Supplementary Information
Measurements of stickiness and other plant traits
Stickiness was ranked between 0 and 5 based on natural variation: 0 = no viscid trichomes, 1 = scarce viscid
trichomes on buds and none or virtually none on stems, 2 = scarce but consistent viscid trichomes on buds and
stems, 3 = dense viscid trichomes on buds and stems, and scarcely on leaves, 4 = dense viscid trichomes on buds,
stems and leaves, and 5 = buds, stems and leaves completely covered in dense viscid trichomes. Plant size was
estimated on July 27 as the product of plant height and its two longest horizontal axes. The number of dehisced
fruits per plant was assessed weekly from July 15 through the end of the season.
Analyses
For events that reached a maximum at a particular time-point for each plant, such as number of fruits
produced and caterpillar-chewed buds, we used the maximum weekly observation as our season-wide estimate. For
events that persisted between observation time points, i.e. P. spinocollis egg abundance, H. echinatus eggs, carrion
abundance, and plant viscid trichome density, we plotted the values for each observation over the season and
estimated the area under the curve as our season-wide estimate (e.g. ‘egg-days’ (Southwood 1966)). For
observations of mobile insects such as H. echinatus nymphs, spiders, and J. wickhami nymphs, we used the sum of
observations as our season-wide estimate.
Treatment effects from the two experiments (carrion addition and caterpillar addition) were analyzed using
variations of generalized linear regression. In the carrion addition experiment, we also analyzed the connection
between density of plant glandular trichomes and natural carrion accumulation. In addition, within the control group
of the carrion addition experiment, we analyzed the relationship between naturally occurring carrion and P.
spinocollis egg abundance. We estimated the effect of carrion addition on predator abundance and herbivore
damage using a generalized linear model with a negative binomial distribution. We analyzed the effects on plant
fitness using a linear model on square-root transformed fruit counts. In the carrion addition experiment, we included
plant size as a covariate in models of plant bud damage and fruit set. We also included plant size as a covariate in
our regression of natural carrion accumulation on plant glandular trichome density. We included block as a
predictor variable in the caterpillar-addition experiment because of the paired design. All statistics were calculated
in R using the package car (R Core Development Team 2008,Weisberg & Fox 2010).