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Phytoplankton-bacteria interactions: an apparent paradox? Analysis of a model system with both competition and commensalism
236
E. BiologicalOceanography
may preferentially attack fishes initially injured by ostracods. Behavioral, evolutionary and ecological aspects of the phenomenon are discussed. Dept. of Biol. Sei., Univ. of Southern Calif., Los Angeles, CA 90089, USA.
OLR(1986)33 (3)
and June were found to vary with depth and coincide with the hydrographic ring structure. Observed increases in total biomass were accompanied by changes in trophic structure (relative numbers of small herbivores, large herbivores, and carnivores), which was attributed to influx of Slope Water species. Dept. of Biol., WHOI, Woods Hole, MA 02543, USA. (gsb)
ES0. Plankton (also primary productivity, seston and detritus) 86:1622 Bratbak, G. and T.F. Thingstad, 1985. Phytoplankton-bacteria interactions: an apparent paradox? Analysis of a model system with both competition and commensalism. Mar. Ecol.-Prog. Ser., 25(1): 23-30. Both a mathematical model and an experimental system were utilized in an attempt to clarify the interplay between algae, algal extracellular organic carbon (EOC), bacteria (which consume EOC), and the level of mineral nutrients. Under conditions of nutrient limitation but mineral carbon and light excess, it appeared that much of the primary production was consumed by microbes, resulting in a shift to a higher heterotroph/autotroph biomass ratio. Dept. of Microbiol. and Plant Physiol., Univ. of Bergen, Allegt 70, 5000 Bergen, Norway. (gsb) 86:1623 Collins, D.J., D.A. Kiefer, J.B. SooHoo and I.S. McDermid, 1985.3he role of reabsorption in the spectral distribution of phytoplankton fluorescence emission. Deep-Sea Res., 32(8):983-1003. A theoretical model accounts for both the absorption of the primary excitation and the modification of the fluorescence through the reabsorption of the emitted light by the chloroplast and surrounding medium. Comparisons are made between model results and data derived from experiments using a number of different phytoplankton species, each adapted to varying light conditions. Consequences of model interpretations on the spectral distribution of the fluorescence emission are examined. Jet Propulsion Lab., Calif. Inst. of Teeh., Pasadena, CA 91109, USA. 86:1624 Davis, C.S. and P.H. Wiebe, 1985. Macrozooplankton biomass in a warm--core Gulf Stream ring: time series ~*noes In size structure, taxonomic composition, and vertical dhtribution. J. geophys. Res., 90(C5):8871-8884. Macrozooplankton size structure and taxonomic composition of samples taken during March, April,
86:1625 Hopkins, T.L., 1985. The zooplankton community of Croker Passage, Antarctic Peninsula. Polar Biol., 4(3):161-170. Many of the 106 species identified from the upper I000 m were mesopelagic with copepods the most numerous species; Oncaea curvata comprised onehalf the zooplankton population. Three copepod species dominated zooplankton biomass (74%). Dominant species had broad vertical distributions both night and day. Estimation of total standing stock of net-caught zooplankton was 3.1 g DW/m 2. Dept. of Marine Sci., Univ. of South Florida, St. Petersburg, FL 33701, USA. (ahm) 86:1626 Ingrain, R.G., Louis Legendre, Yvan Simard and Serge Lepage, 1985. Phytoplankton response to freshwater runoff: the diversion of the Eastmain River, James Bay [Quebec]. Can. J. Fish. aquat. Sci., 42(6): 1216-1221. In the estuary, mean flow decreased by over 90% and the semidiurnal tidal amplitude increased significantly over a 5-d period. The most dramatic event was a major phytoplankton bloom in the river mouth, during a 10-d period of higher water column stability; the cells then remained and bloomed in the thin photic layer. Results emphasize the role of hydrodynamics (as determined here by the freshwater runoff) in the timing of phytoplankton blooms. Inst. of Oceanogr., McGill Univ., Montreal (Que.) H3A 2B2, Canada. 86:1627 Koszteyn, Jolanta and Alina Soltys-Krajewska, 1984. Structural ehanees and dis~bntion of the mesozooplankton in the Gulf of ~ in an annual cycle. Oceanologia, Warsz., 19:79-97. Polish Acad. of Sci., Inst. of Oceanol., Sopot Sea Fish. Inst., Gdynia, Poland. 86:1628 Laanbroek, H.J., J.C. Verplanke, P.R.M. de Visscher and R. de Vuyst, 1985. Distribution of phytoand Imcterioplankton growth and blemass parameters, dissolved inorgank nutrients and free amino acids during a spflng bloom in the
E. BiologicalOceanography
may preferentially attack fishes initially injured by ostracods. Behavioral, evolutionary and ecological aspects of the phenomenon are discussed. Dept. of Biol. Sei., Univ. of Southern Calif., Los Angeles, CA 90089, USA.
