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.
Results
Showing 1 to 20 of 30 for “"Fur seals"”.
-
Entanglement of Cape Fur Seals (Arctocephalus pusillus pusillus) in South Africa
… African continent, the pinniped species, Cape fur seal (Arctocephalus pusillus pusillus), are vulnerable to entanglement due to their curious nature and thick fur. Entanglement data were available from systematic photographic surveys of six colonies in South Africa (2019-2022) as well as …
-
Disentangling entanglement in Cape fur seals for better management of plastic pollution impacts
… and probable source of entanglements of Cape fur seals (Arctocephalus pusillus pusillus) in the Victoria and Alfred (V&A) Waterfront and broader Cape Town harbour area. Between 1986-2018, 5843 entanglements (annual mean and standard deviation: 177±166) were recorded through systematic surveys, …
-
Potential of faeces for non-invasive assessment of Juan Fernandez fur seals and their environment
The Juan Fernandez fur seal (JFFS) is a marine mammal endemic to the Juan Fernandez Archipelago in the Pacific Ocean. The archipelago is a UNESCO Biosphere Reserve and has been identified as one of the eleven irreplaceable priority sites for marine conservation worldwide. As a result of overhunting …
-
Linked Changes in Prey Availability and Population Structure: Using Antarctic Fur Seals to Sample Marine Systems
… trip durations of lactating female Antarctic fur seals, to the abundance and availability of Antarctic krill, where the mean length of krill consumed is used a proxy of krill availability. Over six years, 1568 foraging trips were measured for 178 individual seals, foraging from Bird Island, …
-
The relationship between two species of fur seals Arctocephalus Tropicalis (Gray) and A. Gazella (Peters) on Marion Island
Subantarctic fur seals Arctocephalus tropicalis and Antarctic fur seals A. gazella are sympatric at the Prince Edward Is lands, and appear to be hybridizing. Adult males of both species and the interspecific hybrids can be distinguished using univariate and multivariate analyses of cranial …
-
The effects of white shark presence on the behaviour of Cape fur seals at Geyser Rock, Gansbaai, South Africa
… where white shark presence is seasonal, and seals exhibit marked behavioural differences between seasons. What is lacking from these studies, however, is how subsurface habitat around the islands, specifically refugia, may influence the behaviour of seals and their interactions with white …
-
Variability in the diet of cape fur seals and their interaction with fisheries off the South African coast, 2010-2019
Cape fur seals (Arctocephalus pusillus pusillus) are sentinel marine top predators in southern African coastal waters due to their generalist diet and wide breeding range from southern Angola (Baia dos Tigres) to Algoa Bay, South Africa. Their long-life span makes them good indicators of ecosystem …
-
Influences of social and habitat features on selection and use of breeding habitat and pup survival in South American fur seals
<p>Quantitative information is lacking about how fur seals use habitat and how this use influences fitness. Such information is important for understanding the prospects for recovery of declining populations like those of South American fur seals (Arctocephalus australis) in Peru. In this study I …
-
Investigation of the impact of fur seals on the conversation status of seabirds at islands off South Africa and the the Prince Edward Islands
… investigated the impact of predation by the Cape fur seals Arctocephalus pusillus pusillus on the conservation status of seabirds at islands off the coast of South Africa and at the Prince Edward Islands. At Malgas Island, the impact of predation was investigated over three breeding seasons …
-
The effect and conservation implications of the re-establishment of a Cape fur seal Arctocephalus pusillus pusillus breeding colony at Vondeling Island, Saldanha Bay
With regards competition for breeding space, Cape fur seals outcompeted African penguins and Cape cormorants. At the beginning of the study period, African penguins and Cape cormorants had bred in the interior of the island. An interior wall that was built for guano retention had also kept seals …
-
Anti-predator behaviour of Cape fur seals Arctocephalus pusillus pusillus in relation to predation by white sharks Carcharodon carcharias around Seal Island, False Bay, South Africa
… by white sharks Carcharodon carcharias on Cape fur seals Arctocephalus pusillus pusillus suggested a landscape of fear particularly apposite to this.
-
Natural science and the American government: fur seal management from gilded age to progressive era
… examines the study and management of Alaskan fur seals from 1867 to 1914. Government involvement in resource conservation expanded during this period, as did the role of experts. Federal officials charged with managing fur seals often sought advice from scientists, and over the years …
-
Application of ANOVA for the analysis of temporal and spatial differences in the length of pelagic goby preyed on by Cape fur seals in the coasts of Namibia
… length preyed on by three different colonies of fur seals at the Namibian coast. Moreover, ANOVA was used to investigate temporal differences in lengths of goby preyed on by fur seals in each location of the seal colonies. Results of the analysis are shown in the Analysis and results section, and …
-
Spatiotemporal variability in Antarctic krill (Euphausia superba) around South Georgia from Antarctic fur seal (Arctocephalus gazella) diets at two long term monitoring sites
… of dependent higher predators, such as Antarctic fur seals - Arctocephalus gazella (Peters, 1875). This study compares two long-term datasets (2008-2021) of Antarctic fur seal diet from Bird Island and King Edward Point, South Georgia, to investigate year-round krill dynamics. Foraging tracks from …
-
Morphometric analysis of ears in two families of pinnipeds
… hearing mechanisms. The Otariidae (sea lions and fur seals) generally divide their time evenly between land and water and have several adaptations; e.g. external pinnae, related to this lifestyle. Phocidae (true seals) spend the majority of their time in water; they lack external pinnae and have …
-
Investigation of possible dietary differences between the inhabitants of the Robberg/Plettenberg Bay and Matjes River Rock Shelter in the later Stone Age : an isotopic approach
… shellfish and Arctocephalus pusillus (Cape Fur seals), representing the lower and higher trophic level marine foods important in prehistoric diets along the coast.
-
First detection of otarine herpesvirus-1 in South America: Characterizing the epidemiology in a Peruvian pinniped population
… American sea lions (Otaria byronia) and Peruvian fur seals (Arctocephalus australis unnamed subspecies) in Punta San Juan, Peru for OtHV-1 and to determine prevalence by demographic factors. Twenty-one percent (14/67) of urogenital swabs collected over three years (2011, 2014, 2015) from live …
-
An updated model of the krill-predator dynamics of the Antarctic ecosystem
… main krill-eating predators including whales, seals, fish and penguins, together with an historical record of the human harvesting in the region. The abundances and per capita krill consumption of the krill-predators are calculated and used to determine the main krill-predators to be used in …
Page 1 of 2