Shifts in the regeneration niche of an endangered tree (Acer opalus ssp. granatense) during ontogeny: Using an ecological concept for application

J.L. Quero Perez, L. Gómez-Aparicio, R. Zamora, F.T. Maestre

Research output: Contribution to journalArticleAcademicpeer-review

57 Citations (Scopus)

Abstract

Most of our knowledge regarding ontogenetic niche shifts in plants has been derived from studies involving only two or unconnected life stages. Approaches covering a broader range of different life stages are still needed to fully understand the implications of ontogenetic niche shifts for plant regeneration dynamics. We investigated ontogenetic shifts in the endangered Mediterranean tree species Acer opalus ssp. granatense (A. opalus) comparing the environmental characteristics of individuals of different ages with those of a random sample of available microsites. In addition, since herbivory could be a limiting factor, herbivory damage was quantified. Differences in environmental characteristics between locations of individual plants and randomly selected points became larger with plant age, suggesting that the regeneration niche of A. opalus shifts during ontogeny, undergoing a contraction. The presence of shrubs and adult trees, the depth of the litter layer, and herbivory were the main factors influencing these changes. A. opalus can germinate in all available microhabitats its seeds can reach, but saplings establish and grow only in a subset of microhabitats, which represent a change in tolerance to extrinsic factors. Old saplings establish under the canopy of shrubs, far away from tree cover that could block light required in the oldest stage. Therefore, temporal changes in the nature and strength of plant¿plant interactions are also occurring. The ecological concept of niche shifts reveals the microsites with higher probabilities of long-term sapling survival of A. opalus: shrub cover involves an array of environmental changes crucial for the successful establishment of A. opalus saplings under stressful Mediterranean conditions, from microhabitat amelioration to herbivory protection.
Original languageEnglish
Pages (from-to)635-644
JournalBasic and Applied Ecology
Volume9
Issue number6
DOIs
Publication statusPublished - 2008

Keywords

  • seedling establishment
  • nurse plants
  • pinus-halepensis
  • shrubs
  • facilitation
  • forest
  • recruitment
  • competition
  • patterns
  • growth

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