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DSC studies of freezing in terrestrial enchytraeids (Annelida: Oligochaeta)
1 January, 2000 by William Block
Specimens of six enchytraeid species from a wide range of terrestrial habitats were cooled to –25oC and rewarmed at 1oC min-1 and their cryobiological features measured by DSC. All were…Read more on DSC studies of freezing in terrestrial enchytraeids (Annelida: Oligochaeta)
Digestion rate, gut passage time and absorption efficiency in the Antarctic spiny plunderfish
1 January, 2000
The absolute gut evacuation rate (GER) (g day−1) of Harpagifer antarcticus increased with increasing ration mass, fish mass only influenced the absolute GER at a daily ration level of 0·3%…Skin temperatures during free-ranging swimming and diving in Antarctic fur seals
1 January, 2000
This study tests the hypothesis that an endothermic homeotherm should minimise heat flux in cold polar waters by minimising skin temperature. Temperature variability was measured at the surface of the…Read more on Skin temperatures during free-ranging swimming and diving in Antarctic fur seals
State-dependent fertility in pinnipeds: contrasting capital and income breeders
1 January, 2000
1. The study tested the hypothesis that the occurrence of pregnancy in mammals that are capital breeders will be most closely related to state variables that are indices of food…Read more on State-dependent fertility in pinnipeds: contrasting capital and income breeders
Physical oceanographic conditions to the northwest of the sub-Antarctic Island of South Georgia
1 January, 2000 by Eugene Murphy, Philip Trathan
Ocean physics is a key aspect of the operation of island ecosystems, yet the hydrodynamics is sometimes poorly understood. A high-resolution oceanographic survey to the north of South Georgia identified…Effects of sea ice cover on the swarming behaviour of Antarctic krill,Euphausia superba
1 January, 2000 by Jonathan Watkins
Much of the distribution range of Antarctic krill, Euphausia superba, is covered by permanent or seasonal sea ice. Sea ice extent has been implicated as a major factor affecting reproductive…Read more on Effects of sea ice cover on the swarming behaviour of Antarctic krill,Euphausia superba
Isolation and characterization of Campylobacter jejuni subsp. jejuni from Macaroni Penguins (Eudyptes chrysolophus) in the subantarctic region
1 January, 2000
On Bird Island, South Georgia, albatrosses (n = 140), penguins (n = 100), and fur seals (n = 206) were sampled for Campylobacter jejuni. C. jejuni subsp. jejuni was recovered…Temporal plankton dynamics in an oligotrophic maritime Antarctic lake
1 January, 2000
1 The population density, diversity and productivity of the microbial plankton in an oligotrophic maritime Antarctic lake were studied for a 15-month period between December 1994 and February 1996. 2…Read more on Temporal plankton dynamics in an oligotrophic maritime Antarctic lake
A petrified cycad trunk from the Late Cretaceous of the Larsen Basin, Antarctica
1 January, 2000
Cetricycas antarcticus gen. et sp. nov. occurs in the Late Coniacian to Campanian Lachman Crags Member of the Santa Marta Formation, Marambio Group, James Ross Island, Antarctica. The petrified trunk…Read more on A petrified cycad trunk from the Late Cretaceous of the Larsen Basin, Antarctica
A new macroflora from the South Orkney Islands, Antarctica: evidence of an Early to Middle Jurassic age for the Powell Island Conglomerate
1 January, 2000
A macroflora from John Peaks, Powell Island, contains Sagenopteris nilssoniana, Cladophlebis oblonga, Brachyphyllum sp., Elatocladus confertus, and Sphenopteris sp. The macroflora is best correlated with the Botany Bay Group flora,…A composite gazetteer of Antarctica
1 January, 2000
Publication of the Composite gazetteer of Antarctica by the SCAR Working Group on Geodesy and Geographic Information is a major milestone in the evolution of Antarctic toponymy. It has taken…Poleward‐moving HF radar flow bursts in the cusp: Transient changes in flow speed or direction?
