Ecological Archives E085-063-A8

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 H. Stepwise multiple regression with backwards removal for the effects of plant resistance traits (cardenolides, latex production, trichome density, and leaf toughness) and leaf nitrogen, plant height and percentage flowering on abundance of Tetraopes adults. The analysis is based on the family means for 23 full-sibs of Asclepias syriaca grown in a common garden.

Effect

R2

Coefficient

Standard Error

t

P

           

Percentage flowering

0.099

1.586

0.499

3.179

0.005

Trichome density

0.084

-0.008

0.003

-2.938

0.009

Maximum height

0.083

0.080

0.028

2.920

0.010

Nitrogen

0.060

-1.030

-0.414

-2.488

0.023

Latex volume

0.052

-0.245

0.106

-2.305

0.034


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