A5034146720- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Marine and fisheries research
- Protist diversity and phylogeny
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Genomics and Phylogenetic Studies
- Polar Research and Ecology
- Coral and Marine Ecosystems Studies
- Diatoms and Algae Research
- Marine and coastal plant biology
- Ocean Acidification Effects and Responses
- Marine Bivalve and Aquaculture Studies
- bioluminescence and chemiluminescence research
- Genetic diversity and population structure
- Marine Ecology and Invasive Species
- Soil Carbon and Nitrogen Dynamics
- Plant Taxonomy and Phylogenetics
- Geomagnetism and Paleomagnetism Studies
- Marine animal studies overview
- Mine drainage and remediation techniques
University of Hawaiʻi at Mānoa
2015-2024
University of Hawaii System
1989-2024
University of California, Santa Barbara
2004-2007
Scripps Institution of Oceanography
2007
University of South Carolina
2007
BAE Systems (United States)
2007
Woods Hole Oceanographic Institution
2004
Moss Landing Marine Laboratories
2004
Monterey Bay Aquarium Research Institute
2004
Duke University
2004
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,...
Mesoscale eddies may play a critical role in ocean biogeochemistry by increasing nutrient supply, primary production, and efficiency of the biological pump, that is, ratio carbon export to production otherwise nutrient-deficient waters. We examined diatom bloom within cold-core cyclonic eddy off Hawai`i. Eddy community biomass, size composition were markedly enhanced but had little effect on ratio. Instead, system functioned as selective silica pump. Strong trophic coupling inefficient...
Abstract The Southern Ocean contributes substantially to the global biological carbon pump (BCP). Salps in Ocean, particular Salpa thompsoni , are important grazers that produce large, fast-sinking fecal pellets. Here, we quantify salp bloom impacts on microbial dynamics and BCP, by contrasting locations differing presence/absence. Salp blooms coincide with phytoplankton dominated diatoms or prymnesiophytes, depending water mass characteristics. Their grazing is comparable microzooplankton...
Processes influencing phytoplankton bloom development in the southern Drake Passage were studied using shipboard iron‐enrichment incubations conducted across a surface chlorophyll gradient near Antarctic Peninsula, region of water mass mixing. Iron incubation assays showed that Circumpolar Current (ACC) waters severely iron limited, while shelf with high ambient concentrations (1–2 nmol L −1 ) replete, demonstrating mixing two masses is plausible mechanism for generation biomass observed...
Spatial variability of plankton biomass, community composition and size structure was investigated across a strong frontal transition (A-Front) in the southern California Current Ecosystem October 2008. Depth profiles were taken 25-km transect nine stations sampled semi-synoptically during one night for 3 days following drifter arrays adjacent water masses. Community compositions are compared based on analyses by digital epifluorescence microscopy, flow cytometry pigment high-pressure liquid...
Abstract We investigated competition between Salpa thompsoni and protistan grazers during Lagrangian experiments near the Subtropical Front in southwest Pacific sector of Southern Ocean. Over a month, salp community shifted from dominance by large (> 100 mm) oozooids small (< 20 blastozooids to (~ 60 blastozooids. Phytoplankton biomass was consistently dominated nano‐ microphytoplankton 2 μ m cells). Using bead‐calibrated flow‐cytometry light scatter estimate phytoplankton size, we...
Abstract Mixotrophic nanoflagellates can account for more than half of the bacterivory in sunlit ocean, yet very little is known about their ecophysiology. Here, we characterize grazing ecology an open‐ocean mixotroph genus Florenciella (class Dictyochophyceae). Members this class were indirectly implicated as major consumers Prochlorococcus and Synechococcus oligotrophic North Pacific Subtropical Gyre, but phagotrophic capabilities have never been investigated. Our studies showed that...
Abstract Western Atlantic bluefin tuna (ABT) undertake long-distance migrations from rich feeding grounds in the North to spawn oligotrophic waters of Gulf Mexico (GoM). Stock recruitment is strongly affected by interannual variability physical features associated with ABT larvae, but nutrient sources and food-web structure preferred habitat, edges anticyclonic loop eddies, are unknown. Here, we describe goals, context, design major findings an end-to-end process study conducted during peak...
Abstract The 2014–2015 warm anomaly (aka “the Blob”), the largest of periodic and intensifying marine heat wave (MHW) perturbations in northeast Pacific, may provide some insight about future warmer ocean. Here, we use mixed‐layer carbon estimates for total phytoplankton, major size classes functional groups from 45 CalCOFI cruises to: (1) compare MHW impacts southern California Current System to baseline 2004 2013 (2) test a space‐for‐time exchange hypothesis that links biomass structure...