By T. M. Fenchel, B. Barker Jørgensen (auth.), M. Alexander (eds.)
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Extra info for Advances in Microbial Ecology
Fenchel and B. Barker Jorgensen Figure 13. Some bacterivorous ciliates. A, Sonderia schizostoma which feeds nearly exclusively on filaments of Beggiatoa. B-E, filtrating ciliates: B, Cyclidium glaucoma; C, Tetrahymena pyriformis; D, Vorticella campanularia; E, Euplotes sp. powerful membranelles which create water currents from which food particles can be collected (Fig. 13, E). ). , Sleigh, 1973, and references therein). Barsdate et al. (1974) and Fenchel (unpublished observations) studied the bacterial consumption of Tetrahymena pyriformis in model systems consisting of decomposing plant material and bacteria and using the technique of Fenchel (1975) for quantifying bacterial consumption of ciliates.
T. M. Fenchel and B. Barker Jorgensen 18 N E ::l- 0 20 52 ~ 10 ~ a; v 0 ~ :l. 820 flo9E'llotE'S ~ Q; a. 4 a. '- a, a. l rs Figure 7. The numbers of bacteria, zooflagellates, and ciliates in laboratory model systems based on fragmented, water-extracted barley hay and seawater and inoculated with natural detritus. Points, enriched with PO! -; open circles, enriched with NO;-; and filled circles, enriched with PO! - and NO;-. Note that the mineral nutrient enrichment has the greatest effect in terms of biomass on the bacterial grazers.
Initially oxygen is available, and aerobic mineralization takes place. When oxygen is almost depleted, nitrate takes over the role as the oxidizing agent. Sulfate reduction starts later in the sequence than nitrate because it requires more reducing conditions. Even more so does methane formation from CO 2 oxidation of H 2 . This thermodynamic differentiation of the processes may be the main reason for their succession with time and depth (Richards, 1965). Redox potentials typical ofthe zones where the four electron acceptors dominate are + 400, -100, - 200, and - 300 m V, respectively: An important functional aspect of the anaerobic electron acceptors is that they are diffusible substances that carry reducing energy up to the oxidized surface.
Advances in Microbial Ecology by T. M. Fenchel, B. Barker Jørgensen (auth.), M. Alexander (eds.)