Showing 11205 items
1 March, 1990 by Peter Ward
Euphausiid life histories and distribution in the vicinity of South Georgia were studied from a series of samples taken in April 1980, November–December 1981, and July–August 1983. Size frequency data…Read more on Euphausiid life cycles and distribution around South Georgia
1 March, 1990
The process of colonization of Antarctic fellfield soils by micro- organisms has two phases: Firstly, the immigration, survival and establishment of microbial propagules thenlselves, and secondly the stabilization of the…Read more on Microbial colonization processes in Antarctic fellfield soil – an experimental overview
1 February, 1990
Regression functions of total length on carapace length and total length on removed carapace length were calculated for Antarctic krill Euphausia superba Dana for those classes of sex and maturity…1 February, 1990
Following more than 200 Ma of subduction of Pacific oceanic crust beneath the west coast of the Antarctic Peninsula, subduction ceased by a series of ridge crest-trench collisions. However, magmatism…1 February, 1990 by Richard Horne
Three model electron distribution functions representative of the region between the plasmapause and the geostationary orbit are constructed. These models are used to compare numerical solutions of the hot electromagnetic…1 February, 1990
Coomansus gerlachei shows a strong seasonal variation in its supercooling ability, with most individuals freezing between -5° and -7°C, in a discrete high group, or between -15° and -26°C in…1 February, 1990 by Paul Rodhouse
In a recent paper (Goulletquer & Wolowicz, 1989), data are presented which show that determination of the organic content of mollusc shells by weight loss on ignition may over-estimate this…1 January, 1990
The history of the British Antarctic Survey, and of its predecessors, Operation Tabarin and Falkland Islands Dependencies Survey, is outlined. The objectives, stock, and organization of the Survey's library and…Read more on The library of the British Antarctic Survey, Cambridge
1 January, 1990
Neck collars of man-made marine debris were seen on 208 Antarctic fur seals (and removed from 170) during the 142 days of the 1988–1989 pup-rearing season at Bird Island, South…Read more on Entanglement in man-made debris of Antarctic fur seals at Bird Island, South Georgia
1 January, 1990 by Roger Worland, William Block
This paper provides an introduction to the literature on the drying of porous solids and the relevance of these drying theories to the drying of Collembola in general, and hygrophilic…1 January, 1990
New field mapping and an integrated trace element and Nd isotopic study have been undertaken on the Jurassic-Cretaceous Larsen Harbour Complex on the island of South Georgia, recognized as a…1 January, 1990
A mixture of tiletamine and zolazepam at a combined dose of 1 mg/kg was a reliable and safe agent for immobilising wild grey seals (Halichoerus grypus) and southern elephant seals…1 January, 1990 by William Block
Arthropods, as poikilotherms, adapt to cold environments in a variety of ways that include extension of locomotory activity to low temperatures, enhancement of metabolic rate and maintenance of a positive…Read more on Cold Tolerance of Insects and Other Arthropods [and Discussion]
1 January, 1990 by William Block
Dehydration experiments were conducted on individual Collembola at 0% relative humidity with the temperature ramped from 5 to 34°C at the rate of 0.5°C min−1. Continuous records of weight loss…1 January, 1990
The age distribution of breeding female Antarctic fur seals at Bird Island, South Georgia, in 1988 was compared with the age distribution of a sample obtained in 1971–1973. The mean…1 January, 1990 by Andrew Clarke
Faecal egestion and ammonia excretion were measured in the Antarctic limpet Nacella concinna (Strebel, 1908) at Signy Island during the austral summer of 1986/87. Limpets were sampled from nearby shallow…1 January, 1990 by Andrew Clarke
1. 1. The proximate (water, protein, lipid, mineral ash) and elemental (carbon, nitrogen, phosphorus) composition of eggs of the freshwater prawn Macrobrachium rosenbergii (de Man, 1879) (Crustacea, Decapoda) were determined…1 January, 1990
The aliphatic and aromatic hydrocarbon content of seawater and a selection of marine pelagic organisms from the Bransfield Strait, Antarctica were evaluated. The patterns of the hydrocarbons found indicated that…Read more on Hydrocarbons in the seawater and pelagic organisms of the Southern Ocean
1 January, 1990
Only a few years ago most interested people thought (and many said in print) that accidental killing of Antarctic animals as a consequence of commercial fishing operations was minimal to…Read more on Impact of incidental mortality on Antarctic marine vertebrates [Guest editorial]
1 January, 1990
Ringing of 20,000 Wandering Albatrosses over 30 years at Bird Island, South Georgia has produced only 81 recoveries (i.e. excluding controls), fairly evenly distributed between birds ringed as adults and…Read more on Recoveries of wandering albatrosses diomedea exulans ringed at South Georgia 1958–1986
1 January, 1990
The wandering albatross breeding population at Bird Island, South Georgia has declined since 1961 at a rate of 1.0% per annum. Similar declines have occurred elsewhere in the Subantarctic. (2)…1 January, 1990