1 January, 2000 by Gareth Chisham, Michael Pinnock
Poleward‐moving line‐of‐sight velocity “flow bursts” have been observed in the cusp by two southern hemisphere SuperDARN HF radars with overlapping fields‐of‐view. This has allowed the estimation of unambiguous two‐dimensional velocity…High-time resolution conjugate SuperDARN radar observations of the dayside convection response to changes in IMF By
1 January, 2000 by Gareth Chisham, Michael Pinnock
We present data from conjugate SuperDARN radars describing the high-latitude ionosphere's response to changes in the direction of IMF By during a period of steady IMF Bz southward and Bx…Spatial patterns of diversity in the sea: bryozoan species richness in the North Atlantic
1 January, 2000 by Andrew Clarke
1. We have examined large-scale geographical patterns in species richness for continental shelf bryozoan assemblages in the North Atlantic. Bryozoans are common and often abundant benthic organisms, but they have…The state and future of Mars polar science and exploration
1 January, 2000
As the planet's principal cold traps, the martian polar regions have accumulated extensive mantles of ice and dust that cover individual areas of ∼106 km2 and total as much as…Read more on The state and future of Mars polar science and exploration
Plasmaspheric storm time erosion
1 January, 2000 by Mark Clilverd
Unusually low whistler mode group delay times are observed by VLF Doppler receivers at both Faraday, Antarctica, and Dunedin, New Zealand, following magnetic storms. These are typically caused by plasmaspheric…The ionospheric footprint of antiparallel merging regions on the dayside magnetopause
1 January, 2000 by Michael Pinnock
The antiparallel merging hypothesis states that reconnection takes place on the dayside magnetopause where the solar and geomagnetic fields are oppositely directed. With this criterion, we have mapped the predicted…Read more on The ionospheric footprint of antiparallel merging regions on the dayside magnetopause
Managing fisheries to conserve the Antarctic marine ecosystem: practical implementation of the Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR)
1 January, 2000
We aim to identify the important steps in the evolution of the ecosystem approach to management under the Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR). The first…The terrestrial micro-arthropod fauna of the South Sandwich Islands
1 January, 2000 by Peter Convey
The South Sandwich Islands are an isolated maritime Antarctic volcanic island arc 550-600km south-east of South Georgia. The terrestrial biology of the islands, with emphasis on the unique habitats associated…Read more on The terrestrial micro-arthropod fauna of the South Sandwich Islands
The flora of the South Sandwich Islands, with particular reference to the influence of geothermal heating
1 January, 2000 by Dominic Hodgson, Helen Peat, Peter Convey
Aim To carry out as comprehensive a survey as practicable of the flora (higher plants, mosses, liverworts, lichens, basidiomycete fungi and diatoms) of the isolated, volcanically active, South Sandwich Islands…The terrestrial biota of Charcot Island, eastern Bellingshausen Sea, Antarctica: an example of extreme isolation
1 January, 2000 by Helen Peat, Peter Convey
This paper documents the previously undescribed terrestrial fauna (mites, nematodes, tardigrades) and flora (liverworts, mosses and lichens) of Marion Nunataks, Charcot Island (69°45'S 075°15'W). Species diversity in all groups is…Refining the risk of freezing mortality for Antarctic terrestrial microarthropods
1 January, 2000 by Roger Worland, Peter Convey
In studies of three common, freezing susceptible, Antarctic microarthropods, the springtail Cryptopygus antarcticus and the mites Alaskozetes antarcticus and Halozetes belgicae, we report (i) the consequences on cold tolerance of…Read more on Refining the risk of freezing mortality for Antarctic terrestrial microarthropods
Survival of freezing by free-living Antarctic soil nematodes
1 January, 2000 by Roger Worland, Peter Convey
Free-living microbivorous nematodes become numerically dominant in Antarctic terrestrial faunas as environmental conditions become more severe, while also reaching very high levels of abundance in moist, vegetated habitats. Nematodes have…Read more on Survival of freezing by free-living Antarctic soil nematodes
Evolution of taxonomic diversity gradients in the marine realm: evidence from the composition of Recent bivalve faunas
1 January, 2000 by Alistair Crame
A major new inventory of living marine Bivalvia (Mollusca) is based on 29 regional faunas. These again pick out strong latitudinal and longitudinal gradients in taxonomic diversity, but there are…Intrinsic and extrinsic controls on the diversification of the Bivalvia
1 January, 2000 by Alistair Crame
At the present day the Class Bivalvia comprises some 8000 species, sub-divided into approximately 700 genera, 107 families, and 41 superfamilies (Morton, 1996, and references therein). It represents one of…Read more on Intrinsic and extrinsic controls on the diversification of the Bivalvia
