A window of opportunity: Subdominant predators can use suboptimal prey.

Introduced species have been linked to declines of native species through mechanisms including intraguild predation and exploitative competition. However, coexistence among species may be promoted by niche partitioning if native species can use resources that the invasive species cannot. Previous research has shown that some strains of the aphid are toxic to a competitively dominant invasive lady beetle, . Our objective was to investigate whether these aphids might be an exploitable resource for other, subdominant, lady beetle species. We compared larval development rate, survival, and adult weight of five lady beetle species in no-choice experiments with two different strains of , one of which is toxic to and one that is nontoxic. Two lady beetle species, and were able to complete larval development when feeding on the aphid strain that is toxic to , experiencing only slight developmental delays relative to beetles feeding on the other aphid strain. One species, also was able to complete larval development, but experienced a slight reduction in adult weight. The other two lady beetle species, and , demonstrated generally low survivorship when consuming , regardless of aphid strain. All five species showed increased survival and/or development relative to on the "toxic" aphid strain. Our results suggest that this toxic trait may act as a narrow-spectrum defense for the aphids, providing protection against only some lady beetle enemies. For other less-susceptible lady beetles, these aphids have the potential to provide competitive release from the otherwise dominant .