Found 14112 items
1 January, 1984
The signature of the stable auroral red arc (SAR arc) as it appears on ionograms is described. The key features are a very significant increase in the amount of spread-F…1 January, 1984 by Michael Pinnock
We describe a simple method for determining the time at which the meridian of a sub-auroral magnetic observatory crosses that of the Harang discontinuity—the separation of the eastward and westward…1 January, 1984
Position fixes made at the British Antarctic Survey station, Halley, on the Brunt Ice Shelf are considered for the period 1968–82. These show an initial westward velocity of approximately 400…Read more on Accelerating flow of the Brunt Ice Shelf, Antarctica
1 January, 1984
Southernmost of the Falkland Islands, Beauchêne Island (52° 54' S, 59° 09' W, area 3 km2) is a wildlife reserve with large colonies of Black-browed albatrosses and Rockhopper penguins. Discovered…1 January, 1984
Most of Beauchêne Island in the South Atlantic is covered by tussac, the tussock-forming grass Poa flabellata (Lam.) Rasp., which has produced a deep accumulation of exceptionally dense peat during…Read more on An extraordinary peat-forming community on the Falkland Islands
1 January, 1984
Two methods were used to locate the grounding line on the Rutford Ice Stream. The first method determined where the glacier was floating in hydrostatic equilibrium, while the second method…1 January, 1984
South Georgia contains a diverse suite of rocks representing different stages in the development of a back-arc basin on the Gondwana margin during the Mesozoic. Basin formation initially involved intrusion…1 January, 1984 by William Block
The resistance of Halozetes marinus (Cryptostigmata) and Hyadesia maxima (Astigmata) to cold and heat, to submergence in water and to anoxia was studied to determine their adaptations to the intertidal…Read more on Ecophysiology of two intertidal mites at South Georgia
1 January, 1984
Aboard the Porcupine rockets, bursts of noise were detected in the electron whistler range during the operation of a xenon plasma gun on a package ejected from the main payload.…Read more on Excitation of the lower oblique resonance by an artificial plasma jet in the ionosphere
1 January, 1984
Laboratory investigations of predation by Gamasellus racovitzai (Acarina: Mesostigmata) on Cryptopygus antarcticus (Insecta: Collembola) are described. The predator appeared to search at random, but, when contact with prey had been…1 January, 1984
Belgica antarctica Jacobs is recorded for the first time from two localities south of the Antarctic circle: Orford Cliff (66°55'S) on the Continental mainland and the Refuge Islands (68°21'S). The…1 January, 1984
The introduced reindeer of South Georgia have had a serious impact on the vegetation throughout the range of three populations on the island. Exclosure experiments in areas where the reindeer…1 January, 1984 by Peter Ward
Population structure and aspects of the reproductive biology of Antarctomysis maxima from South Georgia and the South Orkney Islands were examined. Size frequency analysis indicated that the generation time is…Read more on Aspects of the biology of Antarctomysis maxima (Crustacea: Mysidacea)
1 January, 1984 by Eric Wolff
It has been suggested that the dc conductivity of polar ice sheets could be due to the presence of liquid layers at the grain boundaries. These layers would consist of…Read more on A two-phase model of electrical conduction in polar ice sheets
1 January, 1984
The hypothesis that moss peat respiration in the maritime Antarctic was dependent more on edaphic conditions, substrate quality and microflora than latitude was broadly supported by studies on a 14°…1 January, 1984
Leptoglossum omnivorum sp.nov. is proposed and compared with other species of the genus Leptoglossum Karst., together with species formerly included in Mniopetalum Donk & Singer.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…