Index Catalog // ScholarsArchive@OSU

Creator:: Menge, Bruce A., Daley, Bryon A., Wheeler, Patricia A., and Strub, P. Ted
Abstract:: On Oregon coastal rocky shores, filter‐feeders were relatively abundant and macrophytes were relatively scarce at Strawberry Hill, whereas opposite abundance patterns occurred at Boiler Bay. To determine whether nearshore oceanographic differences were associated with these patterns, we made shore‐based measurements of nutrient and Chl a concentrations. We used a three‐level...
Resource Type:: Article
Full Text:: phytoplankton concentration. 1hl1110/. Ocrmlogr.. 42( I ), 1997, 57-M-i 0 1997, by the American Society of

Creator:: Wheeler, Patricia A. and McCarthy, James J.
Abstract:: The uptake of methylammonium (MA) by Chesapeake Bay phytoplankton was measured in short term experiments by using the 14C radioisotope. This uptake was inversely related to ambient NH4+ concentrations, and the specificity for uptake of both substrates was demonstrated by competitive inhibition. At stations with low ambient NH4+, MA uptake...
Resource Type:: Article
Full Text:: measurements Limnol. Oceanogr., 27(G), 1982, 1129-1140 @I 1982, by the American Society of Limnology and

Creator:: Wheeler, Patricia A., North, B., Littler, M., and Stephens, G.
Abstract:: Uptake of [14C]glycine by various size fractions of natural plankton communities was measured to determine if phytoplankton can compete effectively with other members of the plankton community for the free amino acids in seawater. The simultaneous occurrence of glycine uptake, plant pigments, and photosynthetic activity in the same size fractions,...
Resource Type:: Article
Full Text:: if phytoplankton can compete effectively with other members of the plankton community for the free

Creator:: Kristiansen, Svein, Farbrot, Tove, and Wheeler, Patricia A.
Abstract:: The uptake rates of nitrate, ammonium, and urea were measured with a ¹⁵N technique during seven cruises in the marginal ice zone (MIZ) in the Barents Sea in 1984–1988. The results from all the cruises were pooled to obtain means for the prebloom, bloom, transition, and postbloom periods. New production—nitrate...
Resource Type:: Article
Full Text:: zone Limnol. Oceanogr., 39(7), 1994, 1630-1642 0 1994, by the American Society of Limnology and

Creator:: Dickson, Mary-Lynn and Wheeler, Patricia A.
Abstract:: PN-specific, absolute, and Chl a-specific nitrate uptake rates were measured during two upwelling seasons and one winter off Oregon. Although PN-specific and absolute uptake rates showed no dependence on nitrate concentration, Michaelis-Menten kinetics applied when the uptake rates were normalized to Chl a. Chl a-specific nitrate uptake rates were saturated...
Resource Type:: Article
Full Text:: Limnol. Oceanogr., 40(3), 1995, 533-543 0 1995, by the American Society of Limnology and Oceanography

Creator:: Dickson, Mary-Lynn and Wheeler, Patricia A.
Abstract:: Chlorophyll a concentrations were measured as a function of depth from 28 to 48°N along 152°W in March 1991 with Whatman GF/F and 0.2‐µm Nuclepore filters. Surface Chl a concentrations measured with 0.2‐µm Nuclepore filters were up to fourfold higher than those measured with Whatman GF/F filters. The largest difference...
Resource Type:: Article
Full Text:: ). 1993, 1813-1818 (0 1993, by the Ameruzan Society of Limnology and Oceanography. Inc Chlorophyll a

Creator:: Kirchman, David L., Keil, Richard G., and Wheeler, Patricia A.
Abstract:: The purpose of this study was to test the hypothesis that NH4+ uptake by heterotrophic bacteria in the subarctic Pacific is C limited. Addition of glucose (0.5–1.0 μM) stimulated NH4+ uptake in unfractionated water but had no effect on bacterial abundance. Glucose stimulation of NH4+ uptake was even greater in...
Resource Type:: Article
Full Text:: . Oceanogr.. 35(6), 1990, 1258-1266 0 1990, by the American Society of Limnology and Oceanography, Inc

Creator:: Dickson, Mary-Lynn and Wheeler, Patricia A.
Resource Type:: Article
Full Text:: 1995, by the American Society of Limnology and Oceanography, Inc. Quantifying the role of

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...
Resource Type:: Article
Full Text:: , by the American Society of Limnology and Oceanography, Inc. Ammonium recycling limits nitrate use

Creator:: Wheeler, Patricia A. and Kirchman, David L.
Abstract:: The relative contribution of various inorganic and organic forms of nitrogen to the nitrogen requirements of picoplankton was examined with 15N tracers. Size fractionation was used to measure uptake by <1-μM size microorganisms, and inhibitors of protein synthesis were used to separate procaryotic from eucaryotic nitrogen uptake, Picoplankton utilized mainly...
Resource Type:: Article
Full Text:: 1986, by the American Society of Limnology and Oceanography, Inc. Utilization of inorganic and

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