Found 14053 items
1 January, 1983
The occurrence of sporadic E (ES) under the main F region trough has been established using ionograms from a vertical incidence ionosonde at Halley Bay, Antarctica (76°S, 27°W; L =…Read more on Studies of sporadic E (Es) associated with the main ionospheric trough
1 January, 1983
Summary. A m´lange on Fredriksen Island, South Orkney Islands, is part of a Mesozoic subduction- accretion complex which formed along the western, Pacific side of Gondwana. It consists of a…1 January, 1983
One-hop whistlers were recorded simultaneously at three high latitude stations in northern Norway during February 1978 using VLF goniometer receivers. Triangulation of the azimuthal bearings of whistlers received during an…Read more on High latitude observations of whistlers using three spaced goniometer receivers
1 January, 1983
This series of papers comprises contributions to a symposium on the geography of the Falkland Islands, held at the Royal Geographical Society on 18 May 1982, with Lord Shackleton in…1 January, 1983
In view of the global effects of climatic change there is an urgent need to detect even a small mass imbalance in the polar ice sheets. The relative merits of…1 January, 1983
Aspects of the breeding biology of the Light‐mantled sooty albatross Phoebetria palpebrata were studied at South Georgia. Its breeding distribution there is summarized and an annual breeding population of c.…1 January, 1983
(1) Grids of 1500 (300 × 5) 2 × 2 cm quadrats have been recorded on three moss-turf sites: South Georgia in the Sub-Antarctic (three dominant species), and in the…Read more on Pattern in the simple moss-turf communities of the sub-Antarctic and maritime Antarctic
1 January, 1983
Identical digital ionosondes (dynasondes) at Brighton Colorado and at White Sands Missile Range, New Mexico, 864 km distant, were synchronized for bistatic sounding in multifrequency and fixed frequency recording patterns.…Read more on First bistatic oblique-incidence ionograms between digital ionosondes
1 January, 1983
The distribution of Chromobacterium on islands of the Scotia Ridge and Antarctic Peninsula was monitored during 1975–81. Three groups of strains were recognized: (1) an acid-tolerant group at South Georgia…Read more on Distribution and characteristics of Chromobacterium in the maritime and sub-antarctic
1 January, 1983
Recent research strongly suggests that harmonic radiation from electrical power distribution networks in industrialized regions (PHLR) has a significant effect on the occurrence of VLF waves and the energetic electron…1 December, 1982 by Alistair Crame
Two groups of bivalves, the inoceramids and buchiids, are particularly useful zone fossils in the Mesozoic sedimentary formations of the Antarctic Peninsula region. In the Upper Jurassic, species of the…Read more on Late Mesozoic bivalve biostratigraphy of the Antarctic Peninsula region
1 December, 1982
Garnet is widely found as a minor constituent in rocks of the Antarctic Peninsula Volcanic Group (APVG) of Trinity Peninsula. It occurs as conspicuous megacrysts, or in xenoliths within volcanic…1 July, 1982 by Alistair Crame
The majority of inoceramid bivalves occurring in Late Jurassic temperate realm assemblages can probably be assigned to the genus Retroceramus. Although there are a few transitional forms, Retroceramus can generally…1 January, 1982
The 4C DNA amounts of 23 native or alien angiosperms from South Georgia, or the maritime Antarctic, ranged from 1.4 to 80.5 pg (in 14 monocots) and from 1.3 to…Read more on DNA amounts of angiosperms from the Antarctic and South Georgia
1 January, 1982
Two calc-alkaline plutonic complexes. Bazman and Natanz, intruded through the south-eastern active and south-western ancient continental margins of Central Iran, Have been dated by the Rb-Sr whole-rock isochron method at…1 January, 1982 by William Block
1. 1. A selective review is made of the information on cold hardiness in the following taxonomic groups: Protozoa, Platyhelminthes, Rhynchocoela, Rotifera, Nematoda, Mollusca, Annelida, Tardigrada, micro-Arthropoda (Collembola & Acari)…1 January, 1982 by William Block
1. Mean supercooling points of eleven species of arthropods (three Collembola, seven Acari and one Diptera) ranged from ‐6.2 to ‐9.4°C (high group), and from ‐17.7 to ‐31.0°C (low group).…Read more on Supercooling points of insects and mites on the Antarctic Peninsula
1 January, 1982 by William Block
