Found 14112 items
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
1 January, 1979
A NEW collection of a Cambrian fauna, occurring as erratics in a Quaternary moraine near Mount Provender (80°23′S, 29°55′W), western Shackleton Range (Fig. 1, inset) is reported here. It includes…Read more on Geological significance of a Middle Cambrian fauna from Antarctica
1 January, 1979
The need to investigate and understand the nature of changes in abundance of economically important marine living resources has been widely recognized. They may be naturally occurring fluctuations, cycles or…1 January, 1979
Measurements of aerial admittance as a function of height above a snow surface show that when the surface temperature is below freezing, the aerial performance is insensitive to slight surface…Read more on Performance of V.H.F. aerials close to a snow surface
1 January, 1979
A preliminary analysis shows that magnetic variations of periods 16 to 60 minutes at South Georgia are strongly polarized in a NNE'ly direction. The effect is observed at all seasons…Read more on Geomagnetic polarisation anomaly at South Georgia
1 January, 1979
Actomyosins have been isolated from the white skeletal muscles of fish inhabiting thermal environments with characteristically low seasonal temperature variations for example, Antarctica, arctic rivers and the equatorial oceans. Calcium…1 January, 1979
In a sample of reindeer from South Georgia, 4 males were abnormal in that 1 had bilateral cryptorchid testis, 2 each had 1 cryptorchid testis and 1 had a vestigial…1 January, 1979
A total of 111 male reindeer of various ages was shot in all months of the year to study the relationship between the seasonal changes in testicular activity and the…Read more on Age-related changes in the testicular and antler cycles of reindeer, Rangifer tarandus
1 January, 1979
The ages of South Georgia Reindeer collected from the introduced herds, and of carcasses from natural deaths were determined using patterns of tooth replacement and eruption, and annulations in the…Read more on Age determination of reindeer introduced into South Georgia
1 January, 1979
In March 1977 an unmanned ELF/VLF goniometer receiving station was deployed on the Antarctic plateau 110 km south south west of the British Antarctic Survey base at Halley. A UHF…Read more on A remote unmanned ELF/VLF goniometer receiver in Antarctica
1 January, 1979
With the overexploitation of many conventional fish stcocks, and growing interest in harvesting new kinds of food from the sea, there is increasing need for managers of fisheries to take…1 January, 1979
A cryophilic strain of the unicellular green alga Chlamydomonas, C. nivalis was found to be more resistant to the stresses both of freezing and thawing and of shrinkage and rehydration…1 January, 1979
The growth of the Antarctic fur seal Arctocephalus gazellaat South Georgia is described from 556 specimens whose age was determined. The following parameters are described: standard length, body weight, foreflipper…Read more on Growth in the Antarctic fur seal Arctocephalus gazella
1 January, 1979
The biology of two species of diving petrel (Pelecanoides georgicus and P. urinatrix exsul) was studied at Bird Island, South Georgia. Existing criteria (bill shape and morphology, wing length) for…1 January, 1979
Twenty-one monthly collections of the Antarctic prosobranch gastropod Laevilacunaria antarctica Martens 1885 were obtained by divers at Signy Island, South Orkney Islands. Animals were contagiously distributed in the depth range…1 January, 1979
THE presence of both paraffinic and polycyclic aromatic hydrocarbons (PAH) in sediments and soils from the Northern Hemisphere has been well documented1–5. Paraffinic hydrocarbons are generally assumed to be derived…Read more on Analysis of aliphatic and aromatic hydrocarbons in Antarctic marine sediment layers
1 January, 1979
The annual rate of sediment accumulation and the proportion due to resuspension in a sheltered sub-Antarctic bay has been deduced from sediment trap experiments and vertical profiles of organic matter…Read more on Sedimentation and the distribution of organic matter in a sub-Antarctic marine bay
1 January, 1979
