Skip to Main Content
Biotic resistance via granivory: Establishment by invasive, naturalized, and native asters reflects generalist preferenceAuthor(s): Dean E. Pearson; Ragan M. Callaway; John L. Maron
Source: Ecology. 92(9): 1748-1757.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
PDF: View PDF (431.72 KB)
Related Research Highlights
Why Do the Exotics Beat the Natives: Where Is the Home-Team Advantage
DescriptionEscape from specialist natural enemies is frequently invoked to explain exotic plant invasions, but little attention has been paid to how generalist consumers in the recipient range may influence invasion. We examined how seed preferences of the widespread generalist granivore Peromyscus maniculatus related to recruitment of the strongly invasive exotic Centaurea stoebe and several weakly invasive exotics and natives by conducting laboratory feeding trials and seed addition experiments in the field. Laboratory feeding trials showed that P. maniculatus avoided consuming seeds of C. stoebe relative to the 12 other species tested, even when seeds of alternative species were 53-94% smaller than those of C. stoebe. Seed addition experiments conducted in and out of rodent exclosures revealed that weakly invasive exotics experienced relatively greater release from seed predation than C. stoebe, although this was not the case for natives. Seed mass explained 81% of the variation in recruitment associated with rodent exclusion for natives and weak invaders, with larger-seeded species benefiting most from protection from granivores. However, recruitment of C. stoebe was unaffected by rodent exclusion, even though the regression model predicted seeds of correspondingly large mass should experience substantial predation. These combined laboratory and field results suggest that generalist granivores can be an important biological filter in plant communities and that species-specific seed attributes that determine seed predation may help to explain variation in native plant recruitment and the success of exotic species invasions.
- 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.
CitationPearson, Dean E.; Callaway, Ragan M.; Maron, John L. 2011. Biotic resistance via granivory: Establishment by invasive, naturalized, and native asters reflects generalist preference. Ecology. 92(9): 1748-1757.
Keywordsbiotic resistance, Centaurea maculosa, Centaurea stoebe, chemical defense, feeding trials, Peromyscus maniculatus, recruitment, seed addition, seed mass, seed predation
- Deer mouse predation on the biological control agent, Urophora spp., introduced to control spotted knapweed
- Mitigating exotic impacts: restoring native deer mouse populations elevated by an exotic food subsidy
- An indirect dispersal pathway for spotted knapweed seeds via deer mice and great-horned owls
XML: View XML