Kume Island Research Articles

The use of barnacles to measure and date relative sea-level changes in the Ryukyu islands, Japan

Fossil intertidal barnacles are excellent indicators of recnet sea-level stands, even those of short duration, especially on elevated rocky coasts. This paper deals with problems related to finding, sampling, cleaning, dating and interpreting the altimetric significance of fossil barnacle samples collected in a living position. The distribution and ecology of Octomeris sulcata, Tetraclitella and Chthamalus are described. Examples are provided for the reconstruction of relative sea-level variations due to sudden uplift movements (Okinawa and Toku Islands), to gradual uplift movements (Kume Island) and to a slight relative emergence since ca. 600 yr. B.P. that has been reported for the first time in several Ryukyu Islands.

Local Wind estimated by the Wind-shaped Tree in the Kume Island

Local Wind estimated by the Wind-shaped Tree in the Kume Island

Sterilization of the Melon Fly, Dacus cucurbitas COQUILETT, with Gamma Radiation : Effect of Dose on Competitiveness of Irradiated Males

The relationships between radiation dose and mating competitiveness of gama irradiated melon fly males were studies with two methods; those being FRIED'S method and the method of the direct counting of normal and irradiated flies in copula under the coexistence of normal females, normal males and irradiated males.In the former method, the mating competitiveness of irradiated males did not reduced significantly with doses from 1 to 10 kR, but at 30 kR, reduced significantly.In the latter merhod, the mating competitiveness values of males irradiated with 7 and 12 kR were less than unity, but not significant. At 30 kR, the mating competitiveness reduced significantly. It can be said that the harmful effect of irradiation on the mating competitiveness of the melon flies was negligible with a dose of 7 kR, which was used in the eradication project of melon fly from Kume Island.