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Numerical simulations and laboratory experiments confirm my initial research hypothesis stating that dense water cascading down a submarine canyon induces localised upwelling of deeper water onto the shelf. This process, not described before…
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…
Blood protein analysis including total serum protein and albumin by chemical methods, fibrinogen estimation and serum protein electrophoresis (SPE) was performed on the leopard seal, Hydrurga leptonyx. The most commonly observed SPE pattern was eight fractions designated albumin, a1a, a1b, a2a, a2b…
Human activities in the Antarctic have resulted in … hydrocarbon contamination of these fragile polar soils. Bioremediation is one of the options for remediation of these sites. However…
Minimum approach distance guidelines are common tools to maintain a buffer between breeding seabirds and human activity, with the goal of mitigating potentially harmful impacts from these interactions.
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.
An overview of the Davis station hydroxyl airglow temperature program will be given. Seasonal structure, planetary scale periodicities and inter-year variability determined from six years of hydroxyl airglow rotational temperatures will be presented. Solar cycle influences will be examined.
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…
Current research utilises the recently installed Southern Hemisphere Imaging Riometer (SHIRE) located at Australia’s Davis Antarctic station to study riometer signatures associated with cusp-latitude magnetic impulse events (MIE’s) detected in co-located fluxgate magnetometer data.
The so-called ionosonde drift technique of determining ionospheric velocities from angle-of-arrival and Doppler shift measurements is now well established. In the standard digital ionosonde technique, commonly called the drift mode…
Enhancements in the amplitude of returns from a Medium Frequency (MF)radar at Davis, Antarctica have been identified and their potential use as a measure of PMSE has been explored. A method for finding these enhancements has been applied to data spanning the period from mid-1995 to the end of 1997.
The Weimer and IZMEM statistical convection models are driven with a time series of interplanetary magnetic field (IMF) measurements made onboard the Wind spacecraft. The model outputs are used to infer convection velocity at Casey, Antarctica (80.8°S geomagnetic latitude)…
Antarctic coastal krill (Euphausia crystallorophias) were collected in Austral winter (July/August) 1999 in the Mertz … Glacier polynya off the coast of East Antarctica and were compared to krill collected off East Antarctica during … summer in 1996 and 2001 and spring 1999.
The Diego Ramirez Islands lie 60 nautical miles … southwest of Cape Horn and are the breeding site for … three species of burrowing seabirds: blue petrels … (Halobaena caerulea), common diving petrels (Pelecanoides … urinatrix) and sooty shearwater (Puffinus griseus).
This study describes the distribution of Weddell seals Leptonychotes weddelli in winter(May-September 1999) at the Vestfold Hills, in Prydz Bay, East Antarctica. Specifically, we describe the spatial extent of haul-out sites in shore - fast sea-ice, commonly referred to as fast-ice.
Graphical methods for the exploration of ecological databases … Ben Raymond, Lee Belbin, Jonathan Stark … Scientific data repositories are becoming increasingly characterised by large data sets stored in web-accessible, structured databases.
Three species of burrowing seabirds nest on the Diego Ramirez Islands (60 nautical miles south-west of Cape Horn): blue petrels (Halobaena caerulea), common diving petrels (Pelecanoides urinatrix) and sooty shearwater (Puffinus griseus).
Bycatch of seabirds during longline fishing operations is listed under Australian legislation as a key threatening process which could endanger 14 species of seabirds. In 1998 a Threat Abatement Plan (TAP) was finalised to manage this threat.
Abstract … Scats were collected from itinerant male Hooker's sea lions, Phocarctos hookeri, at Macquarie Island and the un-eroded faunal remains used to assess the diet. Un-eroded sagittal otoliths were used to identify teleost fish and to calculate fish size.
Summary: I found a total of 18 cephalopod species, identified from their lower beaks, in samples collected from stomachs and nest materials of wandering albatrosses (D. exulans L.) at Macquarie Island during the 1970’s. Squid occurred in all samples, no fish remains were found.
Antarctica is considered the most remote ecosystem in the world yet recent studies have discovered high infection rates for some common poultry diseases in penguins.
Monitoring of background atmospheric CO2 concentration in recent decades has revealed interannual growth rate variations (IAV) that are linked to the El Nino Southern Oscillation (ENSO). However, the nature of this link is not well understood.