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Plant–plant interaction by Aster leiophyllus affects herbivory by Sika deer, Cervus nippon

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Abstract

Changes in leaf traits in response to plant–plant interactions affect feeding by insect herbivores. However, the effects of such changes on feeding by vertebrate herbivores remain unclear. We examined the effects of interactions of Aster leiophyllus collected in the field (growing with plants of the same species [aggregated] or with plants of different species [solitary]) or grown in pots (with another A. leiophyllus [intraspecific] or with Carex aphanolepis or Thalictrum baicalense [interspecific]) on the concentration of total phenolics in A. leiophyllus leaves and on sika deer (Cervus nippon) grazing preference in Japan. Deer were presented for 30 s with the first A. leiophyllus leaf (from either aggregated plants or solitary plants) and then for 30 s with the second leaf (solitary or aggregated, respectively). All of the deer presented first with a leaf from a solitary plant ate it, but when deer were presented first with a leaf from an aggregated plant, which had a higher concentration of total phenolics, 50% rejected or left it. About a third of the deer that had been presented first with a leaf from an aggregated plant subsequently rejected the leaf of a solitary plant. The leaves in the intraspecific interaction pot treatment had higher total phenolic concentration and were rejected more by deer than the leaves in the interspecific treatments. Plant–plant interactions affected deer preference, which was also influenced by learning. These results should improve our understanding of both plant grazing by deer and environmental management.

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Acknowledgements

We thank H. Kobayashi, M. Fujino, M. Yokoyama, and R. Hashikawa for their help with collecting the field data.

Funding

This research was funded by JSPS Grants-in-Aid for Scientists (grants no. 19H03295 to A.Y. and 21J12669 to H.O.) from the Japan Society for the Promotion of Science.

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H. O., K.O., and A. Y. developed the core idea, designed the experiments, analyzed the data, and wrote the article. All authors carried out the experiments.

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Correspondence to Haruna Ohsaki or Akira Yamawo.

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The authors declare no competing interests.

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Communicated by: Matthias Waltert

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Ohsaki, H., Miyamoto, R., Sembongi, Y. et al. Plant–plant interaction by Aster leiophyllus affects herbivory by Sika deer, Cervus nippon. Sci Nat 109, 54 (2022). https://doi.org/10.1007/s00114-022-01827-4

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  • DOI: https://doi.org/10.1007/s00114-022-01827-4

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