. 2019 Nov 14;9:16805. doi: 10.1038/s41598-019-53250-x

Table 1.

Statistical results of the main phytoplankton groups (>5% abundance of total phytoplankton biomass).

Day, No. observations (n), Degrees of freedom (df)	model	Total biovolume	Chlorophyta colonies	Other flagellates
21 n = 18 df = 17	Lr ANOVA	p r² p F	0.02 -0.31	0.39^a 0.04 0.35^b 5.61	0.01 -0.38 0.08^b 9.73
28 n = 18 df = 17	Lr ANOVA	p r² p F	0.01 -0.35	0.07 0.20 0.18 1.84	0.01 -0.37 0.10 2.44
35 n = 13 df = 7	Lr ANOVA	p r² p F	0.84 0.00	0.41^a 0.06 0.44^b 4.81	0.86 0.00 0.47 1.02
49 n = 18 df = 17	Lr ANOVA	p r² p F	0.32 0.06	0.02 +0.29 0.01 5.31	0.05 0.22 0.80 0.46

Day, No. observations (n), Degrees of freedom (df)

model

Total biovolume

Chlorophyta colonies

Other flagellates

n = 18

df = 17

ANOVA

r²

0.02

-0.31

0.39^a

0.04

0.35^b

5.61

0.01

-0.38

0.08^b

9.73

n = 18

df = 17

ANOVA

r²

0.01

-0.35

0.07

0.20

0.18

1.84

0.01

-0.37

0.10

2.44

n = 13

df = 7

ANOVA

r²

0.84

0.00

0.41^a

0.06

0.44^b

4.81

0.86

0.00

0.47

1.02

n = 18

df = 17

ANOVA

r²

0.32

0.06

0.02

+0.29

0.01

5.31

0.05

0.22

0.80

0.46

Linear regression (lr) of the phytoplankton biovolume and One-Way-ANOVA (ANOVA) of the relative abundances against N fertilisation treatments. Normality and equal variance tests passed if not indicated. Significant results are shown in bold. The leading sign of slope for significant linear regression is indicated (+, -).

^aNormality test failed.

^bH-value (not normally distributed: Kruskal-Wallis ANOVA on Ranks).