The relationship between bacteria and micro-algae in the sediment of a Bay of Fundy mudflat |
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| Affiliation: | 1. School of Science, University of Waikato, Private Bag 3105, Hamilton, New Zealand;2. National Institute of Water and Atmospheric Research Ltd. (NIWA), PO Box 11115, Hamilton, New Zealand;3. Institute of Marine Science, University of Auckland, PO Box 349, Warkworth, New Zealand;1. College of Environmental Science and Engineering, Dalian Maritime University, Dalian, China;2. Environmental Information Institute, Dalian Maritime University, Dalian, China |
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| Abstract: | Bacterial abundance was studied from April to December 1979 in the sediments of a Bay of Fundy mudflat. Bacterial biomass ranged from 1·6 to 2·8 g C m−2 in the top 5 cm and bacterial numbers normalized for the amount of organic carbon in the sediment were about 9 × 1011 g−1 C at the surface during most of the year. However, when a bloom of pennate diatoms occurred in the fall, bacterial numbers per gram carbon doubled. There was a correlation of r=0·83 between bacteria g−1 C and chlorophyll a for all sampling dates at the high intertidal station. Sieved size fractions of surface sediment taken during a period of low micro-algal biomass and just after the micro-algal bloom showed a strong correlation (r=0·92) between the increases in bacterial and algal abundance for the fractions > 20 μm. We suggest that the apparent relation between benthic micro-algal and bacterial abundance on both a seasonal and within-sediment basis may be due to the release of extracellular material by the micro-algae. |
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