Showing 13487 items
1 September, 1994
Mid-Cretaceous igneous rocks of central Marie Byrd Land, Antarctica record a rapid change from subduction-related to rift-related magmatism. This correlates with the final stages of subduction of the Phoenix plate…1 September, 1994 by Richard Horne
The path-integrated linear growth of electromagnetic ion cyclotron waves in the outer (L ≥ 7) magnetosphere is investigated using a realistic thermal plasma distribution with an additional anisotropic energetic ring…1 August, 1994
The effects of cytochalasin B and dimethyl sulphoxide (DMSO) on ciliate ingestion and growth were investigated in laboratory cultures of the freshwater ciliate Tetrahymena pyriformis and the marine ciliate Uronema…1 August, 1994
The major flavonoid constituents of the Antarctic grass, Deschampsia antarctica, are shown to be the C-glycosylflavones, isoswertiajaponin (7-O-methylorientin) 2′'-O-β-arabinopyranoside and orientin. These are accompanied by lower levels of orientin 2′'-O-arabinopyranoside,…1 July, 1994 by Adrian Fox
The completion of the SCAR Antarctic digital database (ADD) has provided a new basis for statistical calculations for Antarctica: data-sets are available at the scale of the original source material,…1 July, 1994 by Eugene Murphy, Paul Rodhouse
Artificial selection processes associated with harvesting may operate over relatively short time scales in short-lived semelparous species. The ommastrephid squid Illex argentinus on the Patagonian Shelf is the target of…1 July, 1994
Upper Cretaceous shallow-marine sediments from Vega Island, Antarctica, contain five major authigenic phases; glauconite, pyrite, a zeolite mineral of the clinoptilolite-heulandite group, chlorite, and calcite. The framework sediment composition changes…1 July, 1994 by Peter Kirsch
Spectral measurements of the solar UV irradiance at the earth's surface depend critically on the characteristics of the spectroradiometers and the procedures used in their calibration. Two UV spectroradiometers were…Read more on A laboratory investigation of two ultraviolet spectroradiometers
1 July, 1994
Twenty one species of seabirds plus fur seals were observed at sea near the Antarctic Peninsula, between 60 °–68 °S, in May and June 1986, a season for which few…1 July, 1994
Quartz veins and vein-breccias in a greywacke-shale sequence of ?Carboniferous-Triassic age were previously regarded as mesothermal silicified fault breccias, and related to an adjacent Eocene granodiorite pluton. New mapping of…1 June, 1994 by Paul Rodhouse
Morphometric data were collected for 410 specimens of Pareledone turqueti and P. polymorpha caught around South Georgia. The two species differ in beak morphology and in the male hectocotylus. The…Read more on Comparative morphology of two sympatric Pareledone species from South Georgia
1 June, 1994
The LeMay Group of Alexander Island, Antarctica, is a Mesozoic accretionary prism that contains slivers of ocean floor and ocean island material, accreted under a range of conditions and depths.…1 June, 1994 by Howard Roscoe
Total ozone was measured from Abisko, Sweden (68.4°N, 18.8°E) from January to early March 1992, by a new instrument which uses stars and the Moon as sources of UV-visible light…Read more on Total ozone measured during EASOE by a UV-visible spectrometer which observes stars
1 June, 1994 by Paul Rodhouse
Theory predicts that, in a closed exploited population showing no sampling or other bias, the mean age of fish or squid between one sampling date and the next should increase…Read more on Migration as a source of bias in the measurement of cephalopod growth
1 June, 1994
Samples of liver from 11 female Antarctic fur seals (Arctocephalus gazella) from Bird Island, South Georgia were analysed for 16 trace elements (Mg, Cr, Co, Cu, Zn, Rb, Sr, Mo,…1 June, 1994 by John King
The accumulation of drifting snow around buildings in regions of severe climate has important implications on their design and location. This paper studies one such building, at a station run…Read more on A numlerical model of blowing snow around an Antarctic building
1 June, 1994 by Eric Wolff, Robert Mulvaney
A compilation of reliable data for sodium, nitrate, chloride and sulphate has been made. NO3 concentrations arc remarkably consistent across Antarctica, though there appears to be some correlation with altitude…Read more on Spatial variability of the major chemistry of the Antarctic ice sheet
1 June, 1994
The growth kinetics of two psychrotolerant Antarctic bacteria, Hydrogenophaga pseudoflava CR3/2/10 (2/10) and Brevibacterium sp. strain CR3/1/15 (1/15), were examined over a range of temperatures in both batch culture and…1 June, 1994 by Peter Convey, William Block
