Abundance and productivity of bacteria in Osaka bay, eastern Seto inland sea, Japan
1997
Imai, I. (Kyoto Univ. (Japan)) | Yamaguchi, M.
Abundance and productivity of marine bacteria were investigated in Osaka Bay, eastern Seto Inland Sea, from September 1984 to June 1983. The mean cell volume of bacteria measured by image analysis ranged between 0.041 and 0.107 mu-m(3) (mean of total measurements=0.073 mu-m(3), n=6900). Bacteria determined with DAPI-staining and epifluorescence microscopy were 0.40 x 10(6) to 5.08 x 10(6) cells.ml(-1) in number and 2.30 to 37.78 mu-gC.1(-1) in biomass. Integrated biomass in the water column varied from 0.04 to 0.93 gC.m(-2) (mean of total measurements=0.28 gC.m(-2), n=72). Total biomass in the whole of Osaka Bay was estimated to be 237-662 tonC (mean=428 tonC). Bacterial productivity measured by FDC (Frequency of Dividing Cells) method ranged between 0.17 and 136.38 mu-gC.1(-1).day(-1). Mean bacterial productivity in water column varied from 0.06 to 0.95 gC.m(-2).day(-1) (mean of total measurements=0.43 gC.m(-2).day(-1)). Total bacterial productivity in the whole of Osaka Bay was calculated to be 95-1447 tonC.day(-1), and annual production was estimated to be j2.4 x 105 tonC. Bacterial abundance and productivity tended to be higher in the warmer season. The mean ratio of bacterial productivity to primary productivity of phytoplankton was 16.3%, suggesting that bacteria utilize about one-third of primary production in the water column of Osaka Bay
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