SUTUDY ON BEHAVIOR RUDITAPES PHILIPPINARUM IN HYPOXIC AND ANOKIC WATER

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  • 貧酸素・無酸素化した海水中でのアサリの行動に関する考察
  • ヒンサンソ ・ ムサンソカ シタ カイスイチュウ デ ノ アサリ ノ コウドウ ニ カンスル コウサツ

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Abstract

 Sensors were attached to the shells of Ruditapes philippinarum manila clams, and their behavior in an anoxic environment was continuously observed. As a result, (1) the behavior of the clams could be classified into four types based on their shell opening and closing patterns . When the clams were placed in an anoxic environment for 24 hours, they behaved abnormally, and even when returned to sea water with sufficient oxygen, the clams' behavior did not return to normal. It was shown that the clams did not recover from the effect of oxygen deprivation in a short time and that the effect is cumulative. Although the clearance rate slowed temporarily, it recovered when the clams were placed in an environment with oxygen for four days. Manila clams intermittently exposed to low oxygen levels throughout the year in Omaehama, in the inner part of Osaka Bay, showed the same pattern of behavior as those in the laboratory experiments. Furthermore, when a blue tide occurred, they closed their shells, displaying behavior aimed at preventing hydrogen sulfide from touching the soft body, and they were still alive after the blue tide broke up.

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