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Creator:: Karl, David M., Hebel, Dale V., Björkman, K., and Letelier, Ricardo M.
Abstract:: Based on a long-term set of observations and measurements at a station in the subtropical North Pacific Ocean, it now appears that contemporaneous rates of primary production in low-nutrient open ocean regions and perhaps in the ocean as a whole may be greater than had been considered in field studies...
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Full Text:: KARL, DAVID M., DALE V. HEBEL, K. BJÖRKMAN, AND R. M. LETELIER

Creator:: Huyer, Adriana, 1945-, Pillsbury, R. Dale, and Smith, Robert L. (Robert Lloyd), 1935-
Abstract:: The seasonal variation in the alongshore velocity field is inferred from direct current observations made over the Oregon continental shelf at various locations and irregular intervals since 1965. Monthly mean currents are computed and compared with earlier studies to give a description of the seasonal variation in the alongshore currents....
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Full Text:: SHORE tkml 54 28 I2 I ’ I 1 h . % 20 t MEAN CURRENTS 2 AUGUST 1973 Shollowo

Creator:: Letelier, Ricardo M., Bidigare, Robert R., Hebel, Dale V., Ondrusek, M., Winn, C. D., and Karl, David M.
Abstract:: Algal chlorophyll and carotenoid distributions were measured periodically in the euphotic zone of Sta. ALOHA (22º45′N, 158º00′W) between February 1989 and October 1991 to document the variability in phytoplankton abundance and composition. The annual mean depth-integrated (O-200 db) concentration of Chl a displayed significant interannual variability. Seasonal patterns in Chl...
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Full Text:: given cruise were used to determine small temporal and spatial scale (h-km) variability of pigment

Creator:: Wheeler, Patricia A., Glibert, Patricia M., and McCarthy, James J.
Abstract:: Using 15N-labeled NH4+, we assessed the time-course of NH4+ uptake, the parameters of saturation kinetics, and the rates of incorporation of NH4+ into trichloroacetic acid-insoluble material by Chesapeake Bay phytoplankton. The amount of NH4+ taken up by the phytoplankton increased linearly with time for 2 h for all samples growing...
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Full Text:: - plankton increased linearly with time for 2 h for all samples growing on or exposed to high concentrations

Creator:: Thurber, Andrew R., Levin, Lisa A., Rowden, Ashley A., Sommer, Stefan, Linke, Peter, and Kroeger, Kerstin
Abstract:: During the discovery and description of seven New Zealand methane seep sites, an infaunal assemblage dominated by ampharetid polychaetes was found in association with high seabed methane emission. This ampharetid-bed assemblage had a mean density of 57,000 ± 7800 macrofaunal individuals m⁻² and a maximum wet biomass of 274 g...
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Full Text:: , based on stable isotope analyses (Thurber et al. 2010; Dale et al. 2010). This observation, combined

Creator:: Wheeler, Patricia A. and Kokkinakis, Steven A.
Abstract:: Seasonal and diel changes in nutrient concentrations and nitrogen assimilation rates were used to assess the effects of NH4+ on NO3- assimilation. Surface-water NO3- concentrations ranged from 6 to 17 μM while NH4+ concentrations ranged from 0 to 0.4 μM. Total N assimilation ranged from 84 to 732 nM d–1...
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Full Text:: of N taken up by phytoplankton are NO,- and NH,+. Dug- dale and Goering (1967) introduced the dis

Creator:: Laney, Samuel R., Letelier, Ricardo M., and Abbott, Mark R.
Abstract:: We examined variability in the natural fluorescence yield of a neritic diatom, Thalassiosira weissflogii, in continuous cultures. In this species, kinetics in natural fluorescence yield over time scales less than a photoperiod were characterized by sharp decreases, occurring at irradiance intensities that presumably coincide with the onset of nonphotochemical fluorescence...
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Full Text:: - 1 Corresponding author (slaney@coas.oregonstate.edu). Acknowledgments We thank Dale Kiefer for the

Creator:: Benoit-Bird, Kelly J., Cowles, Timothy J., and Wingard, Christopher E.
Abstract:: Physical, optical, and acoustical data from Monterey Bay, California, USA, describing the distributions of phytoplankton, zooplankton, and small fish as well as gradients in the physical habitat were used to examine the interactions between vertically compressed plankton structures (thin layers), their consumers, and the local physical forces they experience. The...
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Full Text:: below 22.0. In the second example, we conducted a 24-h time series of observations at a fixed point in

Creator:: Wetz, Michael S. and Wheeler, Patricia A.
Abstract:: Few studies have examined the partitioning of organic matter in upwelling systems, despite the fact that these systems play a key role in carbon and nitrogen budgets in the ocean. We examined the production and partitioning of phytoplankton-derived organic matter in deck incubations off Oregon during the upwelling season. During...
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Full Text:: based on newly available nitrogen (Dug- dale and Goering 1967) and is commonly determined from regional

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...
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Full Text:: s o f se a w a te r fr o m w h ic h T ri ch o d es m iu m co lo n ie s w er e co ll

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