Large numbers of the Southern Hemisphere lamprey, Geotria australis, have been found in the regurgitated food of albatrosses breeding on South Georgia. This finding suggests that this lamprey is found…1 January, 1979
Two species of moss growing in Moss Lake on Signy Island, South Orkney Islands, had unusual morphologies with large leaves and long internodes. Both Calliergon sarmentosum and Drepanocladus cf. aduncus…Read more on Morphology and adaptation of aquatic mosses in an Antarctic lake
1 January, 1979
Samples from 15 Antarctic and Subantarctic localities were measured and subjected to discriminatory analysis of shell morphology. Only two species were recognized as belonging to the genus Yoldia Möller, 1842:…1 January, 1979
Using expressions for ice-shelf creep derived by Weertman (1957) and Thomas (1973[b]) a general method is developed for calculating equilibrium thickness profiles, velocities, and strain-rates for any ice shelf. This…1 January, 1979
Vertical shear stress in ice shelves cannot be precisely zero, since the upper and lower surfaces are generally not parallel. By performing stress balance on a vertical column in an…1 January, 1979
Monthly samples (August 1974 to February 1976) and cultured material have been used to describe ovotestis maturation, spawning, and larval development of the Antarctic opisthobranch Philine gibba Strebel. Ovotestis maturation…Read more on Reproductive biology of the antarctic opisthobranch Philine gibba Strebel
1 January, 1979
A system to facilitate the analysis of wide-band VLF data from goniometer receivers has been designed and built and is now in use. Whistlers and other types of VLF phenomena…1 January, 1979
A new design of tiltmeter has been used to measure the tidal bending of the Ronne Ice Shelf, Antarctica. By this means the point at which the ice sheet leaves…Read more on Tidal flexure of ice shelves measured by tiltmeter
1 January, 1979
19 new K–Ar mineral ages of 78-201 Ma and 3 Rb–Sr whole rock isochron ages of 81 ± 10, 127±4 and 181±30 Ma are presented from units of continental crust,…1 January, 1979
Climatic warming could cause increased melting from Antarctic ice shelves. Continued weakening of the ice shelves in this way would result in the ultimate collapse of most of the West…Read more on Effect of climatic warming on the West Antarctic ice sheet
1 January, 1979
1. During the course of a nutritional survey on an Antarctic base, leucocyte ascorbic acid estimations (Denson & Bowers, 1961) were found to be significantly affected (P < 0.0001) by…Read more on Leucocyte ascorbic acid and the leucocyte count
1 January, 1979
Resection can be used to measure the velocity of a glacier even where the co-ordinates of rock stations are unknown. The method is an adaptation of conventional semi-graphic resection and…1 January, 1979
Bransfield Strait is a narrow basin separating the South Shetland Islands from the Antarctic Peninsula and is attributed to recent back-arc extension behind the South Shetland volcanic arc. The volcanic…1 January, 1979
Polar ice is now thought to be marginally birefringent at radio echo-sounding frequencies. An experiment on the polarization behaviour of 60 MHz radio echoes from the bed of both ice…Read more on Depolarization of radio waves can distinguish between floating and grounded ice sheets
1 January, 1979
Measurements of metabolic rate in the terrestrial miteAlaskozetes antarcticus showed that the ability for metabolic temperature compensation is lacking in adults of this species. Animals cultured at 0 and 10°C…Read more on Effect of temperature change on the metabolic rate of an antarctic mite
1 January, 1979
Measurements of oxygen consumption in all post-embryonic life stages of U.K. cultured Alaskozetes antarcticus (Acari: Cryptostigmata) showed that log10 respiration rate was linearly related to log10 live weight, while loge…Read more on Respiratory metabolism of Alaskozetes antarcticus
1 January, 1979
Apparently igneous zircons from the Glen Dessary syenite complex give concordant U-Pb ages averaging 456 ± 5 Ma which is taken to date crystallization. The complex was deformed and metamorphosed…1 September, 1978
During recent years there has been a steady increase in the total world fish catch (including shellfish) to a plateau, reached in the early 1970's, of around 70 million tonnes.…