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Table 2 Analysis of variance of effect of different plant proportions on grasshopper performance variables

From: Plant composition changes in a small-scale community have a large effect on the performance of an economically important grassland pest

Grasshopper performance

Community parameters

Df

Sum Sq

F value

Pr (> F)

Significance

Male mass

Total plant biomass

1

0.00081

0.119

0.734

 

PSk

1

0.00531

0.779

0.387

 

PLc

1

0.0323

3.838

0.060

.

PAf

1

0.0663

9.723

0.005

**

PSk: PLc

1

0.00951

1.395

0.250

 

PSk: PAf

1

0.00508

0.745

0.397

 

PAf: PLc

1

0.0007

0.102

0.752

 

PSk: PAf: PLc

1

0.0299

4.38

0.048

*

Residuals

22

0.15002

   

Male length

Total plant biomass

1

0.00003

0.045

0.833

 

PSk

1

0.00038

0.578

0.455

 

PLc

1

0.00130

1.863

0.183

 

PAf

1

0.00298

4.53

0.045

*

PSk: PLc

1

0.00051

0.78

0.387

 

PSk: PAf

1

0.00092

1.403

0.249

 

PAf: PLc

1

0.00112

1.707

0.205

 

PSk: PAf: PLc

1

0.00047

0.719

0.406

 

Residuals

22

0.014446

   

Female mass

Total plant biomass

1

0.0403

2.605

0.121

 

PSk

1

0.0985

6.363

0.019

*

PLc

1

0.0123

0.796

0.382

 

PAf

1

0.0640

4.106

0.0523

 

PSk: PLc

1

0.000

0.000

0.999

 

PSk: PAf

1

0.000

0.000

0.985

 

PAf: PLc

1

0.0086

0.558

0.463

 

PSk: PAf: PLc

1

0.0002

0.014

0.906

 

Residuals

22

0.341

   

Female length

Total plant biomass

1

0.00264

1.647

0.213

 

PSk

1

0.00002

0.015

0.904

 

PLc

1

0.00155

1.123

0.298

 

PAf

1

0.00131

0.817

0.376

 

PSk: PLc

1

0.00041

0.256

0.618

 

PSk: PAf

1

0.00017

0.103

0.751

 

PAf: PLc

1

0.00006

0.035

0.854

 

PSk: PAf: PLc

1

0.00048

0.298

0.591

 

Residuals

22

0.03523

   

Preference for Sk

Total plant biomass

1

0.04

1.19

0.287

 

PSk

1

8.151

241.24

2.43E − 13

***

PLc

1

0.104

3.071

0.0936

.

PAf

1

3.08

11.84

0.00184

**

PSk: PLc

1

0.267

7.9

0.010185

*

PSk: PAf

1

0.691

20.45

0.000169

***

PLc: PAf

1

0.001

0.015

0.9036

 

PSk: PLc: PAf

1

0.369

10.919

0.0032

**

Residuals

22

0.743

   

Preference for Lc

Total plant biomass

1

0.16

7.026

0.0146

*

PSk

1

0.763

33.42

8.14E−06

***

PLc

1

3.245

142.15

4.5E−11

***

PAf

1

1.153

7.464

0.011

*

PSk: PLc

1

0.301

13.20

0.001

**

PSk: PAf

1

0.45

19.72

0.0002

***

PLc: PAf

1

0.012

0.505

0.485

 

PSk: PLc: PAf

1

0.042

1.828

0.190

 

Residuals

22

0.502

   

Preference for Af

Total plant biomass

1

0

0

0.999739

 

PSk

1

0.138

13.80

0.00121

**

PLc

1

0.191

19.21

0.00024

***

PAf

1

0.321

35.51

2.04E−06

***

PSk: PLc

1

0.020

1.964

0.175

 

PSk: PAf

1

0.00106

0.107

0.747

 

PLc: PAf

1

0.00218

0.219

0.645

 

PSk: PLc: PAf

1

0.00281

0.282

0.601

 

Residuals

22

0.21926

   
  1. PSk, PLc, PAf represent the proportion of S. krylovii, L. chinensis, and A. frigida in the community
  2. Sk: S. krylovii; Lc: L. chinensis; Af: A. frigida
  3. Statistical significance: ‘***’, 0.001; ‘**’, 0.01; ‘*’, 0.05; ‘.’, 0.1; ‘ ’, 1