(1) The cold hardiness of four species was studied in respect of supercooling ability, cryoprotective substances, chill-coma temperatures and survival under anaerobiosis. The effects of low temperature acclimation and starvation…Read more on Cold hardiness of terrestrial mites at Signy Island, maritime Antarctic
1 January, 1982
Because of their coastal habits and lethargic nature, humpback whales Megaptera novaeangliae have been among the species hardest hit by the whaling industry. Between 1904 and 1973 (when humpback catching…1 January, 1982
Ionograms from South Georgia (54°S, 37°W; L = 1.9) are used to investigate the influence of magnetic and solar activity upon the occurrence of the nocturnal intermediate layer. The diurnal…1 January, 1982
Fluctuations of the fundamental and harmonic frequencies of the Schumann (earth-ionosphere cavity) resonances measured near Tromsø, Norway, on 28 March 1979 are examined on a timescale of ≲ 20 minutes.…Read more on Schumann resonance frequency variations during sudden ionospheric disturbances
1 January, 1982 by Andrew Clarke
Chorismus antarcticus (Pfeffer, 1887) is a small benthic hippolytid shrimp which breeds seasonally, producing a batch of large, lipid-rich eggs that are brooded over winter by the female, and hatch…Read more on Lipid synthesis and reproduction in the polar shrimp Chorismus antarcticus
1 January, 1982 by Andrew Clarke
References Citations Metrics Reprints & Permissions Get access Abstract The life-history tactics of many Antarctic marine invertebrates suggest that the commonly observed slow rates of growth are adaptations…Read more on Temperature and embryonic development in polar marine invertebrates
1 January, 1982 by Andrew Clarke
The effects of freezing and thawing on a cell wall-less mutant (CW15+) of Chlamydomonas reinhardii were investigated by monitoring enzyme release, cell viability, cell ultrastructure, and lipid composition. Cells suspended…1 January, 1982
Retreat of the grounding lines of West Antarctic ice streams may lead to the collapse of the West Antarctic ice sheet. Pine Island Glacier has been pinpointed as an ice…Read more on Pine Island Glacier and its drainage basin: results from radio echo-sounding
1 January, 1982
Most penguins and petrels fast during lengthy incubation shifts; all penguins fast through their moult. The resulting weight losses can be used to calculate energy costs of these activities and…Read more on Energy costs of incubation and moult in petrels and penguins
1 January, 1982
Data from ice rises on the east coast of the Antarctic Peninsula can be interpreted as showing that the ice is thinning at rates of up 0.5 m a−1. However,…Read more on State of balance of the ice sheet in the Antarctic Peninsula
1 January, 1982 by Michael Pinnock
We report here the first observations of the dynamics of both the mid-latitude and high-latitude troughs made by the Advanced Ionospheric Sounder (AIS) at Halley Station, Antarctica (76° S, 27°…1 January, 1982
Seasonal fluctuations in population numbers and activity were monitored in bottom sediments of oligotrophic Moss Lake, mesotrophic Heywood Lake and eutrophic Amos Lake on Signy Island, South Orkney Islands, during…Read more on Seasonal microbial activity in Antarctic freshwater lake sediments
1 January, 1982
A series of acoustic transects and quantitative net hauls was made in a large patch of Antarctic krill (Euphausia superba) just north of South Georgia. The krill went through a…1 January, 1982
Sedimentary rocks of late Mesozoic age exposed at Camp Hill, northern Antarctic Peninsula, are associated with calc‐alkaline volcanic rocks. They represent deposition on a fault‐controlled floodplain, with marginal alluvial fans,…Read more on Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica
1 January, 1982
Two distinct phases of island-are evolution are recognized in late Mesozoic sedimentary rocks of the northern Antarctic Peninsula. During late Jurassic (Kimmeridgian-Tithonian) times, alternating radiolaria-rich mudstones and ash-fall tuffs were…1 January, 1982
Moss peat banks, which can be up to 3 m deep, greater than 2500 m2 in area, and up to 5000 yr old, occur in the Antarctic. Radiocarbon dates show…Read more on The formation of vertical edges on Antarctic moss peat banks
1 January, 1982
Eighteen taxa of terrestrial predacious fungi (nematode-trapping species and endozoic parasites of nematodes) are reported from the maritime Antarctic (15 taxa from Signy Island, South Orkney Islands, and ten taxa…Read more on Nematophagous fungi from the maritime Antarctic