Abstract
There are many endemic species in the Japanese Ogasawara Islands. However, many of these endemic species are likely to disappear as a result of reduction of habitat and the introduction of exotic species. Odonates are included within this category of species at risk. If the decrease in endemic odonates is due to a decrease in aquatic habitat, we have only to provide arti” flcial ponds to conserve these species. In this study, we provided artificial ponds as a habitat for odonates in Chichi-jima and Ani-jima, Ogasawara Islands. We then examined the possibility of protection and enhancement of odonate populations. Endemic odonates were found in the natural ponds of Ani-jima and Ototo-jima. In Ani-jima, they could be collected both in the artificial and natural ponds. The artificial pond could provide habitat for endemic odonates. However, in Chichi-jima, few odonates could be collected both in the artificial and natural ponds. Here, invasive species, such as Gambusia affinis and Anolis carolinensis, are found, which considered to prey upon odonate larvae and adults. Extermination of invasive species may be necessary to conserve the endemic odonates in Chichi-jima.
Reprinted from Yoshimura M, Okochi I (2005) Bulletin of FFPRI 4:45–51, with permission of FFPRI.
1) Kansai Research Center, Forestry and Forest Products Research Institute (FFPRI)
2) Department of Forest Entomology, Forestry and Forest Products Research Institute (FFPRI)
(Received on 20 March 2003, Accepted on 4 July 2003)
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Acknowledgments
We would like to thank to T. Oobayashi, for helping the collection of aquatic invertebrate. Collection of endemic and natural monumental odonatan species was done with the permission of Ogasawara broad of education, Tokyo Metropolis and the Agency for Cultural Affairs. This work was supported by a grant funded by the Japan Environmental Agency.
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Mayumi, Y., Isamu, O. (2010). A decrease in endemic odonates in the Ogasawara Islands, Japan. In: Kawakami, K., Okochi, I. (eds) Restoring the Oceanic Island Ecosystem. Springer, Tokyo. https://doi.org/10.1007/978-4-431-53859-2_21
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