The Research for Dynamics of Oxygen in the Eutrophicated Shallow Sea Area
On the Artificial Tidal Flat of Hannan Second District in Osaka Bay
2007 Volume 54 Pages 1261-1265
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2007 Volume 54 Pages 1261-1265
The present paper dealt with the distribution and dynamics of oxygen at the artificial tidal flat of Hannan Second District, Osaka Bay.
Oxygen-deficient waters were found on September 2005 and July 2006 at the bottom of shallow area of the artificial tidal flat where ground levels were from D. L.-2.3 to D. L.-1.9m. Photosynthesis of phytoplankton and seaweed played an important role on the dynamics of oxygen at the artificial tidal flat. Release of oxygen by phytoplankton changed depending on photon flux density, while dominant seaweed, Ulva sp. showed active photosynthesis in spite of low photon flux density. Oxygen consumption by respiration of Ulva sp. promoted hypoxia at night at the ground level of ca. D. L.-1. Om of the artificial tidal flat.
