Showing 11332 items
1 January, 1986
On occasion the third hop of an echoing magnetospheric whistler exceeds the first hop in intensity over some low range of frequencies. Case studies show that this anomalous behavior can…Read more on The third hop whistler anomaly: possible evidence of df/dt-dependent wave amplification
1 January, 1986 by Andrew Clarke
The decapods Pasiphaea scotiae (Stebbing), P. rathbunae (Stebbing), Petalidium foliaceum Bate and Acanthephyra pelagica (Risso) and the mysid Gnathophausia gigas (W.-Suhm) have been sampled from the Southern Ocean. Lipid contents…Read more on Lipid content and composition of some midwater crustaceans from the Southern Ocean
1 January, 1986 by Andrew Clarke
86Rb uptake was examined in two species of unicellular green algae, Chlamydomonas nivalis isolated from snow, and a cell wall-less mutant of the temperate freshwater Chlamydomonas reinhardii. In C. reinhardii…1 January, 1986
Since 1981, the British Antarctic Survey has flown 27 000 line kilometres over Ronne Ice Shelf, during which radio-echo ice thicknesses were recorded. An earlier map of ice thickness was…1 January, 1986 by Alistair Crame
Bipolar bivalve genera probably existed through the greater part of late Mesozoic (i.e. late Jurassic–late Cretaceous) time. Of the various theories put forward to account for their presence, those based…1 January, 1986
Rates of disappearance of dead material of Polytrichum alpestre and Chorisodontium aciphyllum from a moss turf community and of Drepanocladus uncinatus, Calliergon sarmentosum and Cephaloziella varians from a moss carpet…Read more on Environmental factors influencing decomposition rates in two Antarctic moss communities
1 January, 1986
A simple user interactive technique that allows digital ionosonde sky map echo location data to be dealiased uniquely is described. Unambiguous tracking of large‐scale ionospheric features is thus made possible.…Read more on A simple graphical method for dealiasing digital ionosonde echo location data
1 January, 1986
The availability of representative empirical models of the variation of the electron concentration with height in the ionosphere is one critical element in the development of practical schemes for providing…1 January, 1986
Immediate-energy-supply pathways were analysed during burst-swimming in white muscle of the Antarctic fish Notothenia neglecta, (collected during Austral summer 1984 near Signy Island, South Orkneys). Selected enzyme activities were determined,…Read more on Metabolic constraints on burst-swimming in the Antarctic teleost Notothenia neglecta
1 January, 1986
The effectiveness of the Rectangular Midwater Trawl (RMT) for sampling krill swarms was studied by observing the behaviour of swarms in the vicinity of the net using echosounders. Large scale…Read more on Effectiveness of the RMT8 system for sampling krill (Euphausia superba) swarms
1 January, 1986 by Jane Francis
Although the Antarctic Peninsula now has a glacial climate, during the Cretaceous and early Tertiary it was sufficiently warm for forests to thrive, even at palaeolatitudes of 59°-62° S. The…1 January, 1986
The reproductive endocrinology of the Wandering Albatross Diomedea exulans was studied at South Georgia to investigate the potential endocrine correlates of biennial breeding and of the acquisition of sexual maturity.…1 January, 1986 by Jonathan Shanklin
Measurements of total ozone at Halley Bay, Antarctica, are presented for the six most recent observing seasons, 1980‐86, showing the consistency and progress of the spring ozone depletion. The principal…Read more on Recent measurements of Antarctic ozone depletion
1 January, 1986
We present results from the analysis of magnetometer measurements of one of the clearest observations of a double resonance Pc4 pulsation to date. The Pc4, with a period of 55…1 January, 1986
Rock moisture content is a major control of mechanical weathering, particularly freeze‐thaw, and yet almost no data exist from field situations. This study presents moisture content values for rocks, taken…1 January, 1986
The dark respiration of field‐fresh thalli of Umbilicaria antarctica Frey et Lamb is reported for temperatures from −5.5 to 19°C, and water contents from saturation to dryness. Detailed analysis of…1 January, 1986
VLF goniometers have been used to study the direction of plasma convection in the evening plasmasphere. The results suggest that sometimes even for L values greater than 4 the electric…Read more on Further evidence for the ionospheric contribution to convection within the plasmasphere
1 January, 1986
The reconfiguration of both the receiver dipole array and the pulse set used by the National Oceanic and Atmospheric Administration (NOAA) HF radar enables all ambiguity in polarization to be…1 January, 1986
One of the many discoveries by Voyagers 1 and 2 during their flyby of Jupiter was the detection of radio emission at kilometric wavelengths1,2 in the frequency range 20–500 kHz.…Read more on Io plasma torus and the source of jovian kilometric radiation (bKOM)
1 January, 1986
The carriage of Staphylococcus aureus was studied in a group of 28 men living in a totally isolated environment for a year. Initially, nasal, axillary and perineal swabs were taken…Read more on Staphylococcus aureus in Antarctica: carriage and attempted eradication
1 January, 1986
Extracellular proteins produced by Staphylococcus aureus strains were examined by Western Blot analysis with blood donor plasma as a source of antibodies. Comparison of epidemiologically related strains showed strong concordance…1 January, 1986
