Found 14089 items
1 January, 1980
During palaeobotanical studies in the Antarctic Peninsula in February 1979, late Cretaceous or younger fossil angiosperm leaves were found within volcaniclastic rocks widely believed to be of late Jurassic age1.…Read more on Angiosperm fossils in supposed Jurassic volcanogenic shales, Antarctica
1 January, 1980
The Voyager missions have revealed that jovian kilometric radiation (emanating from Jupiter's magnetosphere) is beamed away from the zenomagnetic equator. Results from GEOS 1 show that terrestrial non-thermal continuum or…Read more on Latitudinal beaming of planetary radio emissions
1 January, 1980
A procedure is described for the determination without preconcentration of Cd, Cu, Pb and Zn in Antarctic snow, based on differential pulse anodic stripping voltammetry at a rotating glassy carbon…1 January, 1980
Reindeer (Rangifer tarandus) living on the subantarctic island of South Georgia were found to have a high prevalence of dental abnormalities and mandibular swellings (11 to 30 per cent, and…Read more on Dental abnormalities and mandibular swellings in South Georgia reindeer
1 January, 1980
Norwegian reindeer, Rangifer tarandus, were introduced to the sub-Antarctic island of South Georgia in 1911 & 1925. Because there are few potential intermediate hosts and no other ungulates on the…Read more on Observations on the internal parasites of reindeer introduced into South Georgia
1 January, 1980
Reindeer (Rangifer tarandus) were introduced into South Georgia in 1911 and 1925, and now form 3 herds. Each herd was at a different stage of an irruptive oscillation when they…Read more on Population dynamics and mortality of reindeer introduced into South Georgia
1 January, 1980
Whistler components received by the VLF goniometer at Halley, Antarctica, have been scaled for nose frequency and direction of arrival. The data were taken from two separate one hour periods…1 January, 1980
Knee whistlers and plasmaspheric whistlers recorded by the VLF goniometer receiver at Halley, Antarctica on 24th June 1977 have been analysed. The knee whistlers were received between 1900 UT and…Read more on A whistler study of the bulge region of the plasmapause
1 January, 1980
Profile surveys are presented of four ice rises on the east coast of the Antarctic Peninsula. On Butler Island velocity measurements were also made. The ice rises behave as miniature…1 January, 1980
The method of dating rocks and minerals is known as geochronology. Although in principle this term could be applied to estimation of relative ages according to traditional geological observation, it…1 January, 1980
An annotated list is provided of all the macromycetes (Ascomycotina and Basidiomycotina) recorded from the Antarctic region and neighbouring islands. Bryosphaeria megaspora Spooner, Didymella antarctica Spooner, Epibryon chorisodontiae Spooner, Gnomonia…Read more on Higher fungi of Antarctica, the Subantarctic Zone and Falkland Islands
1 January, 1980
Twenty-one monthly collections of the Antarctic limpet Nacella (Patinigera) concinna (Strebel, 1908) were obtained by divers at Signy Island, South Orkney Islands. A mean monthly population density of 123.7 ±…1 January, 1980
1) Laboratory experiments were carried out on the photosynthetic physiology of two algal communities and two species of aquatic moss from lakes on Signy Island (Antarctica). (2) Net rate of…1 January, 1980
(1) The vegetation of three oligotrophic lakes on Signy Island (Antarctica) is dominated by benthic algal felts and aquatic mosses, and the phytoplankton is sparse. Five seasonal factors affect underwater…1 January, 1980
The diet of two small burrow dwelling petrels, Dove prion, Pachyptila desolata and Blue petrel Halobaena caerulea, was studied at the subantarctic island of South Georgia by quantitative analysis of…1 January, 1980
The food and feeding ecology of Black‐browed Albatrosses and Grey‐headed Albatrosses was studied from 1975 to 1978 at Bird Island, South Georgia. Two hundred and seventy food samples (averaging 75–85…1 January, 1980
Brown rats were introduced to the sub‐antarctic island of South Georgia probably around 1800. They are now widespread and abundant, particularly on the north coast. The population is divided into…Read more on Feral brown rats, Rattus norvegicus, in South Georgia (South Atlantic Ocean)
1 January, 1980
