Ecological Archives E090-241-A3

Ian Donohue, Andrew L. Jackson, Martin T. Pusch, and Kenneth Irvine. 2009. Nutrient enrichment homogenizes lake benthic assemblages at local and regional scales. Ecology 90:3470–3477.

Appendix C. Results of PERMANOVA analyses examining the effects of lake alkalinity and trophic status on the relative variability of the spatial distances among lakes sampled for (a) littoral and (b) profundal/sub-littoral invertebrates.

 

Source

df

Sum of squares

Mean square

Pseudo-F

P

(a)

Alkalinity

2

7.19 × 109

3.59 × 109

1.94

0.16

 

Trophic status

1

2.93 × 108

2.93 × 108

0.16

0.7

 

Alk × TS

2

7.1 × 109

3.55 × 109

1.92

0.15

 

Residual

34

6.29 × 1010

1.85 × 109

 

 

 

Total

39

8.91 × 1010

 

 

 

(b)

Alkalinity

2

2.51 × 109

1.25 × 109

0.82

0.43

 

Trophic status

1

2.86 × 107

2.86 × 107

0.01

0.89

 

Alk × TS

2

6.88 × 109

3.44 × 109

2.25

0.11

 

Residual

46

7.02 × 1010

1.53 × 109

 

 

 

Total

51

7.84 × 1010

 

 

 


[Back to E090-241]