Abstract
Spider mites are very small phytophagous organisms living on plant leaves. They possess a diverse array of life types. Such diversity in life type has been supposed to be a result of coevolution between predator and prey, although there is little concrete evidence to support this concept. In Yezonychus sapporensis inhabiting the leaves of a dwarf bamboo, Sasa senanensis, all quiescent stages including eggs appear on the tips of the host leaf hairs during the summer season, and this habit is thought to be a kind of predator avoidance trait. To confirm this, the survival rates of Y. sapporensis eggs deposited on natural sites and experimentally manipulated sites were observed for eight co-occurring predator species. The results clearly showed that the oviposition behavior of Y. sapporensis has a function in avoiding predator attack, at least under experimental conditions.
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