Index Catalog // ScholarsArchive@OSU

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
Full Text:: : _____________________________________________________________________ Ricardo M. Letelier Yvette H. Spitz The biological

Modeling carbohydrate ballasting by Trichodesmium spp.

Creator:: White, Angelicque E., Spitz, Yvette H., and Letelier, Ricardo M.
Abstract:: We report the development of a numerical model simulating vertical movement of the cyanobacterium Trichodesmium spp. Given a range of physiological parameters derived from the literature, resultant model solutions allow us to explore the ecological significance of vertical migration by Trichodesmium colonies in a stratified oligotrophic oceanic system such as...
Resource Type:: Article
Full Text:: carbohydrate ballasting by Trichodesmium spp. Angelicque E. White*, Yvette H. Spitz, Ricardo M. Letelier

GradovilleMaryCEOASPhysiologicalResponseCrocosphaera.pdf

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...
Full Text:: *, Angelicque E. White, Ricardo M. Letelier Oregon State University, College of Earth, Ocean, and Atmospheric

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
Full Text:: : Prime habitat for biological N2 fixation Angelicque E. White,1 Fredrick G. Prahl,1 Ricardo M. Letelier

Flexible elemental stoichiometry in Trichodesmium spp. and its ecological implications

Creator:: White, Angelicque E., Spitz, Yvette, Karl, David, and Letelier, Ricardo M.
Abstract:: We conducted laboratory experiments to assess the bioelemental plasticity of cultures of Trichodesmium IMS101 under phosphorus (P)-replete, P-restricted, and light-limited conditions. The results reveal a high degree of stoichiometric flexibility. Specifically, Trichodesmium IMS101 is capable of growth with carbon (C) : nitrogen (N) : P ratios of C₅₈₅±₅₆ : N₉₀±₁₀...
Resource Type:: Article
Full Text:: Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822 Ricardo M. Letelier College

GradovilleMaryCEOASPhysiologicalResponseCrocosphaera_TableS1.pdf

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...

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

Diversity trumps acidification : lack of evidence for carbon dioxide enhancement of Trichodesmium community nitrogen or carbon fixation at Station ALOHA

Creator:: Gradoville, Mary R., White, Angelicque E., Böttjer, Daniela, Church, Matthew J., and Letelier, Ricardo M.
Abstract:: We conducted 11 independent short-term carbon dioxide (CO₂) manipulation experiments using colonies of the filamentous cyanobacteria Trichodesmium isolated on three cruises in the North Pacific Subtropical Gyre (NPSG). Dinitrogen (N₂) and carbon (C) fixation rates of these colonies were compared over CO₂ conditions ranging from ~ 18 Pa (equivalent to...
Resource Type:: Article
Full Text:: . Church,2 and Ricardo M. Letelier 1 1 Oregon State University, College of Earth, Ocean, and Atmospheric

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
Full Text:: ., Letelier, R. M., Whitmire, A. L., Barone, B., Bidigare, R. R., Church, M. J., & Karl, D. M. (2015

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
Full Text:: ., Letelier, R. M., & White, A. E. (2015). Particle distributions and dynamics in the euphotic zone of the

ScholarsArchive@OSU

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

Modeling carbohydrate ballasting by Trichodesmium spp.

GradovilleMaryCEOASPhysiologicalResponseCrocosphaera.pdf

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

Flexible elemental stoichiometry in Trichodesmium spp. and its ecological implications

GradovilleMaryCEOASPhysiologicalResponseCrocosphaera_TableS1.pdf

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

Diversity trumps acidification : lack of evidence for carbon dioxide enhancement of Trichodesmium community nitrogen or carbon fixation at Station ALOHA

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

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