Skip to Main Content
Granivory of invasive, naturalized, and native plants in communities differentially susceptible to invasionAuthor(s): B. M. Connolly; D. E. Pearson; R. N. Mack
Source: Ecology. 95(7): 1759-1769.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
PDF: View PDF (393.95 KB)
DescriptionSeed predation is an important biotic filter that can influence abundance and spatial distributions of native species through differential effects on recruitment. This filter may also influence the relative abundance of nonnative plants within habitats and the communities' susceptibility to invasion via differences in granivore identity, abundance, and food preference. We evaluated the effect of postdispersal seed predators on the establishment of invasive, naturalized, and native species within and between adjacent forest and steppe communities of eastern Washington, USA that differ in severity of plant invasion. Seed removal from trays placed within guild-specific exclosures revealed that small mammals were the dominant seed predators in both forest and steppe. Seeds of invasive species (Bromus tectorum, Cirsium arvense) were removed significantly less than the seeds of native (Pseudoroegneria spicata, Balsamorhiza sagittata) and naturalized (Secale cereale, Centaurea cyanus) species. Seed predation limited seedling emergence and establishment in both communities in the absence of competition in a pattern reflecting natural plant abundance: S. cereale was most suppressed, B. tectorum was least suppressed, and P. spicata was suppressed at an intermediate level. Furthermore, seed predation reduced the residual seed bank for all species. Seed mass correlated with seed removal rates in the forest and their subsequent effects on plant recruitment; larger seeds were removed at higher rates than smaller seeds. Our vegetation surveys indicate higher densities and canopy cover of nonnative species occur in the steppe compared with the forest understory, suggesting the steppe may be more susceptible to invasion. Seed predation alone, however, did not result in significant differences in establishment for any species between these communities, presumably due to similar total small-mammal abundance between communities. Consequently, preferential seed predation by small mammals predicts plant establishment for our test species within these communities but not between them. Accumulating evidence suggests that seed predation can be an important biotic filter affecting plant establishment via differences in consumer preferences and abundance with important ramifications for plant invasions and in situ community assembly.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationConnolly, B. M.; Pearson, D. E.; Mack, R. N. 2014. Granivory of invasive, naturalized, and native plants in communities differentially susceptible to invasion. Ecology. 95(7): 1759-1769.
Keywordsbiotic resistance, eastern Washington, USA, exclosure, forest plant communities, invisibility, invasiveness, recruitment, seed addition, seed bank, seed predation, steppe plant communities
- Community structure affects annual grass weed invasion during restoration of a shrub-steppe ecosystem
- Effects of picloram application on community dominants vary with initial levels of spotted knapweed (Centaurea stoebe) invasion
- Plant recruitment and soil microbial characteristics of rehabilitation seedings following wildfire in northern Utah
XML: View XML