Index Catalog // ScholarsArchive@OSU

The roles of MCDW and deep water iron supply in sustaining a recurrent phytoplankton bloom on central Pennell Bank (Ross Sea)

Creator:: Kustka, Adam B., Kohut, Josh T., White, Angelicque E., Milligan, Allen J., Lam, Phoebe J., Dinniman, Michael S., Mack, Stefanie, Hunter, Elias, Hiscock, Michael R., Smith, Walker O., Jr., and Measures, Chris I.
Abstract:: See pdf for abstract.
Resource Type:: Article

Summer surface waters in the Gulf of California: Prime habitat for biological N₂ fixation

Creator:: White, Angelicque E., Prahl, Fredrick G., Letelier, Ricardo M., and Popp, Brian N.
Abstract:: We report significant rates of dinitrogen (N₂) fixation in the central basins of the Gulf of California (GC) during July–August 2005. Mixing model estimates based upon δ¹⁵N values of particulate matter in the surface mixed layer indicate that N₂ fixation provides as much as 35% to 48% of the phytoplankton-based...
Resource Type:: Article

Short-term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA: A case study of summer 2012

Creator:: Wilson, Samuel T., Barone, Benedetto, Ascani, Francois, Bidigare, Robert R., Church, Matthew J., del Valle, Daniela A., Dyhrman, Sonya T., Ferrón, Sara, Fitzsimmons, Jessica N., Juranek, Laurie W., Kolber, Zbigniew S., Letelier, Ricardo M., Martínez‐García, Sandra, Nicholson, David P., Richards, Kelvin J., Rii, Yoshimi M., Rouco, Mónica, Viviani, Donn A., White, Angelicque E., Zehr, Jonathan P., and Karl, David M.
Abstract:: Time-series observations are critical to understand the structure, function, and dynamics of marine ecosystems. The Hawaii Ocean Time-series program has maintained near-monthly sampling at Station ALOHA (22°45′N, 158°00′W) in the oligotrophic North Pacific Subtropical Gyre (NPSG) since 1988 and has identified ecosystem variability over seasonal to interannual timescales. To further...
Resource Type:: Article

Remineralization of phytoplankton-derived organic matter by natural populations of heterotrophic bacteria

Creator:: Burkhardt, Brian G., Watkins-Brandt, Katie S., Defforey, Delphine, Paytan, Adina, and White, Angelicque E.
Abstract:: The relative lability, elemental stoichiometry, and remineralization rates of various particulate organic matter (POM) substrates by natural heterotrophic marine microorganisms was investigated. POM was harvested from laboratory cultures of a marine diazotroph (Trichodesmium IMS101), a cosmopolitan diatom (Thalassiosira weissflogii), a common marine cyanobacteria (Prochlorococcus MED4), and from surface waters off...
Resource Type:: Article

Physiological Response of Crocosphaera watsonii to Enhanced and Fluctuating Carbon Dioxide Conditions

Creator:: Gradoville, Mary R., White, Angelicque E., and Letelier, Ricardo M.
Abstract:: We investigated the effects of elevated pCO₂ on cultures of the unicellular N₂-fixing cyanobacterium Crocosphaera watsonii WH8501. Using CO₂-enriched air, cultures grown in batch mode under high light intensity were exposed to initial conditions approximating current atmospheric CO₂ concentrations (~400 ppm) as well as CO₂ levels corresponding to low- and...
Resource Type:: Article

Phosphorus physiology and environmental forcing of oceanic cyanobacteria, primarily Trichodesmium spp.

Creator:: White, Angelicque E.
Abstract:: The biological transformation of dinitrogen gas (N2) into combined forms(termed N2 fixation) by certain genera of oceanic cyanobacteria represents the largest incoming flux of nitrogen to the global ocean. As such, biological nitrogen fixation plays a significant role in the regulation of oceanic productivity and the export of carbon and...
Resource Type:: Dissertation

Phenology of particle size distributions and primary productivity in the North Pacific subtropical gyre (Station ALOHA)

Creator:: White, Angelicque E., Letelier, Ricardo M., Whitmire, Amanda L., Barone, Benedetto, Bidigare, Robert R., Church, Matthew J., and Karl, David M.
Abstract:: The particle size distribution (PSD) is a critical aspect of the oceanic ecosystem. Local variability in the PSD can be indicative of shifts in microbial community structure and reveal patterns in cell growth and loss. The PSD also plays a central role in particle export by influencing settling speed. Satellite-based...
Resource Type:: Article

Particle distributions and dynamics in the euphotic zone of the North Pacific Subtropical Gyre

Creator:: Barone, Benedetto, Bidigare, Robert R., Church, Matthew J., Karl, David M., Letelier, Ricardo M., and White, Angelicque E.
Abstract:: During the summer of 2012, we used laser diffractometry to investigate the temporal and vertical variability of the particle size spectrum (1.25–100 µm in equivalent diameter) in the euphotic zone of the North Pacific Subtropical Gyre. Particles measured with this optical method accounted for ∼40% of the particulate carbon stocks...
Resource Type:: Article

Nitrogen fixation in the Gulf of California and the Eastern Tropical North Pacific

Creator:: White, Angelicque E., Foster, Rachel A., Benitez-Nelson, Claudia R., Masqué, Pere, Verdeny, Elisabet, Popp, Brian N., Arthur, Karen E., and Prahl, Fredrick G.
Abstract:: Di-nitrogen (N₂) fixation plays a well-recognized role in the enhancement of primary production and arguably particle export in oligotrophic regions of the subtropical and tropical oceans. However, recent evidence suggests that N₂ fixation may also be significant in regions of the surface ocean proximate to or overlying zones of intense...
Resource Type:: Article

New insights into bacterial acquisition of phosphorus in the surface ocean

Creator:: White, Angelicque E.
Abstract:: Since 1958 when Alfred C. Redfield (1) recognized the similarity between the ratios of elements in living biomass and those dissolved in the surrounding seawater, we have understood that microorganisms largely control the concentrations, distribution, and molecular makeup of nutritional resources in the ocean. The primary elemental ingredients for life,...
Resource Type:: Article

ScholarsArchive@OSU

The roles of MCDW and deep water iron supply in sustaining a recurrent phytoplankton bloom on central Pennell Bank (Ross Sea)

Summer surface waters in the Gulf of California: Prime habitat for biological N₂ fixation

Short-term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA: A case study of summer 2012

Remineralization of phytoplankton-derived organic matter by natural populations of heterotrophic bacteria

Physiological Response of Crocosphaera watsonii to Enhanced and Fluctuating Carbon Dioxide Conditions

Phosphorus physiology and environmental forcing of oceanic cyanobacteria, primarily Trichodesmium spp.

Phenology of particle size distributions and primary productivity in the North Pacific subtropical gyre (Station ALOHA)

Particle distributions and dynamics in the euphotic zone of the North Pacific Subtropical Gyre

Nitrogen fixation in the Gulf of California and the Eastern Tropical North Pacific

New insights into bacterial acquisition of phosphorus in the surface ocean

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