References Citations Metrics Reprints & Permissions PDF Abstract Five species of dimitobelid belemnites are described from the Cretaceous of James Ross Island, Antarctic Peninsula. Dimitobelus (Dimitobelus) stimulus…1 January, 1990 by Jonathan Watkins
Encaged aggregations of live krill in good to pristine condition have been ensonified at 38 and 120 kHz. Concurrent underwater television observations of behavior resemble those made by underwater divers…Read more on Target strengths of Antarctic krill (Euphausia superba) at 38 and 120 kHz
1 January, 1990
The UCL-Sheffield coupled thermosphere/ionosphere model has been used to assess the consequences of a heat source from ring current ion precipitation during a geomagnetic storm. Such a source might in…1 January, 1990
By means of re‐evaluating a number of properties of rock tablets left in the field for varying time periods, an estimation of rock breakdown rates is attained. From data obtained…Read more on Mechanical weathering rates on Signy Island, maritime Antarctic
1 January, 1990 by Paul Rodhouse
A bottom-trawl survey of the Falklands Interim Conservation Zone was carried out during July and August 1988. Samples of Loligo gahi were collected from depths of 50–400 m and analysed…1 January, 1990
Using a variety of techniques, the susceptibility of a species of Zygnerna (Chlorophyta) from the Antarctic to freezing was investigated with freshly collected and cultured material. There was no evidence…1 January, 1990
The effects of temperature and radiation flux on the partitioning of photosynthetically fixed carbon into four intracellulai metabolic pools was investigated for natural phytoplankton assemblages from an Antarctic freshwater lake.…1 January, 1990
1 Earlier work with albatrosses led to the hypothesis that a critical element influencing ovarian development each year is whether the ovary responds to rising gonadotrophin secretion by secreting progesterone…1 January, 1990
Initial results are presented from two methods whereby burst precipitation events in the lower ionosphere, almost certainly induced by VLF wave‐particle interactions in the magnetosphere, have been detected using a…Read more on Wave-induced burst precipitation events detected with a digital ionosonde
1 January, 1990 by John King
Profiles of wind speed, temperature and turbulent fluxes of heat and momentum in the lowest 32 m have been measured at a station on an antarctic ice shelf. During the…Read more on Some measurements of turbulence over an antarctic ice shelf
1 January, 1990
Voyagers 1 and 2 discovered radio emissions at Jupiter, Saturn and Uranus which were similar to those already studied in the Earth's magnetosphere. Terrestrial myriametric radiation, TMR, emanates from electrostatic…Read more on Remote sensing of planetary plasma by means of natural radio emissions
1 January, 1990 by Robert Mulvaney
The dielectric stratigraphy of a 130 m ice core from Dolleman Island, Antarctic Peninsula, shows large variations in the dielectric relaxation process and in conductivity. A comparison with the chemical…Read more on Chemical evidence in polar ice cores from dielectric profiling
1 January, 1990
The continuum theory of mixtures is used as the mathematical framework for a four-constituent model of a natural snowpack. The general conservation equations in point form are derived from appropriate…1 January, 1990
Recent mathematical models treat a natural snow-pack as a mixture body consisting of solid ice grains, liquid water, and a gas made up of air and water vapour. Such a…1 January, 1990
The first observations are presented from Halley, Antarctica, of quasi-periodic (QP)_VLF intensity variations modulated at the frequency of concurrent Pc3 magnetic pulsations. Seen on broadband frequency-time plots, the QP emissions…Read more on Quasi-periodic VLF emissions and concurrent magnetic pulsations seen at L = 4
1 January, 1990
The three-dimensional microstructure of Tolypothrix mats from the bottom of a maritime antarctic lake of Signy Island, South Orkneys, was examined. Samples from mats at two depths, 4 and 6 m,…Read more on The fine structure of an algal mat from a freshwater maritime antarctic lake
1 January, 1990
Six of the eight species of beetles at South Georgia, the southernmost beetles of the world, were investigated in outdoor arenas with pitfall traps for their diel patterns of locomotory…1 January, 1990
The physiological adaptations required to survive exposure to low temperatures must be of great importance in allowing nematodes to colonize extreme terrestrial environments, such as Antarctic fellfields. Seasonal variation in…1 January, 1990
A joint IAS/Geological Society of London meeting, organized by the British Sedimentological Research Group, was held in London at the Geological Society on 9-11 May 1989, to address the problem…Read more on Sea level changes at active plate margins: processes and products
1 January, 1990
Oxygen-isotope analysis of well-preserved macrofossils from the Santonian-Campanian of James Ross Island and the Maastrichtian of Vega Island, Antarctica, indicates that cool high-paleolatitude temperatures prevailed during the Late Cretaceous and…1 January, 1990 by Jonathan Watkins
