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Table 2 Percentages (mean ± SD) of densities of dominant taxa and values (mean ± SD) of phytoplankton indicators (diversity) at seven sampling sites from January to December of 2015 in Tai Lake

From: Factors associated with blooms of cyanobacteria in a large shallow lake, China

Items

TH1

TH2

TH3

TH4

TH5

TH6

TH7

P

P Cyanophyta %

76.2 ± 23.3

87.3 ± 19.7

86.8 ± 16.4

96.2 ± 3.5

69.5 ± 24.0

85.2 ± 20.0

55.4 ± 37.5

**

P Chlorophyta %

18.9 ± 21.6

6.1 ± 9.4

11.0 ± 16.0

2.3 ± 2.4

25.5 ± 21.4

9.2 ± 13.3

17.3 ± 25.5

*

P Bacillariophyta %

3.7 ± 3.1

5.7 ± 9.4

1.7 ± 1.6

1.2 ± 1.4

3.6 ± 3.4

4.7 ± 7.1

22.5 ± 28.8

*

P Cryptophyta %

1.1 ± 0.9

0.8 ± 1.6

0.4 ± 0.3

0.3 ± 0.2

1.3 ± 0.7

0.8 ± 1.3

4.5 ± 8.5

**

P Microcystis sp. %

50.3 ± 32.8

63.0 ± 35.3

45.1 ± 32.8

65.9 ± 36.5

40.7 ± 29.1

56.9 ± 34.7

44.0 ± 34.0

n.s.

P Anabaena flos-aquae %

18.2 ± 18.7

18.4 ± 21.0

26.6 ± 24.8

26.6 ± 33.0

24.3 ± 23.6

15.3 ± 20.7

1.8 ± 3.6

*

P Planctonema sp. %

18.9 ± 21.6

6.1 ± 9.4

11.0 ± 16.0

2.3 ± 2.4

25.5 ± 21.4

9.2 ± 13.3

17.3 ± 25.5

**

P Melosira sp. %

1.4 ± 2.2

1.6 ± 2.2

1.1 ± 1.3

0.6 ± 0.8

2.3 ± 2.8

0.6 ± 0.9

1.3 ± 2.9

n.s.

Taxa-S

14 ± 2

15 ± 6

19 ± 8

15 ± 4

15 ± 4

17 ± 5

14 ± 3

n.s.

D s

0.51 ± 0.25

0.39 ± 0.26

0.53 ± 0.24

0.27 ± 0.22

0.57 ± 0.16

0.46 ± 0.26

0.52 ± 0.21

n.s.

H′

1.14 ± 0.55

0.89 ± 0.58

1.21 ± 0.62

0.61 ± 0.46

1.28 ± 0.43

1.11 ± 0.69

1.24 ± 0.50

*

J

0.26 ± 0.12

0.20 ± 0.11

0.22 ± 0.11

0.14 ± 0.07

0.26 ± 0.09

0.21 ± 0.11

0.29 ± 0.13

*

D b

0.23 ± 0.16

0.17 ± 0.17

0.25 ± 0.17

0.10 ± 0.10

0.26 ± 0.15

0.24 ± 0.24

0.21 ± 0.14

n.s.

  1. P Cyanophyta: percent of Cyanophyta density among the phytoplankton community; P Chlorophyta: percent of Chlorophyta density among the phytoplankton community; P Bacillariophyta: percent of Bacillariophyta density among the phytoplankton community; P Cryptophyta: percent of Cryptophyta density among the phytoplankton community; P Microcystis sp.: percent of Microcystis sp. density among the phytoplankton community
  2. * p < 0.05; ** p < 0.005; n.s not significant