Abstract
The rate of primary production, excretion of photosynthetic products and turnover of glucose and amino acids was measured at a station in a coastal region in the Bahamas. Over the depths 0 to 50 m, total photosynthetic rates varied from 1.7 to 12.7 μgC fixed 1-1day-1, averaging 4.3. The extent of extracellular photosynthetic products ranged from undetectable to 23%, averaging 6.9%. Neither the field data nor studies with axenic cultures of Dunaliella tertiolecta, Skeletonema costatum, and Monochrysis lutheri showed any evidence of an increase in the percentage excretion at low population densities or low photosynthetic rates. Rates of amino acid turnover varied from 21 to 168% day-1, and that of glucose from 8.3 to 41% day-1. Light seems to have little effect on the uptake and respiration of these substrates by the planktonic population. There was a significant relationship between the fraction of the substrate used for respiration and that retained by the cell. On average, 42% of the glucose taken up was respired and 21% of the amino acid mixture. Tentative calculations suggest that the production of dissolved organic material as extracellular photosynthetic products would be insufficient to supply the heterotrophic population, and it was concluded that some other route(s) must be of major importance.
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Literature Cited
Anderson, G.C. and R.P. Zeutschel: Release of dissolved organic matter by marine phytoplankton in coastal and offshore areas of the Northeast Pacific Ocean. Limnol. Oceanogr. 15, 402–407 (1970)
Andrews, P. and P.J. Le B. Williams: Heterotrophic utilization of organic compounds in the sea. III. Measurement of the oxidation rates and concentrations of glucose and amino acids in sea water. J. mar. biol. Ass. U.K. 51, 111–125 (1971)
Armstrong, F.A.J., P.M. Williams and J.D. Strickland: Photo-oxidation of organic matter in seawater by ultraviolet radiation, analytical and other applications. Nature, Lond. 211, 481–483 (1966)
Banoub, M.W. and P.J. Le B. Williams: Measurement of microbial activity and organic material in the western Mediterranean Sea. Deep-Sea Res. 19, 433–443 (1972)
Barber, R.T. and J.H. Ryther: Organic chelators: factors affecting primary production in the Cromwell Current Upwelling. J. exp. mar. Biol. Ecol. 3, 191–199 (1969)
Berman, T. and O. Holm-Hansen: Release of photoassimilated carbon as dissolved organic matter by marine phytoplankton. Mar. Biol. 28, 305–310 (1974)
Choi, C.I.: Primary production and release of dissolved organic carbon from phytoplankton in the Western North Atlantic Ocean. Deep-Sea Res. 19, 731–735 (1972)
Crawford, C.C., J.E. Hobbie and K.L. Webb: The utilization of dissolved free amino acids by estuarine micro-organisms. Ecology 55, 551–563 (1974)
Derenbach, J.B. and P.J. Le B. Williams: Autotrophic and bacterial production: fractionation of plankton populations by differential filtration of samples from the English Channel. Mar. Biol. 25, 263–269 (1974)
Fogg, G.E., C. Nalewajko and W.D. Watt: Extracellular products of phytoplankton photosynthesis. Proc. R. Soc. (Ser. B) 162, 517–534 (1965)
Guillard, R.R.L. and J.H. Ryther: Studies on marine planktonic diatoms. I. Cyclotella nana Hustedt and Detonular confervacea (Cleve) Gran. Can. J. Microbiol. 8, 229–239 (1962)
Hamilton, R.D. and J.E. Preslan: Observations on heterotrophic activity in the Eastern Tropical Pacific. Limnol. Oceanogr. 15, 395–401 (1970)
Hellebust, J.A.: Excretion of some organic compounds by marine phytoplankton. Limnol. Oceanogr. 10, 192–206 (1965)
Hobbie, J.E. and C.C. Crawford: Respiration corrections for bacterial uptake of dissolved organic compounds in natural waters. Limnol. Oceanogr. 14, 528–532 (1969)
— and K.L. Webb: Amino acid flux in an estuary. Science, N.Y. 159, 1463–1464 (1968)
