TABLE 1.

H′ and R values of bacterial communities in test tanks and controls

Day	Total no. of bandsa		H′b		Ric
	Control tanks	Test tanks	Control tanks	Test tanks	Control tanks	Test tanks
1	16	17	2.76	2.82	0.59	0.63
15	26	13	3.25	2.55	0.96	0.48
29	24	12	3.17	2.46	0.89	0.44
43	24	11	3.17	2.30	0.81	0.41
57	22	10	3.08	2.38	0.81	0.41
85	25	9	3.13	2.19	0.93	0.33

^aTotal number of bands in a sample.

^bH′, Shannon diversity index, which is equal to −∑p_i ln p_i, where p_i is the proportion of each species in lane i at each sampling time.

^cR_i = L_i/LT, where R_i is the richness value of the bacterial community in lane i, L_i is the number of bands in lane i, and LT is total number of bands in the DGGE profile.