Ecological Archives E085-068-A1

Spencer R. Hall, Mathew A. Leibold, David A. Lytle, and Val H. Smith. 2004. Stoichiometry and planktonic grazer composition over gradients of light, nutrients, and predation risk. Ecology 85:2291–2301.

Appendix A. Results of nonparametric, univariate ANOVA analyses of edible seston C, P, and C:P ratio.

   

Edible Carbon (g C/L)

  

Edible Phosphorus (g P/L)

  

Edible C:P Ratio (mass)

Effect

df

SS

F

P

  

SS

F

P

  

SS

F

P

R

2

7E-07

0.12

0.88

  

1.05E-02

0.769

0.47

  

4.03E-03

3.58

0.0354

S

1

3.5E-06

1.22

0.27

  

2.66E-01

39.024

<0.0001

  

2.17E-02

38.46

<0.0001

L

1

4.1E-05

14.34

0.0001

  

5.95E-03

0.874

0.36

  

2.44E-02

43.26

<0.0001

T

1

7.7E-06

2.68

0.11

  

3.93E-02

5.775

0.0194

  

3.78E-04

0.67

0.42

R  ×  S

2

1.7E-06

0.30

0.75

  

2.62E-03

0.192

0.82

  

2.21E-03

1.96

0.15

R  ×  L

2

4E-06

0.70

0.51

  

2.35E-02

1.727

0.20

  

8.61E-04

0.76

0.48

R  ×  T

2

5.9E-06

1.02

0.37

  

1.01E-02

0.741

0.48

  

1.76E-04

0.16

0.86

S  ×  L

1

1.3E-06

0.46

0.54

  

1.80E-03

0.264

0.60

  

1.91E-03

3.39

0.071

S  ×  T

1

1E-08

0.00

0.96

  

1.45E-03

0.213

0.64

  

3.00E-06

0.01

0.93

L  ×  T

1

7.6E-07

0.27

0.62

  

1.03E-02

1.516

0.22

  

6.49E-04

1.15

0.29

R  ×  S  ×  L

2

5.7E-06

0.99

0.38

  

1.41E-02

1.033

0.36

  

2.31E-04

0.20

0.82

R  ×  S  ×  T

2

2.5E-06

0.43

0.66

  

4.79E-03

0.351

0.71

  

1.40E-03

1.24

0.29

R  ×  L  ×  T

2

2.2E-06

0.38

0.69

  

7.09E-03

0.521

0.60

  

2.87E-03

2.54

0.093

S  ×  L  ×  T

1

8E-08

0.03

0.87

  

8.70E-03

1.277

0.27

  

3.30E-05

0.06

0.81

R  ×  S   ×  L  × T

2

1.4E-05

2.49

0.096

  

4.68E-02

3.435

0.041

  

1.48E-04

0.13

0.88

Residual

48

1.38E-04

      

3.27E-01

      

2.71E-02

    

Total

23

2.29E-04

      

7.80E-01

      

8.80E-02

    

   Notes: Coefficients used in the Taylor (1961) transformations were b = 3.89, 2.85, and 3.24 for C, P, and C:P, respectively. P values were calculated based on 9,999 randomizations, where bolded values indicate significance at  = 0.0167 (0.05/3, Bonferroni corrected). Treatments include nutrient ratio (R, three levels), nutrient supply (S, two levels), light (L, two levels), and trophic structure (T, two levels). 

Literature cited

Taylor, L. R. 1961. Aggregation, variance, and the mean. Nature 187:732–735.


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