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

Table 2

Seed mean dry weight, cumulative seed germination (), mean time to germination (), and germination success ( = % viable seeds) of the studied species in the 2013 experiment (means ± SE). In R. pseudoacacia, values in parentheses correspond to untreated seeds. In the case of A. altissima and R. pseudoacacia values for different populations (Jadraque and Alcalá) are shown.

Site	Species	Dry weight (mg)	Viable seeds	Empty seeds	Insect-damaged seeds	(%)	(days)	(%)
Jadraque	A. altissima	19.9 ± 0.4	100 ± 0	0 ± 0	0 ± 0	67 ± 4	12 ± 1	67
	R. pseudoacacia	15.8 ± 0.2	50 ± 6	35 ± 5	15 ± 4	68 ± 4 (14 ± 3)	7 ± 1 (7 ± 1)	33 ()
	F. angustifolia	48.0 ± 1.9	79 ± 5	19 ± 5	2 ± 1	14 ± 4	14 ± 1	11
Alcalá	A. altissima	24.6 ± 0.4	98 ± 1	2 ± 1	0 ± 0	97 ± 2	12 ± 1	94
	R. pseudoacacia	16.6 ± 0.3	59 ± 7	12 ± 3	29 ± 8	92 ± 2 (7 ± 2)	3 ± 0 (6 ± 1)	54 ()
	U. pumila	9.7 ± 0.2	73 ± 4	27 ± 4	0 ± 0	99 ± 1	2 ± 0	73
	U. minor	5.1 ± 0.2	36 ± 5	64 ± 5	0 ± 0	91 ± 3	2 ± 0	33

Lowercase letters indicate significant interspecific differences within each site on the basis of multiple comparison post hoc test. For species present in both sites (A. altissima and R. pseudoacacia), uppercase letters indicate significant differences between populations (Wilcoxon test). Significant differences between pretreated and nontreated R. pseudoacacia seeds in the same parameter, on the basis of a Wilcoxon test.