中海湖心部における湖底の水中映像(その3) : 貧酸素環境におけるバクテリアマットの回復状況

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  • Pictures of bottom surface in the central part of Lake Nakaumi (part 3) : Recovery of damaged bacterial mat in a low oxygen condition
  • ナカウミ コシンブ ニオケル コテイ ノ スイチュウ エイゾウ ソノ3 : ヒンサンソ カンキョウ ニオケル バクテリア マット ノ カイフク ジョウキョウ

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Abstract

Bacterial mat is commonly found on the fl oor of Lake Nakaumi from late spring to late autumn. Particularly bacterial mat develops in a low oxygen condition（dysoxic to anoxic environment）of bottom water and without the bottom water turbulence. In such a bottom water condition, a fi sh stripped off the bacterial mat and consequently a muddy lake fl oor appeared in the size of about 16 cm diameter. However, the bacteria are very productive in the low oxygen water. We observed the recovery of bacterial mat is completed by about 18 hours after that the muddy substrate cropped out.

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