Showing 11862 items
1 January, 1994
The number of individual plants and colonies of the two native Antarctic vascular plants, Colobanthus quitensis and Deschampsia antarctica, have been monitored between 1964 and 1990 on three islands in…1 January, 1994 by Mervyn Freeman, Michael Pinnock
A discussion is given of plasma flows in the dawn and nightside high-latitude ionospheric regions during substorms occurring on a contracted auroral oval, as observed using the EISCAT CP-4-A experiment.…1 January, 1994 by Paul Rodhouse
Four research surveys of Falkland Island waters were carried out to determine the distribution and abundance of the early life-history stages of Loligo gahi (d'Orbigny, 1835) in the austral winter…Read more on Distribution and abundance of juvenile Loligo gahi in Falkland Island waters
1 January, 1994 by William Block
The feeding biology of the arctic collembolan Onychiurus arcticus (Tullberg) is described from West Spitsbergen, based on a combination of gut content analyses for field collected and microcosm-living animals, together…1 January, 1994
A 15 km2 body of metabasite with occasional pillow structures occurs within the Paleozoic accretionary complex in Isla Italia and Isla Dring. Trace elements and REE geochemistry indicate similarities between…1 January, 1994
Passive cloches were deployed at three altitudinally distinct sites on Signy Island, maritime Antarctica, to investigate the effect of ameliorated thermal environment upon fellfield microarthropod communities Temperature was monitored at…1 January, 1994 by Andrew Clarke
The abundance and biomass of marine planktonic ciliates in Borge Bay, Signy Island, were determined at monthly intervals between April 1990 and June 1991. At least 24 different ciliate taxa…Read more on The annual cycle of planktonic ciliates in nearshore waters at Signy Island, Antarctica
1 January, 1994 by Sandra McInnes, Sandra McInnes
The literature on terrestrial and freshwater Tardigrada is relatively limited, being concerned with 617 species world wide. Many of the references are in obscure publications. This paper attempts to bring…1 January, 1994
Field data from south-eastern Alexander Island, Antarctica, are used to develop a model for the formation of asymmetrical valley-side slopes. Enhanced weathering and transport causes reduction in the gradient of…1 January, 1994
We describe how to age immature Black-browed Diomedea melanophris and Grey-headed Albatrosses D. chrysostoma up to age 6 years (when they have usually acquired adult characteristics), from a combination of…1 January, 1994 by Robert Larter
Side-scan sonar and sub-bottom acoustic profiler data and sediment cores reveal the processes that controlled sediment transport and deposition on the continental shelf of the Antarctic Peninsula Pacific margin off…Read more on Ice sheet retreat from the Antarctic Peninsula shelf
1 January, 1994
Supercooling point is correlated with total body water content in a wide range of terrestrial Acari from Antarctic, sub-Antarctic and temperate regions, which have not been cold-hardened by prior exposure…1 January, 1994
Neither the benthic Halacaroidea nor nektonic Hydrachnidia, characteristic of temperate and tropical freshwater mite faunas are represented among the twenty four species and sub-species of Acari recorded from the Antarctic…1 January, 1994 by Keith Makinson, Keith Nicholls
Oceanographic data have been obtained from beneath the Ronne Ice Shelf at a site on the southeastern side of a sea-floor trough, the Ronne Depression. The data consist of 5…Read more on The oceanic environment beneath the northwest Ronne Ice Shelf, Antarctica
1 January, 1994 by Michael Pinnock
The presence of polar patches as observed simultaneously in the same magnetic meridian of opposite nightside ionospheres by coherent and incoherent scatter radars are described. The patches appear to be…1 January, 1994 by Eugene Murphy, Paul Rodhouse
An RMT 25 opening/closing net was used to sample the nekton community at 2 stations in the ice free zone (IFZ) of the Scotia Sea (Stn 1 approximately 10 nautical…1 January, 1994 by Howard Roscoe
A new UV–visible spectrometer system that measures the absorption of light from stars and planets by constituents in the Earth’s atmosphere is described. Because it can be used to make…Read more on Using stars for remote sensing of the Earth’s stratosphere
1 January, 1994 by David Vaughan
A satellite-image map with surface-elevation contours of Filchner Ronne Ice Shelf has been published previously as a topographic map. The image map was constructed from a mosaic of 69 Landsat…1 January, 1994 by Andy Smith
Seismic measurements of ice- and water column thickness have been made on Rudard Ice Stream where it joins the Ronne Ice Shelf. Assuming that the ice is in hydrostatic equilibrium,…Read more on Sea-bed depths at the mouth of Rutford Ice Stream, Antarctica
1 January, 1994
Geochronological, isotopic and aeromagnetic data, including a new Rb-Sr isochron of 1076 ± 7 Ma for volcanic rocks at Bertrab Nunatak, Coats Land, confirm the existence of rocks of Grenvillian…Read more on The Grenville Province within Antarctica: a test of the SWEAT hypothesis
1 January, 1994
