Spatial Dynamics of Specialist Seed Predators on Synchronized and Intermittent Seed Production of Host Plants

Akiko Satake, Ottar N. Bjørnstad

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Masting, the synchronized and intermittent seed production by plant populations, provides highly variable food resources for specialist seed predators. Such a reproductive mode helps minimize seed losses through predator satiation and extinction of seed predator populations. The seed predators can buffer the resource variation through dispersal or extended diapause. We developed a spatially explicit resource-consumer model to understand the effect of masting on specialist seed predators. The masting dynamics were assumed to follow a resource-based model for plant reproduction, and the population dynamics of the predator were represented by a spatially extended Nicholson-Bailey model. The resultant model demonstrated that when host plants reproduce intermittently, seed predator populations go locally extinct, but global persistence of the predator is facilitated by dispersal or extended diapause. Global extinction of the predator resulted when the intermittent reproduction is highly synchronized among plants. An approximate invasion criterion for the predators showed that negative lag-1 autocorrelation in seeding reduces invasibility, and positive lag-1 cross-correlation enhances invasibility. Spatial synchronization in seeding at local scale caused by pollen coupling (or climate forcing) further prevented invasion of the predators. If the predators employed extended diapause, extremely high temporal variability in reproduction was required for plants to evade the predators.

Original languageEnglish
Pages (from-to)591-605
Number of pages15
JournalAmerican Naturalist
Volume163
Issue number4
DOIs
Publication statusPublished - Apr 1 2004

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seed productivity
seed production
host plant
host plants
predator
seed
predators
seeds
masting
diapause
invasibility
resource
seeding
extinction
sowing
plant reproduction
climate forcing
satiety
autocorrelation

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

Cite this

Spatial Dynamics of Specialist Seed Predators on Synchronized and Intermittent Seed Production of Host Plants. / Satake, Akiko; Bjørnstad, Ottar N.

In: American Naturalist, Vol. 163, No. 4, 01.04.2004, p. 591-605.

Research output: Contribution to journalArticle

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