Ecological Archives A025-076-A2

Jared J. Beck, Daniel L. Hernández, Jae R. Pasari, and Erika S. Zavaleta. 2015. Grazing maintains native plant diversity and promotes community stability in an annual grassland. Ecological Applications 25:1259–1270. http://dx.doi.org/10.1890/14-1093.1

Appendix B. Linear mixed-effects model results for time series analysis of community composition.

Table B1. LME model results for time series analysis of community composition. The F statistic, degrees of freedom, and P value for each test are provided. Native plant richness was log-transformed.

Community metric

Experiment 1

 

Experiment 2

Treatment

F

df

P

 

F

df

P

Total grass cover

 

 

 

 

 

 

 

Grazing

14.398

1,4

0.019

 

0.222

1,4

0.662

Fertilization

0.641

1,8

0.446

 

0.026

1,8

0.877

Year

8.750

5,80

<0.001

 

8.085

3,48

<0.001

Grazing × Fertilization

0.392

1,8

0.549

 

0.422

1,8

0.534

Grazing × Year

2.926

5,80

0.018

 

0.514

3,48

0.675

Fertilization × Year

0.413

5,80

0.839

 

0.484

3,48

0.695

Grazing × Fertilization × Year

0.105

5,80

0.991

 

1.030

3,48

0.388

Native forb cover

 

 

 

 

 

 

 

Grazing

0.106

1,4

0.761

 

0.502

1,4

0.518

Fertilization

0.089

1,8

0.773

 

0.541

1,8

0.483

Year

14.180

5,80

<0.001

 

20.829

3,48

<0.001

Grazing × Fertilization

0.024

1,8

0.882

 

0.554

1,8

0.478

Grazing × Year

3.875

5,80

0.003

 

5.485

3,48

0.003

Fertilization × Year

0.534

5,80

0.750

 

0.009

3,48

0.999

Grazing × Fertilization × Year

0.518

5,80

0.762

 

0.685

3,48

0.565

Native plant diversity (H’)

 

 

 

 

 

 

 

Grazing

14.446

1,4

0.019

 

0.080

1,4

0.792

Fertilization

4.598

1,8

0.064

 

0.117

1,8

0.741

Year

3.857

5,80

0.004

 

2.388

3,48

0.080

Grazing × Fertilization

0.724

1,8

0.420

 

0.742

1,8

0.414

Grazing × Year

0.892

5,80

0.491

 

0.708

3,48

0.552

Fertilization × Year

0.697

5,80

0.627

 

1.079

3,48

0.367

Grazing × Fertilization × Year

0.459

5,80

0.806

 

1.104

3,48

0.357

Native plant richness

 

 

 

 

 

 

 

Grazing

2.439

1,4

0.193

 

0.012

1,4

0.919

Fertilization

11.442

1,8

0.010

 

0.676

1,8

0.435

Year

14.584

5,80

<0.001

 

3.067

3,48

0.037

Grazing × Fertilization

2.374

1,8

0.162

 

2.771

1,8

0.135

Grazing × Year

3.458

5,80

0.007

 

1.038

3,48

0.384

Fertilization × Year

1.562

5,80

0.180

 

0.533

3,48

0.662

Grazing × Fertilization × Year

0.456

5,80

0.808

 

0.730

3,48

0.539

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