Showing 9301 items
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
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
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…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
RbSr and SmNd analyses, as well as a few new KAr dates, are presented for plutonic igneous, meta-igneous and metasedimentary rocks from the central Black Coast area of eastern Palmer…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