We report the first detailed study of the terrestrial invertebrate fauna of the Byers Peninsula SSSI, Livingston Island, South Shetland Islands. Fourteen micro-arthropod taxa (10 Acari, four Collembola) and two…1 June, 1994 by Paul Rodhouse
Martialia hyadesi were collected from fishing vessels at the Antarctic Polar Frontal Zone (APFZ) and the Patagonian Shelf Edge (PASE) during the 1989 austral autumn and winter. Squid were measured,…1 June, 1994
Competition between two psychrotolerant bacteria was examined in glycerol-limited chemostat experiments subjected to non-steady-state conditions of temperature. One bacterium, a Brevibacterium sp. strain designated CR3/1/15, responded rapidly to temperature change,…1 June, 1994
Late Cenozoic, subglacially erupted volcanic sequences are scattered throughout the Antarctic Peninsula. Two of the best preserved examples, at Mount Pinafore (Alexander Island; c. 5.5–6 Ma) and Brown Bluff (Graham…1 June, 1994
Line-of-sight Doppler velocity V∗ and three-dimensional apparent echolocation (XL, YL, ZL), are among the principal parameters available for each ionospheric echo from most observing modes of the dynasonde. An ensemble…Read more on High-resolution vector velocity determinations from the dynasonde
1 May, 1994 by John King
Surface air temperature records from stations on the west coast of the Antarctic Peninsula show a higher degree of interannual variability and stronger long-term warming trends than recorded elsewhere in…Read more on Recent climate variability in the vicinity of the antarctic peninsula
1 May, 1994
The diet composition and feeding intensity of mackerel icefish Champsocephalus gunnari around Shag Rocks and the mainland of South Georgia was analyzed from ca 8700 stomachs collected in January/February 1985,…1 May, 1994
The release of altimetric data from the Geosat Geodetic Mission by the US Navy [1] is leading to a much-improved understanding of tectonics in the Southern Ocean, a region in…Read more on Scotia Sea tectonics from high-resolution satellite gravity
1 May, 1994 by Eric Wolff
Lead concentrations from an Antarctic snow pit show the pattern of Pb reaching the Antarctic atmosphere over the last 70 years. Between 1920 and 1950, the Pb concentration shows significant…Read more on Antarctic snow record of southern hemisphere lead pollution
1 April, 1994 by John King
We present eddy-correlation measurements of heat and water vapour fluxes made during the Antarctic winter. The surface layer was stably stratified throughout the period of observation and sensible heat fluxes…Read more on Heat and water vapour fluxes and scalar roughness lengths over an Antarctic ice shelf
1 April, 1994
The assimilative mapping of ionospheric electrodynamics technique has been used to derive the large-scale high-latitude ionospheric convection patterns simultaneously in both northern and southern hemispheres during the period of January…Read more on Interhemispheric asymmetry of the high-latitude ionospheric convection pattern
1 April, 1994 by Eric Wolff
Electrical and chemical analysis of the GRIP ice core from Summit in central Greenland confirms that the ECM current is controlled solely by acids in the ice, though there could…1 April, 1994 by Michael Pinnock
Polar patches are regions within the polar cap where the F-region electron concentration and airglow emission at 630 nm are enhanced above a background level. Previous observations have demonstrated that…1 March, 1994
The near Earth space environment (known as Geospace) is dominated by the interaction between the solar wind and the geomagnetic field, which creates the magnetosphere. Considerable energy flows from the…Read more on The Southern Hemisphere Auroral Radar Experiment (SHARE)
1 March, 1994
Within the Jones Mountains, which form part of the Thurston Island crustal block, up to 700 m of Miocene (c. 10 Ma) pillow basalt and palagonitized volcaniclastic rocks unconformably overlie…1 March, 1994
A 215-m ice core has penetrated the central part of the Ronne Ice Shelf (76°59′S, 52°16′W). The core consisted of meteoric ice above 152.8-m depth; below this the ice was…1 March, 1994
Approximately 70 species out of a total of more than 520 Acari recorded from Antarctica and the sub-Antarctic islands may originate from other continents, especially Australasia, South America and Europe.…Read more on Non-indigenous Acari of Antarctica and the sub-Antarctic islands
1 March, 1994
The occurrence and distribution of the South Georgia fungal flora, particularly Ascomycotina and Basidiomycotina, is assessed in terms of habitat and substrate preference. The 113 taxa reported comprise 37 basidiomycetes,…Read more on Species diversity and resource relationships of South Georgian fungi
1 March, 1994
