Potential Germination Success of Exotic and Native Trees Coexisting in Central Spain Riparian Forests

Table 3

Generalized linear models assessing the importance of seed age, seed bank type, and population on cumulative seed germination () and mean time to germinate () in A. altissima and R. pseudoacacia in the 2011-2012 experiment.

Species	A. altissima								R. pseudoacacia
Response variables
	df	D	RD	P	df	D	RD	P	df	D	RD	P	df	D	RD	P
Explanatory variables
Seed age (SA)	4	263.913	330.46	<0.001	4	149.826	249.72	<0.001	4	91.864	790.66	<0.001	4	140.983	469.72	<0.001
Seed bank type (SBT)	—	—	—	NS	1	70.299	179.42	<0.001	1	4.093	786.57	0.04	1	7.932	461.79	0.005
Population (POP)	1	23.766	306.70	<0.001	1	2.692	176.73	NS	1	29.579	756.99	<0.001	1	125.783	336.01	<0.001
SBT × POP	—	—	—	NS	1	6.767	169.96	0.01	1	4.784	752.21	0.03	—	—	—	NS

(df) degrees of freedom; (D) deviance; (RD) residual deviance; (P) P value of test used to evaluate if selected predictors explain a significant fraction of the deviance; NS, not significant).