Laguna : 汽水域研究

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Laguna : 汽水域研究 10
2003-03 発行

京都府阿蘇海における底生有孔虫群

Foraminiferal Assemblages in Aso-kai Lagoon, Central Japan
高田 裕行
村上 俊介
坂井 三郎
田中 里志
髙安 克已
ファイル
内容記述(抄録等)
Benthic foraminifera are investigated in Aso-kai Lagoon, central Japan, to understand the habitat of the anoxic environment. The condition of the deep bottom is anoxic almost throughout the year. Five taxa are commonly found in this lagoon, of which Virgulinella fragilis dominates the inner to central area and the deeper parts of the lagoon. The occurrence of the other common taxa, such as Trochammina cf. japonica, Ammonia cf. A. beccarii forma l, Rosalina spp. and Elphidium sp.A, is restricted to the adjacent part of the sand bar, called Amano-hashidate. V. fragilis has a very high tolerance to almost year-round anoxic condition. The results suggest that the seasonal changes in the dissolved oxygen levels of the bottom waters mainly control the distribution of benthic foraminifera in this lagoon.