It is hard to divorce most human activities, including science, completely from politics. Politics is about perceived certainty whilst science is about doubt – they make strange bedfellows. Politicians detest…Read more on Providing expert scientific advice on the Antarctic environment [editorial]
1 March, 1994 by Mervyn Freeman
Both the injection of energetic particles at geostationary orbit and ground magnetic observations of Pi 2 wave activity are characteristic indicators of the onset of the substorm expansion phase. Occurrence…1 February, 1994
An oxygen stable isotope study of molluscan macrofossils from the Tithonian to the Eocene of the James Ross Island and Alexander Island areas, Antarctica, was carried out in conjunction with…1 February, 1994 by Philip Leat
The Mesozoic LeMay Group accretionary complex of Alexander Island, Antarctica, contains thrust-bound slices of accreted ocean floor, ocean islands and seamounts. They represent fragments of proto-Pacific oceanic crust, of which…1 February, 1994
The spatial extent and temporal behaviour of quasi-periodic (QP) intensity modulations of 0.5-2 kHz ELF-VLF signals were investigated in a comparative study of data collected at the Antarctic stations of…1 January, 1994
A method for extending the calibrated temperature rang of a solid-state capacitive humidity sensor is presented. This technique is applicable to relative humidity instruments that are based around solid-state sensors.Read more on A method for rescaling humidity sensors at temperatures well below freezing
1 January, 1994
Southern elephant seals Mirounga leonina display extreme sexual dimorphism. In addition females show great variation in size and stored resources at parturition. Therefore they present an excellent opportunity for examination…1 January, 1994
During seven days of operations involving the setting and hauling of longlines to catch the toothfish Dissostichus eleginoides around the South Sandwich Islands, actual and potential interactions with seabirds were…1 January, 1994
During the austral midsummers of 1989/1990 and 1990/1991, seven grazing experiments were undertaken near South Georgia. The copepods spanned 3 orders of magnitude in body mass, from young copepodids of…1 January, 1994 by Mark Clilverd
Data from the VLF Doppler experiment at Faraday, Antarctica (65○ S, 64○ W) are used to study the penetration of the high-latitude convection electric field to lower latitudes during severely…1 January, 1994
Results from a mathematical model provide a description of the mid-latitude, low L-shell ionosphere and plasmasphere. Variations in the composition and dynamics of the plasmasphere and changes in the nature…Read more on The effect of disturbed-time electric fields on the inner plasmasphere
1 January, 1994
Mie scattering models suggest that the thermal infrared emissivity of snow is relatively insensitive to variations in its properties and is dependent, primarily, on viewing angle. This gives rise to…Read more on The atmospheric correction for satellite infrared radiometer data in polar regions
1 January, 1994 by Andrew Clarke, David Barnes
Many areas of the Antarctic continental shelf support rich communities of benthic suspension feeders, of which Bryozoa are frequently an important component. These communities inhabit an environment characterised by a…1 January, 1994
A thick, largely shallow marine succession of Cretaceous and Lower Tertiary strata, deposited in the James Ross Basin, is well exposed on an archipelago of islands at the northern end…1 January, 1994
Two new mite species, Halacarellus porellus n.sp. and H. novellus n.sp., are described. Both species were collected from the littoral zone in a sheltered bay on the northeast coast of…Read more on Two new species ofHalacarellus(Halacaridae: Acari) from South Georgia
1 January, 1994
Heart rates (fh) and rates of oxygen consumption (V(dot)O2) were measured in eight black-browed albatrosses (Diomedea melanophrys) when walking on a treadmill, with the aim of using fh to predict…1 January, 1994 by Roger Worland, William Block
Ecophysiological characteristics, including survival at high and low temperatures, locomotory activity at sub-zero temperatures, supercooling ability and oxygen consumption rates, were investigated for the Arctic springtail Onychiurus arcticus (Tullberg) (Collembola,…Read more on Thermal adaptation in the Arctic collembolan Onychiurus arcticus (Tullberg)
1 January, 1994 by William Block
Scientific reasons for the study of terrestrial ecosystems in the Antarctic are outlined together with brief descriptions of the maritime and continental zones. Opportunities for ecological research are highlighted in…1 January, 1994
1. Foraging behaviour of Antarctic fur seals rearing pups at Bird Island, South Georgia, was assessed using at-sea activity patterns measured by electronic time-depth recorders. Information was obtained for a…Read more on Foraging behaviour of Antarctic fur seals during periods of contrasting prey abundance
