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Consumption of introduced prey by native predators: Argentine ants and pit-building ant lions

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Abstract

When populations of native predators are subsidized by numerically dominant introduced species, the structure of food webs can be greatly altered. Surprisingly little is known, however, about the general factors that influence whether or not native predators consume introduced species. To learn more about this issue, we examined how native pit-building ant lions (Myrmeleon) are affected by Argentine ant (Linepithema humile) invasions in coastal southern California. Compared to areas without L. humile, invaded areas contained few native ant species and were deficient in medium-sized and large bodied native ants. Based on these differences, we predicted that Argentine ants would negatively affect ant lion larvae. Contrary to this expectation, observational surveys and laboratory growth rate experiments revealed that Myrmeleon were heavier, had longer mandibles, and grew more quickly when their main ant prey were Argentine ants rather than native ants. Moreover, a field transplant experiment indicated that growth rates and pupal weights were not statistically different for larval ant lions reared in invaded areas compared to those reared in uninvaded areas. Argentine ants were also highly susceptible to capture by larval Myrmeleon. The species-level traits that presumably make Argentine ant workers susceptible to capture by larval ant lions—small size and high activity levels—appear to be the same characteristics that make them unsuitable prey for vertebrate predators, such as horned lizards. These results underscore the difficulties in predicting whether or not numerically dominant introduced species serve as prey for native predators.

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Acknowledgements

We thank TPSR for permits to conduct our research. T. Anderson-McGill, C. Cammacho, and C. Mohr assisted in the field. J. Kohn, S. Menke, J. Nieh, A. Suarez and E. Wilson provided helpful input on the study. For invaluable advice concerning identification of material, we thank D. Baumgardner and J.D. Oswald (Texas A&M University) and P.S. Ward (UC Davis). All experiments comply with current US laws.

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Correspondence to David Holway.

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Glenn, S., Holway, D. Consumption of introduced prey by native predators: Argentine ants and pit-building ant lions. Biol Invasions 10, 273–280 (2008). https://doi.org/10.1007/s10530-007-9128-7

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