Found 14065 items
1 July, 1997
The diets of six of the main seabird species (two petrels, two albatrosses, two penguins) breeding at Bird Island, South Georgia were studied simultaneously during the chick-rearing period in 1986.…Read more on Dietary segregation of krill-eating South Georgia seabirds
1 July, 1997
Mackerel icefish Champsocephalus gunnari are widespread on the South Georgia (54° S, 36° W) shelf. Analysis of condition indicated a strong interannual variation. High condition indices, indicative of good feeding…Read more on Interannual variation in condition of the mackerel icefish
1 July, 1997
We investigated the relationship between surface-foraging prions Pachyptila spp. and their zooplankton prey by comparing counts of foraging birds with near-surface concentrations of zooplankton from net samples. Zooplankton abundance was…1 July, 1997
Upper Jurassic-Lower Cretaceous rocks of the Byers Group, exposed on Byers Peninsula, Livingston Island, record the expansion of Gondwana-margin continental-arc facies into a marine intra-arc basin. At least 1.3 km…1 July, 1997
Fore-arc magmatic sequences associated with high Mg number andesite lavas unconformably overlie LeMay Group accretionary complex in Alexander Island. High-resolution 40Ar/39Ar, U–Pb zircon, fission track and K–Ar ages demonstrate that…Read more on The age and stratigraphy of fore-arc megmatism on Alexander Island, Antarctica
1 July, 1997
King Penguins Aptenodytes patagonicus which were rearing chicks were studied during three summers from November 1991 to March 1994 at South Georgia. Stomach samples (n=115) collected by flushing had a…Read more on Diet of the King Penguin Aptenodytes patagonicus during three summers at South Georgia
1 July, 1997 by Lloyd Peck
Summer and winter growth rates were assessed separately for a population of the Antarctic brachiopod Liothyrella uva between early January 1992 and December 1993. Annual shell growth rates (1.6–2.3 mm…Read more on Growth and metabolism in the Antarctic brachiopod Liothyrella uva
1 July, 1997
Pliocene–Recent volcanic outcrops at Seal Nunataks and Beethoven Peninsula (Antarctic Peninsula) are remnants of several monogenetic volcanoes formed by eruption of vesiculating basaltic magma into shallow water, in an englacial…30 June, 1997 by Michael Pinnock
We utilise high-time resolution measurements from the PACE HF radar at Halley, Antarctica to explore the evolution of the ionospheric response during the first few minutes after enhanced reconnection occurs…Read more on The ionospheric response to flux transfer events: the first few minutes
12 June, 1997
Growth in Antarctic fishes is assumed to be seasonal but quantitative data are scarce. Growth rates in juvenile Notothenia coriiceps, a typical Antarctic fish, were measured using mark–recapture techniques and…Read more on Seasonal and annual growth rates in the Antarctic fish Notothenia coriiceps Richardson
1 June, 1997
The hypothesis that rates of carbon exchange and recovery following dehydration by Antarctic bryophytes are related to habitat water availability was investigated. Carbon fixation was measured using an infra-red gas…1 June, 1997 by Paul Rodhouse, Philip Trathan
The seven star flying squid Martialia hyadesi is an oceanic slope ommastrephid with a circumpolar distribution associated with the Antarctic Polar Frontal Zone (APFZ) and is a minor, variable catch…1 June, 1997
A series of benches on nunataks of Alexander Island (Antarctica) are described. An increase in bench size with distance away from the retreating glacier suggests an age spectrum. The benches…Read more on Observations on “cryoplanation” benches in Antarctica
1 June, 1997 by Richard Horne
We investigate the absorption of electromagnetic ion cyclotron (EMIC) wave energy by He+ in the outer magnetosphere and the subsequent perpendicular-heating of He+. Plasma models, based on satellite data, are…1 June, 1997 by Andy Smith
Seismic reflection measurements of ice thickness and water-column thickness have been made over the southern and western Ronne Ice Shelf, from which, the seabed elevation has been determined. A 2300…1 June, 1997
A detailed frequency analysis of the azimuthal bearing of ground-observed whistlers by the modified MFPE method (Lichtenberger et al., 1987) based on two and three component digital recordings is presented.…1 June, 1997
Studies of the otariids (fur seals and sea lions), a highly sexually dimorphic group, have provided conflicting evidence of differential maternal expenditure in male and female offspring and, thus, suggestions…Read more on Maternal investment in Antarctic fur seals: evidence for equality in the sexes?
