Found 14089 items
1 January, 1987 by William Block
Soil biological processes which have been studied in the north are extended and compared with those of the south polar region. Much can be learned from exploiting the biological similarities…Read more on Soil biological processes in the North – and South
1 January, 1987
1. Oxygen consumption, mitochondrial content and enzyme activities were determined in identified muscle fibre types of the ‘haemoglobin-less’ icefish Chaenocephalus aceratus Lonnberg. 2. Small bundles (2–12) of fast and slow…1 January, 1987
Second only to auroral kilometric radiation as the Earth's most prominent radio emission, magnetospheric nonthermal continuum radiation has been the subject of numerous observational and theoretical investigations. It has been…Read more on The magnetopause as a source of nonthermal continuum radiation
1 January, 1987
57 morphological characters were scored on a sample of 46 male and 55 characters on a sample of 40 female Gamasellus racovitzai, which had been collected from 10 localities in…1 January, 1987
(1) The sub-Antarctic island of South Georgia has a species-poor vascular flora that is not adapted to grazing by vertebrates. Consequently, reindeer (Rangifer tarandus L.) introduced to different areas of…1 January, 1987 by William Block
Polyacrylamide gel electrophoresis and subsequent esterase staining provide an alternative to immunological methods for investigating the diet of microarthropods which cannot be observed directly. Attack rates in field populations of…1 January, 1987 by Andrew Clarke, Lloyd Peck
The living terebratulid articulate brachiopod Liothyrella uva (Jackson 1912) was sampled from a shallow water population at Signy Island, South Orkney Islands, Antarctica. Neither shell height nor shell breadth were…1 January, 1987
In northern Palmer Land, Antarctic Peninsula, the magmatic arc has developed by the interaction of compressional and extensional tectonics. Periods of magmatism and arc compression in the Early Jurassic and…Read more on Structural evolution of the magmatic arc in northern Palmer Land, Antarctic Peninsula
1 January, 1987
Seventy‐two new Rb‐Sr whole‐rock analyses are reported for Haag Nunataks, Mount Woollard, the Whitmore Mountains, the Pirrit and Nash hills, and Pagano Nunatak. For Haag Nunataks, three isochrons for gneisses…1 January, 1987
A synthetic aperture radar (SAR) technique has been used to image part of the grounding-line region of Bach Ice Shelf in the Antarctic Peninsula. The radar was sledge-mounted and operated…Read more on Imaging subglacial topography by a synthetic aperture radar technique
1 January, 1987 by Keith Nicholls
A model pulsed wavefield is presented that enables the behaviour of the associated wave dislocations to be computed exactly. It consists of three intersecting beams of plane-wave pulses. Because the…Read more on Three-beam model for studying dislocations in wave pulses
1 January, 1987
We report a distribution—free approach to the detection of density—dependence in the variation of population abundance, measured by a series of annual censuses. The method uses the correlation coefficient between…Read more on The detection of density-dependence from a series of annual censuses
1 January, 1987
This paper discusses the present understanding of ionospheric storms, in particular storm effects in the F-layer and their relationship to changes of thermospheric composition. After summarizing the main effects of…1 January, 1987
Over the past 50 years, ideas relating to the physical features and dynamics of ice sheets have evolved materially, primarily due to modern technological advances in the acquisition of basic…Read more on Fifty years of progress in understanding ice sheets
1 January, 1987
Average north polar currents for the winter season have been derived from geomagnetic hourly means at six levels of geomagnetic activity. The twin-vortex pattern, normally associated with more disturbed conditions,…Read more on The effect of geomagnetic activity on north polar currents in winter
1 January, 1987
The poleward edge of the main ionospheric trough can often be regarded as the ionospheric signature of the equatorward boundary of the plasma sheet. We use Advanced Ionospheric Sounder observations…Read more on Is the poleward edge of the trough a sensitive indicator of geospace interactions?
1 January, 1987 by Paul Rodhouse
Cephalopod beaks from the stomach contents of “wandering albatross” (Diomedea exulans L.) chicks from Bird Island, South Georgia, were sampled between May and September in 1983 and 1984. Lower beaks…Read more on Cephalopod prey of the wandering albatross Diomedea exulans
1 January, 1987
Optical methods of studying the atmosphere are one valuable means of investigating atmospheric behaviour at heights ranging from less than 1 km to several hundred km. Some examples are given…Read more on Antarctica — A unique laboratory for atmospheric studies by optical methods
1 January, 1987
Declination, or the difference between true and magnetic north, is one of the earliest parameters to have been measured systematically over the earth's surface. Values are available for South Georgia…Read more on Measurement of declination at South Georgia 1700–1984
1 January, 1987
A model has been constructed which grafts IRI topside profiles to field-aligned diffusive equilibrium profiles at a “reference level” near 650 km altitude. For different values of geographic latitude, longitude,…Read more on A suggested model for the IRI plasmapheric distribution
1 January, 1987
The impacts of pollution resulting from large explosive volcanic eruptions on the atmospheric heat budget and planetary albedo are not in doubt1,2. However, the effects of volcanic aerosols on the…Read more on Global surface-temperature responses to major volcanic eruptions
1 January, 1987
Sandstone detrital modes for a representative sample of the Trinity Peninsula Group in northern Graham Land are described and assessed. Whereas the volumetrically dominant quartz and feldspar were derived principally…1 January, 1987
The plasmapause and the mid-latitude ionospheric trough have been observed simultaneously from two Antarctic stations, Halley and Faraday, during five winter nights covering a range of geomagnetic disturbance conditions. The…1 January, 1987
The Ellsworth Mountains‐Thiel Mountains ridge and adjoining areas are divided into three tectonic provinces: (1) Haag Nunataks, (2) Thiel Mountains, and (3) Ellsworth‐Whitmore Mountains crustal block. Haag Nunataks are part…1 January, 1987
The relevance of the term “Gondwanian orogeny” to deformation within upper Paleozoic to Mesozoic rocks of the Antarctic Peninsula is reviewed, and the tectogenesis of deformation within this time frame…Read more on The Gondwanian orogeny within the Antarctic Peninsula: a discussion
1 January, 1987
The soluble carbohydrate and polyhydric alcohol (polyol) content of fruticose lichens, cushion mosses and early vegetative colonizers of maritime Antarctic fellfield soils were examined by gas-liquid chromatography during 18 months.…1 January, 1987
Gas liquid chromatography and a commercially available strip of 20 conventional biochemical tests were used for the rapid sorting of strains of environmental bacterial isolates into similar ecophysiological groups. This…1 January, 1987
Gabbroic stocks and/or diabasic sills crop out in the southern Heritage Range of the Ellsworth Moutains, in the Hart Hills 400 km southwest of the Ellsworth Mountains, and in the…1 January, 1987
Ellsworth‐Whitmore Mountains crustal block (EWM) is a belt of small mountain ranges, hills, and nunataks which trend northward 500 km from the Thiel Mountains of the Transantarctic range to the…1 January, 1987 by Peter Ward
The reproductive biology of the predatory calanoid copepod Euchaeta antarctica Giesbrecht was investigated in two interconnected fjord systems at South Georgia. Counts of the number of spermatophores attached to adult…