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Tibbles BJ, Davis CL, Harris JM, et al. Estimates of bacterial productivity in marine sediments and water from a temperate saltmarsh lagoon. Microb Ecol. 1992;23(3):195-209doi: 10.1007/BF00164096.
Tibbles, B. J., Davis, C. L., Harris, J. M., & Lucas, M. I. (1992). Estimates of bacterial productivity in marine sediments and water from a temperate saltmarsh lagoon. Microbial ecology, 23(3), 195-209. https://doi.org/10.1007/BF00164096
Tibbles, B J, et al. "Estimates of bacterial productivity in marine sediments and water from a temperate saltmarsh lagoon." Microbial ecology vol. 23,3 (1992): 195-209. doi: https://doi.org/10.1007/BF00164096
Tibbles BJ, Davis CL, Harris JM, Lucas MI. Estimates of bacterial productivity in marine sediments and water from a temperate saltmarsh lagoon. Microb Ecol. 1992 May;23(3):195-209. doi: 10.1007/BF00164096. PMID: 24192931.
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Microb Ecol. 1992 May;23(3):195-209. doi: 10.1007/BF00164096.

Estimates of bacterial productivity in marine sediments and water from a temperate saltmarsh lagoon.

Microbial ecology

B J Tibbles, C L Davis, J M Harris, M I Lucas

Affiliations

  1. Marine Biology Research Institute, Department of Zoology, University of Cape Town, Rondebosch 7700, South Africa.

PMID: 24192931 DOI: 10.1007/BF00164096

Abstract

Tritiated thymidine incorporation (TTI) into DNA was used to estimate bacterial productivity in sediment and water samples from two sites in Langebaan Lagoon, South Africa. Routine analysis of isotope dilution showed seasonal variations of approximately threefold in the thymidine precursor pool sizes for bacterial assemblages from each site. Dual label incorporation of [(3)H]-thymidine and (14)C-leucine into DNA and protein, respectively, showed that pelagic but not sediment assemblages were in a balanced state of growth during TTI. This is the first report of dual label measurements of bacterial production in sediments. Sediments supported bacterial productivities that exceeded those in the water column by factors from five- to 950-fold, whereas bacterial abundance supported by sediments exceeded that in the water column by more than 3 orders of magnitude. Estimates of bacterial productivities in sediments were coincident with levels of organic content in sediments, but not with bacterial abundance. Measurements of TTI activity for 5 different benthic microhabitats at one lagoon site showed highest activity associated with seagrass beds (2.11 ± 0.84 nmol thymidine hours(-1) g-1 dry weight), whereas activities decreased with depth (0.46 ± 0.21 nmol thymidine hours(-1) g(-I) dry weight) below sediment surface.

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