References Citations Metrics Reprints & Permissions Get access Abstract A study of modern pelagic subarctic Pacific phytoplankton has revealed the presence of three distinct species of Proboscia Sundstrom,…1 January, 1994 by Robert Mulvaney
A 480 year record of the oxygen-isotope ratios, dust content, chemical species and net accumulation from ice cores drilled in 1989 90 on Dyer Plateau in the Antarctic Peninsula is…1 January, 1994 by David Vaughan
The positions of ice-stream grounding zones are uniquely sensitive to changes in the mass balance of the ice sheet. Present methods for locating groundingzone features are either imprecise or require…Read more on Investigating tidal flexure on an ice shelf using kinematic GPS
1 January, 1994 by Philip Trathan
Data from the FIBEX acoustic survey in the West Atlantic sector have been re-examined to check the consistency of krill abundance estimates derived from different survey vessels. There is a…Read more on Status of the FIBEX acoustic data from the West Atlantic
1 January, 1994
Rb Sr and Sm Nd analyses, as well as a few new K Ar dates, are presented for plutonic igneous, meta-igneous and metasedimentary rocks from the central Black Coast area…1 January, 1994
The Protocol on Environmental Protection to the Antarctic Treaty (1991) requires the environmental monitoring of human activities carried out in Antarctica. The objective of such monitoring is to collect environmental…1 January, 1994 by Eric Wolff
A snow crystal has been successfully collected on to a scanning electron microscope (SEM) stub in central Greenland. It was preserved at liquid-nitrogen temperature for 5 months, prior to examination…Read more on Capture and scanning electron microscopy of individual snow crystals
1 January, 1994 by Roger Worland, William Block
1. An automatic respirometer is described which has been developed to measure the rate of oxygen consumption by small arthropods in closed chambers. 2. The instrument removes 0.5 mul subsamples…Read more on An Automatic Respirometer for use with Small Invertebrates
1 January, 1994
The observed polarisation of the horizontal magnetic components of whistler mode signals received at Halley, Antarctica (L≈ 4.3), is in many cases that expected from a simple model of the…Read more on The polarisation of whistlers received on the ground near L = 4
1 January, 1994
Halley is a scientific station on the Brunt Ice Shelf, Antarctica. The three main buildings are wooden single-storey structures supported about 5 metres above the snow surface by steel platforms…Read more on The performance of a surface station on an Antarctic ice shelf
1 December, 1993
Maritime Antarctic freshwater lakes and their catchments are inherently simple systems in an environment which is characterized by strong seasonality. Such lakes offer excellent opportunities to study the interaction of…1 December, 1993 by Andrew Clarke
We report here the first comprehensive seasonal study of benthic microbial activity in an Antarctic coastal environment. Measurements were made from December 1990 to February 1992 of oxygen uptake and…1 December, 1993 by Adrian Jenkins, Keith Nicholls
Salinity and temperature measurements have been made beneath Ronne Ice Shelf, Antarctica. Access to the seawater was gained by hot-water drilling through 562 m of ice at a site 300…Read more on Temperature and salinity beneath Ronne Ice Shelf, Antarctica
1 December, 1993 by Lloyd Peck
Pedal mucus production rates were measured in the Antarctic limpet Nacella concinna (Strebel, 1908). Measurements were taken over 30-min and 24-h periods to allow the relative amounts of mucus produced…Read more on Pedal mucus production by the Antarctic limpet Nacella concinna (Strebel, 1908)
1 December, 1993 by William Block
A manipulation experiment was carried out on a field population of the aphid Acyrthosiphon svalbardicum near Ny Ålesund, on the high arctic island of Spitsbergen, using cloches to raise temperature.…1 December, 1993
THE direct-current electrical conductivity of glacial ice depends on its acidity1–3, and can also indicate changes in climate, as ice formed in cold, dusty periods has a high concentration of…Read more on Electrical conductivity measurements from the GISP2 and GRIP Greenlandice cores
1 December, 1993 by David Vaughan
Temperature records in the Antarctic Peninsula have shown a climatic warming of 1.5°C over the past 30 years and a number of ice shelves have retreated. The most dramatic retreat…Read more on Implications of the break-up of Wordie Ice Shelf, Antarctica for sea level
1 December, 1993
Data collected on four large-scale surveys around the subantarctic island of South Georgia provide information on the variability in the distribution of chlorophyll and inorganic nutrients during the austral summer…1 December, 1993
Plasma prolactin levels were measured in free-living breeding adult and immature (prebreeding) macaroni (Eudyptes chrysolophus) and gentoo (Pygoscelis papua) penguins at Bird Island, South Georgia (54°S, 38°W). Macaroni and gentoo…1 November, 1993
Data acquired during several multiday periods in 1982 at ground stations Siple, Halley, and Kerguelen and on satellites DE 1, ISEE 1, and GEOS 2 have been used to investigate…Read more on Plasmasphere dynamics in the duskside bulge region: a new look at an old topic
1 November, 1993
