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Diel variation of bacterial productivity in seagrass (Zostera capricorni) beds measured by rate of thymidine incorporation into DNA

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Abstract

Diurnal variations occurred in bacterial growth rates in the sediment and water column associated with seagrass (mainly Zostera capricorni Aschers) beds in Moreton Bay, Queensland, Australia. Studies were carried out in March and June 1981. Cell production rates increased by 5- to 10-fold during the morning and decreased during the afternoon. No nocturnal variation was observed. Daily bacterial cell production rate in the aerobic zones of the seagrass bed was estimated to be 43 mg C m-2. A minimum of 100 mg C m-2 d-1 would be required to support the bacterial production. This represents about 10% of net primary production. The incorporation of tritiated thymidine into DNA was used to measure bacterial growth. The validity of the method is discussed.

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Authors and Affiliations

  1. Division of Fisheries Research, CSIRO Marine Laboratories, P.O. Box 120, 4163, Cleveland, Queensland, Australia

    D. J. W. Moriarty & P. C. Pollard

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  1. D. J. W. Moriarty
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  2. P. C. Pollard
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Communicated by G. F. Humphrey, Sydney

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Moriarty, D.J.W., Pollard, P.C. Diel variation of bacterial productivity in seagrass (Zostera capricorni) beds measured by rate of thymidine incorporation into DNA. Marine Biology 72, 165–173 (1982). https://doi.org/10.1007/BF00396917

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