Gut fullness of 3264 Antarctic krill in 38 swarms was estimated using fluorometric determination of chlorophyll a . There was a very wide range of gut fullness (maximum value 3277…1 January, 1990 by Roger Worland, William Block
The body water content and resistance to desiccation were studied in two perimylopid beetles, Perimylops antarcticus and Hydromedion sparsutum, a chironomid midge, Eretmoptera murphyi, and two spiders, Notiomaso australis and…1 January, 1990
Fabry-Perot interferometer measurements of the Doppler shift of the 5577Å O1S emission are used to derive neutral wind velocities at E-region altitudes over Halley, Antarctica (Λ=61°). These measurements, recorded during…Read more on Lower thermospheric wind measurements near 60° Λ from 5577Å Doppler interferometry
1 December, 1989
The number of Antarctic fur seals (Arctocephalus gazella) in the area of the Scotia Sea has been increasing. Observation of their distribution on the breeding grounds are important to help…1 December, 1989 by Jonathan Watkins
A technique for moult staging Antarctic krill (Euphausia superba Dana) was used in the analysis of field samples to predict intermoult periods and hence assess growth and the effects of…1 December, 1989
Hydrocarbons in the environment occur as complex mixtures. The detection of low-level anthropogenic contamination can be difficult as many of the compounds can also be found in biogenic materials. Results…1 December, 1989
The records obtained from a monostatic acoustic sounder run at Halley, Antarctica, have been analysed with the use of data from instruments on a 32 m mast and from radiosonde…Read more on Acoustic sounding of the atmospheric boundary layer at Halley, Antarctica
1 December, 1989
The Dobson ozone spectrometer has been used for studies of the ozone layer for about 60 years. It remains indispensable for assessing the accuracy of satellite-borne instruments. The steps which…Read more on Measurements of total ozone using Dobson spectrometers: Some comments on their history
1 December, 1989 by Lloyd Peck
Scaling patterns of shell thickness, shell volume, total animal volume, internal tissue volume and mantle cavity volume in the brachiopod Liothyrella uva (Broderip, 1833) were investigated in relation to shell…Read more on Scaling patterns in the Antarctic brachiopod Liothyrella uva (Broderip, 1833)
1 December, 1989
Chick feeding in common diving petrels (Pelecanoides urinatrix exsul) and South Georgia diving petrels (P. georgicus) was studied on Bird Island, South Georgia. Complete chick meals removed from the proventriculus…Read more on Chick feeding in the diving petrels Pelecanoides georgicus and P. urinatrix exsul
1 November, 1989
A net sampling survey was conducted around the island of South Georgia during July/August 1983. This study compares the age structure and vertical and horizontal distributions of the dominant copepods…Read more on Distribution of six major copepod species around South Georgia during an austral winter
1 November, 1989
The physical explanation of the changes of the maximum electron concentration of the F2 layer, NmF2. as a result of geomagnetic disturbances has proved elusive even after several decades of…Read more on Geomagnetic storms in the Antarctic F-region. II. Physical interpretation
1 November, 1989 by Roger Worland, William Block
The consumption of fresh plant materials by adults and larvae of Hydromedion sparsutum and Perimylops antarcticus (Col., Perimylopidae) was estimated from the production of faecal pellets and amount of excreted…1 November, 1989 by Roger Worland, William Block
Metabolic rates were studied in adults and larvae of the two phytophagous beetles Hydromedion sparsutum and Perimylops antarcticus (Col., Perimylopidae) indigenous to the Sub-Antarctic island of South Georgia. From the…1 October, 1989
The effects of low temperatures, freezing and desiccation on a cyanobacterium (Phormidium) and an alga (Prasiola) from terrestrial Antarctic habitats were investigated. Net photosynthesis per unit dry weight, measured by…1 October, 1989
Three species of calanoid copepods, Boeckella michaelseni, Parabroteas sarsii and Pseudoboeckella poppei were recorded from 6 freshwater localities in the Husvik area, South Georgia. Of the latter species two distinct…1 October, 1989
The Cretaceous of west James Ross Island, Antarctica represents the proximal fill of a late Mesozoic back‐arc basin that was probably initiated by oblique extension during the early development of…1 October, 1989 by Robert Mulvaney
A 133 m deep Antarctic ice core from Dolleman Island, Antarctic Peninsula, has been profiled by dielectric measurements in the AF‐LF (20 Hz ‐ 100 kHz) frequency range. This has…1 October, 1989
Recent GLORIA and SeaMARC II sidescan sonar surveys have imaged virtually the whole of the Easter microplate, and revealed unprecedented detail and complexity in its tectonic fabric and history. There…Read more on Comprehensive sonar imaging of the Easter microplate
1 September, 1989
The hypothesis that sunlight may induce the enzymes involved in the vitamin D pathway has been tested by comparing the ability to synthesize vitamin D3 and its 25 hydroxy metabolite…Read more on Effect of phototherapy on serum 25-hydroxyvitamin D in the Antarctic