TABLE 3.

Nonparametric multiple comparison of the relative contributions of populations Ac1 and BETA3 between predator-exposed reactors and control stages and between different predator reactors^a

Experiment	Population	No. of samples (days sampled)	Control stage vs Ochromonas sp.		Control stage vs C. glaucoma		Ochromonas sp. vs C. glaucoma
			Usb	P	Us	P	Us	P
1998	Ac1	9 (3–12)	81	<0.01	48.5	NSc	81	<0.01
	BETA3	9 (3–12)	81	<0.01	71	<0.05	81	<0.01
1999	Ac1	14 (3–16)	196	<0.01	106	NS	196	<0.01
	BETA3	14 (3–16)	196	<0.01	183	<0.01	195	<0.01

^aFor details of the statistical procedure, see the text. 

^bU_s, test parameter. 

^cNS, not significant at P values of <0.05.