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Combination of ionosonde and riometer data for absorption measurements
1 January, 1976
A method is described for combining ionosonde and riometer data which overcomes limitations in both techniques for the measurement of normal absorption in the lower ionosphere. The usefulness of these…Read more on Combination of ionosonde and riometer data for absorption measurements
Deep-water bryophytes from the highest Scottish lochs
1 January, 1976
During a preliminary limnological survey of a number of high altitude lochs in the Scottish Highlands a rich benthic bryophyte flora was noted in four of these with exceptionally clear…Read more on Deep-water bryophytes from the highest Scottish lochs
British Antarctic Survey, 1974-75
1 January, 1976
Seven British Antarctic Survey stations were operational during the year. However, in March 19755 Stonington Island was closed after 21 years of occupation. A number of senior Survey staff visited…British Antarctic Survey, 1975–76
1 January, 1976
Six British Antarctic Survey stations were operational during the year. A new station, at Rothera Point, Adelaide Island, is being built to replace Adelaide station. Its development is providing a…Ridges on Antarctic ice rises
1 January, 1976
Satellite pictures have revealed the presence of ridges on the summits of ice rises in Antarctica. Because ice does not exhibit a critical stress it is conclugerd that these ridges…Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska
1 January, 1976
The effects of variation in light intensity, temperature, and water content on rates of net photosynthesis and dark respiration have been investigated in two common tundra mosses, Polytrichum alpinum from…Read more on Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska
Solar proton and electron precipitation effects detected by ionosondes
1 January, 1976
Anomalous polar absorption events detected by means of ionosondes at four stations in the northern hemisphere and four in the southern hemisphere have been compared with energetic particle events observed…Read more on Solar proton and electron precipitation effects detected by ionosondes
The simultaneous occurrence of spread-F at magnetically conjugate points
1 January, 1976
The correlation in occurrence of spread-F observed at two magnetically conjugate mid-latitude observatories is shown to be very significant, whereas for non-conjugate stations similar correlations are negligible.Read more on The simultaneous occurrence of spread-F at magnetically conjugate points
An Upper Mesozoic island-arc–back-arc system in the southern Andes and South Georgia
1 January, 1976
The Upper Jurassic–Lower Cretaceous strato-tectonic belts of the southern Andes and South Georgia, 2000 km apart, can be correlated and explained as the products of an island-arc–back-arc system. From the…Read more on An Upper Mesozoic island-arc–back-arc system in the southern Andes and South Georgia
Dry matter production in Acaena (Rosaceae) on a subantarctic island
1 January, 1976
The growth of the rhizomatous perennial Acaena magellanica was studied in a variety of communities on South Georgia (54-55⚬ S, 36-38⚬ W). Maximum leaf area per shoot and leaf number…Read more on Dry matter production in Acaena (Rosaceae) on a subantarctic island
Some limitations on plant growth and development in tundra regions – an investigation using phytometers
1 January, 1976
The use of oats as phytometers for seasonal studies of microclimatic favourability and nutrient limitations is reported. The effect of age and development on growth parameters in long‐term experiments is…Heat and cold stress in the Antarctic
1 January, 1976
It has long been supposed that repeated exposure of a man to cold conditions might be expected to produce changes within him which would better enable him to stand up…Isolation and identification of photosynthetic bacteria (Rhodospirillaceae) from Antarctic marine and freshwater sediments
1 January, 1976
Sediment samples obtained from three freshwater lakes and off‐shore coastal marine waters on Signy Island, South Orkney Islands, Antarctica have been inoculated into selective enrichment media for purple non‐sulphur bacteria…Respiration Studies on the Antarctic Collembolan Cryptopygus antarcticus
1 January, 1975 by William Block
Analyses are presented of 190 measurements of individual respiration rate for the complete size range of Cryptopygus antarcticus Willem. A Cartesian Diver micro-respirometer was used at Signy Island (Maritime Antarctic)…Read more on Respiration Studies on the Antarctic Collembolan Cryptopygus antarcticus
Diurnal and seasonal variation in oral glucose tolerance: Studies in the Antarctic
1 January, 1975
Oral glucose tolerance tests were performed in 12 young men in the Antarctic. Tests were done in the morning and afternoon at three monthly intervals (March, June, September, December). The…Read more on Diurnal and seasonal variation in oral glucose tolerance: Studies in the Antarctic
The plasma insulin and growth hormone response to oral glucose: Diurnal and seasonal observations in the antarctic
1 January, 1975
Plasma insulin and growth hormone levels were measured during morning and afternoon oral glucose tolerance tests performed on 12 young men at three monthly intervals in the Antarctic. No diurnal…First direct evidence of life under Antarctic shelf ice
1 January, 1975
A topic of current interest to Antarctic marine biologists is the possibility of a biome at considerable distances from the open sea under the vast, permanent ice shelves that fringe…Read more on First direct evidence of life under Antarctic shelf ice
Is the vegetation of continental Antarctica predominantly aquatic?
1 January, 1975
We have suggested1 that Antarctic lakes offer a more favourable physical environment to certain species of moss than the surrounding land. We now present evidence in support of the wider…Read more on Is the vegetation of continental Antarctica predominantly aquatic?
Organochlorine residues in Antarctic snow
1 January, 1975
DDT is a useful model compound for studying the circulation of a toxic pollutant in the global environment1,2. An understanding of this process could in future be related to potentially…The study of global atmospheric pollution in Antarctica
1 January, 1975
Waste products from man's activities, released into the environment, distribute themselves between the atmosphere, the land, the sea and, through these, to the biota. There is a constant interchange of…Read more on The study of global atmospheric pollution in Antarctica
Evidence for pre-Jurassic subduction in western Antarctica
1 January, 1975
The South Shetland Islands (from King George Island to Livingston Island) are situated on a small crustal plate bounded by incipient back-arc spreading along the axis of Bransfield Strait to…Read more on Evidence for pre-Jurassic subduction in western Antarctica
Methods of determining whistler nose-frequency and minimum group delay
1 January, 1975
The optimization of the method whereby the key whistler parameters, nose-frequency (fn) and minimum group delay (tn) are determined is important for the efficient reduction of whistler recordings to yield…Read more on Methods of determining whistler nose-frequency and minimum group delay
A growth analysis technique for assessing habitat severity in tundra regions
1 January, 1975
The results are reported of growth experiments carried out over three seasons on the sub-Antarctic island of South Georgia. The values obtained for relative growth rate, net assimilation rate and…Read more on A growth analysis technique for assessing habitat severity in tundra regions
Liquid brine in ice shelves
1 January, 1975
Holes drilled into thin areas of the Brunt Ice Shelf encounter a layer of liquid brine less than 1 m thick approximately at sea-level. Assuming the brine to be moving…First marine Triassic fauna from the Antarctic Peninsula
1 January, 1975
The fauna reported here was obtained from the Legoupil Formation in the north-western part of the Antarctic Peninsula (Fig. 1), which has been assigned a Cretaceous age on the basis…Read more on First marine Triassic fauna from the Antarctic Peninsula
The pattern of growth and translocation of photosynthate in a tundra moss, Polytrichum alpinum
1 January, 1974
Green aboveground shoots of the moss Polytrichum alpinum Hedw., growing on the tundra at Point Barrow, Alaska, were exposed to 14CO2 in the field. Autoradiography and subsequent counting revealed preferential…