1 June, 1997 by Gareth Marshall, John Turner
Wind fields derived from ERS-1 scatterometer data, acquired over the open water present in the western Ross Sea during the summer season, are used to study the patterns of mesoscale…1 June, 1997 by Gareth Marshall, John Turner
The effectiveness of ERS 1 scatterometer data as a tool for studying the wind fields of Antarctic mesocyclones is analyzed by using 1 year's observations of these systems derived from…Read more on Surface wind fields of Antarctic mesocyclones derived from ERS 1 scatterometer data
1 June, 1997
Airborne fungal spores were monitored over periods of up to 131/2 months at three sites on Signy Island in the maritime Antarctic. Fungal spore concentrations in the air were much…Read more on Seasonality in Antarctic airborne fungal spores
1 June, 1997
Late Cretaceous–early Tertiary subduction-related fore-arc volcanic rocks are exposed in a north–south linear belt along the length of Alexander Island. The age and tectonic setting of these rocks is well…1 June, 1997 by Howard Roscoe
Summertime measurements Of NO2 vertical column amounts over a 5 year period from May 1990 until February 1995 from Faraday Base, Antarctica, show a marked reduction following the arrival of…1 June, 1997 by John Turner, Steve Colwell
Observations of precipitation events at Faraday and Rothera Stations are analyzed to investigate the spatial and temporal variability of precipitation along the western coastal (Pacific) side of the Antarctic Peninsula.…1 June, 1997
Human contamination of Antarctic environments is a sensitive issue and has been the focus of many research articles over the past 35 years. The majority of these studies have targeted…Read more on Detection of human commensals in the area around an Antarctic research station
1 June, 1997
The application of kites as a platform for meteorological measurement within the boundary layer is examined. Kites are shown to fulfil a useful role within this research area, particularly when…Read more on The use of kites to investigate boundary layer meteorology
1 June, 1997
Subduction-related Mesozoic to Cainozoic granites s.l. in western Palmer Land, Antarctic Peninsula, have similar chemical compositions to Archean tonalite-trondhjemite-granodiorite (TTG) suites, Phanerozoic slab-melts (adakites), and to experimental partial melts of…Read more on The generation of sodic granite magmas, western Palmer Land, Antarctic Peninsula
1 June, 1997 by Mark Preston
Modern instruments and techniques used to collect nutrient data at sea may amass huge data sets from discrete samples and continuously monitored sample streams. The volume and format of data…1 June, 1997 by Andrew Clarke
Haemolymph samples were withdrawn from routinely active male intermoult Glyptonotus held at 0 ± 0.5°C, and analysed for blood-gas and acid-base variables. In both the arterialised (a) and venous (v) haemolymph, over…Read more on Haemolymph oxygen transport and acid-base status in Glyptonotus antarcticus Eights
1 May, 1997 by David Barnes, Lloyd Peck
Thirty-five specimens of the articulate brachiopod Neorhynchia strebeli were collected from a site at 814 m in the Weddell Sea. This was only the second species of the order Rhynchonellida…Read more on An Antarctic shelf population of the deep-sea, Pacific brachiopod Neorhynchia strebeli
1 May, 1997 by Peter Convey
Christensenia gen. nov., C. blocki sp. nov., is described from Signy Island, South Orkney Islands, maritime Antarctic. The new species is identical with specimens that Stephenson (1932) determined as Marionina…Read more on Christensenia , a new terrestrial enchytraeid genus from Antarctica
1 May, 1997
An explanation is sought for the marked variation in maximum sea ice extent observed between 2 years in the 2 areas of greatest interannual variability in winter ice extent in…1 May, 1997
Ground-based observations of Pc1 geomagnetic pulsations propagating in the ionosphere over Halley (76 °S, 27 °W, L ~ 4.2), Antarctica, have been made. The direction of propagation of the Pc1…Read more on Dynasonde observations of Pc1 propagation in the ionosphere
1 May, 1997
Magnetic, gravity and bathymetric data from Marguerite Bay are used to study the relationships between oceanic and continental tectonic evolution in the arc and fore-arc of the Antarctic Peninsula. The…1 May, 1997 by Howard Roscoe
Measurements of trace gases and photolysis rates in the troposphere are essential for understanding photochemical smog and global environmental change. Chemical measurement techniques have progressed enormously since the first regular…1 May, 1997 by David Barnes
Identity, quantity and seasonal variation in recruiting invertebrate larvae were investigated at Signy Island, Antarctica. Nine settlement panels were deployed at each of three sites at depths ranging between five…1 May, 1997 by Eugene Murphy, Philip Trathan
The Polar Front (PF) forms the southern boundary to the Polar Frontal Zone (PFZ) along the northern edge of the Antarctic Circumpolar Current (ACC). In a number of areas the…1 April, 1997 by Alistair Crame
The last inoceramid bivalves in Antarctica are no younger than mid- to late Campanian in age. They occur within the Herbert Sound and Rabot Point members of the Santa Marta…1 April, 1997
