Table 4.

Estimates of impact of groundwater nanoflagellates on the unattached bacterial standing crop

Bacterial cell length (μm)Uptake rate (bacteria · protist−1 · h−1)Consumption ratea (bacteria · ml−1 · day−1) (104)Avg unattached bacterial concnb(ml−1)% of unattached bacterial standing crop consumedc (day−1)
0.1–0.50.061.4–8.61.2 × 105 12–72
0.5–0.80.133.1–18.72.5 × 106 1.2–7.5
0.8–1.50.7718.4–1111.5 × 106 12–74
>1.50.040.96–5.82.6 × 105 3.7–22
  • a Assumes that the uptake rate from grazing experiments would be constant over 24 h.

  • b In MMR aquifer near head of the plume.

  • c Calculated by using the nanoflagellate concentration in the MMR aquifer near the head of the plume (1 × 104 to 6 × 104 ml−1).