Abstract
The present study aims to clarify thermal function of tidal flat and mangrove area in summer and winter. We conducted long-term field measurements for water and soil temperature in Sumiyo Bay, Amami Oshima Is. , which are known as a habitat of Ryukyu-ayu. The results showed that the water temperature of tidal flat and mangrove area was close to that of outer sea in summer and river in winter, showing the heat fluxes from water surface and bottom were dominant in tidal flat and mangrove area. The heat budget analysis indicated that the sensible heat flux from bottom of the tidal flat and mangrove cooled significantly water column in winter.
