*Ecological Archives* E096-250-A4

E. F. LoPresti, I. S. Pearse, and G. K. Charles. 2015. The siren song of a sticky plant: Columbines provision mutualist arthropods by attracting and killing passerby insects. *Ecology* 96:2862–2869. http://dx.doi.org/10.1890/15-0342.1

Appendix D. Predator and carrion numbers in a natural population.

*Methods*

To determine whether predators tracked carrion abundance in unmanipulated populations of columbine, on 5 and 6 July 2014, we scored all accessible peduncles (*n* = 187) in the same meadow as the attraction experiment for number of carrion and number and identity of predators. We analyzed the relationship between these counts using linear regression.

*Results*

Predators correlated positively with carrion abundance; a linear regression explained ~16% of the variance in total predator abundance (*r*² = 0.1641, *F* = 36.32, df = 1, 185, *p* < 0.001); predicting that an increase of ~65 pieces of carrion would result in one additional predator observed on a plant.

Fig. D1. A positive relationship between natural carrion and predator abundance. Solid line represents the linear regression predator abundance = 0.06 + 0.015*number of carrion. Dotted lines are predicted 95% confidence intervals.