Phenotypic variation in nurse traits and community feedbacks define an alpine community

Richard Michalet, Sa Xiao, Blaise Touzard, David S. Smith, Lohengrin A. Cavieres, Ragan M. Callaway, Thomas G. Whitham

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

Much is known about facilitation, but virtually nothing about the underlying genetic and evolutionary consequences of this important interaction. We assessed the potential of phenotypic differences in facilitative effects of a foundation species to determine the composition of an Alpine community in Arizona. Two phenotypes of Geum rossii occur along a gradient of disturbance, with 'tight' competitive cushions in stable conditions and 'loose' facilitative cushions in disturbed conditions. A common-garden study suggested that field-based traits may have a genetic basis. Field experiments showed that the reproductive fitness of G. rossii cushions decreased with increasing facilitation. Finally, using a dual-lattice model we showed that including the cost and benefit of facilitation may contribute to the co-occurrence of genotypes with contrasting facilitative effects. Our results indicate that changes in community composition due to phenotypic differences in facilitative effects of a foundation species may in turn affect selective pressures on the foundation species.

Original languageEnglish (US)
Pages (from-to)433-443
Number of pages11
JournalEcology Letters
Volume14
Issue number5
DOIs
StatePublished - May 1 2011

Keywords

  • Common-garden experiment
  • Community feedbacks
  • Community genetics
  • Cost of facilitation
  • Dual-lattice model
  • Facilitation
  • Foundation species
  • Physical disturbance

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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