The nature and origin of taxonomic diversity gradients in marine bivalves
1 January, 2000 by Alistair Crame
Bivalves have been fundamental in developing the understanding of large-scale biodiversity patterns in the marine realm. A new study based on 29 regional bivalve faunas indicates that both latitudinal and…Read more on The nature and origin of taxonomic diversity gradients in marine bivalves
Fatty acid composition as an indicator of carnivory in Antarctic krill,Euphausia superba
1 January, 2000
In a previous study at South Georgia, carnivory was invoked as a cause of high polyunsaturated fatty acid (PUFA) content of Antarctic krill, Euphausia superba. To examine this, krill were…Energy balance and cold adaptation in the octopus Pareledone charcoti
1 January, 2000 by Lloyd Peck
A complete energy balance equation is calculated for the Antarctic octopus Pareledone charcoti at 0°C. Energy used in respiration, growth, and excretion of nitrogenous and faecal waste, was recorded along…Read more on Energy balance and cold adaptation in the octopus Pareledone charcoti
Cephalopod diet of the southern elephant seal, Mirounga leonina, at King George Island, South Shetland Islands
1 January, 2000 by Paul Rodhouse
In the summer of 1995/96, 25 southern elephant seals, Mirounga leonina, were stomach lavaged at Stranger Point, King George Island, South Shetland Islands. Cephalopod remains were present in 72% of…Molecular evidence for genetic mixing of Arctic and Antarctic subpolar populations of planktonic foraminifers
1 January, 2000
Bipolarity, the presence of a species in the high latitudes separated by a gap in distribution across the tropics, is a well-known pattern of global species distribution. But the question…A novel miniature confocal microscope/Raman spectrometer system for biomolecular analysis on future Mars missions after Antarctic trials
1 January, 2000
Biomolecules, such as the productive and protective pigments of photosynthetic organisms, are good biomarkers in extreme Antarctic deserts as analogues of early Mars. Laser Raman technology at long wavelengths which…Antarctic Peninsula Late Cretaceous-Early Cenozoic palaeoenvironments and Gondwana palaeogeographies
1 January, 2000
A review is made of stratigraphical, geochemical and palaeogeographical data from the northern Antarctic Peninsula and the Southern Ocean for Late Mesozoic-Early Cenozoic times. Clay mineral and S/total organic C…The non-marine invertebrate fauna of Deception Island (Maritime Antarctic): a baseline for a comprehensive biodiversity database
1 January, 2000 by Peter Convey, Sandra McInnes, Sandra McInnes
A small collection of samples from terrestrial and fresh-water habitats on Deception Island in the Maritime Antarctic South Shetland archipelago yielded 14 invertebrate taxa, including four species, which are new…Profiling cryopreservation protocols for Ribes ciliatum using differential scanning calorimetry
1 January, 2000 by Roger Worland, William Block
DSC analysis was performed at three points in the cryopreservation process on encapsulated-dehydrated meristems of Ribes ciliatum. Meristems were excised from shoots pre-treated with either sucrose or glucose, encapsulated in…Vibrational Raman spectroscopic study of scytonemin, the UV-protective cyanobacterial pigment
1 January, 2000
The Raman spectrum of the photoprotective pigmentscytonemin found in cyanobacterial sheaths has been obtained for the first time. Its skeletal structure is extensively conjugated and unique in nature. Detailed molecular…Inter-annual variation in the gonad cycle of the mackerel icefish
1 January, 2000
Spawning by Antarctic fish is generally considered to be seasonal and restricted to a brief period during the autumn and winter. Arising from this it has been assumed that the…Read more on Inter-annual variation in the gonad cycle of the mackerel icefish
Cretaceous (Late Albian) coniferales of Alexander Island, Antarctica. 1: Wood taxonomy: a quantitative approach
1 January, 2000
Silicified conifer woods are very common in the mid-Cretaceous (LateAlbian, 100 Ma) Triton Point Member of the Neptune Glacier Formation (Fossil Bluff Group), SE AlexanderIsland, Antarctica. These occur as up…A method to distinguish between woods produced by evergreen and deciduous coniferopsids on the basis of growth ring anatomy: a new palaeoecological tool
1 January, 2000
A method is outlined in which woods produced by deciduous and evergreen coniferopsids may be distinguished from one another on the basis of a quantitative analysis of growth ring anatomy.…The relationship between leaf longevity and growth ring markedness in modern conifer woods and its implications for palaeoclimatic studies
1 January, 2000
Growth rings in modern conifer woods were quantitatively analysed to investigate the relationship between leaflongevity and the markedness of the growth ring boundary. Five conifer species exhibiting a wide range…Lipids, trophic relationships, and biodiversity in Arctic and Antarctic krill
