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1. Correlational studies of reproductive success are plagued by difficulty over the direction of … causation. For example, improved reproductive success with age can result from increased … experience or reproductive effort, or selection against low-quality phenotypes that survive poorly.
1. Subordinate helpers in cooperative societies may gain both immediate and future benefits, including paternity and territorial inheritance. However, if such opportunities correlate with rank … in the queue, it is unclear why such queues should be stable. 2.
Abundance and grazing impacts of krill, salps and herbivorous copepods were investigated in … Antarctic waters along the 1408E meridian, south of Australia, during the summers of 2002 and 2003. North of the Southern Boundary of the Antarctic Circumpolar Current (SB-ACC)…
The eVect of diVerent light regimes on the … development of sexual maturity and body composition … (carbon, nitrogen, lipid and protein) of Antarctic krill, Euphausia … superba, was studied over 12 weeks under laboratory … conditions.
[1] In September–October 2005, the juxtaposition of low- and high-pressure anomalies at … 130W and 60W, respectively, created strong and persistent northerly airflow across the … West Antarctic Peninsula (WAP). This had a major impact on regional sea ice conditions…
This paper presents the average sidereal anisotropy (SA) of sub-TeV galactic cosmic ray intensity observed with a two-hemisphere network (THN) of underground muon detectors over 15 years. The average SA confirms the conclusions derived from the initial 5-year data by THN [1][2]…
Abstract We examined the incidence of extreme … diving in a 3-year overwintering study of emperor … penguins Aptenodytes forsteri in East Antarctica. We … defined extreme dives as very deep (> 400 m) and/or … very long (> 12 min).
Chlorophyll fluorescence was used to measure changes in the maximum fluorescence yield (F0m) and effective quantum yield (F/F0m ) of Antarctic macroalgae in response to dissolved copper.
Sea-ice drift and deformation in the Western Weddell Sea during austra; summer of 2004 are characterised using in situ data from a meso-scale array of 24 drifting ice buoys. About 30 days of data during late November and December 2004 are available from the buoy array.
Although satellite passive-microwave remote sensing is the main source of global sea-ice … information, the data products have never been adequately validated for East Antarctic … conditions.
This paper outlines work at La Trobe University on the development of a “fully digital” radar for space weather … investigations. The new radar will enhance the existing Tasman International Geospace Environment Radar … (TIGER) that probes beyond the horizon…
Sea-ice brine algal communities were exposed … to salinities between 30 and 10& during melting. There … was a progressive decline in maximum quantum yield, relative electron transfer rate (rETRmax) and photosynthetic … efficiency (a) with decreasing salinity of the final … melted sample.
Abstract The diet of pinnipeds is most commonly … inferred from morphologically diagnostic remains of prey … in their scats. Although this method can generate quantitative … estimates of diet simply, important prey types may not … always be detected.
Abstract. A pilot study assessment of the potential exposure to solar ultraviolet radiation (UVR) of expeditioners on the Australian Antarctic resupply voyages was carried out over the summer of 2004/05 using UVR sensitive polysulphone (PS) badges.
Sea ice observations are difficult to obtain in sufficient temporal and spatial resolution. Several observational techniques have been used to build a sea ice record of ice … concentration, ice extent, and ice thickness among other things. Satellite measurements are … varied in their capabilities…
A study of the variation in snow cover and depth over the Antarctic sea ice zone was … performed using AMSR-E/Aqua snow depth and sea ice temperature products of … approximate 5-day intervals from June 2002 through December 2005. Time series statistic … analyses of mean and maximum snow depth…
Ship-based observations of sea ice conditions have been collated from 89 voyages to the … Antarctic pack ice, between 1980 and 2005. These data were collected primarily by … Russian, Australia, US…
An historical data set, collected in 1958 by Southward and Crisp, was used as a baseline for detecting … change in the abundances of species in the rocky intertidal of Ireland. In 2003, the abundances of each of … 27 species was assessed using the same methodologies (ACFOR…
As a result of selective pressures faced during lactation, vocal recognition may … play a crucial role in maintaining the phocid mother–pup bond during the period … of dependence. To investigate this possibility, we examined whether Weddell seal … (Leptonychotes weddellii)…
This paper presents the meteor temperatures estimated using two radars installed … in Davis (69 deg S, 78 deg E), Antarctica. The Davis MST radar was installed in … February 2003, primarily for observation of polar mesosphere summer echoes…
The impact of ambient ultraviolet (UV)-B radiation on the endemic bryophyte, Grimmia … antarctici, was studied over 14 months in East Antarctica. Over recent decades, Antarctic … plants have been exposed to the largest relative increase in UV-B exposure as a result of … ozone depletion.
Climate change is expected to affect the high latitudes first and most severely, rendering … Antarctica one of the most significant baseline environments for the study of global … climate change. The indirect effects of climate warming…
There are continuing efforts to refine our understanding of the association … between Polar Mesospheric Clouds (PMCs) and Polar Mesosphere Summer Echoes … (PMSEs).
This study examines the molecular-genetic divergence and evolution of Australian aquatic micro-Crustacea Daphnia … and Daphniopsis. The results indicate that species of Daphniopsis are accommodated within the genus Daphnia. Although their phyletic integrity is no longer supported…