Ecological Archives E089-150-A3

Aidan M. Keith, René van der Wal, Rob W. Brooker, Graham H. R. Osler, Stephen J. Chapman, David F. R. P. Burslem, and David A. Elston. 2008. Increasing litter species richness reduces variability in a terrestrial decomposer system. Ecology 89:2657–2664.

Appendix C. Full GLM summaries from analysis of litter species richness and composition after 196 and 564 days for mass loss, moisture, C:N ratio, microbial biomass, and nematode abundance.

TABLE C1. Full GLM summaries from analysis of litter species richness and composition after 196 and 564 days for mass loss, moisture, C:N ratio, microbial biomass and nematode abundance. The effects of litter species richness and composition were examined for each time separately since time was highly significant for all variables (Mass loss: F1, 230 = 1980.7, P < 0.0001, Moisture: F1, 230 = 653.3, P < 0.0001, C:N ratio: F1, 230 = 654.0, P < 0.0001, Microbial biomass: F1, 230 = 15.7, P < 0.0001, Nematode abundance: F1, 230 = 56.0, P < 0.0001).


196 days

564 days

df

SS

MS

F

P

SS

MS

F

P


Log mass loss (%)

Block

2

0.105

0.053

8.9

<0.001

0.108

0.054

8.4

<0.001

Species richness#

4

0.097

0.024

0.2

0.961

0.046

0.012

0.1

0.974

Species composition

26

4.187

0.161

27.4

<0.001

2.512

0.097

14.9

<0.001

Error

99

0.583

0.006

0.642

0.006

Total

131

4.971

3.309

Moisture (% litter dry mass)

Block

2

7517

3758

2.3

0.107

168232

84116

10.3

<0.001

Species richness#

4

13175

3294

0.1

0.979

70543

17636

1.4

0.277

Species composition

26

800269

30780

18.7

<0.001

338489

13019

1.6

0.053

Error

99

162889

1645

808787

8170

Total

131

983851

1386051

Log C:N ratio

Block

2

0.031

0.016

2.9

0.061

0.074

0.037

4.4

0.015

Species richness#

4

0.118

0.030

0.3

0.902

0.179

0.045

1.2

0.346

Species composition

26

2.965

0.114

21.0

<0.001

0.992

0.038

4.5

<0.001

Error

99

0.537

0.005

0.832

0.008

Total

131

3.650

2.078

Log microbial biomass (nmol/g litter dm)

Block

2

0.388

0.194

8.0

<0.001

0.082

0.041

2.2

0.114

Species richness#

4

2.982

0.746

3.4

0.024

0.055

0.014

0.3

0.856

Species composition

26

5.770

0.222

9.2

<0.001

1.089

0.042

2.3

0.002

Error

99

2.400

0.024

1.823

0.018

Total

131

3.049

Sqrt nematode abundance (Ind./g litter dm)

Block

2

34.80

17.401

2.6

0.071

9.03

4.517

0.7

0.494

Species richness#

4

21.57

5.393

0.9

0.494

43.59

10.898

1.9

0.150

Species composition

26

160.88

6.188

1.0

0.522

153.39

5.900

0.9

0.571

Error

99

635.19

6.416

629.95

6.363

Total

131

852.44

835.96


#Species richness term tested against Species composition to obtain appropriate F value.


[Back to E089-150]