Abstract
Some aphid species are known to have mutualistic relationships with tending ants; that is, the aphids supply the ants with honeydew and are protected by the ants. Although spider mites and honeydew-producing aphids often live on the same host plant, it has not previously been determined whether the ants tending these aphids affect spider mite survival. Using replicated microcosms, each containing an artificial ant nest, we compared experimentally the survival of two-spotted spider mites on kidney bean plants with and without cowpea aphids. Our results showed significantly fewer spider mites on plants with aphids, indicating that spider mites were preyed upon by ants tending aphids. On the other hand, there was no detectable plant-mediated indirect effect of aphids on mite performance in the microcosms. Therefore, we conclude that aphids indirectly reduced the survival of spider mites living on the same host plant via their tending ants. Nonetheless, spider mites did not avoid settling on plant leaves infested with aphids.
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Acknowledgements
We thank H. Otsuki and T. Hori and other members in our laboratory for valuable suggestions. This work was supported by Japan Society for the Promotion of Science KAKENHI Grant Number 15K07792 to SY.
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Adachi, M., Yano, S. Ant-mediated indirect negative effects of aphids on spider mites living on the same plant. Exp Appl Acarol 72, 15–21 (2017). https://doi.org/10.1007/s10493-017-0136-8
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DOI: https://doi.org/10.1007/s10493-017-0136-8