Horne, A.J., G.E. Fogg and D.J. Eagle: Studies in situ of the primary production of an area of inshore Antarctic Sea. J. mar. biol. Ass. U.K. 49, 393–405 (1969)
Ignatiades, L.: Studies on the factors affecting the release of organic matter by Skeletonema costatum (Greville) Cleve in field conditions. J. mar. biol. Ass. U.K. 53, 923–935 (1973)
— and G.E. Fogg: Studies on the factors affecting the release of organic matter by Skeletonema costatum (Greville) Cleve in culture. J. mar. biol. Ass. U.K. 53, 937–956 (1973)
Payne, W.J.: Energy yields and growth of heterotrophs. A. Rev. Microbiol. 24, 17–52 (1970)
Ryther, J.H., D.W. Menzel, E.M. Hulbert, C.J. Lorenzen and N. Corwin: The production and utilization of organic matter in the Peru coastal current. Investigación pesq. 35, 43–59 (1971)
Steemann-Nielsen, E.: The use of radioactive carbon (c14) for measuring organic production in the sea. J. Cons. perm. int. Explor. Mer 18, 117–140 (1952)
Stephens, G.C. and B.B. North: Extrusion of carbon accompanying uptake of amino acids by marine phytoplankters. Limnol. Oceanogr. 16, 752–757 (1971)
Strickland, J.D.H. and T.R. Parsons: A practical handbook of sea water analysis. Bull. Fish. Res. Bd Can. 167, 1–282 (1968)
Thomas, J.P.: Release of dissolved organic matter from natural populations of marine phytoplankton. Mar. Biol. 11, 311–323 (1971)
Thomas, W.H.: On nitrogen deficiency in tropical Pacific oceanic phytoplankton: photosynthetic parameters of poor and rich water. Limnol. Oceanogr. 15, 380–385 (1970)
—, E.H. Renger and A.N. Dodson: Near surface organic nitrogen in the eastern tropical Pacific Ocean. Deep-Sea Res. 18, 65–71 (1971)
Vaccaro, R.F., S.E. Hicks, H.W. Jannasch and F.G. Carey: The occurrence and role of glucose in sea water. Limnol. Oceanogr. 13, 596–607 (1968)
— and H.L. Jannasch: Studies on heterotrophic activity in sea water based on glucose assimilation. Limnol. Oceanogr. 11, 596–607 (1966)
Watt, W.D.: Release of dissolved organic material from the cells of phytoplankton populations. Proc. R. Soc. (Ser. B) 164, 521–551 (1966)
Williams, P.J. Le B.: Heterotrophic utilization of dissolved organic compounds in the sea. I. Size distribution of population and relationship between respiration and incorporation of growth substrates. J. mar. biol. Ass. U.K. 50, 859–870 (1970)
— and C. Askew: A method of measuring the mineralization by microorganisms of organic compounds in sea water. Deep-Sea Res. 15, 365–375 (1968)
—, T. Berman and O. Holm-Hansen: Potential sources of error in the measurement of low rates of planktonic photosynthesis and excretion. Nature, Lond. 236, 91–92 (1972)
——: Amino acid uptake and respiration by marine heterotrophs. Mar. Biol. 35, 41–47 (1976)
— and R.W. Gray: Heterotrophic utilization of dissolved organic compounds in the sea. II. Observations on the response of heterotrophic marine populations to abrupt increases in amino acid concentration. J. mar. biol. Ass. U.K. 50, 871–881 (1970)
Wright, R.T. and J.E. Hobbie: Use of glucose and acetate by bacteria and algae in aquatic ecosystems. Ecology 47, 447–468 (1966)
Yentsch, C.S. and D.W. Menzel: A method for the determination of phytoplankton chlorophyll and phaeophytin by fluorescence. Deep-Sea Res. 10, 221–231 (1963)
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Communicated by J.S. Pearse, Santa Cruz
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Williams, P.J.L.B., Yentsch, C.S. An examination of photosynthetic production, excretion of photosynthetic products, and heterotrophic utilization of dissolved organic compounds with reference to results from a coastal subtropical sea. Mar. Biol. 35, 31–40 (1976). https://doi.org/10.1007/BF00386672
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DOI: https://doi.org/10.1007/BF00386672