The krill problem in Antarctica
1 January, 1981
Krill fishing in the Southern Ocean has raised in acute form the question of wildlife conservation in Antarctica: what will be the effect on the ecosystem? how much krill can…Our publications
Showing: All publications
Found 14049 items
Feeding and growth in the Antarctic collembolan Cryptopygus antarcticus
1 January, 1981
Variations in the rate of moulting and of faecal pellet production by Cryptopygus antarcticus (Willem), collected from Signy Island in the maritime Antarctic, were measured over temperatures of 0° to…Read more on Feeding and growth in the Antarctic collembolan Cryptopygus antarcticus
Biomass and respiration of nematode populations in two moss communities at Signy Island, maritime Antarctic
1 January, 1981
1. The biomasses of free-living soil nematodes from a moss turf and a moss carpet, two contrasting bryophyte ecosystems in the maritime Antarctic, are analysed and compared with other tundra…Energy intakes on sledging expeditions
1 January, 1981
1. Previous measurements of energy intake on sledging journeys in Antarctica have given a mean intake of 14.2 MJ (Acheson, 1974; Campbell, 1975), markedly lower than values reported earlier (see…Energy requirements of antarctic sledge dogs
1 January, 1981
1. Eighteen male sledge dogs were weighed immediately on removal from their sheltered winter quarters at Halley Bay, Antarctica (75° 31′s, 26° 42′W) and weekly thereafter for 14 weeks. The…Aliphatic and aromatic hydrocarbons in benthic invertebrates from two sites in Antarctica
1 January, 1981 by Andrew Clarke
Samples of marine benthic invertebrates collected from two sites in the Antarctic have been analysed for both aliphatic and aromatic hydrocarbons in order to establish baseline concentrations for some classes…Subglacial morphology in northern Palmer Land, Antarctic Peninsula
1 January, 1981
Ice-thickness and surface-elevation data gathered from radio echo flights over the Antarctic Peninsula are presented as profiles for five major outlet glaciers in northern Palmer Land and as contour maps…Read more on Subglacial morphology in northern Palmer Land, Antarctic Peninsula
The occurrence of Anopaea (Bivalvia: Inoceramidae) in the Antarctic Peninsula
1 January, 1981 by Alistair Crame
The genus Anopaea represents a small but distinctive group of inoceramid bivalves that apparently remained functionally endobyssate. The somewhat unusual morphology (for an inoceramid) probably results from structural modifications tofacilitate…Read more on The occurrence of Anopaea (Bivalvia: Inoceramidae) in the Antarctic Peninsula
The geological significance of some Triassic microfossils from the South Orkney Islands, Scotia Ridge
1 January, 1981
Late Triassic Radiolaria have been recovered from a bedded chert collected early in 1977 in the South Orkney islands. This is the first reliable palaeontological evidence for the age of…Structure and function of two Antarctic terrestrial moss communities
1 January, 1981
Two bryophyte—dominated communities in the maritime Antarctic are analyzed in terms of the transfer and standing crops of organic matter within them. A moss turf dominated by Polytrichum alpestre and…Read more on Structure and function of two Antarctic terrestrial moss communities
Polarization of radio waves in ice sheets
1 January, 1981
The polarization behaviour of radio waves which have been transmitted and reflected at or near normal incidence in an ice sheet can be explained if the ice is assumed to…Tracing particle paths in the Antarctic ice sheet
1 January, 1981
A layer of moraine within the Antarctic ice sheet has been detected in the course of airborne radar ice soundings. The moraine was injected at the margin of the ice…Read more on Tracing particle paths in the Antarctic ice sheet
An ionospheric effect on the conjugate relationship of Pi2 magnetic pulsations
1 January, 1981
In an earlier paper (Green and Hamilton, J. atmos. terr. Phys.40, 1223, 1978), we reported on a preliminary analysis of six months' magnetic data from the conjugate stations St. Anthony…Read more on An ionospheric effect on the conjugate relationship of Pi2 magnetic pulsations
Late Palaeozoic-early Mesozoic fore-arc basin Sedimentary rocks at the Pacific margin in Western Antarctica
1 January, 1981
We infer that the Trinity Peninsula Group of the Antarctic Peninsula was deposited in a fore-arc basin(s) of composite type located between the Gondwanian arc massif (consisting of plutonic and…First remote sensing of the plasmapause by terrestrial myriametric radiation
1 January, 1981
The Earth's plasmapause is a source of natural radio emission in the myriametric wavelength range (λvac∼10 km) and several mechanisms have been proposed for its generation. One such theory advocates…Read more on First remote sensing of the plasmapause by terrestrial myriametric radiation
Short-term fluctuations in heavy metal concentrations in Antarctic snow
1 January, 1981
Heavy metal variations in polar ice cores may reflect changes in global airborne pollution1. Reported profiles from Antarctica1–3 and Greenland4, where sampling resolution was normally larger than a year, have…Read more on Short-term fluctuations in heavy metal concentrations in Antarctic snow
