Multitrait successional forest dynamics enable diverse competitive coexistence

Daniel S. Falster, Åke Brännström, Mark Westoby, Ulf Dieckmann

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

To explain diversity in forests, niche theory must show how multiple plant species coexist while competing for the same resources. Although successional processes are widespread in forests, theoretical work has suggested that differentiation in successional strategy allows only a few species stably to coexist, including only a single shade tolerant. However, this conclusion is based on current niche models, which encode a very simplified view of plant communities, suggesting that the potential for niche differentiation has remained unexplored. Here, we show how extending successional niche models to include features common to all vegetation—height-structured competition for light under a prevailing disturbance regime and two trait-mediated tradeoffs in plant function—enhances the diversity of species that can be maintained, including a diversity of shade tolerants. We identify two distinct axes of potential niche differentiation, corresponding to the traits leaf mass per unit leaf area and height at maturation. The first axis allows for coexistence of different shade tolerances and the second axis for coexistence among species with the same shade tolerance. Addition of this second axis leads to communities with a high diversity of shade tolerants. Niche differentiation along the second axis also generates regions of trait space wherein fitness is almost equalized, an outcome we term “evolutionarily emergent near-neutrality.” For different environmental conditions, our model predicts diverse vegetation types and trait mixtures, akin to observations. These results indicate that the outcomes of successional niche differentiation are richer than previously thought and potentially account for mixtures of traits and species observed in forests worldwide.
Original languageEnglish
Pages (from-to)E2719-E2728
Number of pages10
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number13
DOIs
Publication statusPublished - 28 Mar 2017

Keywords

  • niche
  • coexistence
  • trait
  • plant
  • adaptive dynamics
  • Plant
  • Adaptive dynamics
  • Niche
  • Coexistence
  • Trait

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