1 January, 1994 by Andrew Clarke, Lloyd Peck
The marked seasonality of high latitude marine ecosystems means that the relationship between nutrition and metabolism is of particular interest, for many polar organisms must survive long periods without food.…1 January, 1994 by Andrew Clarke, Paul Rodhouse
The proximate (protein, lipid, carbohydrate and ash) and elemental (C, H, N and P) composition of the major tissues were measured for 18 male and 51 female Illex argentinus sampled…1 January, 1994 by Andrew Clarke
Excretion of ammonia, urea and primary amines (assayed as fluorescamine-positive substances, FPS) was measured in the Antarctic limpet Nacella concinna. The mean contributions to overall excretion rate were 89% ammonia,…Read more on Nitrogen excretion in the Antarctic limpet Nacella concinna (Strebel, 1908)
1 January, 1994 by Paul Rodhouse
Stomach contents of Loligo forbesi obtained from commercial landings and research cruises in Irish waters and the Irish Sea were examined. A total of 62.3% of stomachs were empty. Fish…Read more on Diet of the squid Loligo forbesi Steenstrup (Cephalopoda: Loliginidae) in Irish waters
1 January, 1994
We examine some aspects of the performance of the United Kingdom Meteorological Office's new climate model over Antarctica. Pressure and temperature fields are presented as a basic check on the…Read more on The Antarctic climate of the UKMO Unified Model
1 January, 1994 by Peter Convey
Growth and mortality rates of three juvenile instars and adults of the oribatid mite Alaskozetes antarcticus were measured over a twelve month period using field enclosures m Its maritime Antarctic…Read more on Growth and survival strategy of the Antarctic mite Alaskozetes antarcticus
1 January, 1994 by Peter Convey
A comparison is made of the reproductive effort (RE), considered as the investment in sporophyte relative to gametophyte biomass, of eight species of moss occurring at sub-and maritime Antarctic sites.…Read more on Modelling reproductive effort in sub-and maritime Antarctic mosses
1 January, 1994 by Peter Convey
Rates of dark respiration (DR), gross photosynthesis (GPS) and net photosynthesis (NPS) were investigated for 14 species of moss from a maritime Antarctic locality. The rates found were similar to…Read more on Photosynthesis and dark respiration in Antarctic mosses?an initial comparative study
1 January, 1994
Snow surfaces in the polar regions have uniform reflecting properties over large areas. Slopes are usually low-in Antarctica, they rarely exceed 2/spl deg/ except in mountainous regions. Such low slopes…Read more on A simple shape-from-shading algorithm applied to images of ice-covered terrain
1 January, 1994 by Alistair Crame
One of the most important breakthroughs in Antarctic geological research over the last three decades has been the elucidation of the continent’s fossil record. Although fossils have been known since…1 January, 1994
Thermospheric winds on a total of 237 nights have been studied for the effects due to geomagnetic activity, solar flux, and season. The observations have been made from 1988 to…Read more on Mean thermospheric winds observed from Halley, Antarctica
1 January, 1994
The Antarctic marine ecosystem is proposed as an environment in which to monitor global hydrocarbon background levels. Hydrocarbon concentrations are probably uniform throughout the Southern Ocean and it is difficult…Read more on Hydrocarbons in the Antarctic marine environment: monitoring and background
1 January, 1994
For many albatross species squid are important prey. Whether albatrosses depend on scavenging (e.g. of vomit from cetaceans, post-spawning die-offs or fishery waste) or on live-capture of squid (e.g. via…Read more on Dead or alive, night or day: how do albatrosses catch squid?
1 January, 1994
Eleven species of Achnanthes from Signy Island, South Orkney Islands are described including one new species. Benthic algal material from a range of shallow lakes of varying trophic status was…Read more on Taxonomic studies of Achnanthes(Bacillariophyta) in freshwater maritime antarctic lakes
1 January, 1994 by Sandra McInnes, Sandra McInnes
Hexapodibius boothi sp.n., a new species of semi-terrestrial tardigrade from fellfield mineral soil material at the Dundee Island (in the Maritime Antarctic) is described.1 January, 1994
The International Geophysical Year of 1957–58 demonstrated the effective use of the Antarctic for peaceful international scientific activity, and the Antarctic Treaty of 1961 acknowledges the important contribution of science.…1 January, 1994
Ovarian maturation in Notothenia coriiceps is known to include a period during which yolk deposition begins to take place. This ‘adolescent’ phase was thought originally to last for about 1…