Table 3.

Summary of growth experiments with copepods

Temperature	Treatment	Without competition			With competition
		μ [h−1]	Yield	p value	μ [h−1]	Yield	p value
20°C	Control	0.153	113 × 104	–	0.058	2.23 × 104	–
	50 cop	0.102	34.9 × 104	<0.01	0.049	1.68 × 104	<0.01
	150 cop	0.086	28.0 × 104	<0.01	0.047	1.56 × 104	<0.01
15°C	Control	0.146	250 × 104	–	0.101	71.4 × 104	–
	50 cop	0.091	7.78 × 104	<0.01	0.081	5.47 × 104	<0.01
	150 cop	0.076	41.6 × 104	<0.01	0.060	12.1 × 104	<0.01
10°C	Control	0.063	13.6 × 104	–	0.013	0.28 × 104	–
	50 cop	0.036	1.77 × 104	<0.01	0.012	0.37 × 104	n.s.
	150 cop	0.038	0.77 × 104	<0.01	0.009	0.36 × 104	n.s.

Data indicate calculated growth rates (μ) and growth yields of V. cholerae non-O1/non-O139 without (control) and with (50 and 150) added copepods (cop)

All experiments were performed ‘with competition’ (2-μm filtered lake water) and ‘without initial competition’ (sterile filtered lake water) by the natural bacterial community

Each single μ and yield value is derived from one growth curve consisting of 12 consecutive sampling points

The p value indicates the significance of the difference in cell numbers between control and the cultures with copepods (paired T test; based on cell number data in logarithmic and stationary phase)

n.s. Not significant