Ecological Archives E090-169-A1

Sergio Rasmann, Anurag A. Agrawal, Susan C. Cook, and Alexis C. Erwin. 2009. Cardenolides, induced responses, and interactions between above- and belowground herbivores of milkweed (Asclepias spp.). Ecology 90:2393–2404.

Appendix A. Three-way ANOVAs (and separate and two-way analyses on root and shoot data independently) for effects of species and monarch herbivory on cardenolides of 12 Asclepias species.

Analysis

Source

df

F ratio

P value

Root and shoot

plant part (P)

1, 170

216.735

<0.0001

 

treatment (T)

1, 170

11.363

0.0009

 

species (S)

11, 170

16.641

<0.0001

 

P × T

1, 170

11.031

0.001

 

P × S

11, 170

13.573

<0.0001

 

T × S

11, 170

2.939

0.001

 

P × T × S

11, 170

2.741

0.003

Root analysis

T

1, 84

0.035

0.853

 

S

11, 84

4.613

<0.0001

 

T × S

11, 84

0.54

0.871

Shoot analysis

T

1, 84

11.579

0.001

 

S

11, 84

15.573

<0.0001

 

T × S

11, 84

2.895

0.003


[Back to E090-169]