The interaction between a large-scale isolated wave and turbulence is considered in the context of the stable atmospheric boundary layer. A two-dimensional model with a second-moment turbulence closure is used…1 April, 1997
Turbulence measurements of the stable atmospheric boundary layer made at Halley station in Antarctica are presented. the interaction between small-scale turbulence and larger solitary wave disturbances is investigated. Spectral methods…1 April, 1997 by Adrian Fox
Using a multidisciplinary project studying surging glaciers in Svalbard as a reference, this paper examines some of the ways in which photogrammetry can be used as a research tool by…Read more on Photogrammetry as a research tool for glaciology
1 April, 1997
The eastward-flowing Antarctic Circumpolar Current (ACC) has influenced sedimentation on the slope and floor of the western Falkland Trough, where the axis of the current is topographically constrained. Deep-water flow…1 April, 1997
In order to operate successfully and reliably in inhospitable polar climates, an aerobiological sampler requires a number of characteristics. It must sample a large volume of air, sample extremes of…Read more on Laboratory evaluation of a new aerobiological sampler for use in the Antarctic
1 April, 1997
A quarter of the terrestrial Acari recorded from Antarctica and the sub-Antarctic islands are parasitic haematophages or non-feeding phoretics associated with other larger and more mobile animals, especially sea birds…1 April, 1997 by William Block
Nine species of oribatid mites were represented in heat-extracted samples of soil and plant material and from pitfall trapping in the five main terrestrial plant communities on Heard Isl. Three…Read more on Oribatid mites (Acari: Oribatida) of sub-Antarctic Heard Island
31 March, 1997
In the past the global, fully coupled, time-dependent mathematical model of the Earth’s thermo-sphere/ionosphere/plasmasphere (CTIP) has been unable to reproduce accurately observed values of the maximum plasma frequency, foF2, at…1 March, 1997
We discuss a set of coordinated observations from the arrays of Greenland ground magnetometers, Sondrestrom incoherent scatter radar, and the DMSP, GOES 7, and IMP 8 satellites during 1000–1400 UT…1 March, 1997 by Peter Convey
We report the composition of terrestrial arthropod collections made at Cierva Point Site of Special Scientific Interest, Dance Coast (northern Antarctic Peninsula, 64 degrees 10'S - 60 degrees 57'W), during…1 March, 1997 by Peter Convey
Field surveys of free-living terrestrial microarthropods were made during the 1994–95 summer at four sites in northern Marguerite Bay (Anchorage Island, Lagoon Island, Léonie Island, Rothera Point; c. 68°S, 68°W)…1 March, 1997
The effects of dehydration and rehydration on carbon exchange in 14 bryophytes from the maritime Antarctic were investigated using an infra-red gas analysis system. Continuous long-term (1–12 months) and repeated…1 March, 1997
Strontium isotope stratigraphy is used to date two interglacial-marine deposits in the Antarctic Peninsula region. On King George Island, interglacial pectinid-rich sediments in the Low Head Member of the Polonez…1 March, 1997 by Richard Hindmarsh, Richard Hindmarsh
A linearized perturbation about the Vialov-Nye fixed-span solution for a steady-state ice sheet yields a Sturm-Liouville problem. The numerical eigenvalue problem is solved and the resulting normal modes are used…1 March, 1997 by John Turner
The performance of the UK Meteorological Office operational numerical weather prediction system in the Antarctic is examined. The analysis/forecast model currently has a reasonable representation of the atmospheric circulation, although…1 March, 1997 by Mervyn Freeman
We capitalise on the very large field of view of the Halley HF radar to provide a comprehensive description of the electric field response to the substorm growth phase and…1 March, 1997 by Philip Leat
Mafic dykes (Groups A–D) intruded into Mesoproterozoic basement amphibolites, gneisses, and granitoids of the Cape Meredith Complex on the southern tip of West Falkland, provide an important record of at…25 February, 1997
Four feeding trials were conducted on captive juvenile N. coriiceps maintained under conditions simulating natural seasonal changes in temperature and photoperiod. Fish were deprived of food for 10 days (to…1 February, 1997
The South Georgian shag (Phalacrocorax georgianus) shows a remarkable diving ability comparable to that of penguins, yet nothing is known of the physiology of these birds. In this study, heart…1 February, 1997
The Ellsworth Mountains, West Antarctica, consist of two mountain ranges; the Sentinel, and Heritage ranges. The more southerly Heritage Range is composed of a lower Paleozoic sedimentary and volcanic rock…1 February, 1997
Effects of irradiance, temperature and water availability on respiration and photosynthesis in a maritime Antarctic liverwort, Marchantia berteroana, were investigated. Carbon dioxide exchange was measured using an infra-red gas analysis…1 February, 1997 by Alistair Crame
Key exposures through the Late Cretaceous (Campanian-Maastrichtian) Marambio Group are located in the Admiralty Sound region, James Ross Island group, Antarctica. On southern James Ross Island, an extensive sequence of…1 February, 1997