Forage selection by introduced reindeer on South Georgia, and its consequences for the flora
1 January, 1981
(1) In 1911 and 1925 reindeer, Rangifer tarandus L., were introduced to the subantarctic island of South Georgia, where there is a species-poor vascular flora and no interspecific competition. (2)…Phytoplankton ecology in an Antarctic lake
1 January, 1981
SUMMARY. The ecology of the phytoplankton of Heywood Lake, Signy Island, South Orkney Islands, Antarctica was investigated during 1969–72. The lake, which is ice‐covered for 8–10 months per year, is…Magnetospheric VLF line radiation observed at Halley, Antarctica
1 January, 1981
Spectrograms of broad-band ELF/VLF goniometer data obtained from ground based measurements made at Halley, Antarctica (L = 4.3, conjugate near St. Anthony, Newfoundland) have shown the presence of discrete line…Read more on Magnetospheric VLF line radiation observed at Halley, Antarctica
Aggression and sexual activity of male Southern elephant seals, Mirounga leonina
1 January, 1981
The agonistic and sexual activity of individual male Southern elephant seals (Mirounga leonina) was studied during the breeding season at South Georgia. Harem bulls were older and larger than non‐harem…Read more on Aggression and sexual activity of male Southern elephant seals, Mirounga leonina
Relationships between food supply and growth in albatrosses: an interspecies chick fostering experiment
1 January, 1981
The Black-browed Albatross Diomedea melanophris and Grey-headed Albatross D. chrysostoma are similar in size and weight and breed at the same time, but have substantial dietary differences. To study the…Weight loss in incubating albatrosses and its implications for their energy and food requirements
1 January, 1981
The weight loss of incubating Black-browed Albatrosses (Diomedea melanophris) and Grey-headed Albatrosses (D. chrysostoma) was measured at Bird Island, South Georgia. The rate of weight loss did not differ significantly…Lakes on George VI Ice Shelf, Antarctica
1 January, 1981
George VI Ice Shelf is about 450 km long, 20–70 km wide, and averages 250 m in thickness. It is bordered by Alexander Island to the west and by the…Comparison of growth of albatrosses
1 January, 1981
The growth of 29 Black-browed and 46 Grey-headed Albatross chicks was studied for 95 d after hatching at Bird Island, South Georgia. A family of sigmoid curves was explored to…The importance of the maximum plasma frequency of the ionosphere in controlling the occurrence of blackout
1 January, 1981
For locations normally equatorward of the auroral oval, it is established that there is a strong inverse association between the variations in the maximum plasma frequency of the ionosphere and…The nocturnal intermediate layer over South Georgia
1 January, 1981
Detailed analyses of ionograms from South Georgia (54°S, 37°W; L = 1.9) show that a nocturnal intermediate layer is frequently seen between the E- and F-regions in the height range…Read more on The nocturnal intermediate layer over South Georgia
ELF radio signals produced in the auroral ionosphere by non-linear demodulation of signals from high-power amplitude-modulated transmitters
1 January, 1981
ELF and VLF radio signals were recorded in the afternoon to early morning (local time) between 24 March and 4 April 1979, in Northern Scandinavia. Apart from signals of natural…A complete arc-trench system recognized in Gondwana sequences of the Antarctic Peninsula region
1 January, 1981
Prior to Late Triassic–Early Jurassic times, the geological history of the Antarctic Peninsula region was dominated almost entirely by Gondwana sequences that together comprised a major arc-trench system. Subduction complex,…Longitudinal variations of plasmapause radius and the propagation of VLF noise within small (ΔL ∼ 0.5) extensions of the plasmasphere
1 January, 1981
Simultaneous broadband whistler recordings made during the International Magnetospheric Study (IMS) at the two Antarctic stations Halley and Siple have been used to study longitudinal variations in the radius of…A deployment method for in situ oceanic primary production measurement
1 January, 1981
A launch, suspension and recovery technique for oceanic, in situ, 14C productivity measurements is described. Ship's time for deployment of 125 ml incubation bottles at several depths down to 100…Read more on A deployment method for in situ oceanic primary production measurement
Intercomparison of various measurements of thermal plasma densities at and near the plasmapause
1 January, 1981
Four methods of investigating the thermal plasma density near the plasmapause have been intercompared for the period 1 to 15 July 1972. These methods are whistlers, the double floating probe…VLF line radiation observed at Halley and Siple
1 January, 1981
Power Line Harmonic Radiation and associated emissions observed at Siple [1, 2] are compared with line radiation activity observed at Halley, Antarctica [3]. We discuss the evidence for a Sunday…Read more on VLF line radiation observed at Halley and Siple