Several very large synsedimentary slide units exist in the well-exposed Mesozoic fore-arc sequence of Alexander Island, Antarctica. The largest single exposure, which is at least 440 m thick and more…Read more on Giant slide deposits from a Mesozoic fore-arc basin, Alexander Island, Antarctica
1 November, 1993
Cockburn Island, off the north-east Antarctic Peninsula, is important in the history of Antarctic terrestrial biology as it was here where the first botanical collections were made by JD Hooker…1 October, 1993 by Lloyd Peck
Growth rates in the infaunal nuculanid bivalve mollusc Yoldia eightsi (Couthouy) were assessed for field populations in Factory Cove, Signy Island, Antarctica, between. February and April 1992. Daily increments in…1 October, 1993
For the first time a scanned focused ion beam of approximately 50 nm diameter has been used to prepare biological material. Small defined areas of the surface were removed by…1 September, 1993 by Andrew Clarke
Data on the growth (20 species) and productivity (19 species) of Antarctic and subantarctic macrobenthos were compiled from published and unpublished sources. Differences in the production/biomass (P/B) ratio between Antarctic,…1 September, 1993 by Philip Leat
Thurston Island, and the adjacent Eights Coast and Jones Mountains, record Pacific margin magmatism from Carboniferous to Late Cretaceous times. The igneous rocks form a uniformly calc-alkaline, high-alumina, dominantly metaluminous…1 September, 1993
Two genera of dipteridaceous ferns, Goeppertella and Hausmannia, are described for the first time from the Mesozoic Hope Bay and Botany Bay assemblages of the northern Antarctic Peninsula, and Goeppertella…1 August, 1993 by Paul Rodhouse
Horizontal starch gel electrophoresis was used to investigate levels of genetic differentiation between four samples of the nominate squid species Martialia hyadesi Rochbrune and Mabille, 1889, obtained from regions of…1 August, 1993 by Andrew Clarke
1. Volume, dry mass and nutrient content were measured in eggs from four species of polar caridean shrimp (Crustacea: Decapoda): Chorismus antarcticus, Notocrangon antarcticus and Nematocarcinus lanceopes from the Weddell…1 August, 1993 by Mark Clilverd
VLF whistler mode signals received in 1986–1992 at Faraday, Antarctica (65° S, 64° W) and Dunedin, New Zealand (46° S, 171° E) show night-long decreases in occurrence which may be…1 August, 1993 by Mark Clilverd
Whistler mode signals from VLF transmitters received at Faraday, Antarctica (65° S, 64° W) during 1986–1991 show an annual variation in the number of hours over which signals are observed,…1 August, 1993 by Eric Wolff
Surface snow samples have been analysed for the heavy metals Cd, Cu, Pb and Zn to investigate the spatial scale of local sources of pollution in Antarctica. Samples from around…Read more on The local deposition of heavy metal emissions from point sources in Antarctica
1 July, 1993
New Rb-Sr and K-Ar geochronological data are presented for the majority of known pre-Cenozoic outcrops in Thurston Island, the Jones Mountains, and the western Eights Coast, which collectively represent the…Read more on The Pre-Cenozoic magmatic history of the Thurston Island Crustal Block, west Antarctica
1 July, 1993 by John Turner, Thomas Lachlan-Cope
The mesoscale (less than 100km) vortices occurring in the two polar regions are considered in terms of their geographical and seasonal distribution, satellite cloud signatures and forcing mechanisms. Environmental conditions…Read more on A comparison of Arctic and Antarctic mesoscale vortices
1 June, 1993
Satellite infra-red imagery and meteorological data suggest the presence of winter open water (polynya) in the coastal pack ice to the north and west of the Brunt Ice Shelf. Satellite…Read more on Evidence for an Antarctic winter coastal polynya
1 June, 1993 by Andrew Clarke
Egg volume and several aspects of egg nutrient content (dry mass, organic content, carbon and nitrogen content) were measured in eggs from five species of polar caridean shrimp (Crustacea; Decapoda):…Read more on Egg size and egg composition in polar shrimps (Caridea; Decapoda)
1 June, 1993
We compare the microwave and low-frequency (LF) dielectric conductivity of natural and artificial ice as a function of impurity concentration and temperature. We find a linear dependence of conductivity on…1 June, 1993 by Lloyd Peck
Embryonic and larval development were followed from fertilisation to settlement in the Antarctic heteronemertean Parborlasia corrugatus (McIntosh, 1876). The first cleavage occurred 10 to 15 h after fertilisation, and the…1 June, 1993 by Paul Rodhouse
Regurgitations were collected from 41 black-browed albatross adults feeding chicks at Bird Island (54°S 38°W), South Georgia in February 1986. The samples were sorted into recognisable food categories and weighed.…Read more on Cephalopod prey of the black-browed albatrossDiomedea melanophrys at South Georgia
1 May, 1993 by Alistair Crame
Our concept of polar marine faunas as having evolved in comparative isolation over long periods may need to be revised. New evidence from the Southern Ocean, in particular, suggests that…Read more on Latitudinal range fluctuations in the marine realm through geological time