Abstract
Spider mites inhabiting Sasa bamboo show considerable variation in traits believed to be the result of coevolution between predator and prey. In Schizotetranychus recki Ehara inhabiting the hairy leaves of a dwarf bamboo, Sasa senanensis, all quiescent stages, including eggs, appear within web boxes in the leaf hairs of their host plant, and this habit is thought to be a trait involved in predator avoidance. To test this hypothesis, the survival rates of S. recki eggs inside a web box and those freed of a web box were assessed in relation to six predator species that co-occur with the spider mite in the field. The results clearly show that the webbing behavior (web box) of S. recki has a function in avoiding five predator species. However, one predator species, Agistemus summersi Ehara, preyed more on eggs protected by a web box. This suggests that this predator species has a special trait to overcome the nest barriers.
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Acknowledgements
We thank Drs. Y. Watanuki, E. Hasegawa, K. Mori, and T. Sakagami for their valuable suggestions. We also acknowledge Mr. K. Ito for his kind assistance. This work was supported by Grants-in-Aid for Scientific Researches (B) (nos. 13440227 and 13575021) from JSPS.
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Horita, M., Chittenden, A.R., Sato, Y. et al. Function of the web box as an anti-predator barrier in the spider mite, Schizotetranychus recki . J Ethol 22, 105–108 (2004). https://doi.org/10.1007/s10164-003-0101-3
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DOI: https://doi.org/10.1007/s10164-003-0101-3