Transitional Strategies of Juvenile Green Sturgeon from a Riverine to a Brackish Water Environment

Table 3

Summary of logistic regression models (equation (2)) relating average environmental conditions during two windows of time for different choices of interval length (∆T) to whether or not an individual had begun movement associated with leaving the upper reach.

Covariate	∆T	Estimate	Std. error	z-value	-value	Model deviance	% null dev.
Flow	0.5	0.49	0.11	4.40	<0.01	133.29	18.52
	1	1.00	0.18	5.70	<0.01	101.82	37.76
	2	1.95	0.34	5.73	<0.01	82.14	49.78
	3	1.62	0.32	5.13	<0.01	115.27	29.54
	10	0.48	0.28	1.73	0.08	160.14	2.10
Turbidity	0.5	0.04	0.02	2.41	0.02	154.90	4.79
	1	0.19	0.03	5.36	<0.01	118.23	28.89
	2	0.96	0.23	4.15	<0.01	63.11	61.42
	3	0.51	0.10	5.31	<0.01	107.35	33.55
	10	1.02	0.20	5.16	<0.01	116.30	28.58
Temperature	0.5	0.06	0.24	0.27	0.79	163.51	0.04
	1	−0.00	0.24	−0.02	0.99	163.58	<0.01
	2	−0.14	0.23	−0.62	0.54	163.20	0.23
	3	−0.24	0.26	−0.94	0.35	162.69	0.54
	10	−0.63	0.40	−1.59	0.11	160.80	1.70

Results are for the environmental covariate slope parameter (β4 in equation (2)), the model deviance, and percent null deviance explained (% null dev.).