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When resources are limited or patchy, a species may develop some degree of resource … partitioning to reduce intra-specific competition. Development of intra-specific resource partitioning … is more pronounced in species with clear phenotypic variation among individuals (e.g. age or sex).
Serum 25(OH)D levels decline without sunlight … exposure. We studied 120 expeditioners to Antarctica to … determine the skeletal and hormonal responses to sunlight … deprivation. With emerging vitamin D insufficiency, serum … calcium decreased, PTH increased…
Ozone hole over Antarctica exists almost three decades each austral spring.
The zonal anomalies data in total ozone and thermal tropopause height … shows that ozone depletion during austral spring has a strong influence on … the height and sharpness of the tropopause over West Antarctica.
Commercial sealers exterminated the original … fur seal population at Macquarie Island in the early 1800s. The Wrst breeding record since the sealing era was not … reported until March 1955. Three species of fur seal now … occur at Macquarie Island, the Antarctic (Arctocephalus … gazella)…
In our recent study on the population genetic structure of … short-beaked common dolphins Delphinus delphis in southern … Australia (Bilgmann et al., 2008) we unequivocally … showed a high level of genetic differentiation between the … local common dolphin population in South Australia (SA)…
The mantis shrimps (Stomatopoda) are quintessential marine predators. The combination of powerful raptorial appendages … and remarkably developed sensory systems place the stomatopods among the most effi cient invertebrate predators.
Diet, and in particular, food quality and quantity … can inXuence the reproductive performance of marine … predators. Also, the diet of specialist predators is often … monitored in programmes that model and manage ecosystems. We examined the diet of Adélie penguins (Pygoscelis … adeliae)…
Whale sharks (Rhincodon typus) are thought to aggregate in nearshore waters around Christmas Island … (105◦37E, 10◦29S) to consume the marine larvae of the endemic red land crab (Gecarcoidea natalis). However, there … have been no direct observations of sharks feeding on crab larvae.
The Network for the Detection of Mesopause Change (NDMC) is a global program with the mission to promote … international cooperation among research groups investigating the mesopause region (80-100 km) with the goal of … early identification of changing climate signals.
Accurate measurement of fundamental parameters, such as temperature, density and composition, through the whole atmosphere and over long time scales is vitally important to identify and quantify changes in the earths climate, whether natural or anthropogenic.
The distribution of euphausiid larvae along the coast of Terre Ade´lie, Antarctica, was assessed using … oblique tows of a double-framed bongo net at 38 stations during summer 2004. Larvae of Euphausia … crystallorophias and Thysanoessa macrura were observed. For E. crystallorophias larvae…
We study two intense Forbush decreases that occurred during two adjacent SOLTIP (Solar connection of Transient Interplanetary … Processes) intervals; namely SOLTIP 1 (22–27 March 1991) and SOLTIP 2 (1–17 June 1991)…
We have developed a method for determining interplanetary coronal mass ejection … (ICME) geometry from galactic cosmic ray data recorded by the ground-based muon … detector network. The cosmic ray density depression inside the ICME, which is associated … with a Forbush decrease…
This work contributes to the understanding of variation in methanesulphonic (MSA) concentration in an ice core … drilled during the 1996-97 Antarctic Campaign at the coastal plateau site of Talos Dome (East Antarctica)…
The temporal evolution of the subauroral polarization stream (SAPS) is investigated … using the Doppler velocity observations by the Unwin HF radar in conjunction with … the simultaneously observed auroral luminosity and plasma convection reversal regions. The event under study of 14 December 2004…
The Harang reversal is a prominent feature frequently observed in the electric and … magnetic field patterns in the high-latitude auroral zone and plays an important role … in substorm dynamics. A comprehensive set of instruments, including Super Dual Auroral … Radar Network (SuperDARN)…
The dual Tasman International Geospace Environment … Radar (TIGER) HF radars regularly observe E-region … echoes at sub-auroral magnetic latitudes 58–60 S including … during geomagnetic storms. We present a statistical analysis … of E-region backscatter observed in a period of 2 years …
The spatio-temporal variability in the upwelling of iron-rich Upper Circumpolar Deep Water (UCDW) is thought to have a significant impact on primary production in the Southern Ocean, since iron has been shown to be a limiting nutrient in an otherwise high nutrient region.
Firn core methanesulphonic acid (MSA) stratigraphy from Talos Dome (East … Antarctica) was compared with anomalies of the satellite-measured sea ice … extent (1973–1995) in the Ross Sea and Wilkes Land oceanic sector. In spite … of the sparseness of sea ice data…