Thesis (Ph.D.) - James Cook University, 2006. / Appendix 2 (p. 444-454) contains the Research Agreement between the author and the Hopevale Community which governs further research or publications arising from the thesis. Typescript (photocopy). Bibliography: leaves 373-441.

Thesis (M.S.)--University of North Carolina Wilmington, 2009. / Title from PDF title page (January 12, 2010) Includes bibliographical references (p. 64-69)

Understanding the ecology and life history of marine turtle populations is fundamental for their effective conservation, especially for those that are harvested for food. This thesis presents a collection of six chapters that progress from the applied to the pure; conservation and management in the first chapters through to animal ecology in the latter. A variety of contemporary and multidisciplinary techniques are utilised to explore the structure, populations dynamics and ecology of two marine turtle species, the green turtle (Chelonia mydas) and the hawksbill turtle (Eretmochelys imbricata), under harvest in the Turks and Caicos Islands (TCI), Caribbean. The work first focuses on the structure of TCI’s small-scale fishery and the demographics of turtles landed and incorporates nesting seasonality, adult take, satellite tracking and genetic structure to suggest evidence-based legislative amendments. As part of the study of this fishery, this work reports on how the harvest might increase prevalence of disease in green turtles. As an exploration into the ecology of turtle stocks found in TCI, the work then describes and compares in- water immature and adult sex ratios, genetic differentiation and sex biased dispersal. Finally, stomach content and habitat matching, and stable isotope analyses provide insights into the foraging ecology and suggested keystone roles of sympatric green and hawksbill turtles.

Hatchling marine turtles use visual cues to orient from their nest to the sea at night. However, the wavelengths of light that carry this information have not been properly documented, nor do we understand why they are favored. I measured wavelength irradiance at 20 nm intervals between 340 – 600 nm at a dark nesting beach and then, in the laboratory, determined the thresholds of the hatchlings for each λ that evoked a positive phototaxis. In this study, I show that green turtle hatchlings are (i) most sensitive to the shorter (360 – 480 nm) light wavelengths. Those light energies (ii) dominated the available natural lighting at the nesting beach. They also (iii) presented a steep gradient in irradiance between a landward and seaward view, an important cue for orientation. I attribute the phototactic responses to “stimulus filtering”, the outcome of natural selection that optimizes behavioral responses (seafinding) according to their function, as well as when and where they occur. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2018. / FAU Electronic Theses and Dissertations Collection

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Arbetet undersöker grafikkortets lämplighet att tolka L-system i realtid. L-system är ett strängomskrivningssystem som beskriver strukturen hos botaniska former. Lsystem tolkas med hjälp av sköldpaddstolkningen för att få en geometrisk tolkning. För att utvärdera om grafikkortet är lämpat att tolka L-system i realtid har två system implementerats. Det ena systemet tolkar L-system på processorn och det andra systemet tolkar L-system på grafikkortet. Jämförelser har gjorts mellan dessa två system, framförallt av tidsåtgången för att tolka och rendera L-system. Men även minnesmängden som behövs för att realisera båda systemen i olika fall. Resultatet är en algoritm på grafikkortet som kan tolka L-system i realtid under rätt förutsättningar, men slutsatsen är att processorn är mer lämpad för uppgiften. Algoritmen på grafikkortet presterar väl vid hög polygonnivå, men under dessa förutsättningar utförs inte tolkningen i realtid. Vidare minskar algoritmen minnesåtgången på grafikkortet jämfört med algoritmen på processorn.

Sea turtles are large migratory animal stay in the water most of their life time. In the east coast of Taiwan, there is a strong northward Kuroshio current. It is hypothesis that ocean current might play an important role to the migration tracks of sea turtles in the region. To test the hypothesis, two turtle tracks based on Argos records were analyzed. The first turtle moved from Lanyu in the NE direction to Ishigaki Island. The second one moved southward from Dong-Auo, along the east coast of Taiwan, to the southern tip of Taiwan, and then detoured westward across the Taiwan Strait, swum southward along coastal China to Leizhou Peninsula finally. In this study, we analyze data of EASNFS model, drifter tracks, weather buoy records and MODIS sea surface temperature, to explore the relationship between the ocean currents and the migration tracks of sea turtles. The Lanyu turtle seems follow very well with Kuroshio current in the early stage of its migration. The migration matches well with many Argos drifter tracks, and Lagragian drifter of EASNFS model. The probability of this turtle arriving Ishigaki Island is 26% if without other help. There is a turning point, as indicated by the comparison of model and real track. The Lanyu turtle swam hard to correct the migration route in order to reach the final destination. The Dong-Auo turtle track is analyzed together with data of winds, waves and drifters. This turtle migrated southward along the east coast of Taiwan seemly agree with the northeast monsoon wind driven coastal current. The migration route turned west at the southern tip of Taiwan. The turn matches well with the currents indicate by Argos drifters, as well as EASNFS modeling. In additional to the guidance of currents, this migration route also followed the sea surface temperature of 21¢J. In conclusion, this study suggests that turtles migration, in additional to the efforts of swimming and temperature guidance, will take advantage of prevailing currents to reach their final destinations.

<p>Arbetet undersöker grafikkortets lämplighet att tolka L-system i realtid. L-system är ett strängomskrivningssystem som beskriver strukturen hos botaniska former. Lsystem tolkas med hjälp av sköldpaddstolkningen för att få en geometrisk tolkning. För att utvärdera om grafikkortet är lämpat att tolka L-system i realtid har två system implementerats. Det ena systemet tolkar L-system på processorn och det andra systemet tolkar L-system på grafikkortet. Jämförelser har gjorts mellan dessa två system, framförallt av tidsåtgången för att tolka och rendera L-system. Men även minnesmängden som behövs för att realisera båda systemen i olika fall. Resultatet är en algoritm på grafikkortet som kan tolka L-system i realtid under rätt förutsättningar, men slutsatsen är att processorn är mer lämpad för uppgiften. Algoritmen på grafikkortet presterar väl vid hög polygonnivå, men under dessa förutsättningar utförs inte tolkningen i realtid. Vidare minskar algoritmen minnesåtgången på grafikkortet jämfört med algoritmen på processorn.</p>

No description available.

The effects of agricultural development on wood turtles (Clemmys insculpta) were investigated in Quebec during 1994 and 1995. Age structures, growth, and mutilation rates were compared between an agricultural population and a reference site in an undisturbed forest. Turtles in the 0-4 year age class were absent from samples taken at the agricultural site. Overall, 23% less juveniles were encountered at the agricultural site. In addition, relatively fewer adults were captured from the 20+ age class. Shell injuries were twice as common at the agricultural site when compared to the forest site; whereas, limb amputations were twice as frequent at the forest site. Although shell injuries inflicted by predators occurred with similar frequencies at both sites, there were 2.7 times more fractures resulting from anthropogenic sources at the agricultural site. Multiple limb loss occurred only at the forest site. Tail amputations occurred with similar frequencies at both sites. Casts of pleural scute annuli revealed that turtles at the agricultural site had significantly lower growth rates during their second decade of life. Females at the forest site were significantly larger for all measurements recorded; whereas, males differed only with respect to carapace and plastron lengths. Agricultural development may have resulted in reduced growth, recruitment, and predation rates, as well as increased adult mortality.