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Water mass volumes in the Southern Ocean are evaluated in a section between … Antarctica and Tasmania for the period 1991–1996. Antarctic Bottom Water … consisted of Weddell Sea Bottom Water and water formed along the Ade´ lie … Coast.
Mosses are the dominant plant species in continental Antarctica, where they sparsely colonize the limited stony … coastal areas not permanently covered with snow and ice. The few species of mosses present in Antarctica live ‘‘on the … edge’’ for plant life…
This paper summarizes the results of krill demographic studies from the Commission for the Conservation of … Antarctic Marine Living Resources 2000 Survey—a large-scale krill survey across the Scotia Sea conducted in January/ … February 2000.
Vessels from Japan, Peru, and the USA conducted four sequential surveys designed to estimate the biomass density … and demography of Antarctic krill in the vicinity of the South Shetland Islands between late December 1999 and early … March 2000.
Resolving the spatial variability in the population structure of Antarctic krill (Euphausia superba) requires a synoptic … sample, as in the design of the CCAMLR 2000 Survey. However, this approach is not appropriate for assessing … temporal variability.
In the mid 1920’s, Sir Alister Hardy developed a radical new method for sampling plankton continuously, rather than taking spot samples using conventional plankton nets. The CPR was first used in Antarctic waters during the 1925-27 Discovery expedition…
Abstract. The discovery of an abundance of microorganisms that flourish in a diverse range of environments, from the frigid waters of the Antarctic, to the superheated waters of the hydrothermal vents, at the bottom of 11-km … deep ocean trenches and in salt-saturated lakes…
An episode of anomalous enhance ozone concentration in the mid-stratosphere above … Davis, Antarctica (68.6S, 78.0E) during October 2005 has been linked to a filament of … tropical ozone-rich air that was forced to high latitudes by a disturbance to the … circulation of the polar vortex.
Growth trends of Antarctic krill with sex, length, season, and region as independent variables … were modelled with a linear mixed model (LMM) using … 10 yr of accumulated instantaneous growth rate (IGR) measurements. A model of inter-moult period (IMP) as … a function of temperature…
ABSTRACT: Foraging movements of Adélie penguins are constrained both by environmental conditions … (e.g. sea ice cover) and life history factors (e.g. regular offspring provisioning). We describe … within season changes in foraging range…
The dynamics of animal populations are determined by several key demographic parameters, which vary over time with resultant changes in the status of the population. When managing … declining populations, the identification of the parameters that drive such change are a high priority…
A superposed epoch analysis of variations of the vertical electric field measured at Vostok (78.51S, 1071E; magnetic … latitude 83.61S) during 1998–2002 heliocentric current sheet (HCS)…
The calving activity of the Antarctic ice shelves is one of the major indicators of global climate change. Whereas massive calving events are well observed post factum from satellites, ice rifting and ice shelf breaks of smaller volumes are not monitored and statistically analysed.
The focus of this study was the distribution of … adult female Weddell seals during winter at the Vestfold … Hills. Satellite tracking of Weddell seals had never been … done before at this location. Hence, this was a pilot … study to evaluate the following methods.
We present water column profiles of excess particulate Ba (Baxs, an estimate of biogenic Ba from total particulate Ba … after small corrections for lithogenic Ba) along a transect in the Australian sector of the Southern Ocean from the … Subantarctic Zone (SAZ) to the Sea Ice Zone during spring…
Spatio-temporal variability of zooplankton community structure off east Antarctica (90 to 160°E) was studied from 1988 to 1996 based on samples collected by the Japanese icebreaker Shirase. Three community groups with distinctive species compositions were obtained by cluster analysis.
The abundance of small faecal pellets is high in marine waters. Little is known, however, about the processes governing their production and fate in the water column. We investigated faecal pellet production and flux in relation to the phytoplankton and copepod assemblages present in Ellis Fjord…
The period May 10-12, 1999 saw the solar wind density drop to very low levels, accompanied by a large expansion of the magnetosphere. A minimum density below one particle per cm3 was attained for several hours before the solar wind pressure returned to normal levels.
This paper describes the diet and foraging behaviour of Adélie penguins (Pygoscelis adeliae) at Béchervaise Island during 1998-99, a season of low breeding success. Fifty six percent of nests with eggs failed during the three weeks following first hatch. A breeding success of 0.
Polar organisms have adapted their seasonal cycles to the dynamic interface between ice and water. This interface ranges from the micrometre-sized brine channels within sea ice to the planetary-scale advance and retreat of sea ice.
Abstract: Data on the response behaviour of seals (crabeater, leopard and Ross) and penguins (Ad¨¦lie and … emperor) to helicopter surveys over the pack ice off East Antarctica are presented.
An inductive-limit model has been used to determine … footprint sizes for a variety of common airborne … electromagnetic-survey geometries. The model accounts … both for variations in the height and orientation of … the electromagnetic transmitter…