A dominance hierarchy developed within a wintering flock of Greater Sheathbills which fed regularly at a concentrated artificial food source. Each bir's dominance position was determined from the proportion of…1 January, 1986
Determination of geographically dependent sedimentological variation (‘proximality’) in ancient flysch deposits formed an important part of early turbidite studies. Attempts to quantify this variation highlighted anomalies which were neatly resolved…1 January, 1986
A model involving repeated NNW-directed ductile thrusting in subduction complex rocks on Signy Island. South Orkney Islands, accounts for the consistent NNW-trending alignment of fold axes, stretching and shearing directions.…Read more on Ductile thrusting within subduction complex rocks on Signy Island, South Orkney Islands
1 January, 1986 by Andrew Clarke, Lloyd Peck
The metabolism of the Antarctic brachiopod Liothyrella uva (Jackson, 1912) has been investigated in the laboratory under simulated winter conditions of low temperature and no food. Under such conditions the…1 January, 1986
Summary 1. The Southern Ocean is a large‐scale, relatively homogeneous upwelling ecosystem whose phytoplankton apparently grows suboptimally over much of its area. By contrast there is a wide variety of…Read more on Antarctic aquatic ecosystems as habitats for phytoplankton
1 January, 1986
Data on phytoplankton and zooplankton biomass, and physical and chemical variables, are combined with a published multivariate description of diatom species composition to interpret variation within an area around South…1 January, 1986
The c. 6 km2 complex comprises graphitic/pyritic, mainly kyanite-rich pelites, interbanded with metalimestones and invaded by foliated serpentinites. It is enveloped by typically Moinian psammites, semipelites and pelites. Previously regarded…1 January, 1986
Data from the Advanced Ionospheric Sounder (AIS) deployed at Halley, Antarctica (76°S, 27°W; L = 4.2) and the Dynamics Explorer-2 spacecraft (DE-2) are used to investigate several aspects of the…Read more on The poleward edge of the mid-latitude trough—its formation, orientation and dynamics
1 January, 1986
Magnetograms from Lerwick, Scotland and Halley, Antarctica are used to show that the effects of the DPY current system can frequently be detected at these sub-auroral observatories. It is found…Read more on Observations of the effects of DPY currents at sub-auroral latitudes
1 January, 1986 by Paul Rodhouse
During R.R.S. “Discovery” Cruise 100 in the Southern Ocean (1979), 620 specimens of the Antarctic cranchiid squid Galiteuthis glacialis (Chun) were caught in the RMT8 opening-closing net, to the south…1 January, 1986
The breeding performance of Blue-eyed shags of known age (up to 12 yr old) was studied on Signy Island, South Orkney Islands for three seasons. Mate change between seasons was…1 January, 1986
Satellite images recorded in 1973, 1974, and 1985 of the Brunt Ice Shelf are compared. There are sufficient identifiable features moving with the ice shelf to show flow patterns over…Read more on Flow of the Brunt Ice Shelf, Antarctica, derived from Landsat images, 1974–85
1 January, 1986
Landsat multispectral images of the Antarctic ice sheet have been digitally enhanced by the US Geological Survey to show ice surface features not seen in earlier photographic products of the…Read more on Multispectral digital image mapping of Antarctic ice features
1 January, 1986
Four conservation areas in the maritime Antarctic (three Specially Protected Areas and a Site of Special Scientific Interest) are compared with neighbouring islands which have not been awarded similar conservation…1 January, 1986 by Jonathan Watkins
Antarctic krill, Euphausia superba Dana, were sampled from 28 discrete swarms in a small area south west of Elphant Island, South Shetlands, over a period of 14 d (24 February-9…1 January, 1986 by Eric Wolff
Two situations are studied in relation to the flow law of polar ice. In each case, models are used with a flow-law exponent of one, and with the more traditional…1 January, 1986
Wave and particle correlator experiments on board the UKS revealed a wide range of plasma wave and wave-particle interactions associated with the 27 December 1984 artificial comet release just outside…1 January, 1986 by Roger Worland, William Block
Seven species of Antarctic micro-arthropods (4 mites and 3 collembolans) were examined to determine their resistance to dehydration and their survival under dry conditions. Water loss at r.h. 5% at…Read more on Survival and water loss in some Antarctic arthropods
1 November, 1985 by Andrew Clarke
Cephalopods may be divided into five types according to their buoyancy. Members of several families such as the Octopodidae, Loliginidae and Ommastrephidae are negatively buoyant and must swim to stay…1 September, 1985 by Andrew Clarke
Gammarus oceanicus Segerstråle, 1947 and Echinogammarus marinus (Leach, 1815) were sampled during the breeding season from Oslofjord in 1984, and their lipid composition examined in relation to reproductive condition. In…1 January, 1985
Single fast myotomal fibres and small bundles of slow fibres (from the adductor pectoralis profundus muscle) were isolated from the Antarctic teleost Notothenia neglecta. Fibres were skinned by a brief…1 January, 1985
Egg composition and factors influencing egg formation were studied in Black‐browed and Grey‐headed Albatrosses Diomedea melanophris and D. chrysostoma at Bird Island, South Georgia. At nests where eggs were laid,…1 January, 1985
A series of 40 male and 40 female mites of the prostigmatid genus Eupodes from the maritime Antarctic were each scored for 58 morphological characters, and principal co‐ordinate analyses were…