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 81 for “"seabird"”.
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Seabird foraging in dynamic oceanographic features
… of how they create foraging habitat for seabirds and other marine predators. In the first part of this dissertation, I review current knowledge of how seabirds use oceanographic features with an emphasis on developing a more mechanistic understanding of these features, and identify …
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Seabird digestive physiology in relation to foraging ecology
This study addresses the question: are seabirds digestive opportunists or specialists? The extent of specialization in seabird digestive processes to different diets and foraging methods, is investigated experimentally. Gut passage rates of different food types of tested in vitro digestibility may …
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Drivers of productivity in a subarctic seabird: Arctic Terns in Iceland
… to anthropogenic and environmental stresses, and seabird populations that depend on marine resources are in decline in many areas of the world. Iceland supports internationally important populations of many seabird species and, although fishing pressures in Icelandic waters are relatively low, the …
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Survival and reproduction in a biennially-breeding seabird : the Wandering Albatross
… reproductive success of this long-lived pelagic seabird. Until recently, the complex adult life cycle has caused biases in conventional mark-recapture modelling analyses that assume that recapture probability is equal for 'observable' and 'unobservable' states of the biennial adult life cycle. …
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ECOLOGICAL AND PHYSIOLOGICAL MECHANISMS OF BIOLOGICAL RHYTHMS IN A POLAR-BREEDING SEABIRD
… during polar day by using an Arctic breeding seabird, thick-billed murre (Uria lomvia), that has sex-specific timing of activity above and below the polar circle during summer. Thick-billed murres’ sex-specific behavior when breeding was rhythmic during polar day with a period length of 24 h, …
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Understanding and mitigating seabird bycatch in the South African pelagic longline fishery
Seabirds are considered one of the most threatened groups of birds in the world. They face additional mortality both on their breeding islands from introduced predators and at sea by fishing fleets, as fisheries bycatch, as well as other human impacts. Seabird bycatch has negatively affected many …
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Seabird use of tidal stream environments and potential interactions with tidal energy devices
… habitats for marine wildlife, including seabirds. Risk of collision and habitat displacement are the major negative effects of concern. The following thesis therefore examined the use of tidal stream environments by diving seabirds and their potential interactions with tidal stream energy …
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The structure of pelagic seabird assemblages in the African sector of the Southern Ocean
… investigated the potential usefulness of aerial seabirds as indicators of the distribution of peculiar oceanic biotopes and prey populations in the African sector of the Southern ocean. The hypothesis examined was that the distribution and abundance of seabirds are non-random and predictable with …
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Parental care in the common tern (Sterna Nirundo): sexual roles in a monogamous seabird
The parental behaviour of male and female Common Terns (Sterna hirundo) was documented throughout two breeding seasons at a colony near Port Colborne , Ontario. Thirteen and fourteen pairs of terns were chosen for intensive study in 1982 and 1983, respectively. The delivery of fish by males to …
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An Assessment of Sea Turtle, Marine Mammal and Seabird Bycatch in the Wider Caribbean Region
… used to assess sea turtle, marine mammal and seabird bycatch in the WCR, with a particular focus on sea turtle bycatch. The research incorporated a synthetic review of the literature, expert consultation, statistical techniques, and geospatial analyses to assess the bycatch seascape for the …
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Assessing the distribution and vulnerability of a seabird community at sea to inform conservation and management
Seabirds are an apex predator in marine ecosystems and can be important bio-indicators for informing wider marine conservation and management. They face many threats from anthropogenic activities at sea but the interactions and subsequent impacts can often be difficult to monitor, particularly in …
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Spatial dynamics modeling for data-poor species using examples of longline seabird bycatch and endangered white abalone
… two kinds of data-poor species. One example was seabird bycatch from the U.S. Atlantic pelagic longline fishery, which focused on rare events/species for which data are generally characterized by a high percentage of zero observations. The other example was endangered white abalone off the …
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Investigating the foraging ecology and energy requirements of a seabird population increasing in an intensely exploited marine environment
Their high energetic demands make seabirds sensitive to changes in prey availability, which is often reflected in their diet and energetic expenditure during breeding. Populations of the three seabirds endemic to southern Africa's Benguela upwelling ecosystem that rely on small pelagic fish have …
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Assessing sea turtle, seabird and shark bycatch in artisanal, semi-industrial and industrial of fisheries in the Cabo Verde Archipelago
Firstly, I am very grateful to Birdlife International for the MSc scholarship. I am also very grateful to Professor Peter Ryan of the FitzPatrick Institute of African Ornithology, University of Cape Town, for agreeing to supervise this project and for his guidance, insights and comments on the …
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Analysis of seabird observation and satellite tracking data in the Falkland Islands to assess suitability for proposing Marine Important Bird Areas
… considerable resources, however the use of seabirds as biosystem indicators provides an option to reduce the expenditure and effort required as they are relatively easy to study, and act as bio-monitors of ecosystem change. The Falkland Islands seabird population has been extensively …
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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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The foraging ecology and conservation of the Great Black-backed Gull Larus marinus
… activities has multilayered consequences for seabird populations. Seabirds may suffer direct impacts such as reduced resource availability due to competition with fisheries, but deterioration in marine resources may also trigger indirect impacts such as the destabilisation of trophic …
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Rory lines : silver lining for seabirds in South Africa's demersal trawl fisheries
Seabird bycatch in commercial fisheries is one of the major factors causing decreases in many seabird populations. In trawl fisheries, high 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 …
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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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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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