. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 25 The liv C(5 . 35 um) is made up of heterotrophs and phytoplankton ( mg C nr3). It can be calculated using ATP(5 . 35 p,m) data : x x 250 = mg C nr3. The carbon content of heterotrophs in the size range from 5 to 35 |im was therefore equal to: - = mg C nr3. The biomass of ciliates and heteroflagellates was equal to mg C nr3 (Table 3), and the difference (= mg C nr3) was certainly due to bacteria adsorbed onto the detritus (Charpy, 1985). The total biomass of bacteria w
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 25 The liv C(5 . 35 um) is made up of heterotrophs and phytoplankton ( mg C nr3). It can be calculated using ATP(5 . 35 p,m) data : x x 250 = mg C nr3. The carbon content of heterotrophs in the size range from 5 to 35 |im was therefore equal to: - = mg C nr3. The biomass of ciliates and heteroflagellates was equal to mg C nr3 (Table 3), and the difference (= mg C nr3) was certainly due to bacteria adsorbed onto the detritus (Charpy, 1985). The total biomass of bacteria was therefore equal to : free bacteria + adsorbed bacteria = mg C nr3. Such a biomass is commonly observed in waters over reefs ; Sorokin (1974) summarizes data for biomasses of bacteria which range from 11 to 170 mg C nr3. More recently, Moriarty et al. (1985) reviewed the productivity and trophic role of bacteria on coral reefs. They give biomass values ranging from 19 to 150 mg C rrr3. Linley and Koop (1986) observed in the coral reef lagoon of One Tree Island (Great Barrier Reef) a biomass of heterotrophic bacteria ranging from to mg C nr3, and Hopkinson et al. (1987) observed a bacterial biomass of 2 mg C nr3 in the water column of Davies Reef (Australia). In Tikehau, in April 1986, the biomass of bacteria was estimated at mg C nr3 by Blanchot et al. (1989). The observed ratio free bacteria / adsorbed bacteria = 2 is consistent with the ratios given by Moriarty (1979) and Moriarty et al. (1985) in coral reef areas. The estimated bacterial biomass was 2 times higher than the phytoplanktonic C in the Tikehau lagoon. Dominance of bacterial biomass was also observed in the oligotrophic waters of the Sargasso Sea by Fuhrman et al. (1989); the interpretation of these authors was that bacteria consume sigificant amounts of carbon probably released from phytoplankton directly or via herbivores. DIC A - 440 PHYTOPLANKTON 225 ZOOPLANKTON >35 (jm 101 .36-200 fjm
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