A5024467682- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Protist diversity and phylogeny
- Diatoms and Algae Research
- Isotope Analysis in Ecology
- Polar Research and Ecology
- Oceanographic and Atmospheric Processes
- Environmental DNA in Biodiversity Studies
- Ocean Acidification Effects and Responses
- Molecular Biology Techniques and Applications
- Aquatic Ecosystems and Phytoplankton Dynamics
- Algal biology and biofuel production
- Photoreceptor and optogenetics research
- Photosynthetic Processes and Mechanisms
- Marine Toxins and Detection Methods
- Methane Hydrates and Related Phenomena
- Geochemistry and Elemental Analysis
- Genomics and Phylogenetic Studies
- Coral and Marine Ecosystems Studies
- Geology and Paleoclimatology Research
- Marine and fisheries research
- Environmental Monitoring and Data Management
- Underwater Vehicles and Communication Systems
- Genetic Mapping and Diversity in Plants and Animals
University of North Carolina at Chapel Hill
2016-2025
Bigelow Laboratory for Ocean Sciences
2024
GEOMAR Helmholtz Centre for Ocean Research Kiel
2024
Woods Hole Oceanographic Institution
2024
New York University Abu Dhabi
2023
University of Georgia
2018
Communities In Schools of Orange County
2017
North Carolina State University
2017
University of Washington
2008-2012
University of British Columbia
2004-2008
Current sampling of genomic sequence data from eukaryotes is relatively poor, biased, and inadequate to address important questions about their biology, evolution, ecology; this Community Page describes a resource 700 transcriptomes marine microbial help understand role in the world's oceans.
Comparison of eight iron experiments shows that maximum Chl a , the DIC removal, and overall DIC/Fe efficiency all scale inversely with depth wind mixed layer (WML) defining light environment. Moreover, lateral patch dilution, sea surface irradiance, temperature, grazing play additional roles. The Southern Ocean were most influenced by very deep WMLs. In contrast, conditions favorable during SEEDS SERIES as well IronEx‐2. two extreme experiments, EisenEx SEEDS, can be linked via bottle...
In vast expanses of the oceans, growth large phytoplankton such as diatoms is limited by iron availability. Diatoms respond almost immediately to delivery and rapidly compose majority biomass. The molecular bases underlying subsistence in iron-poor waters plankton community dynamics that follow resupply remain largely unknown. Here we use comparative metatranscriptomics identify changes gene expression associated with iron-stimulated other eukaryotic plankton. A microcosm iron-enrichment...
The small subunit 18S rRNA (18S) gene is the most commonly used marker for taxonomic identification in eukaryotes. However, protists may harbor substantial variation their copy number, which can lead to a rapid decline concordance between sequences and actual organismal abundances. Here we computational method estimate number seven species of marine eukaryotic phytoplankton found strong interspecies strain-level differences across within examined species. Our results emphasize that...
The oceans are becoming warmer and more acidic as a result of rising atmospheric pCO2. Transcriptome plasticity may facilitate marine organisms' acclimation to thermal acidification stress by tailoring gene expression mitigate the impacts these stressors. Here, we produce first transcriptome abundant, ubiquitous, resilient Caribbean reef-building coral Siderastrea siderea, investigate this corals' transcriptomic response 95 days (T = 25, 28, 32°C) CO2-induced (324, 477, 604, 2553 µatm)...
Coral bleaching events are increasing in frequency, demanding examination of the physiological and molecular responses scleractinian corals their algal symbionts (Symbiodinium sp.) to stressors associated with bleaching. Here we quantify effects long-term (95-day) thermal CO2-acidification stress on photochemical efficiency hospite Symbiodinium within coral Siderastrea siderea, along corresponding color intensity, for from two reef zones (forereef, nearshore) Mesoamerican Barrier Reef...
We investigated the changes in cell morphology and elemental composition with varying iron nutritional status four oceanic two coastal isolates of marine pennate diatom Pseudo‐nitzschia . When iron‐deficient, most exhibited slower specific growth rates (m), reduced maximum photochemical yields (WM), lower chlorophyll a (Chl ) contents than iron‐replete cultures. Iron‐deficient cells volumes, primarily as result decreased valve transapical widths, which increased aspect ratios. The increase...
