Ecological Archives E085-063-A3

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

Appendix C. Mixed-model analysis of variance table for effects of grass competition, root herbivory by beetles, and full sibling family of milkweed on production of latex, cardenolides, and leaf carbon and nitrogen concentrations near the end of the second growing season. The likelihood-ratio test was used for the random effect (Family). Denominator degrees of freedom ranged between 110 to 127 and were determined by the Satterthwaite approximation.

 
Latex
 
Cardenolides
 
Carbon
 
Nitrogen
 

F

P

 

F

P

 

F

P

 

F

P

Grass

 

0.65

0.422

 
 

0.18

0.675

 
 

0.02

0.882

 
 

0.81

0.369

Beetle

 

0.71

0.402

 
 

0.17

0.683

 
 

2.03

0.156

 
 

1.17

0.281

Grass × Beetle

 

0.13

0.722

 
 

0.23

0.635

 
 

1.69

0.196

 
 

4.45

0.037

Family

9.4

 

<0.001

 

0

 

0.5

 
 

0

0.5

 

9.0

 

<0.001


[Back to E085-063]