Indirect interactions among tropical tree species through shared rodent seed predators: a novel mechanism of tree species coexistence

Carol X Garzon-Lopez, Liliana Ballesteros-Mejia, Alejandro Ordoñez, Stephanie A Bohlman, Han Olff, Patrick A Jansen

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The coexistence of numerous tree species in tropical forests is commonly explained by negative dependence of recruitment on the conspecific seed and tree density due to specialist natural enemies that attack seeds and seedlings ('Janzen-Connell' effects). Less known is whether guilds of shared seed predators can induce a negative dependence of recruitment on the density of different species of the same plant functional group. We studied 54 plots in tropical forest on Barro Colorado Island, Panama, with contrasting mature tree densities of three coexisting large seeded tree species with shared seed predators. Levels of seed predation were far better explained by incorporating seed densities of all three focal species than by conspecific seed density alone. Both positive and negative density dependencies were observed for different species combinations. Thus, indirect interactions via shared seed predators can either promote or reduce the coexistence of different plant functional groups in tropical forest.

Original languageEnglish
Pages (from-to)752-760
Number of pages9
JournalEcology Letters
Volume18
Issue number8
Early online date04 May 2015
DOIs
Publication statusPublished - Aug 2015
Externally publishedYes

Keywords

  • Animals
  • Ecosystem
  • Herbivory
  • Logistic Models
  • Panama
  • Rodentia
  • Seeds
  • Trees
  • Tropical Climate
  • Journal Article
  • Research Support, Non-U.S. Gov't

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