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 21 for “"Right whales"”.
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Birth, death and taxis: North Atlantic right whales in the twenty-first century
<p>Twenty two years of North Atlantic right whale data were analyzed. Several measures indicate reproduction in North Atlantic right whales is in a decline. Calving intervals have increased from about 3.3 years in the 1980's to over 5 years, and the age of first parturition is estimated to be 11 …
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The cost of locomotion in North Atlantic right whales (<italic>Eubalaena glacialis</italic>)
… The population of North Atlantic</p><p>right whales has not recovered following legal protection due to decreased fecundity,</p><p>including an increase in the intercalf interval, an increase in the years to first calf and</p><p>an increase in the number of nulliparous females in the …
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Testing of a standardised protocol for visual health assessment of southern right whales (Eubalaena australis)
Since the late 1960s, southern right whales (Eubalaena australis) have been studied extensively in their coastal calving grounds (including South Africa). These studies have indicated a strong recovery of the species post-whaling. However, in most recent years, a decrease was observed in …
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Visual health assessment of parous female southern right whales (Eubalaena australis) off the southern Cape coast, South Africa
… monitoring of the South African southern right whale population has revealed a decrease in sightings along the coast and an increase of calving intervals within the last few years, causing changes in the species´ demographics causing a decrease in annual population growth rate (6.5% y -1 …
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Acoustic communication in the North Atlantic right whale (Eubalaena glacialis)
… of sound for communication by the North Atlantic right whale (Eubalaena glacialis). The surface active group (SAG) is the predominant social interaction in this species for which use of sound has been documented. Different group compositions in SAGs indicate that both potentially reproductive and …
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The Southern Whale Fishery Company, Auckland Islands
… undertaking and a reduction in the abundance of Right whales in the South Pacific meant that whaling returns were less than estimated. It was hoped that there may be a viable stock in the Antarctic Seas, and this was investigated but no Right whales were found. The Company soon exhausted its …
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Biomechanics of North Atlantic right whale bone : mandibular fracture as a fatal endpoint for blunt vessel-whale collision modeling
The North Atlantic right whale, Eubalaena glacialis, one of the most critically endangered whales in the world, is subject to high anthropogenic mortality. Vessel-whale collisions and entanglement in fishing gear were indicated in 27 (67.5%) of the 40 right whales necropsied between 1970 and …
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Biomechanics of North Atlantic right whale bone : mandibular fracture as a fatal endpoint for blunt vessel-whale collision modeling
The North Atlantic right whale, Eubalaena glacialis, one of the most critically endangered whales in the world, is subject to high anthropogenic mortality. Vessel-whale collisions and entanglement in fishing gear were indicated in 27 (67.5%) of the 40 right whales necropsied between 1970 and …
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Physical controls on copepod aggregations in the Gulf of Maine
… especially for endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this thesis looks at how different characteristics of the GOM circulation fit into these two categories. The first part of the thesis …
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Physical controls on copepod aggregations in the Gulf of Maine
… especially for endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this thesis looks at how different characteristics of the GOM circulation fit into these two categories. The first part of the thesis …
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Effects of added drag on cetaceans : fishing gear entanglement and external tag attachment
… unnaturally. Fishing gear that entangles large whales adds drag, often altering energy balance to the point of terminal emaciation. 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 …
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The environmental factors determining temporal distributions of cetaceans in Mossel Bay, South Africa
… chlorophyll a concentration (mg.m-3) and moon brightness (as % of full) that potentially affect presence patterns within the bay, and several temporal scales (diurnal, monthly, seasonal, annual). The study focused on three whale species: the southern right whale (Eubalaena australis), humpback …
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Effects and added drag on cetaceans : fishing gear entanglement and external tag
… unnaturally. Fishing gear that entangles large whales adds drag, often altering energy balance to the point of terminal emaciation. 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 …
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Comparative analyses of aryl hydrocarbon receptor structure, function, and evolution in marine mammals
… integument samples from living North Atlantic right whales to identify the cDNA sequence for AHR and other genes of physiological importance. Biopsy-derived RNA was found to be of higher quality than RNA extracted from stranded cetaceans, and proved a good source for identifying cDNA sequences …
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Physical processes and zooplankton distribution in the Great South Channel : observational and numerical studies
… an observational study made while following two right whales as they fed on dense patches of the copepod Galanus finmarchicus in the northern GSC; a detailed description of a tightly integrated set of biological and physical observations made in the GSC by means of a new instrument, the Video …
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Mark-recapture statistics and demographic analysis
… described above to data of the North Atlantic right whale (Eubalaena glacialis). The right whales are considered one of the most endangered mammals. The current population size is about 300 in the northwestern Atlantic, and the number is declining. I applied the multi-stage mark-recapture …
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Comparative analyses of aryl hydrocarbon receptor structure and function in marine mammals
… integument samples from living North Atlantic right whales to identify the cDNA sequence for AHR and other genes of physiological importance. Biopsy-derived RNA was found to be of higher quality than RNA extracted from stranded cetaceans, and proved a good source for identifying cDNA sequences …
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Mark-recapture statistics and demographic analysis
… described above to data of the North Atlantic right whale (Eubalaena glacialis) The right whales are considered one of the most endangered mammals. The current population size is about 300 in the northwestern Atlantic, and the number is declining. I applied the multi-stage mark-recapture …
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Towards scalable modern marine ecosystem monitoring
… iconic umbrella species such as North Atlantic right whales, emperor penguins, and coral reef ecosystems, face mounting anthropogenic pressures. Addressing these data gaps requires fundamentally better ocean observation capabilities, yet progress is constrained by the high cost of field …
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Automatic baleen whale detection and 2D localization using a network of unsynchonized passive acoustic sensors
… of North Pacific and North Atlantic right whales (NPRWs, NARWs). In shallow-water channels, the timefrequency representation of the received signal is strongly dependent on source-receiver range, making these impulses ideal candidates for range-based localization. The first step in …
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