at different blubber depths in healthy juvenile grey seals. Adipose tissue …
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Effects of weaning age on body composition and growth of ex situ California sea lion (Zalophus californianus) pups
… changes in body composition were estimated using blubber depth measurements and deuterium oxide dilution to determine if weaning age had an effect on subsequent pup development and growth. Blood urea nitrogen and blood glucose levels were observed for their response to changes in body condition, …
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A Theoretical Approach To Assessing Annual Energy Balance In Gray Whales (eschrichtius Robustus)
… gray whales, extent of their feeding season, and blubber depth distribution) using morphometric data, energetic costs, and food assimilation according to age and gender specific requirements. Food intake rates for gray whales of varying maturity and gender were then estimated based on FMR and …
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Approaches to understanding the cumulative effects of stressors on marine mammals.
… This study focused on the POP burden within the blubber of three females (two adults and one juvenile), one of which had a Bcell lymphoma. POP blubber concentrations from different life stages were used to assess the lifetime POPs burden. The juvenile porpoise had the highest contaminant burden …
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The auditory system of the minke whale (Balaenoptera acutorostrata) : a potential fatty sound reception pathway in a mysticete cetacean
… a large, well-formed fat body extending from the blubber region to the ears and contacting the ossicles. Although odontocetes, or toothed whales, are thought to use specialized “acoustic fats” for sound reception, no such tissues had been described for mysticetes to date. Our study indicates that …
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The auditory system of the minke whale (Balaenoptera acutorostrata) : a potential fatty sound reception pathway in a mysticete cetacean
… a large, well-formed fat body extending from the blubber region to the ears and contacting the ossicles. Although odontocetes, or toothed whales, are thought to use specialized "acoustic fats" for sound reception, no such tissues had been described for mysticetes to date. Our study indicates that …
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The cost of locomotion in North Atlantic right whales (<italic>Eubalaena glacialis</italic>)
… First, the influence that</p><p>changes in blubber thickness has on the buoyancy of these whales was investigated</p><p>by comparing the descent and ascent glide durations of individual whales with differ-</p><p>ent blubber thicknesses. Next, the depth of surface dives made by animals of …
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Investigating the effects of persistent organic pollutants (POPs) on insulin-like growth factor 1 (IGF-1) in grey seals
… during suckling and again during fasting and blubber explants were sampled to determine POP concentrations of each pup.<br/><br/>A scoping review was conducted to establish a consensus on the existing scientific literature investigating the effects of POPs on IGF-1 and related hormones, which …
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Behavioral choices of male humpback whales (Megaptera novaeangliae) on the Hawaiʻian wintering grounds
… whales do not feed during this time; their blubber layer decreases in thickness from January to April as their energy is directed towards reproductive efforts and their fat reserves are metabolized for energy (Nishiwaki 1959, Dawbin 1966, Chittleborough, 1965). The objective of this thesis …
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Halogenated 1'-methyl-1,2'-bipyrroles (MBPs) in the northwestern Atlantic
… isotope analyses on MBPs isolated from dolphin blubber show that these compounds are dramatically enriched in 15N relative to other biosynthetic organic compounds. This enrichment is likely a signal imparted during biosynthesis, and may assist in elucidating the organism(s) and mechanism(s) …
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The Proteomic Response of Northern Elephant Seal (<i>Mirounga Angustirostris</i>) Pups to Physiological Stress During Development
… such as decreased urine production and increased blubber reserves. The stressors experienced from learning to dive for the first time are also stressors that they will experience frequently as an adult and for which they have evolved adaptations. The purpose of this study was to understand the …