NCEAS Project 8980

Interactions between mammalian herbivores and associated plant communities

  • John L. Orrock

ActivityDatesFurther Information
Postdoctoral Fellow1st June 2004—30th June 2007Participant List  
Graduate Student1st April—30th June 2006Participant List  

The grasslands of California represent one of the most dramatic biological invasions in the world: 9.2 million ha (almost 25% of the entire state) are dominated by non-native plants. My work at NCEAS will evaluate whether non-native plants subsidize native consumers, leading to stronger impacts of native consumers on native plants (i.e. apparent competition). Furthermore, I will characterize how differences in consumer behavior among patches change the spatial extent of apparent competition (and thus invasion).

TypeProducts of NCEAS Research
Journal Article Damschen, Ellen I.; Haddad, Nick; Orrock, John L.; Tewksbury, Joshua; Levey, Douglas J. 2006. Corridors increase plant species richness at large scales. Science. Vol: 313. Pages 1284-1286.
Journal Article Fryxell, John M.; Wilmshurst, John F.; Sinclair, Anthony R. E.; Haydon, Daniel T.; Holt, Robert D.; Abrams, Peter A. 2005. Landscape scale, heterogeneity, and the viability of Serengeti grazers. Ecology Letters. Vol: 8(3). Pages 328-335.
Journal Article Motheral, Sara M.; Orrock, John L. 2010. Gastropod herbivore preference for seedlings of two native and two exotic grass species. American Midland Naturalist. Vol: 163(1). Pages 106-114.
Journal Article Orrock, John L.; Fletcher, Robert J. 2005. Changes in community size affect the outcome of competition. American Naturalist. Vol: 166(1). Pages 107-111.
Journal Article Orrock, John L. 2005. Conservation corridors affect the fixation of novel alleles. Conservation Genetics. Vol: 6. Pages 623-630.
Journal Article Orrock, John L.; Damschen, Ellen I. 2005. Corridors cause differential seed predation. Ecological Applications. Vol: 15(3). Pages 793-798.
Journal Article Orrock, John L.; Damschen, Ellen I. 2005. Fungi-mediated mortality of seeds of two old-field plant species. Journal of the Torrey Botanical Society. Vol: 132. Pages 613-617.
Journal Article Orrock, John L.; Danielson, Brent. 2005. Patch shape, connectivity, and foraging by oldfield mice (Peromyscus polionotus). Journal of Mammalogy. Vol: 86(3). Pages 569-575.
Journal Article Orrock, John L. 2005. The effect of gut passage by two species of avian frugivore on seeds of pokeweed, Phytolacca americana. Canadian Journal of Botany-Revue Canadienne de Botanique. Vol: 83. Pages 427-431.
Journal Article Orrock, John L.; Levey, Douglas J.; Danielson, Brent; Damschen, Ellen I. 2006. Seed predation, not seed dispersal, explains the landscape-level abundance of an early-successional plant. Journal of Ecology. Vol: 94. Pages 838-845.
Journal Article Orrock, John L.; Damschen, Ellen I. 2007. The effect of burial depth on removal of seeds of Phytolacca americana. Southeastern Naturalist. Vol: 6(1). Pages 151-158.
Journal Article Orrock, John L. 2007. Useful distraction: Ritualized behavior as an opportunity for recalibration. Behavioral and Brain Sciences. Vol: 29(6). Pages 625-626.
Journal Article Orrock, John L.; Witter, Martha S.; Reichman, O. J. 2008. Apparent competition with an exotic plant reduces native plant establishment. Ecology. Vol: 89. Pages 1168-1174.
Data Set Orrock, John L. 2008. Effect of Brassica nigra on the pressure of native consumers on Nassella pulchra in Cheeseboro Canyon. (Online version)
Data Set Orrock, John L. 2008. Rodent effects on Nassella pulchra recruitment at Cheeseboro Canyon. (Online version)
Journal Article Orrock, John L.; Hoisington-Lopéz, Jessica L. 2009. Mortality of exotic and native seeds in invaded and uninvaded habitats. ACTA Oecological-International Journey of Ecology. Vol: 35. Pages 758-762. (Online version)
Journal Article Orrock, John L.; Witter, Martha S.; Reichman, O. J. 2009. Native consumers and seed limitation constrain the restoration of a native perennial grass in exotic habitats. Restoration Ecology. Vol: 17(1). Pages 148-157.
Journal Article Orrock, John L.; Witter, Martha S. 2010. Multiple drivers of apparent competition reduce re-establishment of a native plant in invaded habitats. Oikos. Vol: 119. Pages 101-108.
Journal Article Orrock, John L.; Holt, Robert D.; Baskett, Marissa L. 2010. Refuge-mediated apparent competition in plant–consumer interactions. Ecology Letters. Vol: 13. Pages 11-20.
Journal Article Orrock, John L.; Baskett, Marissa L.; Holt, Robert D. 2010. Spatial interplay of plant competition and consumer foraging mediate plant coexistence and drive the invasion ratchet. Proceedings of the Royal Society B-Biological Sciences. Vol: 277. Pages 3307-3315. (Online version)
Journal Article Orrock, John L. 2010. When the ghost of predation has passed: Do rodents from islands with and without fox predators exhibit aversion to fox cues?. Ethology. Vol: 116. Pages 338-345. (Online version)
Journal Article Seabloom, Eric; Borer, Elizabeth T.; Martin, Burl A.; Orrock, John L. 2009. Effects of long-term consumer manipulations on invasion in oak savanna communities. Ecology. Vol: 90(5). Pages 1356–1365.