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Showing 1 to 16 of 16 for “"Tristan da Cunha"”.
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Holocene climate and environmental dynamics on the Tristan da Cunha island group, South Atlantic
… sediment sequences were retrieved from the Tristan da Cunha island group in the central South Atlantic. These sequences were analysed with a multiproxy approach including pollen analysis, measurements of total carbon, nitrogen and sulphur, mineral magnetic measurements and detailed …
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Island bodies: registers of race and 'Englishness' on Tristan da Cunha c.1811 - c.1940
Tristan da Cunha, a small island in the South Atlantic, is perhaps best known today as the remotest inhabited island in the world. Historical scholarship relating to the island has either focused on its supposed insularity, or has completely elided it in the broader thematic and theoretical studies …
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On the subtropical front in the South Atlantic Ocean
The region surrounding the Tristan da Cunha Archipelago has received little attention to date due to its remote location. An extensive revision of previous literature covers the majority of oceanographic research undertaken in the region of interest. New satellite derived oceanographic data sets …
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Comparative breeding biology of the Northern Rockhopper penguin Eudyptes moseleyi on Gough and Nightingale Islands
… Penguin Eudyptes moseleyi is listed as Endangered due to an estimated 57% decrease in breeding numbers over the past 37 years. Approximately 85% of the global population breeds at the Tristan da Cunha archipelago (Tristan, Inaccessible and Nightingale Islands) and nearby Gough Island in …
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Labour, Environment and Empire in the South Atlantic (1780-1860)
… Atlantic Ocean and its islands (Saint Helena, Tristan da Cunha, Ascension) were a periphery of the British Empire. Nevertheless this region faced a dramatic transformation during the Global Age of Revolutions (1780-1830) and moved from being a transition zone between Europe and Asia into a …
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U-Th-Pb fractionation in selected carbonate and silicate systems
… old Jacupiranga complex in southern Brazil. The data preclude simple models in which the Sr-Nd and Sr-Pb isotope arrays are the result of crustal contamination processes, or liquid immiscibility between the carbonatites and magmas similar to those from which the pyroxenites crystallised. The …
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Geochemistry of dolerites from the Parana flood basalt province, southern Brazil
… erupted on the South Atlantic island of Tristan da Cunha, and are interpreted as the expression of the Tristan plume at 80 Ma. Selected whole rock samples and mineral separates have been dated by the laser ablation Ar-Ar technique. The Ponta Grossa dolerites yield isochron ages of …
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Comparative ecology of Pachyptila species breeding sympatrically at Gough Island
Prions (Pachyptila spp.) are one of the most abundant seabird groups of the Southern Ocean but their taxonomy, at-sea distribution and foraging ecology are poorly known. There has been considerable confusion surrounding the taxonomy of prions and their identification at sea is problematic. Recent …
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The hydrocarbon potential of the deep offshore along the Argentine volcanic rifted margin : a numerical simulation
… sequences (SDRS), possibly caused by the Tristan da Cunha hot spot. After break-up, thermal subsidence affected predominantly the development of the rifted volcanic continental margin, especially the elongated zone of the SDRS and a thick sedimentary column was deposited onto this …
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Biogeography of Isolepis subgenus Fluitantes (C.B. Clarke), Muasya (Cyperaceae): niche conservatism, long distance dispersal and hybridization
… of speciation processes in the clade. Sequence data of the ITS and atpi-H gene regions were collected for 82 specimens; these were used to construct haplotype networks and phylogenies. By using the Tristan da Cunha endemics in the genus, as well as results from higher-level studies, a dated …
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Diet of the Tristan rock lobster Jasus tristani following the 2011 soya spill at Nightingale Island
The spiny lobster Jasus tristani inhabits the Tristan da Cunha Island archipelago in the South Atlantic Ocean 2,400km from the West coast of South Africa. It is commercially exploited across the archipelago and is the main economic source of income for the local government as it accounts for nearly …
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Magmatism in southern Uruguay and the early rifting of the South Atlantic
… at the periphery of the influence of the Tristan da Cunha plume. <br></br><br></br>The volcanic rocks of southern Uruguay are bimodal in silica, and the majority of basalts of the Puerto G6mez Fm., herein termed the Treinte Y Tres magma type, have major-, trace- element and initial isotope …
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Helium isotope geochemistry of oceanic volcanic rocks : implications for mantle heterogeneity and degassing
… (for alkali islands such as Gough and Tristan da Cunha) to 31.9 x atmospheric (for Loihi Seamount). The regional variability, and the correlations with 87Sr/86Sr can best be explained by the presence of three distinct reservoirs in the mantle which mix with one another. The three mantle …
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A study of the distribution of algae in the Two Oceans Aquarium, Kelp Tank, Cape Town
… cover values as well as the environmental data were entered into CANOCO, an ordination programme for windows. Ordination showed that the tank was essentially a homogeneous environment with no difference in species distribution with regard to wall orientation, depth, substrate type, or …
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Remotely sensing motion: the use of multiple biologging technologies to detect fine-scale, at-sea behaviour of breeding seabirds in a variable Southern Ocean environment
… to flying seabirds where multiple sensors record data at infrasecond sampling rates. These data can be used to infer, inter alia, body posture, activity (e.g. flapping, takeoff, landing, etc.), magnetic heading and spatial distribution at a resolution that was not previously possible. Bio-logging …