Shoreline plant and animal communities close to a retreating tidewater glacier on the sub-Antarctic island of South Georgia displayed a series of physical and biological gradients from the open sea…1 February, 1997
Magnetic profiles obtained during the Hesant 92/93 cruise with the R/V Hesperides show large amplitude anomalies (up to 1000 nT) along a 100 km wide band in the northern margin…1 January, 1997 by Paul Rodhouse
Samples of the Antarctic octopus Pareledone turqueti were taken from three locations on the Scotia Ridge in the Southern Ocean. The genetic homogeneity of these populations was investigated using isozyme…1 January, 1997
Southern elephant seals Mirounga leonina provide a unique opportunity for examination of parental investment because postpartum pup growth is fueled exclusively by energy from stored reserves in fasting mothers, and…Read more on Factors affecting maternal expenditure in southern elephant seals during lactation
1 January, 1997
The timing, location and duration of territorial tenure, and the mating success and return rates of male Antarctic fur seals (Arctocephalus gazella) were measured over four consecutive breeding seasons (1984–87)…1 January, 1997 by Peter Ward
All suitable data from the Atlantic sector of the Southern Ocean were compiled to elucidate regional differences in the abundance and life cycle of Calanoides acutus. Data from 205 stations…1 January, 1997
Feeding by juvenile Antarctic krill Euphausia superba near South Georgia was assessed during the austral summer of 1995/1996. Gut fluorescence results were compared with those from incubations in natural seawater…1 January, 1997 by Peter Kirsch
In the frame of the Second European Stratospheric Arctic and Midlatitude Experiment an intensive program of spectral measurements of global solar UV radiation was organized at several European sites, extending…1 January, 1997
Goose Bay HF-radar data have been used to determine the dayside reconnection electric field which transports energy from the solar wind into the Earth's magnetosphere and ionosphere. The speed of…1 January, 1997 by Andrew Clarke
The feeding energetics of the Antarctic spiny plunderfish (Harpagifer antarcticus) were examined with respect to the effect of both ration size and animal size. Fish of different sizes were fed…1 January, 1997
Seasonally breeding predators, which are limited in the time available for provisioning young at a central location, and by the fasting abilities of the young, are likely to maximize energy…1 January, 1997
Recent measurements of remarkable dive performances in oceanic seabirds and marine mammals suggest the use of a range of physiological and behavioural adaptations for the parsimonious use of oxygen. Access…Read more on The behavioural and physiological ecology of diving
1 January, 1997 by Jonathan Watkins
Interannual variability within the pelagic marine environment around South Georgia is a well-recognised phenomenon. A key aspect of this variability is interannual fluctuation in the abundance of Antarctic krill Euphausia…Read more on Interannual variability in krill abundance at South Georgia
1 January, 1997
We present two time series of bottom current and temperature collected 8 m above the seabed on either side of a large sediment drift located on the continental rise of…1 January, 1997
The presence of Ashicaulis livingstonensis sp. nov. in the Upper Cretaceous Williams Point Beds of Livingston Island, Antarctica, represents an important new record of the Osmundaceae in the southern high…1 January, 1997
Hepatophytes form an important component of the Lower Cretaceous (late Albian) flora of Alexander Island, Antarctica. The liverworts Marchantites rosulatus sp. nov., Thallites bicostatus sp. nov., and Thallites sp. colonized…1 January, 1997
Subionospheric very low frequency and low-frequency (VLF/LF) transmitter signals received at middle-latitude ground stations at nighttime were found to exhibit pulsating behavior with periods that were typically in the ∼5–60…1 January, 1997
A general study of the streams of Signy Island, South Orkney Islands, was undertaken to identify the effects of catchment, distance from source, and time on concentrations of dissolved ions.…Read more on Chemistry of streams of Signy Island, maritime Antarctic: sources of major ions
1 January, 1997
Oxygen uptake of Paractora dreuxi (apterous) from Marion Island, which lies to the north of the Antarctic Polar Front, was compared to that of P. trichosterna (macropterous) and Antrops truncipennis…1 January, 1997 by William Block
South Georgia has many introduced plant and animal species, a consequence of its long history of human habitation. Introduced reindeer have a strong effect on the vegetation of the Stromness…1 January, 1997
The emplacement mechanism, geometry, and isotope geochemistry of plutons of the Wiley Glacier complex suggest that new continental crust grew by multiple injection of tonalitic dykes during dextral transtension in…1 January, 1997 by Alistair Crame
Abstract: Our knowledge of the nature, generation and maintenance of largescale biodiversity patterns is still far from complete. This is particularly so in the Southern Hemisphere and in the marine…Read more on An evolutionary framework for the polar regions