Secondary reproduction in the herbaceous monocarp Lobelia inflata: time-constrained primary reproduction does not result in increased deferral of reproductive effort

Table 1 Results of binomial logistic regression analysis of factors affecting likelihood of SRE expression

Term	Parameter estimate (±SE)	Wald chi-square statistic	df	p	Estimated odds ratio
Constant	−2.34 (0.35)	45.25	1	0.23	-
Year = 2008	−0.30 (0.20)	2.27	1	0.74	1.07
Year = 2009	0.07 (0.17)	0.16	1	1.07	0.74
Year = 2010	0	-	-	-	1.00
Bolting month = June	2.93 (0.24)	149.82	1	< 0.001*	18.79
Bolting month = July	2.45 (0.23)	108.93	1	<0.001*	11.61
Bolting month = August	0.81 (0.24)	11.49	1	<0.001*	2.26
Bolting month = September	0	-	-	-	1.00
Size	0.02 (0.01)	3.33	1	0.07	1.02

The four bolting groups were experimentally produced using a photoperiod manipulation, and this manipulation was repeated for three years from 2008-10. Prebolting plant size was measured as the length (in mm) of the longest living leaf of the unbolted rosette. The regression model significantly predicts likelihood of SRE expression (χ² = 274.52, df = 6, p < 0.005). Odds ratios express relative likelihood of SRE expression.
*p < 0.05.

ISSN: 1472-6785