1 January, 2000 by Andrew Clarke
Environmental seasonality is a critical factor in structuring polar marine ecosystems. The extensive data now available on the lipids of Arctic and Antarctic euphausiids show that all species are characterised…Read more on Lipids, trophic relationships, and biodiversity in Arctic and Antarctic krill
Fish do not avoid survey vessels
1 January, 2000
The precarious condition of the world's fisheries is making ever-greater demands of the scientific assessment of fish stocks. Traditional assessments that rely on commercial catch statistics can have major shortcomings1…Relics of a complex triple junction in the Weddell Sea embayment, Antarctica
1 January, 2000
Interpretation of an airborne magnetic data compilation containing a key, new survey, together with re-tracked satellite gravity data from the WeddellSeaembayment (WSE), West Antarctica, suggests Rift–Rift–Rift triplejunction formation at the…Read more on Relics of a complex triple junction in the Weddell Sea embayment, Antarctica
Facies analysis and sequence stratigraphy of CRP-2/2A, Victoria Land basin, Antarctica
1 January, 2000
The Oligocene to Quaternary succession encountered in CRP-2/2A is divided into twelve recurrent lithofacies (some of which have been subdivided further), reflecting a range of marine, glacimarine and possibly subglacial…Read more on Facies analysis and sequence stratigraphy of CRP-2/2A, Victoria Land basin, Antarctica
Possible causes of stratospheric NO2 trends observed at Lauder, New Zealand
1 January, 2000 by Howard Roscoe
A recently published analysis of slant columns of NO2 observed at twilight at 45°S has identified trends of about 5%/decade between 1980 and 1998. This is twice the trend in…Read more on Possible causes of stratospheric NO2 trends observed at Lauder, New Zealand
Effect of magnetopause leakage on the lifetime of magnetospheric cavity modes
1 January, 2000 by Mervyn Freeman
Magnetospheric cavity modes can decay through various loss processes. Energy leakage across the magnetopause is one such process that is commonly neglected. Here we consider what the actual effect of…Read more on Effect of magnetopause leakage on the lifetime of magnetospheric cavity modes
Evidence for a solar wind origin of the power law burst lifetime distribution of the AE indices
1 January, 2000 by Mervyn Freeman
In this paper we examine the claim that the power law distribution of burst lifetimes in the AE index is evidence that the magnetosphere is a Self‐Organized Critical (SOC) system.…Power law distributions of burst duration and interburst interval in the solar wind: Turbulence or dissipative self-organized criticality?
1 January, 2000 by Mervyn Freeman
We calculate the probability density functions P of burst energy e, duration T, and interburst interval τ for a known turbulent system in nature. Bursts in the Earth-Sun component of…Variations between winter and summer in the toxicity of copper to a population of the mysid Praunus flexuosus
1 January, 2000 by Lloyd Peck
Copper toxicity was tested on a coastal population of the mysid Praunus flexuosus (Müller) from Southampton Water (Southern England) under winter and summer conditions. Ten-day toxicity tests were performed on…Foraging partitioning between giant petrels Macronectes spp. and its relationship with breeding population changes at Bird Island, South Georgia
1 January, 2000 by Andrew Wood
We satellite-tracked the foraging trips of males and females of the 2 sibling species of giant petrels, Macronectes halli and M. giganteus, breeding sympatrically at Bird Island (South Georgia, Antarctica),…Sexual dimorphism and sexual segregation in foraging strategies of northern giant petrels, Macronectes halli, during incubation
1 January, 2000 by Andrew Wood
Giant petrels (Macronectes spp.) are the most sexually dimorphic of all seabirds. We used satellite-tracking and mass change during incubation to investigate the influence of sexual size dimorphism, in terms…Field comparison of an LHPR net sampling system and an Optical Plankton Counter (OPC) in the Southern Ocean
1 January, 2000 by Eugene Murphy, Peter Ward
A field comparison of an optical plankton counter (OPC) and a Longhurst-Hardy Plankton Recorder (LHPR) was undertaken around the sub-Antarctic island of South Georgia during austral spring, 1997, to investigate…Foraging ranges, diets and feeding locations of gannets Morus bassanus in the North Sea:evidence from satellite telemetry
1 January, 2000 by Andrew Wood, Richard Phillips
We used satellite telemetry to examine the foraging ranges, feeding locations and travel speeds of 17 chick-rearing gannets Morus bassanus from the Bass Rock, SE Scotland. Regurgitates indicated that birds…A search for ENSO teleconnections in the west Antarctic Peninsula climate in austral winter
1 January, 2000
Evidence is sought for El Niño–Southern Oscillation (ENSO) teleconnections in the South Pacific extratropical atmospheric circulation and in seasonal temperatures in the west Antarctic Peninsula (WAP) during austral winter. Emphasis…Sprite observations in the Northern Territory of Australia
