A5065554856- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Microbial Community Ecology and Physiology
- Polar Research and Ecology
- Isotope Analysis in Ecology
- Diatoms and Algae Research
- Marine animal studies overview
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Marine and coastal plant biology
- Coral and Marine Ecosystems Studies
- Arctic and Antarctic ice dynamics
- Protist diversity and phylogeny
- Atmospheric and Environmental Gas Dynamics
- Polyamine Metabolism and Applications
- Paleontology and Stratigraphy of Fossils
- Spaceflight effects on biology
- Mass Spectrometry Techniques and Applications
- Algal biology and biofuel production
- Indoor Air Quality and Microbial Exposure
- Planetary Science and Exploration
- Bacteriophages and microbial interactions
- Methane Hydrates and Related Phenomena
University of Tasmania
2012-2024
Abstract. Ocean alkalinity enhancement (OAE) is a proposed method to counteract climate change by increasing the of surface ocean and thus chemical storage capacity seawater for atmospheric CO2. The impact OAE on marine ecosystems, including phytoplankton communities which make up base food web, largely unknown. To investigate influence communities, we enclosed natural plankton community from coastal Tasmania 22 d in nine microcosms during spring bloom. Microcosms were split into three...
Sea ice is a key habitat in the high latitude Southern Ocean and predicted to change its extent, thickness duration coming decades. The sea-ice cover instrumental mediating ocean–atmosphere exchanges provides an important substrate for organisms from microbes algae predators. Antarctic krill, Euphausia superba, reliant on sea during phases of life cycle, particularly larval stages, food refuge their predators, while other small grazers, including copepods amphipods, either live brine channel...
Light underneath Antarctic sea-ice is below detectable limits for up to 4 months of the year. The ability diatoms survive this prolonged darkness relies on their metabolic capability. This study first examine proteome a prominent diatom in response extended darkness, focusing protein-level mechanisms dark survival. Fragilariopsis cylindrus was grown under continuous light or 120 d. whole cell quantitatively analysed by nano-LC-MS/MS investigate changes that occur during sustained and...
Abstract Ice-associated microalgae make a significant seasonal contribution to primary production and biogeochemical cycling in polar regions. However, the distribution of algal cells is driven by strong physicochemical gradients which lead degree microspatial variability microbial biomass that significant, but difficult quantify. We address this methodological gap employing field-deployable hyperspectral scanning photogrammetric approach study sea-ice cores. The optical set-up facilitated...
ABSTRACT Ice algae are a key component in polar marine food webs and have an active role large-scale biogeochemical cycles. They remain extremely under-sampled due to the coarse nature of traditional point sampling methods compounded by general logistical limitations surveying regions. This study provides first assessment hyperspectral imaging as under-ice remote-sensing method capture sea-ice biomass spatial variability at ice/water interface. Ice-algal cultures were inoculated unique...
Sea ice algae contribute up to 25% of the primary productivity polar seas and seed large-scale ice-edge blooms. Fluctuations in temperature, salinity, light associated with freeze/thaw cycle can significantly impact photophysiology ice-associated taxa. The effects multiple co-stressors (i.e., freezing temperature high brine salinity or sudden exposure) on were investigated a series tank experiments diatom Fragilariopsis cylindrus under different intensities. When algal cells frozen into ice,...
Nitric oxide (NO) is widely recognized as an important transmitter molecule in biological systems, from animals to plants and microbes. However, the role of NO marine photosynthetic microbes remains unclear even less known about this metabolite Antarctic sea‐ice diatoms. Using a combination microsensors, microfluidic chambers, artificial tanks, basic mechanistic insight into NO's dynamics within diatom Fragilariopsis cylindrus was obtained. Results suggest that production F....
Microorganisms confined to annual sea ice in the Southern Ocean are exposed highly variable oxygen and carbonate chemistry dynamics because of seasonal increase biomass limited exchange with underlying water column. For sea-ice algae, physiological stress is likely be exacerbated when melts; however, variation speciation has rarely been monitored during this important state-transition. Using pulse amplitude modulated fluorometry (Imaging-PAM, Walz), we documented situ changes maximum quantum...
Abstract. Ocean alkalinity enhancement (OAE) is a proposed method to counteract climate change by increasing the of surface ocean and thus chemical storage capacity seawater for atmospheric CO2. The impact OAE on marine ecosystems, including phytoplankton communities which make up base food web, are largely unknown. To investigate influence we enclosed natural plankton community from coastal Tasmania 22 days in nine microcosms during spring bloom. Microcosms were split into three groups, (1)...
Pseudoalteromonas is a ubiquitous and abundant genus of marine bacteria commonly associated with algae. In this study, novel siphoviral-morphological bacteriophage, vB_PhoS_XC, was isolated from the coastal seawaters Qingdao (China) during bloom Ulva prolifera ( U. ) green tide. The morphology phage (icosahedron head 51 ± 1 nm in diameter; tail length 86 nm) characterized through transmission electron microscope. biological properties virus showed short latent period (45 minutes), large...
Sea ice supports a unique assemblage of microorganisms that underpin Antarctic coastal food-webs, but reduced thickness coupled with increased snow cover will modify energy flow and could lead to photodamage in ice-associated microalgae. In this study, microsensors were used examine the influence rapid shifts irradiance on extracellular oxidative free radicals produced by sea-ice algae. Bottom-ice algal communities exposed one three levels incident light for 10 days: low (0.5 μmol photons m...
Abstract Extracellular carbohydrate production is widespread in sea ice microbial communities, being produced by both algae and bacteria. Under stressful conditions, including nutrient limitation high light, cells may export excess fixed carbon as glucose. Glucose microsensors were used to measure extracellular glucose exudation consumption a algal community. increased with increasing irradiance between 15 512 µmol photons m −2 s −1 . This correlated declining F v values NPQ values, implying...
The regolith environment and associated organic material on Ceres is analogous to environments that existed Earth 3–4 billion years ago. This has implications not only for abiogenesis the theory of transpermia, but it provides context developing a framework contrast limits Earth’s biosphere with extraterrestrial interest. In this study, substrate utilisation by ice-associated bacterium Colwellia hornerae was examined respect three aliphatic hydrocarbons may be present Ceres: dodecane,...
Abstract Glucose microsensors were used to measure extracellular glucose exudation and consumption in a sea ice algal community. export increased with increasing irradiance between 15 512 µmol photons m − 2 s 1 . This correlated declining F v values NPQ values, implying that resulted from exposure above optimal irradiances. concentrations samples treated DCMU block photosynthesis, declined at all Bacterial of was 6% 34% per hour.