Hatoma Island, with about 50 residents, is located north of Iriomote island, Taketomi town, Okinawa prefecture. Depopulation caused a serious threat of school closure. However, the islanders accepted “Kaihin Ryugakusei”, children from outside the island, so that they could maintain the school. After improvement of transportation, increase in accommodation and restaurants have increased the number of tourists rapidly.
The purpose of this study is to focus on the residents’ perceptions of tourism and that of the future. The study found that most islanders welcome the increase of tourists. They emphasized that the tourism would make island economy more active. However, some islanders felt environmental degradation, such as garbage problems and the bad tourist manners. On tourist attraction of the island, most answers were the ‘seas’, followed by ‘nothingness’ and ‘slow life’.
Along the southern coast of Ie Island, 26 ruins have been excavated. We estimated ΔR value from a series of archaeological charcoal-shell pairs collected from three archaeological sites, located in middle of the southern coast. AMS 14C ages of nine fossil shells and four charcoal samples were used to determine the ΔR values of Ie Island.
ΔR value calculated for the Nagarabaru-3 shell mound （3,400 cal BP） yielded an age of 250±26 14C yr （n=2）, and a ΔR value determined for Kayabaru site-A （1,300 cal BP） yielded an age of 132±21 14C yr （n=5）. While a ΔR value of Nagarabaru-east shell mound （1,500 cal BP） yielded an age of −38±27 14C yr （n=2）.
The results of this study indicate a change of ΔR values during the period 3,400～1,300 cal BP with a sudden fall probably occurring at around 1,500 cal BP. Incorporating the above ΔR values into a calibration program, we are able to obtain not only calendar ages on the excavated ruins of Ie Island, but also obtain important information to discuss the geomorphic development of Ie Island based on the re-calibrated ages.