A5114251898- Polar Research and Ecology
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Tardigrade Biology and Ecology
- Various Chemistry Research Topics
- Protist diversity and phylogeny
- Metal Extraction and Bioleaching
- Biocrusts and Microbial Ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Atmospheric chemistry and aerosols
- Diatoms and Algae Research
- Planetary Science and Exploration
- Genomics and Phylogenetic Studies
- Marine and fisheries research
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Minerals Flotation and Separation Techniques
- Mine drainage and remediation techniques
- Paleontology and Stratigraphy of Fossils
- Radioactive element chemistry and processing
Australian Antarctic Division
1997-2025
Department of Climate Change, Energy, the Environment and Water
2025
University of Tasmania
2008-2024
CSIRO Oceans and Atmosphere
2001-2016
Université Laval
1999-2002
Center for Northern Studies
1999-2002
Australian National University
2000
Antarctic Climate and Ecosystems Cooperative Research Centre
1999
Commonwealth Scientific and Industrial Research Organisation
1991-1994
Australian Centre for International Agricultural Research
1991
Viruses are abundant ubiquitous members of microbial communities and in the marine environment affect population structure nutrient cycling by infecting lysing primary producers. Antarctic lakes microbially dominated ecosystems supporting truncated food webs which viruses exert a major influence on loop. Here we report discovery virophage (relative recently described Sputnik virophage) that preys phycodnaviruses infect prasinophytes (phototrophic algae). By performing metaproteogenomic...
Several cold-adapted strains isolated from a variety of algal-rich Antarctic and Southern Ocean samples formed three distinct groups within the class Flavobacteria, phylogenetically distant other cultivated species. The first taxon, designated Algoriphagus ratkowskyi gen. nov., sp. was sea ice saline lake cyanobacterial mats includes non-motile, strictly aerobic, saccharolytic rod-like or serpentine that were most closely related to genus Cyclobacterium according 16S rDNA sequence analysis...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Constant for the Dioxane—Water System from 20 to 35°Frank E. Critchfield, John A. Gibson Jr., and James L. HallCite this: J. Am. Chem. Soc. 1953, 75, 8, 1991–1992Publication Date (Print):April 1, 1953Publication History Published online1 May 2002Published inissue 1 April 1953https://pubs.acs.org/doi/10.1021/ja01104a506https://doi.org/10.1021/ja01104a506research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Constant and Refractive Index from 20 to 35° Density at 25° for the System Tetrahydrofuran—Water1Frank E. Critchfield, John A. Gibson Jr., James L. HallCite this: J. Am. Chem. Soc. 1953, 75, 23, 6044–6045Publication Date (Print):December 1, 1953Publication History Published online1 May 2002Published inissue 1 December 1953https://pubs.acs.org/doi/10.1021/ja01119a509https://doi.org/10.1021/ja01119a509research-articleACS...
Significance Horizontal gene exchange across species boundaries is considered infrequent relative to vertical inheritance that maintains coherence. However, haloarchaea living in hypersaline environments take a more relaxed approach exchange. Here we demonstrate Deep Lake, Antarctica, DNA between distinct genera, not just species, with some of the being long (up 35 kb) and virtually 100% conserved. With extremely low cell division rates cold (e.g., six generations per year), remarkable...
Abstract Antarctica, Earth’s least understood and most remote continent, is threatened by human disturbances climate-related changes, underscoring the imperative for biodiversity inventories to inform conservation. Antarctic ecosystems support unique species genetic diversity, deliver essential ecosystem services contribute planetary stability. We present Antarctica’s first comprehensive classification map of ice-free lands, which host continent’s biodiversity. used latent variables in...
Thick ice cover is a feature of cold‐temperate, polar, and alpine lakes rivers throughout much the year. Our observations from Canadian across latitudinal gradient 46–80°N show that their overlying contains low concentrations dissolved organic carbon (DOC) colored matter (CDOM) relative to underlying waters. The CDOM exclusion factor (water/ice) ranged 1.4 114 was typically greater than twice for inorganic solutes. Application synchronous fluorescence analysis lake samples experimentally...
