Bloom of Coscinodiscus wailesii and DO deficit of bottom water in Seto Inland Sea
In: Marine Pollution Bulletin. Macmillan: London. ISSN 0025-326X; e-ISSN 1879-3363, more
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| Keywords |
Chemical elements > Nonmetals > Atmospheric gases > Oxygen > Dissolved gases > Dissolved oxygen
Chemical reactions > Degradation
Equipment > Measuring devices > Light measuring instruments > Secchi discs
Nutrients
Nutrients (mineral)
Visibility
Water > Bottom water
Coscinodiscus wailesii Gran & Angst, 1931 [WoRMS]
Marine/Coastal |
| Abstract |
Relationships among high values of Secchi disc visibility, DO deficit in bottom layer and bloom of a giant diatom Coscinodiscus wailesii in eastern Seto Inland Sea were examined. C. wailesii appeared in autumn when water temperature went down, developed to bloom absorbing much amounts of nutrients. Decline of the bloom occurred with quick deposition onto the bottom mud. Consequently, Secchi disc visibility became very high in this area and the decayed giant diatom was sedimented. During low temperature of water, the diatom was kept as organic matter in the sediment and decomposed as the temperature of water went up. The cause of the recent DO deficit of the bottom water in Seto Inland Sea was attributed to the decomposition of this giant diatom in the sediment accelerated by raise of bottom water temperature. |
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