OLR(1986)33 (3)
and June were found to vary with depth and coincide with the hydrographic ring structure. Observed increases in total biomass were accompanied by changes in trophic structure (relative numbers of small herbivores, large herbivores, and carnivores), which was attributed to influx of Slope Water species. Dept. of Biol., WHOI, Woods Hole, MA 02543, USA. (gsb)
ES0. Plankton (also primary productivity, seston and detritus) 86:1622 Bratbak, G. and T.F. Thingstad, 1985. Phytoplankton-bacteria interactions: an apparent paradox? Analysis of a model system with both competition and commensalism. Mar. Ecol.-Prog. Ser., 25(1): 23-30. Both a mathematical model and an experimental system were utilized in an attempt to clarify the interplay between algae, algal extracellular organic carbon (EOC), bacteria (which consume EOC), and the level of mineral nutrients. Under conditions of nutrient limitation but mineral carbon and light excess, it appeared that much of the primary production was consumed by microbes, resulting in a shift to a higher heterotroph/autotroph biomass ratio. Dept. of Microbiol. and Plant Physiol., Univ. of Bergen, Allegt 70, 5000 Bergen, Norway. (gsb) 86:1623 Collins, D.J., D.A. Kiefer, J.B. SooHoo and I.S. McDermid, 1985.3he role of reabsorption in the spectral distribution of phytoplankton fluorescence emission. Deep-Sea Res., 32(8):983-1003. A theoretical model accounts for both the absorption of the primary excitation and the modification of the fluorescence through the reabsorption of the emitted light by the chloroplast and surrounding medium. Comparisons are made between model results and data derived from experiments using a number of different phytoplankton species, each adapted to varying light conditions. Consequences of model interpretations on the spectral distribution of the fluorescence emission are examined. Jet Propulsion Lab., Calif. Inst. of Teeh., Pasadena, CA 91109, USA. 86:1624 Davis, C.S. and P.H. Wiebe, 1985. Macrozooplankton biomass in a warm--core Gulf Stream ring: time series ~*noes In size structure, taxonomic composition, and vertical dhtribution. J. geophys. Res., 90(C5):8871-8884. Macrozooplankton size structure and taxonomic composition of samples taken during March, April,
86:1625 Hopkins, T.L., 1985. The zooplankton community of Croker Passage, Antarctic Peninsula. Polar Biol., 4(3):161-170. Many of the 106 species identified from the upper I000 m were mesopelagic with copepods the most numerous species; Oncaea curvata comprised onehalf the zooplankton population. Three copepod species dominated zooplankton biomass (74%). Dominant species had broad vertical distributions both night and day. Estimation of total standing stock of net-caught zooplankton was 3.1 g DW/m 2. Dept. of Marine Sci., Univ. of South Florida, St. Petersburg, FL 33701, USA. (ahm) 86:1626 Ingrain, R.G., Louis Legendre, Yvan Simard and Serge Lepage, 1985. Phytoplankton response to freshwater runoff: the diversion of the Eastmain River, James Bay [Quebec]. Can. J. Fish. aquat. Sci., 42(6): 1216-1221. In the estuary, mean flow decreased by over 90% and the semidiurnal tidal amplitude increased significantly over a 5-d period. The most dramatic event was a major phytoplankton bloom in the river mouth, during a 10-d period of higher water column stability; the cells then remained and bloomed in the thin photic layer. Results emphasize the role of hydrodynamics (as determined here by the freshwater runoff) in the timing of phytoplankton blooms. Inst. of Oceanogr., McGill Univ., Montreal (Que.) H3A 2B2, Canada. 86:1627 Koszteyn, Jolanta and Alina Soltys-Krajewska, 1984. Structural ehanees and dis~bntion of the mesozooplankton in the Gulf of ~ in an annual cycle. Oceanologia, Warsz., 19:79-97. Polish Acad. of Sci., Inst. of Oceanol., Sopot Sea Fish. Inst., Gdynia, Poland. 86:1628 Laanbroek, H.J., J.C. Verplanke, P.R.M. de Visscher and R. de Vuyst, 1985. Distribution of phytoand Imcterioplankton growth and blemass parameters, dissolved inorgank nutrients and free amino acids during a spflng bloom in the