Document: MIK-3-52-1

Apparent competition in heterogeneous environments.

BONSALL, M.* and M.HASSELL

Imperial College, University of London, United Kingdom 1

Abstract:
Prey that exists exclusively on different resources can compete in an indirect manner if they share common natural enemies. This is colloquially known as apparent competition. The role of apparent competition in homogenous (uniform) environments is well known and often leads to the exclusion or dramatic reduction in abundance of one of the prey species. Here, we explore the effects of apparent competition in heterogeneous environments. By considering a stylised interaction between two hosts and a polyphagous parasitoid, we demonstrate, theoretically, how environmental heterogeneity can influence coexistence. In particular, we highlight (1) how the underlying spatial distribution of hosts is paramount in influencing coexistence, (2) the role of temporal switching effects on coexistence and (3) the effects of spatial aggregative behaviours. We emphasis the different sources of variation that are prevalent in promoting coexistence in host-parasitoid assemblages where indirect interactions occur.

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This abstract is being presented at: 2:15 PM in session:
Oral Session #15: Parasitoids and Diseases.