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 20 for “"Otters"”.
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The presence, diet and relative abundance of otters (Carnivora: Mustelidae) in Northern Namibia
Four species of otters (Carnivora: Mustelidae) are known to occur in Africa: Eurasian otter Lutra lutra, spotted-necked otter Hydrictis maculicollis, African clawless otter Aonyx capensis and the Congo clawless otter Aonyx congicus. The African clawless and Spotted-necked otters are known to occur …
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Vocalizations of North American River Otters (<i>Lontra canadensis</i>) in Two Human Care Populations
… the vocal repertoire of North American river otters (<em>Lontra canadensis</em>). This indicator species is cosmopolitan yet elusive, making recordings methodologically difficult in the wild. Therefore, this exploratory study uses video and audio recordings of two populations of North American …
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Problem solving and tool use in three species of otter
Sea otters are well known tool users, yet the cognitive capacities of other otter species have been sparsely studied. Precedent exists for non-tool using species closely related to native tool users to display comparable abilities under experimental conditions. The social intelligence hypothesis …
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Conservation ecology of the Cape clawless otter, Aonyx capensis, in an urban environment
… to study the impacts of urbanisation on otters as it presents a gradient from densely populated urban areas in the north (City of Cape Town) to sparsely populated areas interspersed with large expanses of natural habitat (Table Mountain National Park) in the south. In this thesis, I …
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Habitat suitability modeling for Lontra canadensis in east Tennessee
… of the present study is the relationship between otters and land cover. Using citizen-science, an analysis was conducted using ArcGIS and Maxent to determine potential habitat for river otters using presence-only data. The results of this study detail a habitat suitability map for river otters in …
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THE STATUS OF OTTERS (CARNIVORA : MUSTELIDAE : LUTRINAE) IN SINGAPORE AND MALAYSIA, AND THE DIET OF THE SMOOTH OTTER (LUTROGALE PERSPICILLATA) IN PENANG, WEST MALAYSIA
The IUCN/SSC Action Plan for Otters (Foster-Turley et al., 1990) alerted the scientific community to the fact that the biology of otters is relatively unknown, particularly in Asia. In response to this plan, the conservation biology of otters in Singapore and Malaysia is herein addressed. Three …
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NORTHERN RIVER OTTER POPULATION ASSESSMENT AND CONNECTIVITY IN WESTERN MONTANA
Northern river otters (Lontra canadensis) are elusive and difficult to monitor, and little is known about their movement patterns or how populations are structured on the landscape. Otters are sensitive to degradation of aquatic systems, mostly due to loss of prey. This is evident in the Upper …
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NORTHERN RIVER OTTER POPULATION ASSESSMENT AND CONNECTIVITY IN WESTERN MONTANA
Northern river otters (Lontra canadensis) are elusive and difficult to monitor, and little is known about their movement patterns or how populations are structured on the landscape. Otters are sensitive to degradation of aquatic systems, mostly due to loss of prey. This is evident in the Upper …
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Evaluation of anthropogenic disturbance on African clawless otter (Aonyx capensis) physiological stress, behaviour, and population density using non-invasive methods
… succeed in these environments. African clawless otters (Aonyx capensis) are the most widely distributed otter species in Africa and occur in a wide variety of habitats, including transformed landscapes. Thus, they are a good model species to investigate animal adaptions to anthropogenic …
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Structure, function and context : the impact of morphometry and ecology on olfactory sensitivity
… were obtained for the first time from two sea otters for seven odorant compounds from various natural sources. Otters were trained using operant conditioning to participate in direct behavioral testing. Sea otter olfactory sensitivity was comparable to that of previously studied terrestrial …
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T-RFLP analysis of bacterial 16S rRNA gene sequences isolated from river otter (Lontra canadensis) scat and parasite screening for the presence of Toxoplasma gondii
… species.</p> <p>Two road killed river otters were necropsied to recover brain and blood tissue. DNA was isolated using the Qiagen Tissue DNeasy Kit. Samples from both otters were amplified with a singe tube nested PCR primer set for the detection of the ITS 1 region of Toxoplasma …
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Structure, function and context : the impact of morphometry and ecology on olfactory sensitivity
… were obtained for the first time from two sea otters for seven odorant compounds from various natural sources. Otters were trained using operant conditioning to participate in direct behavioral testing. Sea otter olfactory sensitivity was comparable to that of previously studied terrestrial …
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Swimming sentinels : climate clues from stranded marine mammals
… attention to whales and dolphins, seals and sea otters, we may be able to learn something about our planet, and how its changes will impact its most abundant mammal: us.
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Vision Impairment and Depression in the Older Adult
The older adult population in the United States is rapidly expanding both because of longer life expectancies as well as the aging of the baby boomers. While vision impairment is a growing concern among older adults, there have been few, mostly small studies, of the impact of vision impairment on …
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Evaluating Recruitment Seasonality of Red Abalone (<i>Haliotis Rufescens</i>) to Inform Fisheries Management and Conservation Policy
… larvae and promote recruitment, predation by sea otters aggregates abalone in crevices and promotes fertilization success, and the perennially present <em>Macrocystis pyrifera</em> kelp forests better support abalone growth and fecundity than northern California forests dominated by annual …
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Pismo Clams (Tivela stultorum) in Califorina: Population Status, Habitat Associations, Reproduction, and Growth
… to human harvest and predation by California sea otters (<em>Enhydra lutris</em>); However, no studies have examined their populations, population drivers, or life history for at least 40 years. Managers require updated and expanded information on populations, habitat associations, reproduction …
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Ecology and conservation of Formosan clouded leopard, its prey, and other sympatric carnivores in southern Taiwan
… of the Formosan clouded leopards and Eurasian otters (Lutra lutra chinensis) and the declining Asiatic black bears and to consider reintroduction of Formosan clouded leopards, as well as active management of the other larger mammals. These results provided baseline information for …