Global ETD Search

1	Genetic and endocrine related variability of sea otters, Enhydra lutris / Larson, Shawn Elizabeth. January 2003 (has links) Thesis (Ph. D.)--University of Washington, 2003. / Vita. Includes bibliographical references (leaves 94-106).
2	The Steller sea lion (Eumetopias jubatus) decline and the Gulf of Alaska/Bering Sea commercial fishery Hennen, Daniel Reneau. January 2004 (has links) (PDF) Thesis (Ph. D.)--Montana State University--Bozeman, 2004. / Title from PDF t.p. (viewed on June 12, 2006). Chairperson, Graduate Committee: Daniel Goodman. Includes bibliographical references (p. 189-207).
3	Historical population genetics of Callorhinus ursinus (Northern fur seals) from the Aleutian Islands Fang, Ying January 2009 (has links) (PDF) Thesis (M.S.)--University of North Carolina Wilmington, 2009. / Title from PDF title page (February 16, 2010) Includes bibliographical references (p. 82-86)
4	Incorporating model selection and decision analysis into population dynamics modeling / Ward, Eric John, January 2006 (has links) Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (leaves 127-139).
5	Steller sea lions (Eumetopias jubatus) of Oregon and Northern California : seasonal haulout abundance patterns, movements of marked juveniles, and effects of hot-iron branding on apparent survival of pups at Rogue Reef / Scordino, Jonathan. January 1900 (has links) Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references. Also available on the World Wide Web.
6	A generalized stochastic birth/death population model based on Indian RiverLagoon dolphins Unknown Date (has links) For over a decade, researchers at Harbor Branch Oceanographic Institute (HBOI) have conducted surveys of the bottlenose dolphin (Tursiops truncatus) population of Indian River Lagoon (IRL) in Florida. I have constructed a 4-stage population model using the statistical program R. The model is used to conduct a viability analysis by analyzing the relationship between birth, calf and adult survival rates. The power analysis compares survey frequency to expected confidence intervals in estimating abundance. The sensitivity analysis shows that the population is most sensitive to changes in adult survival, followed by birth rate and calf survival. The model shows a strong chance of viability over a 50 year time span. The population is vulnerable to long periods of decline if birth, calf or adult survival rates fall below certain thresholds. Overall, the model simulates the future impacts of demographic change, providing a tool for conservation efforts. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2014. / FAU Electronic Theses and Dissertations Collection Animal populations -- Estimates Indian River (Fla : Lagoon) Population biology Stochastic processes
7	Population demographics of New Zealand fur seals (Arctocephalus forsteri) McKenzie, Jane, janemckenzie@malpage.com January 2006 (has links) Assessment of trophic interactions between increasing populations of New Zealand fur seals (Arctocephalus forsteri) and fisheries in southern Australia is limited due to a lack of species specific demographic data and an understanding of the factors influencing population growth. To establish species specific demographic parameters a cross-sectional sample of New Zealand fur seal females (330) and males (100) were caught and individually-marked on Kangaroo Island, South Australia between 2000 and 2003. The seals were aged through examination of a postcanine tooth, which was removed from each animal to investigate age-specific life-history parameters. Annual formation of cementum layers was confirmed and accuracy in age estimation was determined by examination of teeth removed from individuals of known-age. Indirect methods of assessing reproductive maturity based on mammary teat characteristics indicated that females first gave birth between 4-8 years of age, with an average age at reproductive maturity of 5 years. Among reproductively mature females, age-specific reproductive rates increased rapidly between 4-7 years of age, reaching maximum rates of 70-81% between 8-13 years, and gradually decreased in older females. No females older than 22 years were recorded to pup. Age of first territory tenure in males ranged from 8-10 years. The oldest female and male were 25 and 19 years old, respectively. Post-weaning growth in females was monophasic, characterised by high growth rates in length and mass during the juvenile growth stage, followed by a gradual decline in growth rates after reproductive maturity. In contrast, growth in males was biphasic and displayed a secondary growth spurt in both length and mass, which coincided with sexual and social maturation, followed by a rapid decline in growth rates. Age-specific survival rates were high (0.823-0.953) among prime-age females (8-13 yrs of age) and declined in older females. Relative change in annual pup production was strongly correlated with reproductive rates of prime-age females and adult female survival between breeding seasons. New Zealand fur seal Kangaroo Island - South Australia New Zealand fur seal - Breeding Marine mammal populations Pinniped otarid remote chemical immobilization darting anaesthesia isoflurane midazolam zoletil tiletamine-zolazepam restraint behavioral response fecundity pregnancy rates progesterone reproduction reproductive failure site fidelity mortality territorial size dimorphism life table ageing growth layer groups re-colonization

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