Successional trends and processes on a glacial foreland in Southern Iceland studied by repeated species counts

Ecological Processes

Table 3 Statistical analyses of species data

Items	Sample year	Site A (2002)	Site B (1982)	Site C (1954)	Site D (1945)	Site E (1938)	Site F (1960)	Site G (1890–1904)	Site H (pre-1890)	Site I (pre-1890)
SR	2007	5	13	11	16	16	16	17	12	9
SR	2014	8	19	17	18	10	21	9	12	7
SD	2007	3	5.6	6.8	9.8	6.4	9.8	7.6	4.6	3.2
SD	2014	4	8.8	7.2	8.6	5.8	9.4	2.8	4.6	3.0
SE	2007	0.65	0.42	0.43	0.60	0.43	0.63	0.36	0.40	0.22
SE	2014	0.56	0.51	0.59	0.45	0.68	0.47	0.33	0.48	0.28
β _A	2007/2014	7	11	11	12	12	12	10	7	6
t test	2007/2014
VC		ns	0.03	ns	ns	ns	0.026	0.04	ns	ns
Moss		ns	0.024	ns	0.006	ns	ns	ns	ns	ns
Low shrubs		ns	ns	ns	ns	ns	ns	ns	ns	ns

SR species richness (vascular plants), SD species density (species/m²), SE species evenness, VC vegetative cover, β_A = absolute species turnover, ns (not significant) indicates p > 0.05