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An integrated approach to tropical and subtropical island conservation
Hiroya Yamano,Kiyoshi Satake,Tomomi Inoue,Taku Kadoya,Seiji Hayashi,Koichi Kinjo,Daisuke Nakajima,Hiroyuki Oguma,Satoshi Ishiguro,Azusa Okagawa,Shinsuke Suga,Tetsuya Horie,Katsuhito Nohara,Naoko Fukay 한국생태학회 2015 Journal of Ecology and Environment Vol.38 No.2
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.
An integrated approach to tropical and subtropical island conservation
Yamano, Hiroya,Satake, Kiyoshi,Inoue, Tomomi,Kadoya, Taku,Hayashi, Seiji,Kinjo, Koichi,Nakajima, Daisuke,Oguma, Hiroyuki,Ishiguro, Satoshi,Okagawa, Azusa,Suga, Shinsuke,Horie, Tetsuya,Nohara, Katsuhit The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.2
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 agricultural (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 priorities. The framework may be applicable to other tropical and subtropical islands with similar characteristics.
제주/쓰시마 조초성 산호의 수온 기록자로서의 가능성 평가
형기성,Michiyo Shimamura,Hiroya Yamano,Kaoru Sugihara,김종욱,Tsuyoshi Watanabe 한국해양과학기술원 2008 Ocean and Polar Research Vol.30 No.3
In an effort to develop high-resolution sea surface temperature (SST) proxies for mid-latitude regions, two massive reef-building coral species, Alveopora and Favia, were collected from Jeju and Tsushima Islands, respectively. Their skeletons were subsequently analyzed for annual growth banding, Sr/Ca and Mg/Ca ratios. Hermatypic corals are thinly distributed in the waters of Jeju Island, where Alveopora japonica was the only dominant coral species. A higher diversity of hermatypic corals were observed in the waters of Tsushima Island, where Favia sp. was the most common coral species and even forming an about 6-m-high reef structure. Both Alveopora and Favia showed annual growth layers consisting of couplets of high- and low-density bands. Sr/Ca ratio of both species and Mg/Ca ratio of Alveopora also showed seasonal variation, likely reflecting SST variation. These results suggest the possibility that Alveopora and Favia species can be used as potential SST proxies. However, this study also highlights the potential growth disturbance of middle latitude corals due to high rainfall during monsoon and low SST during winter. This possibility should be taken into account in the investigation of Sr/Ca(Mg/Ca)-SST relationships.
The recreational value of coral reefs in Okinawa Prefecture: A site choice model
( Katsuhito Nohara ),( Azusa Okagawa ),( Akira Hibiki ),( Hiroya Yamano ) 한국환경경제학회·한국자원경제학회(구 한국환경경제학회) 2018 한국환경경제학회 학술발표논문집 Vol.2018 No.하계
The coral reef ecosystems provide many goods and services to coastal populations, such as tourism. Furthermore, they form a unique natural ecosystem, with an important biodiversity value as well as scientific and educational value. They also form a natural protection against wave erosion. However, they have been damaged due to red soil erosion and global warming. Therefore, the preservation of coral reefs has been an important policy issue. The cost-benefit analysis is important for choosing cost-effective policies. Although a few studies have evaluated the economic value of coral reefs in Okinawa Prefecture, Japan, most of them have applied the contingent valuation method. The purpose of this study is to employ the discrete choice travel cost method to estimate the value of coral reefs that is obtained by visitors to Okinawa prefecture. We conducted an on-site survey of visitors at Naha airport, New Ishigaki airport and Miyako airport on 8 November to 11 in 2013 and collected 410 responses. We applied the conditional logit model to tourist’s decision to select his/her destination and estimate the model using collected data. Based on the conditional logit model, the hypothesis of independence from irrelevant alternatives (IIA) cannot be rejected. We also tried to apply the mixed logit model to our data but there was no significant difference between random parameters and nonrandom ones. The main finding is that the marginal willingness to pay by a tourist for coral reefs is 4,754 yen/km2 per day and 16,544 yen/㎢ per trip.