Ecological Archives E085-063-A7

Anurag A. Agrawal. 2004. Resistance and susceptibility of milkweed to herbivore attack: consequences of competition, root herbivory, and plant genetic variation. Ecology 85:2118–2133.

Appendix G. Multivatiate analyses followed by mixed-model univariate analyses for effects of grass competition, root herbivory by beetles, and full sibling family of milkweed on the natural log of final fruit production, mass per fruit, and vegetative biomass at the end of the second growing season. The likelihood-ratio test was used for the random effect (Family). Denominator degrees of freedom for the univariate fixed effects ranges from 116 to 121 and were determined by the Satterthwaite approximation.

 
MANOVA
Fruits
Fruit mass
Biomass
 

Wilks' lambda

df

F

P

F

P

F

P

F

P

Grass

0.962

3, 116

1.53

0.210

 

3.06

0.083

 

3.58

0.061

 

1.69

0.196

Beetle

0.867

3, 116

5.94

<0.001

 

8.01

<0.001

 

13.44

<0.001

 

13.53

<0.001

Grass × Beetle

0.971

3, 116

1.12

0.345

 

0.02

0.875

 

1.91

0.169

 

0.43

0.514

Family

0.580

39, 344

1.78

0.004

1.1

 

0.147

1.5

 

0.110

0

 

0.5


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