Electrical d.c. resistivity measurements made on the George VI Ice Shelf have established the polar nature of Antarctic ice despite saturation by melt-water from surface melt-lakes. Previously it has been…Read more on Recrystallisation and electrical behaviour of glacier ice
1 January, 1980
In the previous paper (Strangeways, 1980) it was shown that the systematic error in the azimuthal bearing due to multipath propagation and incident wave polarisation (when this also constitutes an…Read more on Systematic errors in VLF direction-finding of whistler ducts—II
1 January, 1980
It is shown that, when the whistler-mode phase refractive index is plotted along the length of geomagnetic field lines as a function of altitude, there is a minimum at an…Read more on Trapping of whistler-waves through the side of ducts
1 January, 1980
We have conducted experiments measuring ELF and VLF radio signals in the afternoon to early morning (local time) between 24 March and 4 April 1979 in Northern Scandinavia. Apart from…1 January, 1980
Surveys of glaciers require special reduction techniques because of the continuous movement of ice. In the past, a minimum of two surveys of a network was needed to determine glacier…1 January, 1980
During winter (1973), a very pure natural population of the diatom Navicula glaciei Van Heurck occurred in dense concentrations (up to 244 mg·m−2 chlorophyll a) in the sea ice at…1 January, 1980
The Signy Island terrestrial reference sites epitomize unpolluted maritime Antarctic tundra. The extreme transition from the harsh Antarctic winter to the milder summer facilitates studies of the effects of freeze-thaw…Read more on Seasonal fluctuations in microbial activity in Antarctic moss peat
1 January, 1980 by William Block
The cold tolerance mechanism of the Antarctic terrestrial mite Alaskozetes antarcticus (Michael) was investigated in cultured animals. Freezing is fatal in this species and winter survival occurs by means of…Read more on Experimental studies on the cold tolerance of Alaskozetes antarcticus
1 January, 1980 by William Block
1. Determinations of live weight-specific oxygen consumption (metabolic rate) in adults of the Antarctic terrestrial mite Alaskozetes antarcticus (Michael) showed that starvation resulted in metabolic suppression. 2. Food materials were…Read more on Some factors affecting metabolic rate in an Antarctic mite
1 January, 1980
The temperate cryptostigmatid mite Humerobates rostrolamellatus Grandjean tolerates temperatures below -20°C by supercooling. Glycerol is present in these animals after acclimation at 0°C. The significance of these findings is briefly…Read more on Cold hardiness in a temperate cryptostigmatid mite
1 January, 1980 by William Block
Nanorchestes antarcticus Strandtmann 1967 (Prostigmata: Pachygnathidae) is reported in ice samples from the MacLeod Glacier оп Signy Island in the maritime Antarctic. Its оссuпепсе in glacier ice is discussed in…Read more on Nanorchestes antarcticus Strandtmann (Prostigmata) from Antarctic ice
1 January, 1979
Mice living in tussock grass on a remote headland of the South Atlantic island of South Georgia (54°S) where the mean temperature is less than 2°C and the monthly average…1 January, 1979 by William Block
Mean supercooling points for a variety of soil and litter arthropods including mites, springtails, a heteropteran and immature spiders from a central Alaskan taiga site ranged from ‐6.3 to ‐28.5°C…Read more on Cold tolerance of micro-arthropods from Alaskan taiga
1 January, 1979
Five main British Antarctic Survey stations were occupied throughout the year. These were Faraday and Halley (the two geophysical observatories), Signy (the main biological station), Grytviken (a multi-disciplinary sub-Antarctic station…1 January, 1979 by Andrew Clarke
When fed shrimp every 2 days, the isopod Glyptonotus antarcticus Eights assimilated over 90% of the ingested food. Errors in this estimate due to loss of food material during maceration…Read more on Assimilation efficiency of the antarctic marine isopod Glyptonotus antarcticus
1 January, 1979 by Andrew Clarke
Samples of pink shrimp, Pandalus montagui (Leach), were taken in winter from the estuary of the River Crouch and Lynn Well in the Wash. Males and ovigerous females (analysed without…1 January, 1979 by Andrew Clarke
Comparison of the life-histories of two species pairs of caridean decapods, each pair containing a polar and a more temperate-water species (Chorismus antarcticus (Pfeffer, 1887)/Pandalus montagui Leach, 1814 and Notocrangon…Read more on On living in cold water: K-strategies in antarctic benthos