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)
0.1–0.5	0.06	1.4–8.6	1.2 × 105	12–72
0.5–0.8	0.13	3.1–18.7	2.5 × 106	1.2–7.5
0.8–1.5	0.77	18.4–111	1.5 × 106	12–74
>1.5	0.04	0.96–5.8	2.6 × 105	3.7–22

^aAssumes that the uptake rate from grazing experiments would be constant over 24 h. 

^bIn MMR aquifer near head of the plume. 

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