| SS6.07 Optical Observation of Phytoplankton Dynamics: Looking Beyond Biomass |
| Yoshino, K, , Ehime University, Matsuyama, Japan, adams@sci.ehime-u.ac.jp |
| Fukumoto, T, , Consortium of Aquatic Ecosystems Protection Activities, Matsuyama, Japan, toorufukumoto@mail.goo.ne.jp |
| Okuda, N, , Ehime University, Matsuyama, Japan, nokuda@sci.ehime-u.ac.jp |
| Ohmori, K, , Ehime University, Matsuyama, Japan, ohmori@sci.ehime-u.ac.jp |
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| THE PRIMARY PRODUCTION PROCESS OF AN AREA OF SAND BANKS IN AKI-NADA, THE COAST OF SHIKOKU ISLAND, JAPAN |
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| Primary production rate is determined by a nutrient supply and the intensity of solar radiation. In stratified waters, phytoplankton trapped in the warm surface layer benefits from sufficient light, but face a short of nutrient supply from the bottom layer. The ideal condition for primary production process is a stratified surface water with a sufficient nutrient supply. Seto Inland Sea has many sand banks adjacent to straits. In Aki-nada, the water column on sand banks was daily stratified in summer, and we could observe a high concentration of chlorophyll in the stratified surface on the sand banks. Here, the water temperature of the lower layer on the banks was identical to that of the strait. These results suggest that a nutrient supply from the well-mixed strait to water column on the sand banks at night leads to the high primary production in the daily stratified surface layer in the daytime. Sand materials have been taken away from sand banks in Seto Inland Sea, but this activity should be stopped for maintaining high productivity in the waters. |
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