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Showing 1 to 20 of 35 for “"Marion Island"”.
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Hydrochemical dynamics on sub-Antarctic Marion Island
… 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 altitudinal gradient during an intense high-resolution 16-day field campaign in April/May 2015. Samples were analysed for stable …
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Ecological energetics of Eudyptes penguins at Marion Island
… Penguins (E. chrysocome) breed sympatrically at Marion Island in the sub-Antarctic, where they account for a substantial proportion of the avian biomass breeding at the island. This thesis documents the energy requirements of the two species during their respective breeding and moulting cycles at …
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Ecological segregation of burrowing petrels (Procellariidae) at Marion Island
… nesting within the area studied in north-eastern Marion Island during April 1979 to May 1980. These were Salvin's Prion Pachyptila vittata salvini, Blue Petrel Halobaena caerulea, Greatwinged Petrel Pterodroma macroptera, Kerguelen Petrel Pterodroma brevirostris, Softplumaged Petrel Pterodroma …
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Co-existence in the Phoebetria albatrosses at Marion Island
The aims of the present study are threefold. Firstly, the coexistence of the two closely related, normally allopatric, albatross species is investigated in their zone of overlap where interspecific competition for food resources and nesting space is likely to be most acute. Secondly, the genetic …
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Dispersal and dispersion of southern elephant seals at Marion Island
… of southern elephant seals, Mirounga leonina, at Marion Island in relation to their natal site, and to their site of first reproduction. Movements from the natal site to terrestrial haulouts used for reproduction, and between successive reproductive sites, were defined as dispersal, while …
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Behavioural ecology of lesser sheathbills Chionis minor at Marion Island
Adaptations to island life have seldom been studied in birds outside temperate or tropical regions. Lesser Sheathbills Chionis minor (Charadriiformes; Chionididae) were studied at Marion Island (46°54'S, 37°45'E) and the ways in which their feeding ecology, breeding biology and social behaviour …
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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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The impact of longline fishing on the seabirds breeding on Marion Island
… 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 detailed examination of the impacts of this fishery. The …
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Patterns of energy flow in populations of the dominant insect consumers on Marion Island
… 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 populations of …
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Genetic diversity and hybridisation estimates of Arctocephalus tropicalis and A. gazella from Marion Island
… and A. gazella), that occur on Sub-Antarctic Marion Island. Both species were harvested during the 18th and 19th centuries, leading to a reduction in population size and the extinction of A. gazella at some localities. Whilst both species have recovered and are increasing in size, it is not …
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The population status, breeding success and foraging ecology of Phoebetria albatrosses on Marion Island
… of predatory fish and squid. Sub-Antarctic islands are important breeding grounds for many seabirds, including albatrosses. Monitoring of seabirds breeding on sub-Antarctic islands is important to detect changes in population dynamics to be able to implement timely conservation measures. …
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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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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 …
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Feeding biology and energetics of King Aptenodytes patagonicus and Gentoo Pygoscelis papua Penguins at sub-Antarctic Marion Island
… Gentoo Penguin Pygoscelis papua at sub-Antarctic Marion Island.
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Sub-Antarctic plant-soil interactions in a changing world: plant N acquisition and growth under warming on Marion Island
… for in terrestrial N-budgets. Furthermore, the islands are experiencing high rates of climate change including increasing temperatures. This thesis examines sub-Antarctic plant-soil interactions, investigating whether sub-Antarctic grasses acquire oN and how soil warming affects plant growth and …
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The population status, breeding success and diet of Subantarctic Skuas two decades after the feral cat eradication on Marion Island
… responses. Invasive mammals introduced to island ecosystems can have detrimental impacts on endemic bird populations and thus disrupt predator-prey relationships. In cases where a predator is dependent on a certain prey species, the distribution, abundance, breeding success and diet of a …
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Linking foraging behaviour of post-breeding adult female elephant seals from Marion Island to physical dynamics and productivity at the South-West Indian Ridge
… adult female southern elephant seals from Marion Island were tagged with conductivity, temperature and depth satellite-relayed data loggers (CTD-SRDL's) and their foraging behaviour was examined in relation to different chlorophyII-a concentrations. Optimal foraging and area restricted …
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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
… of Macaroni and Eastern Rockhopper Penguins at Marion Island from 1994–2019. The breeding population of Macaroni Penguins has decreased more or less consistently at an average rate of 1.9% per year since 1994, whereas Eastern Rockhopper Penguins showed a rapid initial decline of 13% per year …
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Phytoplankton distribution and nitrogen dynamics in the southwest Indian subtropical gyre and Southern Ocean waters
Marion Island Oceanographic Survey IV, April-May 1999
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