Emerged or imposed: A theory on the role of physical templates and self-organisation for vegetation patchiness

Efrat Sheffer, Jost von Hardenberg, Hezi Yizhaq, Moshe Shachak, Ehud Meron

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

In this article, we develop a unifying framework for the understanding of spatial vegetation patterns in heterogeneous landscapes. While much recent research has focused on self-organised vegetation the prevailing view is still that biological patchiness is mostly due to top-down control by the physical landscape template, disturbances or predators. We suggest that vegetation patchiness in real landscapes is controlled both by the physical template and by self-organisation simultaneously, and introduce a conceptual model for the relative roles of the two mechanisms. The model considers four factors that control whether vegetation patchiness is emerged or imposed: soil patch size, plant size, resource input and resource availability. The last three factors determine the plant-patch size, and the plant-to-soil patch size ratio determines the impact of self-organisation, which becomes important when this ratio is sufficiently small. A field study and numerical simulations of a mathematical model support the conceptual model and give further insight by providing examples of self-organised and template-controlled vegetation patterns co-occurring in the same landscape. We conclude that real landscapes are generally mixtures of template-induced and self-organised patchiness. Patchiness variability increases due to source-sink resource relations, and decreases for species of larger patch sizes.

Original languageEnglish
Pages (from-to)127-139
Number of pages13
JournalEcology Letters
Volume16
Issue number2
DOIs
StatePublished - 1 Feb 2013

Keywords

  • Drylands
  • Landscape
  • Patch size
  • Patchiness
  • Poa bulbosa L
  • Scale
  • Self-organisation
  • Template induced
  • Vegetation pattern formation

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