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. 2017 May 3;12(5):e0176869. doi: 10.1371/journal.pone.0176869

Table 1. Differences in the survival of four floodplain meadow species among five age groups.

species family micro-habitat EIV m chisq df p survival differences
age2 age4 age6 age8 noFl
Sanguisorba officinalis L. Rosaceae wet 7 ~ 31.5 4 <0.001 a a b c b
Sanguisorba minor Scop. Rosaceae dry 3 94.5 4 <0.001 a b c d c
Veronica maritima L. Plantaginaceae wet 8 ~ 0.0 4 1 a a a a a
Veronica teucrium L. Plantaginaceae dry 3 66.2 4 <0.001 ab a c b c

Differences were tested using a Wilcoxon-Mann-Whitney test (chi-square statistic), and subsequently, each paired combination was tested using a log-rank test with scores of Sun [50] for interval censored data (Z statistic). Four groups differed in seedling age at start of flooding period (age2-age8) and one group was the unflooded control (noFl). EIV m, Ellenberg indicator value for moisture;

~, indicator for alternating moisture conditions (F value, Ellenberg et al. [47]); chisq, chi-square value; df, degrees of freedom; p, error probability; p values < 0.05 are in bold; survival differences, significant differences (p < 0.05) in survival of plants between age groups according to log-rank test; for each species-seedling age combination: n = 20.

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