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Showing 1 to 20 of 52 for “"sub-Antarctic"”.
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Hydrochemical dynamics on sub-Antarctic Marion Island
Although sub-Antarctic maritime environments are some of the most sensitive regions to climate change, investigations into isotopic and hydrochemical dynamics on sub-Antarctic islands are limited. To address this, the Soft Plume River on sub-Antarctic Marion Island was sampled daily along an …
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Biology of Fungi on Plants in the Sub-Antarctic
… the island of South Georgia was made during the Antarctic summer of 1979 - 1980. Commonly isolated species included Botrytis cinerea, Chaetophoma sp., Chrysosportum pannorum, Cladosporium sphaerospermum, Penicillium spp. and Mucor hiemalis, plus a large number of sterile mycelia. As leaves aged, …
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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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Investigating ecological drivers and impacts of vegetation change in sub Antarctic tundra
… in response to the key drivers of change in the sub-Antarctic, focusing on Marion Island (MI). Given the recent origin and relative species poverty of the sub-Antarctic flora, changes in vegetation are expected to result from individual responses rather than collective trends across the entire …
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The intertidal and shallow subtidal food web of sub-antarctic Marion Island
The sub-Antarctic Prince Edward Island group, consisting of Marion Island and Prince Edward Island (Fig. 1), was annexed by South Africa in 1947-1948 and subsequently declared a nature reserve. Isolated oceanic islands have always presented interesting opportunities for biological research on both …
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Plankton dynamics of the open Southern Ocean and surrounding the (Sub)Antarctic islands
… poorly understood, particularly around the many (Sub)Antarctic islands where physical and biogeochemical variability is high. The major motivation for the work presented in this thesis is an improved understanding of the role of the plankton system in Southern Ocean fertility and carbon export, …
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Intrusions of sub-Antarctic surface water across the subtropical convergence southwest of Africa
… is preceded by the northward wedging of the Subtropical Convergence (STC) through the retroflection loop to effectively "pinch" off these rings. The resultant entrainment of cold Sub-Antarctic Water Surface (SAASW) behind the displaced STC is of climatic and oceanographic interest in light of …
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Investigating the sensitivity of one-dimensional turbulence schemes in the sub-Antarctic Southern Ocean
The sub-Antarctic Zone (SAZ) is a zone of vigorous vertical mixing in the Southern Ocean where it is difficult to obtain data for model validation on the turbulence conditions. In this study, a onedimensional configuration from the Nucleus for the European Modelling of the Ocean (NEMO) model was …
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Habitat association and distribution of Nauticaris marionis at the Sub-Antarctic Prince Edward Islands
… marionis and sessile epibenthic assemblages and substratum types of the Sub-Antarctic Prince Edward Islands were investigated. Twenty five stations, varying in substratum type, depth and location on the shelf and slope around the islands were sampled photographically with a towed benthic camera …
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The influence the oceanographic variability has on the top predators of the sub-Antarctic domain
… were obtained from devices fitted to 39 adult Subantarctic fur seal (SAFS) (Arctocephalus tropicalis) females inhabiting the Prince Edward Islands (PEI). This provided a unique opportunity to study the fine-scale effects of thermal water column structure and upper ocean submesoscale processes …
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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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Feeding biology and energetics of King Aptenodytes patagonicus and Gentoo Pygoscelis papua Penguins at sub-Antarctic Marion Island
… feeding Gentoo Penguin Pygoscelis papua at sub-Antarctic Marion Island.
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Quantifying spatial and temporal scales of phytoplankton variability in the Sub-Antarctic Ocean using a high-resolution glider dataset
Phytoplankton in the Sub-Antarctic Southern Ocean have a distinct seasonal cycle, which is highly variable in both space and time. The seasonal and spatial distribution of chlorophyll can be attributed to the complex nature of the physical and biogeochemical factors controlling phytoplankton …
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Sub-Antarctic plant-soil interactions in a changing world: plant N acquisition and growth under warming on Marion Island
… leaving southern cold ecosystems such as the subAntarctic underrepresented. Sub-Antarctic soils are typically replete in oN but not iN, however, plant oN uptake has not been accounted for in terrestrial N-budgets. Furthermore, the islands are experiencing high rates of climate change including …
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Characterising the response of the mixed and the transitional layers to the passage of storms in the Sub-Antarctic Zone
… Southern Ocean (SO) and have been shown to drive substantial vertical mixing, leaving behind wakes of perturbed upper ocean. The vertical extent and duration of the impact of these storms on the upper ocean remains unknown in this region, partly due to lack of observations in this remote part of …
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Palaeoceanographic conditions and palaeoproductivity changes from the sub-Antarctic island South Georgia since the late deglacial, using marine micropalaeontology and geochemistry
… South Georgia lies within the path of the Antarctic Circumpolar Current (ACC) and the Southern Hemisphere Westerly Winds (SWW), south of the current position of the Antarctic Polar Front and encircled by the Southern ACC Front (SACCF). South Georgia is one of the few locations in the …
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Influence of ecosystem variability on the demography and reproductive performance of two Eudyptes penguins, Macaroni and Eastern Rockhopper Penguins, at sub-Antarctic Marion Island, 1994–2019
… on more fish Protomyctophum tenisoni when the Sub-Antarctic Front (SAF) and Antarctic Polar Front (APF) were further away from Marion Island and fed on more crustaceans Thysanoessa vicina when the fronts were closer to the island. The variable latitudinal position of the fronts is known to …
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Insights into Glacial Terminations from a South Atlantic Perspective
… During these terminations atmospheric CO\textsubscript{2 }rose by approximately 100 ppm and global mean temperatures increased by 4-6\textsuperscript{o}C. Whilst the driver for these deglaciations ultimately derives from changes in the insolation forcing at the edge of the atmosphere, …
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Patterns of energy flow in populations of the dominant insect consumers on Marion Island
… or decomposers in the terrestrial ecosystem of sub-Antarctic Marion Island. Patterns of energy flow in individuals ("life strategies") and populations (population energetics) of the five species were studied against the evolutionary templet of their respective microhabitats. Energy flow through …
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