ABSTRACT The prokaryote community activity and structural characteristics within marine sediment sampled across a continental shelf area located off eastern Antarctica (66°S, 143°E; depth range, 709 to 964 m) were studied. Correlations found between microbial biomass aminopeptidase chitinase rates, which used as proxies for activity. Biomass maximal the 0- 3-cm range declined rapidly with depths below 5 cm. Most-probable-number counting using dilute carbohydrate-containing medium recovered...
Abstract Polar oceans are chemically sensitive to anthropogenic acidification due their relatively low alkalinity and correspondingly weak carbonate buffering capacity. Here, we compare unique CO 2 system observations covering complete annual cycles at an Arctic (Amundsen Gulf) Antarctic site (Prydz Bay). The experiences greater seasonal warming (10 vs 3°C) freshening (3 2), has lower (2220 2320 μmol/kg) summer pH (8.15 8.5), than the site. Despite a larger uptake of inorganic carbon by...
Research Article| April 01, 1999 Sedimentation of 13C-rich organic matter from Antarctic sea-ice algae: A potential indicator past extent John E. Gibson; Gibson 1Antarctic Cooperative Centre, University Tasmania, Hobart, Tasmania 7001, Australia Search for other works by this author on: GSW Google Scholar Tom Trull; Trull Peter D. Nichols; Nichols 2Commonwealth Scientific and Industrial Organisation, Division Marine Research, Roger Summons; Summons 3Australian Geological Survey Canberra...
A novel, extremely thermoacidophilic, obligately chemolithotrophic archaeon (strain JP7 T ) was isolated from a solfatara on Lihir Island, Papua New Guinea. Cells of this organism were non-motile, Gram-negative staining, irregular-shaped cocci, 0.5–1.5 μm in size, that grew aerobically by oxidation sulfur, Fe 2+ or mineral sulfides. anaerobically using 3+ as terminal electron acceptor and H 2 S an donor but did not oxidize hydrogen with elemental sulfur acceptor. Strain optimally at 74 °C...
Terrestrial life in Antarctica has been described as some of the simplest on planet, and mainly confined to soil microfaunal communities. Studies have suggested that lack diversity is due extreme environmental conditions thought be driven by abiotic factors. In this study we investigated microfauna composition, abundance, distribution East Antarctica, assessed correlations with geochemistry variables. We examined 109 samples from a wide range ice-free habitats, spanning 2000 km Framnes...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductometric Standardization of Solutions Common Divalent Metallic IonsJ. L. Hall, J. A. Gibson, P.R. Wilkinson, and H. O. PhillipsCite this: Anal. Chem. 1954, 26, 9, 1484–1486Publication Date (Print):September 1, 1954Publication History Published online1 May 2002Published inissue 1 September 1954https://pubs.acs.org/doi/10.1021/ac60093a023https://doi.org/10.1021/ac60093a023research-articleACS PublicationsRequest reuse permissionsArticle...
Thirty-four permanently stratified water bodies were identified in a survey of the Vestfold Hills. Of these, 21 lakes, six seasonally isolated marine basins (SIMBs), and seven with year round connection to open ocean. The varied markedly salinity (4 g l −1 235 ), temperature (−14°C 24°C), depth (5 m 110 m), area (3.6 ha 146 ha) surface level (−30 29 above sea level). stratification all was maintained by increases salinity. During winter, thermohaline convection cell present lakes SIMBs...
Antarctica is one of the harshest environments on planet because its extreme climatic conditions, with prolonged winters, freezing temperatures and lack liquid water. While almost entire continent (99.7%) covered year round by snow ice, some mountain peaks coastal areas are ice-free sustain life. Invertebrates dominate in this environment, but despite their obvious abundance, little known major player, rotifers. In study, we examine distribution diversity rotifers from across continental...