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In addition to having a positive effect on species richness (species-area relationships [SARs]), habitat area can influence the presence of predators, which can indirectly influence prey richness. While these direct and indirect effects of area on richness occur simultaneously, no research has examined how predation might contribute to SAR variation. We extend MacArthur and Wilson's equilibrium theory of island biogeography by including predationinduced shifts in prey extinction and predictdoi:10.2307/4541129 pmid:17891741 fatcat:mlxef4jovrbyjmfoang4mq7gtq