Showing 13487 items
1 January, 1982
The diet of the Light-mantled Sooty Albatross Phoebetria palpebrata breeding at South Georgia is described on the basis of quantitative analysis of thirtyseven food samples from chicks and nine from…Read more on The food and feeding ecology of the light-mantled sooty albatross at South Georgia
1 January, 1982
Ammonite-bearing Jurassic and Cretaceous sedimentary successions are well developed in the Antarctic Peninsula and the Magallanes Basin of Patagonia. Faunas of middle Jurassic-late Cretaceous age are present in Antarctica but…Read more on A comparison of the ammonite faunas of the Antarctic Peninsula and Magallanes Basin
1 January, 1982
Cheus annae, new genus, new species, is described and figured. Comparisons with the Phoxocephalidae, Urothoidae, Platyischnopidae, Haustoriidae, and Pontoporeiidae show many characters in common, particularly with the first three families.…1 January, 1982
Equipment suitable for measuring temperature, solar radiation, humidity, and wind speed is reviewed together with problems encountered during field use in cold climates. The importance of matching the type of…1 January, 1982
South Georgia, at present governed as a Dependency of the Falkland Islands, has an interesting history of human activity extending back nearly two centuries. The sealers who visited the island…1 January, 1982
Marine planktonic primary production was studied in Borge Bay, Signy Island, the Antarctic, during the period January 1972–February 1974. Productivity was measured in situ by the radiocarbon uptake method. In…Read more on Primary production of phytoplankton off Signy Island, South Orkneys, the Antarctic
1 January, 1982
Seasonal variations in temperature and moisture in moss peat were monitored in the field at Signy Island, Antarctica. When simulated in intact peat cores in vitro after frozen storage, these…Read more on Simulation of seasonal changes in microbial activity of maritime antarctic peat
1 January, 1981
Populations of Serolis polita Pfeffer and S. cornuta Studer were studied over a continuous period of 2 yr at Signy Island, South Orkney Islands. Moult classes were recognized by a…1 January, 1981 by William Block
(1) Two superficially similar chalk grasslands in the Breckland of East Anglia provided very different habitats for the abundant terrestrial isopod Armadillidium vulgare (Latreille). At Lakenheath Warren the site was…Read more on Population ecology of a terrestrial isopod in two breckland grass heaths
1 January, 1981
Peripheral blood and haemopoietic tissues of spleen and kidney of the icefish, Chaenocephalus aceratus were examined using LM and EM techniques. The peripheral blood contained cellular elements from all the…1 January, 1981
The Malvernian igneous complex of the Malvern Hills consists mainlyof plutonic rocks and their locally deformed equivalents. The igneous rocks are calc-alkaline and range from ultra mafic diorite to granite…Read more on Rb-Sr whole-rock isochron evidence for the age of the Malvern Hills complex
1 January, 1981
Bottom melting rates have been calculated for a large number of sites on George VI Ice Shelf from measurements of its kinematic behaviour. No simple explanation for the melt-rate pattern…Read more on Bottom melting under George VI Ice Shelf, Antarctica
1 January, 1981 by William Block
The main features of the cold hardiness strategies adopted by Antarctic terrestrial arthropods (principally Acari and Collembola) are reviewed. These include lethal low temperatures, chill-coma temperature, supercooling ability, cryoprotectants and…1 January, 1981 by William Block
Cold environments impose several ecological and physiological constraints upon arthropods, including reduction of metabolic rate, locomotory activity, and feeding. These result in slow growth rates and extended life cycles. Additionally,…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…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
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…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…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…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…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
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
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…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
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…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
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
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…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
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
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)…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…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
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
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…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…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…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…