Ecological Archives E096-217-A2

Alexander Wacker, Vanessa Marzetz, and Elly Spijkerman. 2015. Interspecific competition in phytoplankton drives the availability of essential mineral and biochemical nutrients. Ecology 96:2467–2477. http://dx.doi.org/10.1890/14-1915.1

Appendix B. Results of statistical comparisons between predicted and observed C:P ratios and concentrations of fatty acids in the three different phytoplankton assemblages.

Table B1. Results of statistical comparisons (ANOVA) between predicted and observed C:P ratios and concentrations of fatty acids in the three different phytoplankton assemblages (C1–C3), which differed in the Pi concentration of the pre-culture; Pi-replete (P+/P-) and Pi-limited (P-/P-). Symbols after p values indicate the direction of an effect; [+] indicates significantly higher and [–] lower observed values than predicted.

 

 

 

 

C1

 

 

 

C2

 

 

 

C3

 

 

Pre-/culture

df

F

p

 

 

F

p

 

 

F

p

 

C:P

P+/P-

1,4

11.6

0.027

+

2.0

0.23

16.3

0.016

+

P-/P-

1,4

566.9

<0.001

+

3.35

0.14

41.6

0.003

+

SFA

P+/P-

1,4

5.81

0.074

161.6

<0.001

–

0.39

0.56

P-/P-

1,4

19.0

0.012

–

675.6

<0.001

–

6.36

0.065

HTA

P+/P-

1,4

4.94

0.09

22.6

0.009

–

4.56

0.10

P-/P-

1,4

19.1

0.011

–

65.8

0.001

–

78.9

<0.001

–

Oleic acid

P+/P-

1,4

173.5

<0.001

+

49.9

0.002

+

508.4

<0.001

+

P-/P-

1,4

36.1

0.004

+

52

0.002

+

83.5

<0.001

+

LIN

P+/P-

1,4

78.2

<0.001

+

46.7

0.002

+

49.0

0.002

+

P-/P-

1,4

5.66

0.076

0.01

0.91

5.23

0.084

ALA

P+/P-

1,4

1.89

0.24

5.28

0.08

0.74

0.44

P-/P-

1,4

42.1

0.003

–

60.1

0.001

–

20.7

0.01

–

ARA

P+/P-

1,4

3.63

0.13

298.1

<0.001

+

2.16

0.22

P-/P-

1,4

3.49

0.13

7.33

0.054

8.39

0.044

+

EPA

P+/P-

1,4

286

<0.001

+

220.5

<0.001

+

383.6

<0.001

+

 

P-/P-

1,4

9.19

0.039

+

9.17

0.039

+

0.55

0.50

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