Found 14065 items
1 January, 1984
This paper reports the post-mortem findings in 135 wild Antarctic fur seal pups which died of natural causes. The predominant lesions were those associated with starvation, trauma to the head…Read more on Pathology of the antarctic fur seal (Arctocephalus gazella) in South Georgia
1 January, 1984 by Ed King
Preliminary interpretation of marine geophysical data and geochemical analyses of dredged rocks has led to the identification of a ridge crest-trench collision zone southeast of the South Orkney Islands. The…Read more on An early miocene ridge crest-trench collision on the South Scotia Ridge near 36°W
1 January, 1984 by William Block
Although several invertebrates have been introduced by Man into the Antarctic, no holometabolous insects have survived to colonize terrestrial habitats successfully. Data are presented on the survival of populations of…Read more on An insect introduction to the maritime Antarctic
1 January, 1984
The Galapagos archipelago has been colonized by two species of otariid, the fur seal, Arctocephalus galapagoensis, and the sea lion, Zalophus californianus wollebaeki. The former probably arrived from South America…1 January, 1984
The subtidal bivalve Glycymeris glycymeris (L.) exhibits a high degree of respiratory independence in conditions of declining environmental oxygen tension. In contrast to other bivalves previously studied, the index of…1 January, 1984
The population dynamics of nearshore juvenile Notothenia rossii were studied at South Georgia during 1978 and 1979. Mortality of the population was calculated from length-class abundance of fish sampled by…Read more on The population dynamics of Notothenia rossii from South Georgia (Antarctica)
1 January, 1984
1. Consumption, production and assimilation rates were determined for two age groups of Crypropygus antarcticus to give an estimate of energy utilization, and to investigate low temperature adaptation in its…Read more on Energy partitioning in the Antarctic collembolan Cryptopygus antarcticus
1 January, 1984
1. Populations of two coexisting Antarctic Collembola were studied in the field and under constant conditions in the laboratory to determine their life cycles and to compare their energy utilisation.…Read more on Life cycle strategies in two Antarctic Collembola
1 January, 1984 by Andrew Clarke
Available data on the lipid content and composition of the Antarctic krill Euphausia superba Dana are summarized. Female total lipid content increases during the summer as the ovary matures, and…Read more on Lipid content and composition of Antarctic krill, Euphausia superba Dana
1 January, 1984 by Andrew Clarke
The lipip content and composition of various tissues from three species of nototheniid fish from McMurdo Sound, Antarctic have been examined in relation to their habitat and buoyancy. The pelagic…1 January, 1984
A high frequency radio Doppler experiment was deployed in the Antarctic Peninsula region, centred on Argentine Islands (65°15′S, 64°16′W; L = 2.3), to investigate the morphology and sources of ionospheric…Read more on Large simultaneous disturbances (LSDs) in the Antarctic ionosphere
1 January, 1984
A 40 km line across George VI Ice Shelf was sounded in January 1981 by both radio echo and seismic reflection methods. Because the velocities of radio and seismic waves…Read more on Ice-shelf densities from a comparison of radio echo and seismic soundings
1 January, 1984
The extent and causes of pup mortality in the Antarctic fur seal, Arctocephalus gazella, were investigated at sites of high and low density at South Georgia. Mortality was greater at…1 January, 1984
Large numbers of pups of the Antarctic fur seal were weighed at regular intervals through their rearing period in six seasons between 1972 and 1981 at South Georgia. Growth rates…Read more on Growth rates of Antarctic fur seal Arctocephalus gazella pups at South Georgia
1 January, 1984
Methane was found to occur in all freshwater lakes, irrespective of trophic status, sampled during this preliminary investigation at Signy Island, South Orkney Islands, Antarctica. Methane accumulated in the water…1 January, 1984
The relationship between capillary density and mitochondrial volume density has been investigated for the slow trunk muscle of the haemoglobinless ‘Icefish’, Chaenocephalus aceratus Lönnberg. In general, for teleost slow muscles…Read more on Skeletal muscle capillary supply in a fish that lacks respiratory pigments
1 January, 1984
We present some results from a model of forced oscillations of the magnetosphere. The purpose of this work is to examine the effects and consequences of damping on geomagnetic pulsations…1 January, 1984
Analytical results for five different geomagnetic pulsation events which occurred between 0 and 10 UT on November 28, 1977 are presented. The periods and latitudinal characteristics of the pulsations recorded…1 January, 1984
Endoparasitic and predatory nematophagous fungi are widely distributed throughout the maritime Antarctic, being recorded along the Antarctic Peninsula as far south as 68° S. Fungi were recorded from 71% of…Read more on The distribution of nematophagous fungi in the maritime Antarctic
1 January, 1984
The variations of the diurnal range of the geomagnetic field with sunspot number and with magnetic activity was studied at mid and high latitude stations in the northern hemisphere at…1 January, 1984
The distribution of phytoplankton along transects amounting to about 10,000 nautical miles in the sector of the Southern Ocean between 20° and 70°W was determined during the austral summer of…1 January, 1984
Three grasses (Phleum alpinum L., Deschampsia antarctica Desv., Festuca contracta T. Kirk) and one perennial herb (Acaena tenera Alboff) are the earliest important colonizers of small-scale sorted stone stripes in…Read more on Plant colonization of actively sorted stone stripes in the subantarctic
1 January, 1984 by Richard Horne
During geomagnetic storms different partial pressure gradients in the auroral ionosphere may result in H+, He+, O+ and molecular ions drifting with different velocities along the Earth's magnetic field line.…Read more on The effects of differential ion flows on EISCAT observations in the auroral ionosphere
1 January, 1984
The breeding biology and population dynamics of the two species of giant petrels, Macronectes halli and M. giganteus, were studied at Bird Island, South Georgia during 1978–81. The mean laying…1 January, 1984
Moult scores were collected from colour‐ringed individuals of known reproductive status of the two species of giant petrel, Macronectes halli and M. giganteus, at Bird Island, South Georgia between 1978–81.…Read more on Moult of the giant petrels Macronectes halli and M. giganteus at South Georgia
1 January, 1984
More than two hundred recoveries of giant petrels Macronectes halli and M. giganteus originally ringed at Bird Island, South Georgia, were analysed to determine the nature of any interspecific differences…Read more on Movements of giant petrels Macronectes spp. ringed at South Georgia
1 January, 1984
During a survey of microfungi on the subantarctic island of South Georgia, large numbers of phylloplane yeasts were isolated in late spring from leaves of a tussock grass. The dominant…1 November, 1983
Diving depths of four breeding chinstrap penguins were recorded throughout complete foraging trips to sea lasting 18-48 h at Signy Island, South Orkney Islands. Deeper dives reached 70 m but…Read more on Diving depths of the Chinstrap Penguin Pygoscelis antarctica
1 January, 1983
Geomagnetic variation fields recorded at a particular location can be analysed to provide information on the distribution of induced currents within the Earth. An analysis of the variation fields on…Read more on The influence of tectonic boundaries on geomagnetic variations in the Scotia Sea
1 January, 1983 by William Block
Adaptations to the Sub-Antarctic climate of South Georgia were studied in four species of Coleoptera. in larvae and adults of Hydromedion sparsutum and Perimylops antarcticus (Perimylopidae) collected during summer, the…Read more on Low temperature adaptations in beetles from the Sub-Antarctic Island of South Georgia