TABLE 4.

Model averaged parameters for predicting ureC copy number (ureolytic potential) using conditional averaging.

Variable	Relative variable importance	B	Se	z	P
Intercept		1258.4	642.2	1.92	0.06
Ammonia	0.87	2605.8	1654.7	1.54	0.12
Bromide	0.59	–1388.3	853.6	1.54	0.12
pH	0.48	1715.5	1219.5	1.36	0.17
ammonia * bromide	0.17	–1552.3	890.6	1.62	0.10
DNA	0.08	–881.6	662.4	1.25	0.21
ammonia * pH	0.20	6093.7	4510.8	1.31	0.19
Sulfate	0.06	6393.5	2001.5	2.97	0.003
ammonia * sulfate	0.06	18078.7	5814.2	2.89	0.004

Parameters listed are only those that are in the top models (delta AICc < 2) shown in Table 2. Variables as defined in Table 3.