A5024045111- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- Methane Hydrates and Related Phenomena
- Solar and Space Plasma Dynamics
- Plant and animal studies
- Coral and Marine Ecosystems Studies
- Microbial Community Ecology and Physiology
- Marine and coastal plant biology
- Plant Pathogens and Fungal Diseases
- Plant and Fungal Species Descriptions
- Mycorrhizal Fungi and Plant Interactions
- Marine Biology and Ecology Research
- Soil Carbon and Nitrogen Dynamics
- Genomics and Phylogenetic Studies
- Protist diversity and phylogeny
- Marine Sponges and Natural Products
- Coastal wetland ecosystem dynamics
- Ecology and Vegetation Dynamics Studies
- Marine and coastal ecosystems
- Fern and Epiphyte Biology
- Diatoms and Algae Research
- Legume Nitrogen Fixing Symbiosis
- Seismic Waves and Analysis
- Clay minerals and soil interactions
Environmental Molecular Sciences Laboratory
2023-2024
The University of Western Australia
2009-2023
Lawrence Livermore National Laboratory
2012-2015
University of British Columbia
2010
Okanagan University College
2010
Recurrent mass bleaching events are pushing coral reefs worldwide to the brink of ecological collapse. While symptoms and consequences this breakdown coral-algal symbiosis have been extensively characterized, our understanding underlying causes remains incomplete. Here, we investigated nutrient fluxes physiological as well molecular responses widespread Stylophora pistillata heat stress prior onset identify processes involved in symbiosis. We show that altered cycling during is a primary...
Abstract The skeleton of reef-building coral harbors diverse microbial communities that could compensate for metabolic deficiencies caused by the loss algal endosymbionts, i.e., bleaching. However, it is unknown to what extent endolith taxonomic diversity and functional potential might contribute thermal resilience. Here we exposed Goniastrea edwardsi Porites lutea, two common corals from central Red Sea a 17-day long heat stress. Using hyperspectral imaging, marker gene/metagenomic...
Symbiotic cnidarians such as corals and anemones form highly productive biodiverse coral reef ecosystems in nutrient-poor ocean environments, a phenomenon known Darwin's paradox. Resolving this paradox requires elucidating the molecular bases of efficient nutrient distribution recycling cnidarian-dinoflagellate symbiosis. Using sea anemone Aiptasia, we show that during symbiosis, increased availability glucose presence algae jointly induce coordinated up-regulation relocalization ammonium...
Phytoplankton-bacteria interactions drive the surface ocean sulfur cycle and local climatic processes through production exchange of a key compound: dimethylsulfoniopropionate (DMSP). Despite their large-scale implications, these remain unquantified at cellular-scale. Here we use secondary-ion mass spectrometry to provide first visualization DMSP sub-cellular levels, tracking fate stable isotope (34S) from its incorporation by microalgae as inorganic sulfate biosynthesis exudation DMSP,...
The formation of water-stable aggregates in finely textured and polymineral magnetite Fe ore tailings is one the critical processes eco-engineering into soil-like substrates as a new way to rehabilitate tailings. Organic matter (OM) amendment plant colonization are considered be effective enhancing aggregation, but underlying mechanisms have not yet been elucidated. present study aimed characterize detailed changes physicochemistry, Fe-bearing mineralogy, organo-mineral interactions subject...
Abstract Background Sponges are increasingly recognised as key ecosystem engineers in many aquatic habitats. They play an important role nutrient cycling due to their unrivalled capacity for processing both dissolved and particulate organic matter (DOM POM) the exceptional metabolic repertoire of diverse abundant microbial communities. Functional studies determining host microbiome uptake exchange, however, limited. Therefore, we coupled pulse-chase isotopic tracer techniques with nanoscale...
Bacteria are key contributors to microalgae resource acquisition, competitive performance, and functional diversity, but their potential metabolic interactions with coral microalgal endosymbionts (Symbiodiniaceae) have been largely overlooked. Here, we show that altering the bacterial composition of two widespread Symbiodiniaceae species, during free-living stage, results in a significant shift cellular metabolism. Indeed, abundance monosaccharides phytohormone indole-3-acetic acid (IAA)...
Abstract Orogenic Au deposits have contributed the majority of recovered globally throughout history. However, mechanism that concentrates to extremely high bonanza grades in small domains within these remains enigmatic. The volume fluid required provide extreme endowments localized occurrences is not reflected field observations (e.g., extent quartz veining or hydrothermal alteration). Detailed optical, scanning and transmission electron microscopy, nanoscale secondary ion mass...
Abstract Efficient nutrient cycling in the coral-algal symbiosis requires constant but limited nitrogen availability. Coral-associated diazotrophs, i.e., prokaryotes capable of fixing dinitrogen, may thus support productivity a stable could contribute to its breakdown when overstimulated. However, effects environmental conditions on diazotroph communities and their interaction with other members coral holobiont remain poorly understood. Here we assessed heat stress diversity contribution...
*Rhizanthella gardneri is a rare and fully subterranean orchid that presumably obligately mycoheterotrophic. R. thought to be linked via common mycorrhizal fungus co-occurring autotrophic shrubs, but there no experimental evidence support this supposition. *We used compartmentalized microcosms investigate the tripartite relationship. (13)CO(2) was applied foliage of Melaleuca scalena plants [(13)C-(15)N]glycine fed fungus, both sources traced plants. *In our microcosm trial, up 5% carbon (C)...
Mycorrhiza formation represents a significant carbon (C) acquisition alternative for orchid species, particularly those that remain achlorophyllous through all life stages. As it is known mycorrhizas facilitate nutrient transfer (most notably of C), has not been resolved if C occurs only after lysis mycorrhizal structures (fungal pelotons) or also across the interface pre-lysed pelotons. We used high-resolution secondary ion mass spectrometry (nanoSIMS) and labelling with enriched (13) CO2...
Ecological engineering of soil formation in tailings is an emerging technology toward sustainable rehabilitation iron (Fe) ore landscapes worldwide, which requires the well-organized and stable aggregates finely textured tailings. Here, we demonstrate approach using microbial rhizosphere processes to progressively drive aggregate development Fe The were initially formed through agglomeration mineral particles by organic cements derived from decomposition exogenous matter. stability was...
Bromine and peroxidasin (an extracellular peroxidase) are essential for generating sulfilimine cross-links between a methionine hydroxylysine within collagen IV, basement membrane protein. The increase the structural integrity of membranes. formation depends on ability to use bromide hydrogen peroxide substrates produce hypobromous acid (HOBr). Once cross-link is created, released into space becomes available reutilization. Whether HOBr generated by used very selectively creating or whether...
Parasites are widespread and diverse in oceanic plankton many of them infect single-celled algae for survival. How these parasites develop scavenge energy within the host how cellular organization metabolism is altered remain open questions. Combining quantitative structural chemical imaging with time-resolved transcriptomics, we unveil dramatic morphological metabolic changes marine parasite Amoebophrya (Syndiniales) during intracellular infection, particularly following engulfment...