Abstract
Paleoenvironmental changes during the last 1,200 years in Aso-kai Lagoon (central Japan) were inferred from the record of fossil benthic foraminifera in cores ASC2 (4 m length) and Aso4-2 (1.6 m length) taken from the center of the lagoon. Analysis of fossil foraminifera showed an alternation between bay environment and seasonally oxygen-poor brackish environment that was repeated twice in the lower part of these cores (before ∼380 cal BP). Year-round near-anoxia with occasional periods of increased oxygen level was established in the upper part of the cores (after ∼380 cal BP), indicating a restricted lagoon. The temporary increases of the dissolved oxygen level near the lagoon bottom in the upper part of the cores are probably related with sand-bar breaches and channel reopening due to extreme storms since seventeenth century.
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