1 January, 2000
Sprites, a form of brief luminous discharge in the upper atmosphere above a thunderstorm, were observed and imaged on two video cameras in Australia's Northern Territory. These were the first…Read more on Sprite observations in the Northern Territory of Australia
Do some like it hot? Temperature as a possible determinant of variability in the growth of the Patagonian squid, Loligo gahi (Cephalopoda: Loliginidae)
1 January, 2000
Loligo gahi were collected from bottom trawl samples taken around the Falkland Islands on both commercial and research vessels from January 1994 to November 1995. Commercial samples were taken from…Continental rift to back-arc basin: Jurassic-Cretaceous stratigraphical and structural evolution of the Larsen Basin, Antarctic Peninsula
1 January, 2000
The Larsen Basin developed in Jurassic times as a result of continental rifting during the early stages of Gondwana break‐up. Lower‐?Upper Jurassic non‐marine sedimentary and volcanic rocks constitute a syn‐rift…Temperature and the hygropreference of the Arctic Collembolan Onychiurus arcticus and mite Lauroppia translamellata
1 January, 2000 by Roger Worland, Peter Convey
The hygropreference of adult Onychiurus arcticus (Tullberg) was investigated over 2 h at 0, 10 and 20°C, along humidity gradients (12–98% RH) established using different salt solutions. At all temperatures…Chlamydophila abortus in a brown skua (Catharacta antarctica lonnbergi) from a subantarctic island
1 January, 2000
On Bird Island, South Georgia, a new strain of Chlamydophila abortus was detected in one Brown skua out of 37 specimens from six different seabird species. Phylogenetic analysis of thernpB…Sliding over anisotropic beds
1 January, 2000 by Richard Hindmarsh, Richard Hindmarsh
Many glacier beds are anisotropic, by which is meant that the dominant wavelengths are different in the two map-plane directions. A largely unexplored consequence of Nye-Kamb sliding theory is the…Use of a viscous model of till rheology to describe gravitational loading instabilities in glacial sediments
1 January, 2000 by Richard Hindmarsh, Richard Hindmarsh
This paper models the operation of loading (Rayleigh-Taylor) instabilities in sediments using an effective-pressure-dependent viscosity such has been used to model the deformation of sediment beneath glaciers. A particular feature…Artificial surface pressure trends in the NCEP–NCAR reanalysis over the Southern Ocean and Antarctica
1 January, 2000 by Gareth Marshall
An examination of 50 years of the National Centers for Environmental Prediction (NCEP)–National Center for Atmospheric Research (NCAR) reanalysis from 1949 to 1998 reveals that significant spurious trends occur in…Raman spectroscopy of pigments and oxalates in situ within epilithic lichens: Acarospora from the Antarctic and Mediterranean
1 January, 2000
Fourier Transform laser Raman spectroscopy was used to generate diagnostic spectra for pigments and biodegradative calcium oxalate in situ in two yellow-pigmented species of the lichen genus Acarospora from contrasting…Living probes into the marine environment – apex predators as oceanographic platforms
1 January, 2000
The primary obstacles to the collection of oceanographic data are the limitations of sampling i n time and in three-dimensional space. Ship-board surveys are well designed for detailed sampling at…Read more on Living probes into the marine environment – apex predators as oceanographic platforms
Electron pitch angle diffusion by electrostatic electron cyclotron harmonic waves: The origin of pancake distributions
1 January, 2000 by Richard Horne
It has been suggested that highly anisotropic electron pancake distributions are the result of pitch angle diffusion by electrostatic electron cyclotron harmonic (ECH) and whistler mode waves in the equatorial…Proton and electron heating by radially propagating fast magnetosonic waves
1 January, 2000 by Richard Horne
We investigate the propagation, growth, and decay of fast magnetosonic waves in the Earth's magnetosphere which are believed to contribute to proton heating up to energies of a few hundred…Read more on Proton and electron heating by radially propagating fast magnetosonic waves
Chick growth in albatrosses: curve fitting with a twist
1 January, 2000
We present a new type of equation to describe the growth patterns of procellariiform seabirds and other species whose chicks characteristically lose mass towards the end of the rearing period.…Read more on Chick growth in albatrosses: curve fitting with a twist
Chick provisioning rates and growth in Black-browed Albatross Diomedea melanophris and Grey-headed Albatross D. chrysostoma at Bird Island, South Georgia
1 January, 2000
We compared the parental division of labour and the pattern and rate of parental provisioning by two sympatric species of albatross of similar mass and breeding timetable but differing in…