| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Research Abstract |
This study revealed that temporal variation of light attenuation in Harima Nada, the eastern Seto Inland Sea, is regulated principally by phytoplankton biomass. Judging from the relative contribution of light attenuation by phytoplankton to total light attenuation, the light attenuation coefficient in this area is estimated to be decrease up to 30% in relation to the progression of de-eutrophication.
We also examined the photosynthetic characteristics of subtidal benthic microalgal populations in the study area. The results indicated that the irradiance intensities of onset of light saturation of microphytobenthos were lower than those of the overlying phytoplankton, and the observed values were almost equivalent to the irradiance intensities of the seafloor. It is therefore suggested that the microphytobenthic populations in the subtidal area would be able to acclimate in response to changes in light environments of the seafloor.
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