In terrestrial ecosystems, transitional areas between different plant communities (ecotones) are formed by steep environmental gradients and commonly characterized high species diversity primary productivity, which in turn influences the foodweb structure of these regions. Whether comparable zones elevated productivity characterize ecotones oceans remains poorly understood. Here we describe a previously hidden hotspot phytoplankton narrow but seasonally persistent transition zone at...
Diatoms are prominent eukaryotic phytoplankton despite being limited by the micronutrient iron in vast expanses of ocean. As inputs often sporadic, diatoms have evolved mechanisms such as ability to store that enable them bloom when is resupplied and then persist low levels reinstated. Two storage been previously described: protein ferritin vacuolar storage. To investigate ecological role these among diatoms, addition removal incubations were conducted using natural communities from varying...
The goal of the EXport Processes in Ocean from RemoTe Sensing (EXPORTS) field campaign is to develop a predictive understanding export, fate, and carbon cycle impacts global ocean net primary production. To accomplish this goal, observations export flux pathways, plankton community composition, food web processes, optical, physical, biogeochemical (BGC) properties are needed over range ecosystem states. Here we introduce first EXPORTS deployment Station Papa Northeast Pacific during summer...
Since the middle of past century, Western Antarctic Peninsula has warmed rapidly with a significant loss sea ice but impacts on plankton biodiversity and carbon cycling remain an open question. Here, using 5-year dataset eukaryotic DNA metabarcoding, we assess changes in net community production this region. Our results show that sea-ice extent is dominant factor influencing composition, biodiversity, production. Species richness evenness decline increase surface temperature (SST). In...
We quantified and compared physiological parameters iron requirements of several oceanic Pseudonitzschia spp., newly isolated from the high-nitrate, low-chlorophyll waters northeast subarctic Pacific, with coastal Pseudo-nitzschia spp. centric diatom Thalassiosira oceanica at a range concentrations. In iron-replete conditions, (Fe) : carbon (C) ratios in six isolates ranged 157 µmol Fe mol C-1 to 248 C-1, no apparent differences between isolates. low all exhibited marked reductions...
Changes in iron (Fe) bioavailability influence diatom physiology and community composition, thus have a profound impact on primary productivity ecosystem dynamics. Iron limitation of growth rates has been demonstrated both oceanic coastal waters the Northeast Pacific Ocean is predicted to become more pervasive future oceans. However, it unclear how strategies utilized by phytoplankton cope with low Fe resupply differ across these ocean provinces. We investigated response communities variable...
Abstract Trace metals and B‐vitamins play critical roles in regulating marine phytoplankton growth composition. While some microorganisms are capable of producing certain B‐vitamins, others cannot synthesize them depend on an exogenous supply. Therefore, external factors influencing vitamin synthesis, such as micronutrient concentrations, alter the extent to which available auxotrophs surface waters. We examined iron, B 7 (biotin) 12 (cobalamin) dynamics diatoms through laboratory culture...
Abstract Currently, the Galapagos sea lion (GSL, Zalophus wollebaeki ) and fur seal (GFS, Arctocephalus galapagoensis are among most important endemic species for conservation in Archipelago. Both classified as “Endangered” since their populations have undergone drastic declines over last several decades. In this study we estimated abundance of both otariids, population trends based using counts conducted between 2014 2018 all rookeries, analyzed influence environmental variability on pup...
Abstract. Marine heat waves (MHWs) are a recurrent phenomenon in the northeast Pacific that impact regional ecosystems and expected to intensify future. Prior work showed these events, including 2014–2015 “warm blob”, associated with widespread surface nutrient declines subpolar Alaska Gyre (AG) North Transition Zone (NPTZ) but reduced chlorophyll concentrations NPTZ only. Here we explain contrast between two regions using global ocean biogeochemical model (MOM6-COBALT) Argo float ship-based...