Abstract
Production and doubling times of the bacterial populations in the water around and over the reefs at Lizard Island, Great Barrier Reef were measured during summer and winter, 1982 and 1983. Bacterial productivity, determined from the rate of tritiated thymidine incorporation into DNA, was high over the reef flats and a Thalassia hemprichii sand flat (28 to 58 μg Cl-1 d-1). Bacterial growth rates increased during the day and fell at night over the reef flats and seagrass bed. Growth rates were slower over the reef front and in open water. Doubling times ranged from about 2 d in the open water to about 3 h over the reef flat in summer. As numbers did not increase, grazing was probably intense on the reef flats. Growth rates were much slower in winter. The main source of organic nutrient used by the bacteria was probably mucus released following photosynthesis in the corals. The cyanobacterium Synechococcus sp. was sometimes very numerous, especially in summer when 2×108 cells l-1 were recorded in one water mass. The number of bacteria was also very high in summer, with values ranging from 1×109 to 2.5×109l-1.
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Literature cited
Crossland, C. J. and D. J. Barnes: Dissolved nutrients and organic particulates in water flowing over coral reefs at Lizard Island. Aust. J. mar Freshwat. Res. 34, 835–844 (1983)
Crossland, C. J., D. J. Barnes and M. A. Borowitzka: Diurnal lipid and mucus production in the staghorn coral Acropora acuminata. Mar. Biol. 60, 81–90 (1980)
Ducklow, H. W.: Chesapeake Bay nutrient and plankton dynamics. 1. Bacterial biomass and production during spring tidal destratification in the York Rive, Virginia, estuary. Limnol. Oceanogr. 27, 651–659 (1982)
Ducklow, H. W. and R. Mitchell: Composition of mucus released by coral reef coelenterates. Limnol. Oceanogr. 24, 706–714 (1979a)
Ducklow, H. W. and R. Mitchell: Bacterial populations and adaptations in the mucus layers on living corals. Limnol. Oceanogr. 24, 715–725 (1979b)
Es, van, F. B. and L.-A. Meyer-Reil: Biomass and metabolic activity of heterotrophic marine bacteria. Adv. microb. Ecol. 6, 111–170 (1983)
Fuhrman, J. A. and F. Azam: Bacterioplankton secondary production estimates for coastal waters of British Columbia, Antarctica, and California. Appl. envirl Microbiol. 39, 1085–1095 (1980)
Fuhrman, J. A. and F. Azam: Thymidine incorporation as a measure of heterotrophic bacterioplankton production in marine surface waters: evaluation and field results. Mar. Biol. 66, 109–120 (1982)
Gerber, R. P. and N. Marshall: Ingestion of detritus by the lagoon pelagic community at Eniwetok Atoll. Limnol. Oceanogr. 19, 815–824 (1974)
Gottfried, M. and M. R. Roman: Ingestion and incorporation of coral-mucus detritus by reef zooplankton. Mar. Biol. 72, 211–218 (1983)
Hobbie, J. E., R. J. Daley and S. Jasper: Use of Nuclepore filters for counting bacteria by fluorescence microscopy. Appl. envirl Microbiol. 33, 1225–1228 (1977)
Karl, D. M.: Simultaneous rates of RNA and DNA syntheses for estimating growth and cell division of aquatic microbial communities. Appl. envirl Microbiol. 42, 802–810 (1981)
Lewis, J. B.: Processes of organic production on coral reefs. Biol. Rev. 52, 305–347 (1977)
Marshall, N., A. G. Durbin, R. Gerber and G. Telek: Observations on particulate and dissolved organic matter in coral reef areas. Int. Revue ges. Hydrobiol. 60, 335–345 (1975)
Moriarty, D. J. W.: Biomass of suspended bacteria over coral reefs. Mar. Biol. 53, 193–200 (1979)
Moriarty, D. J. W.: Measurement of bacterial growth rates in aquatic systems using rates of nucleic acid synthesis. Adv. aquat. Microbiol. 3 (In press)
Moriarty, D. J. W. and P. C. Pollard: DNA synthesis as a measure of bacterial productivity in seagrass sediments. Mar. Ecol. Prog. Ser. 5, 151–156 (1981)
Moriarty, D. J. W. and P. C. Pollard: Diel variation of bacterial productivity in seagrass (Zostera capricorni) beds measured by rate of thymidine incorporation into DNA. Mar. Biol. 72, 165–173 (1982)
Moriarty, D. J. W., P. C. Pollard, W. G. Hunt, C. M. Moriarty and T. J. Wassenberg. Productivity of bacteria and microalgae and the effect of grazing by holothurians on a coral reef flat. Mar. Biol. 85, 293–300 (1985)
Newell, S. Y. and R. D. Fallon: Bacterial productivity in the water column and sediments of the Georgia (USA) coastal zone: estimates via direct counting and parallel measurement of thymidine incorporation. Microb. Ecol. 8, 33–46 (1982)
Pichon, M. and J. Morrissey: Benthic zonation and community structure of South Island reef, Lizard Island (Great Barrier Reef). Bull. mar. Sci. 31, 581–593 (1982)
Pollard, P. C. and D. J. W. Moriarty: Validity of isotope dilution of tritiated thymidine during incorporation into DNA as an estimate of bacterial growth rates. Appl. envirl Microbiol. 48, 1076–1083 (1984)
Richman, S., Y. Loya and L. B. Slobodkin: The rate of mucus production by corals and its assimilation by the coral reef copepod Acartia negligens. Limnol. Oceanogr. 20, 918–923 (1975)
Rublee, P. A., H. R. Lasker, M. Gottfried and M. R. Roman: Production and bacterial colonization of mucus from the soft coral Briarium asbestinum. Bull. mar. Sci. 30, 888–893 (1980)
Sorokin, Y. I.: Trophical role of bacteria in the ecosystem of the coral reef. Nature, Lond. 242, 415–417 (1973)
Sorokin, Y. I.: Bacteria as a component of the coral reef community. Proc. 2nd int. Symp. coral Reefs 1, 3–10 (1974). (Ed. by A. M. Cameron et al. Brisbane: Great Barrier Reef Committee)
Sorokin, Y. I.: Microbial production in the coral-reef community. Arch. Hydrobiol. 83, 281–323 (1978)
Westrum, B. L. and P. A. Meyers. Organic carbon content of seawater from over three Caribbean reefs. Bull. mar. Sci. 28, 153–158 (1978)
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Communicated by G. F. Humphrey, Sydney
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Moriarty, D.J.W., Pollard, P.C. & Hunt, W.G. Temporal and spatial variation in bacterial production in the water column over a coral reef. Marine Biology 85, 285–292 (1985). https://doi.org/10.1007/BF00393249
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DOI: https://doi.org/10.1007/BF00393249