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ISSN : 2287-8327
An integrated approach to tropical and subtropical island conservation
Kiyoshi Satake (ational Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Tomomi Inoue (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Taku Kadoya (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Seiji Hayashi (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Koichi Kinjo (Okinawa Prefectural Institute of Health and Environment, Osato, Nanjo, Okinawa 901-1202, Japan)
Daisuke Nakajima (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Hiroyuki Oguma (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Satoshi Ishiguro (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Azusa Okagawa (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Shinsuke Suga (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
Tetsuya Horie (Faculty of Environmental Studies, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan)
Katsuhito Nohara (Hokusei Gakuen University, 2-3-1 Oyachi-Nishi, Atsubetsu-ku, Sapporo 004-8631, Japan)
Naoko Fukayama (Tokyo Keizai University, 1-7-34 Minami, Kokubunji, Tokyo 185-8502, Japan)
Akira Hibiki (National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)
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Abstract
After the reversion of Okinawa (Ryukyu Islands) to Japan in 1972, extensive urban and agricultural development resulted in a significant increase in sediment discharge to coastal waters. The release of sediment has caused the degradation of freshwater and coastal ecosystems and biodiversity. A consideration for catchment-to-reef continua, as well as agricul¬tural (socioeconomic) factors is necessary to establish proper land-based management plans for the conservation of the island environment. We have set up a framework to integrate biophysics and socioeconomics: 1) setting a conservation target and threshold, 2) identifying the sources and processes, and 3) examining cost-effectiveness and management pri¬orities. The framework may be applicable to other tropical and subtropical islands with similar characteristics.
- keywords
- island conservation, red-soil pollution, coral reef, Ryukyu Islands, Japan
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