The storage effect due to frequency-dependent predation in multispecies plant communities.
Frequency-dependent seed predation (FDP) has been shown to be a powerful coexistence mechanism in models of annual plant communities. However, FDP undermines the competition-based coexistence mechanism called the storage effect (SEc), which relies on temporal environmental fluctuations that drive fluctuations in competition. Although environmental fluctuations also drive fluctuations in predation, a storage effect due to predation (SEp) may not arise due to a time lag between a change in the environment and the resulting change in the predation rate. Here we show how SEp can arise with multispecies FDP, and in a two-species setting with density-dependent frequency-dependence, partially compensating for the reduction in SEc, in the presence of predation. These outcomes occur when predatory behavior is flexible, and can accommodate to changes in prey abundances on a within-year time scale, leading to changes in predator preferences in response to prey abundances in a given year. When predator preferences are determined by average prey abundances over several years, FDP is still a strong coexistence mechanism but undermines SEc without creating SEp.
Chesson
Peter
P
Department of Ecology and Evolution Biology, University of Arizona, Tucson, AZ 85721, United States. pchesson@u.arizona.edu
Kuang
Jessica J
JJ
D000818:Animals; D044822:Biodiversity; D003163:Competitive Behavior; D020387:Food Chain; D008954:Models, Biological; D063245:Plant Development; D018521:Plant Physiological Phenomena; D011235:Predatory Behavior; D012639:Seeds / Q000254:growth & development*