title: Genetic sorting of subordinate species in grassland modulated by intraspecific variation in dominant species.
abstract: Genetic variation in a single species can have predictable and heritable effects on associated communities and ecosystem processes, however little is known about how genetic variation of a dominant species affects plant community assembly. We characterized the genetic structure of a dominant grass (Sorghastrum nutans) and two subordinate species (Chamaecrista fasciculata, Silphium integrifolium), during the third growing season in grassland communities established with genetically distinct (cultivated varieties or local ecotypes) seed sources of the dominant grasses. There were genetic differences between subordinate species growing in the cultivar versus local ecotype communities, indicating that intraspecific genetic variation in the dominant grasses affected the genetic composition of subordinate species during community assembly. A positive association between genetic diversity of S. nutans, C. fasciculata, and S. integrifolium and species diversity established the role of an intraspecific biotic filter during community assembly. Our results show that intraspecific variation in dominant species can significantly modulate the genetic composition of subordinate species.
authors.affiliation: Department of Biology, The Citadel, Charleston, South Carolina, United States of America.
authors.forename: Danny J
authors.initials: DJ
authors.lastname: Gustafson
authors.affiliation: Department of Biology, The Citadel, Charleston, South Carolina, United States of America.
authors.forename: Charles
authors.initials: C
authors.lastname: Major
authors.affiliation: Department of Biology, The Citadel, Charleston, South Carolina, United States of America.
authors.forename: Dewitt
authors.initials: D
authors.lastname: Jones
authors.affiliation: Department of Biology, The Citadel, Charleston, South Carolina, United States of America.
authors.forename: John
authors.initials: J
authors.lastname: Synovec
authors.affiliation: Department of Plant Biology and Center for Ecology, Southern Illinois University Carbondale, Carbondale, Illinois, United States of America.
authors.forename: Sara G
authors.initials: SG
authors.lastname: Baer
authors.affiliation: Department of Plant Biology and Center for Ecology, Southern Illinois University Carbondale, Carbondale, Illinois, United States of America.
authors.forename: David J
authors.initials: DJ
authors.lastname: Gibson
mesh_terms: D044822:Biodiversity; D018744:DNA, Plant; D017753:Ecosystem; D014644:Genetic Variation; D065948:Grassland; D006109:Poaceae / Q000235:genetics*
chemical_list: D018744:DNA, Plant