Interactions between organisms have an extensive
influence on their distribution and abundance. Historically,
competition, predation and ecosystem engineering
were considered to be important factors controlling
community structure (Jones et al. 1994, Begon et al.
1996). More recently, the importance of symbiosis,
mostly the role of parasitism or mutualism, has been
identified in changing other interactions (e.g. Clay &
Holah 1999, Clay 2001, Hatcher et al. 2006). However,
few studies show that symbiosis can modify community
structure.