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Phenotypic variation in nurse traits and community feedbacks define an alpine community
Author(s) -
Michalet Richard,
Xiao Sa,
Touzard Blaise,
Smith David S.,
Cavieres Lohengrin A.,
Callaway Ragan M.,
Whitham Thomas G.
Publication year - 2011
Publication title -
ecology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.852
H-Index - 265
eISSN - 1461-0248
pISSN - 1461-023X
DOI - 10.1111/j.1461-0248.2011.01605.x
Subject(s) - biology , facilitation , foundation species , ecology , phenotype , biodiversity , neuroscience , gene , biochemistry
Ecology Letters (2011) 14: 433–443 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.