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Testing the trait‐based community framework: Do functional traits predict competitive outcomes?
Author(s) -
Funk Jennifer L.,
Wolf Amelia A.
Publication year - 2016
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.1002/ecy.1484
Subject(s) - biology , trait , coexistence theory , ecology , competition (biology) , range (aeronautics) , niche , invasive species , limiting , specific leaf area , phylogenetic tree , botany , computer science , mechanical engineering , biochemistry , materials science , photosynthesis , gene , engineering , composite material , programming language
Abstract Plant traits can be used to understand a range of ecological processes, including competition with invasive species. The extent to which native and invasive species are competing via limiting similarity or trait hierarchies has important implications for the management of invaded communities. We screened 47 native species that co‐occur with Festuca perennis , a dominant invader in California serpentine grassland, for traits pertaining to resource use and acquisition. We then grew F. perennis with 10 species spanning a range of functional similarity in pairwise competition trials. Functionally similar species did not have a strong adverse effect on F. perennis performance as would be expected by limiting similarity theory. Phylogenetic relatedness, which may integrate a number of functional traits, was also a poor predictor of competitive outcome. Instead, species with high specific root length, low root‐to‐shoot biomass ratio, and low leaf nitrogen concentration were more effective at suppressing the growth of F. perennis . Our results suggest that fitness differences (i.e., trait hierarchies) may be more important than niche differences (i.e., limiting similarity) in structuring competitive outcomes in this system and may be a promising approach for the restoration of invaded systems.