Index Catalog // ScholarsArchive@OSU

Creator:: Wetz, Michael S., Wheeler, Patricia A., and Letelier, Ricardo M.
Abstract:: Despite the importance of the spring phytoplankton bloom off Oregon as a food source for zooplankton, little is known about the sources of phytoplankton seed stock for the bloom or its timing. Experiments were conducted in the late winter to determine if the benthic boundary layer (BBL) could be a...
Resource Type:: Article
Full Text:: from the benthic boundary layer off Oregon, USA Michael S. Wetz*, Patricia A. Wheeler, Ricardo M

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

Creator:: Wilson, Samuel T., Barone, Benedetto, Ascani, Francois, Juranek, Laurie W., Letelier, Ricardo M., White, Angelicque E., and et al.
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...
Full Text:: Ferrón1,2, Jessica N. Fitzsimmons1,6, LaurieW. Juranek7, Zbigniew S. Kolber1,8, Ricardo M. Letelier1,7

Creator:: Kavanaugh, Maria T., Emerson, Steven R., Hales, Burke, Lockwood, Deirdre M., Quay, Paul D., and Letelier, Ricardo M.
Abstract:: The subarctic-subtropical transition zone in the North Pacific represents the second largest sink of atmospheric carbon dioxide in the world ocean, yet the relative importance of physical and biological processes in this uptake is debated. In a step toward understanding the spatiotemporal variability of environmental, physiological, and ecological factors that...
Resource Type:: Article
Full Text:: Paul D. Quay,2 and Ricardo M. Letelier 3 1 Department of Marine Chemistry and Geochemistry, Woods Hole

Creator:: Sakamoto, Carole M., Karl, David M., Jannasch, Hans W., Bidigare, Robert R., Letelier, Ricardo M., Walz, Peter M., Ryan, John P., Polito, Paulo S., and Johnson, Kenneth S.
Abstract:: Nitrate concentrations, chlorophyll a (Chl a) fluorescence, radiance, salinity, and temperature were measured on the Hawaii Air-Sea Logging Experiment, A Long-Term Oligotrophic Habitat Assessment (HALE ALOHA) mooring located near the Hawaii Ocean Time-Series (HOT) Program’s Station ALOHA (22°45’N; 158°W). Nitrate concentrations were determined with OsmoAnalyzers deployed at depths of 120...
Resource Type:: Article
Full Text:: . Karl,2 Hans W. Jannasch,1 Robert R. Bidigare,2 Ricardo M. Letelier,3 Peter M. Walz,1 John P. Ryan,1

Creator:: Landry, Michael R., Brown, Susan L., Selph, Karen E., Abbott, Mark R., Letelier, Ricardo M., Christensen, Stephanie, Bidigare, Robert R., and Casciotti, K.
Abstract:: During austral summer 1997, satellite imagery revealed enhanced chlorophyll associated with the Antarctic Polar Front at 170°W. Phytoplankton growth conditions during the early stages of the spring increase were investigated on the Antarctic Environment and Southern Ocean Process Study Survey I cruise using flow cytometry (FCM) and microscopy to characterize...
Resource Type:: Article

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