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 87 for “"Seabirds"”.
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Energy storage dynamics in breeding Arctic seabirds
… of lipid stores) dynamics in breeding Arctic seabirds. The first chapter compares three species feeding at similar trophic levels but with different life history, physiological and foraging strategies, and breeding strategies. They managed their stores differently during poor environmental …
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Seabirds as monitors of marine plastic pollution
… plastics at sea, they face several challenges. Seabirds, particularly petrels and albatrosses (order Procellariiformes), offer a practical alternative to net sampling as they often ingest and retain buoyant plastics encountered while foraging at sea, making them valuable indicators of this type …
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Dispersion of seabirds at sea in the Southern Ocean
… of obtaining information on the dispersion of seabirds at sea precise enough to reflect changes in their prey was investigated. A standardized technique for counting birds from a moving ship, designed to limit biases due to birds circling, following and/or deviating towards/from the ship, is …
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The incidence and effects of ingested plastic in seabirds
… the incidence of plastic particles at sea and in seabirds {Chapters 1-3), and an investigation of the postulated effects of plastic ingestion on seabirds (Chapters 4-7). The incidence of plastic at sea was recorded from neuston trawls performed monthly at 120 sampling stations off the southwestern …
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A conservation genetic study of threatened, endemic southern African seabirds
… fisheries and threatened marine top-predators. Seabirds are valuable indicators of the state of marine ecosystems, and changes in their distribution and dispersal patterns may reflect those of species in lower trophic-levels. This is the case in the ABE, where some endemic seabird species are …
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Investigating the potential effects of marine renewable energy developments on seabirds
… important<br/>breeding populations of seabirds and Scottish territorial waters represent a key<br/>overwintering area for many species. Several MRED sites in Scotland are located in proximity to Special Protection Areas (SPAs) and draft marine SPAs designated specifically to safeguard …
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How seabirds respond to a changing oceanic environment: a biologging approach
… storm frequency and intensity at a global scale. Seabirds are a group of marine predators that are sensitive to such changes, with impacts contributing to global population declines. We broadly understand how stressors affect different species through effects on life histories and physiological …
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Drivers of variation in the migration and foraging strategies of pelagic seabirds
The ability to move and forage efficiently plays a major role in determining the fate of individuals, and has important implications for population dynamics and ecosystem functioning. Migration is a particular type of movement strategy, whereby animals may travel remarkable distances in order to …
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The effects of introduced mice on seabirds breeding at sub-Antarctic Islands
Seabirds play keystone roles as apex predators in marine ecosystems and also influence the ecology of terrestrial ecosystems where they breed. Seabirds are among the most threatened group of birds - almost half of all seabird species are known or suspected to be experiencing population declines …
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Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries
… mortalities have been recorded as a result of seabirds being struck by trawl warps (the cables used to tow the trawl net). Tori (bird-scaring) lines have been used to decrease seabird mortality in some trawl fisheries by up to 90%. However, tori lines are not effective at reducing the number of …
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Impacts of the introduced house mouse on the seabirds of Gough Island
Introduced house mice Mus musculus on Gough Island were suspected of widespread predation of Atlantic Petrel Pterodroma incerta and Tristan Albatross Diomedia dabbenena chicks in 2000/01. Video cameras recorded six fatal attacks by mice on live, healthy Atlantic Petrel chicks in 2004. Crude …
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The impact of longline fishing on the seabirds breeding on Marion Island
… describes the impact of longline fishing on the seabirds breeding on the sub-Antarctic Prince Edward Islands. The development of a demersal longline fishery for Patagonian toothfish Dissostichus eleginoides close to the islands with almost complete observer coverage during the study allowed a …
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Developing and assessing methods to census and monitor burrow-nesting seabirds in Ireland
… This is particularly challenging for seabirds, where several life history characteristics and the remote nature of breeding colonies of many species make them difficult to study. Burrow-nesting species are the most difficult of all seabird groups to census due to their cryptic breeding …
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How animal movement defines behaviour: new insights into the ecology of seabirds at sea
… In this thesis, I use movement data from seabirds to explore the mechanisms behind foraging and how these are underpinned by the movement of individual animals. In chapter 1, I provide an introductory overview of the literature and introduce my study species. In chapter 2, I examine the …
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The effects of human disturbance on the seabirds and seals at sub-Antarctic Marion Island
Animals at Marion Island can be affected by logistic disturbance (especially helicopter noise), incidental pedestrian disturbance and research disturbance. The responses of wandering albatrosses (Diomedea exulans) and king penguins (Aptenodytes patagonicus) were investigated through standardised …
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Marine Resource Specialization in Viking Age Iceland: Exploitation of Seabirds and Fish on Hegranes in Skagafjörður
… The data also show specialized butchery of seabirds in the Alcidae family, which suggest cultural continuity of their use across the North Atlantic.</p> <p>This dissertation project aims to highlight the early animal use strategies in one region of Iceland, while also recognizing that other …
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