A5036141382- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Algal biology and biofuel production
- Protist diversity and phylogeny
- Ocean Acidification Effects and Responses
- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Genomics and Phylogenetic Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Historical and Cultural Archaeology Studies
- Environmental DNA in Biodiversity Studies
- Coral and Marine Ecosystems Studies
- Bacteriophages and microbial interactions
- Methane Hydrates and Related Phenomena
- Water Quality Monitoring and Analysis
- Marine and coastal plant biology
- Photosynthetic Processes and Mechanisms
- Wastewater Treatment and Nitrogen Removal
- demographic modeling and climate adaptation
- Archaeology and Natural History
- Ruminant Nutrition and Digestive Physiology
- Aquaculture Nutrition and Growth
- Fish Ecology and Management Studies
Marine Conservation Institute
2014-2025
Duke University
2016-2025
Manchester Metropolitan University
2025
University of South Carolina Beaufort
2016-2024
Schrodinger (United States)
2024
Cornell University
2022
Luxel (United States)
2022
Stanford University
2022
University of Hawaii at Hilo
2022
New York State College of Agriculture & Life Sciences
2022
Prochlorococcus is the numerically dominant phytoplankter in oligotrophic oceans, accounting for up to half of photosynthetic biomass and production some regions. Here, we describe how abundance six known ecotypes, which have small subunit ribosomal RNA sequences that differ by less than 3%, changed along local basin-wide environmental gradients Atlantic Ocean. Temperature was significantly correlated with shifts ecotype abundance, laboratory experiments confirmed different temperature...
The availability of iron is known to exert a controlling influence on biological productivity in surface waters over large areas the ocean and may have been an important factor variation concentration atmospheric carbon dioxide glacial cycles. effect Southern Ocean particularly because its area abundant nitrate, yet iron-enhanced growth phytoplankton be differentially expressed between with high silicic acid south low north, where diatom limited by both iron. Two mesoscale experiments,...
Comparative genomics gives us a new window into phage-host interactions and their evolutionary implications. Here we report the presence of genes central to oxygenic photosynthesis in genomes three phages from two viral families (Myoviridae Podoviridae) that infect marine cyanobacterium Prochlorococcus. The encode photosystem II core reaction center protein D1 (psbA), high-light-inducible (HLIP) (hli) are present all genomes. Both myoviruses contain additional hli gene types, one them...
The phytoplankton community in the oligotrophic open ocean is numerically dominated by cyanobacterium Prochlorococcus, accounting for approximately half of all photosynthesis. In illuminated euphotic zone where Prochlorococcus grows, reactive oxygen species are continuously generated via photochemical reactions with dissolved organic matter. However, genomes lack catalase and additional protective mechanisms common other aerobes, this genus highly susceptible to oxidative damage from...
Axenic (pure) cultures of marine unicellular cyanobacteria the Prochlorococcus genus grow efficiently only if inoculation concentration is large; colonies form on semisolid medium at low efficiencies. In this work, we describe a novel method for growing agar that improves level recovery to approximately 100%. grows robustly cell concentrations, in liquid or solid medium, when cocultured with heterotrophic bacteria. Once surpasses critical threshold, "helper" heterotrophs can be eliminated...
In a focused analysis of Prochlorococcus population structure in the western North Atlantic, we found that relative abundances ecotypes varied significantly with depth and, at seasonally stratified locations, degree vertical mixing. More limited regional variation was observed (e.g., Sargasso Sea, Gulf Stream, continental slope, and equatorial current), local patchiness minimal. Modeling combined South Atlantic data set revealed significant, independent effects light temperature on ecotype...
The marine cyanobacterium Prochlorococcus MED4 has the smallest genome and cell size of all known photosynthetic organisms. Like phototrophs at temperate latitudes, it experiences predictable daily variation in available light energy which leads to temporal regulation partitioning key cellular processes. To better understand tempo choreography this minimal phototroph, we studied entire transcriptome over a simulated light-dark cycle, placed context diagnostic physiological cycle parameters....
ABSTRACT Marine microbial communities are complex and dynamic, their ecology impacts biogeochemical cycles in pelagic ecosystems. Yet, little is known about the relative activities of different populations within genetically diverse communities. We used rRNA as a proxy for activity to quantify specific (rRNA/ribosomal DNA [rDNA or genes]) eubacterial identify locations clades which there uncouplings between abundance. After analyzing 1.6 million sequences from 16S rDNA (cDNA) libraries two...
Significance The cyanobacterium Prochlorococcus is the most abundant photosynthetic organism in oceans, driving marine food webs and biogeochemistry. Estimates of cell mortality production are critical to determine how organic matter transferred into web. Using novel high-resolution sampling methods on two winter-time cruises, we show that daily cells surface waters subtropical Pacific gyre consistently balanced by their nightly consumption other organisms. These synchronized loss processes...
Abstract Transitions in community genomic features and biogeochemical processes were examined surface subsurface chlorophyll maximum (SCM) microbial communities across a trophic gradient from mesotrophic waters near San Diego, California to the oligotrophic Pacific. Transect end points contrasted thermocline depth, rates of nitrogen CO2 uptake, new production SCM light intensity. Relative waters, bacterial displayed greater genetic diversity enrichment putative sulfur oxidizers, multiple...
Abstract Foraging theory predicts the evolution of feeding behaviors that increase consumer fitness. Sponges were among earliest metazoans on earth and developed a unique filter‐feeding mechanism does not rely nervous system. Once thought indiscriminate, sponges are now known to selectively consume picoplankton, but it is unclear whether this confers any benefit. Additionally, dissolved organic carbon (DOC) detritus, relative preferences for these resources unknown. We quantified suspension...
ABSTRACT The cyanobacterium Prochlorococcus numerically dominates the photosynthetic community in tropical and subtropical regions of world's oceans. Six evolutionary lineages have been described, their distinctive physiologies genomes indicate that these are “ecotypes” should different oceanic distributions. Two methods recently developed to quantify ecotypes field, probe hybridization quantitative PCR (QPCR), shown this is indeed case. To facilitate a global investigation ecotypes, we...
Abstract Bioenergy carbon capture and storage (BECCS) has been proposed to reduce atmospheric CO 2 concentrations, but concerns remain about competition for arable land freshwater. The synergistic integration of algae production, which does not require or freshwater, with BECCS (called “ABECCS”) can emissions without competing agriculture. This study presents a technoeconomic life‐cycle assessment colocating 121‐ha facility 2,680‐ha eucalyptus forest BECCS. biomass fuels combined heat power...
Recent studies have focused on linking marine microbial communities with environmental factors, yet, relatively little is known about the drivers of community patterns across complex gradients from nearshore to open ocean. Here, we examine dynamics in 15 five-station transects beginning at estuarine Piver's Island Coastal Observatory (PICO) time-series site and continuing 87 km continental shelf oligotrophic waters Sargasso Sea. 16S rRNA gene libraries reveal strong clustering by sampling...
Subsurface chlorophyll maximum layers (SCMLs) are nearly ubiquitous in stratified water columns and exist at horizontal scales ranging from the submesoscale to extent of oligotrophic gyres. These heightened and/or phytoplankton concentrations generally thought be a consequence balance between light energy above limiting nutrient flux below, typically nitrate (NO 3 ). Here we present multiple lines evidence demonstrating that iron (Fe) limits or with colimits communities SCMLs along primary...