, Volume 583, Issue 1, pp 377–381 | Cite as

Notes on predators and their effect on the survivorship of the endangered giant water bug, Kirkaldyia (= Lethocerus) deyrolli (Heteroptera, Belostomatidae), in Japanese rice fields

Short Research Note


A field research was carried out in Hyogo Prefecture, Japan in order to establish the role of the water-scorpion, Laccotrephes japonensis Scott as predator of nymphs of the endangered giant water bug, Kirkaldyia (= Lethocerus) deyrolli. To assess the impact of this predator, a field experiment was set up with (Control) and without L. japonensis (Removed). The survival rate of K. deyrolli in Removed treatment was higher than in the Control. Our experimental results showed that L. japonensis is an important predator for K. deyrolli nymphs in the field.


Laccotrephes japonensis Field experiment predator-prey rice field community ecology 



I wish to acknowledge valuable comments and discussion with P. Goodwyn of Kyoto University and H. Mitsuhashi of the Museum of Nature and Human Activities. I am also grateful to K. Hidaka, T. Kojima, T. Mano, N. Goto, and N. Asagi from my laboratory and M. Yamamoto and other farmers of the study site for their support. This study was partly supported by a grant from the Zoshinkai Fund for Protection of Endangered Animals.


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Laboratory of Agricultural and Biological Production Management, Graduate School of Agricultural ScienceEhime UniversityMatsuyama EhimeJapan
  2. 2.Laboratory of Insect Ecology, Graduate School of Natural Science and TechnologyOkayama UniversityTsushima OkayamaJapan

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