フジメハナガイの潮汐週期移動とその行動解析(第2報)

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1. Donax semignosus Dunker, a mussel found at the sandy beach of the sea, shows a characteristic tidal rhythmic migration. It lives in the wave-washed sand, and makes a shoreward migration at the flood tide and a offshore retreat at the ebb tide in accord with the rise and fall of the sea-level. The detailed observations of this rhythmic migration and the experimental analysis of the behavior at the flood tide have been reported (Mori, '38). In this paper, the experimental analysis of the behavior at the ebb tide and the causes which induce the reversal in the behavior at the ebb and flow are dealt with. These observations and experiments were performed at Okinosu in Tokusima City, in August of 1947, '48 and '49. 2. At the ebb tide, the mussels prepare, in the first place, for the jump-out motion by perceiving the vibration of the beach caused by the surf as it beats the shore (even when they are not actually covered by water), and at this time they still remain beneath the sand projecting their siphons only onto the sand or into the coming water (at the flood tide they jump out at this moment). In the second place, when the water begins to retreat, they jump out of the sand by feeling the current of water, and in the next moment they find themselves at the lower parts of the shore, and then burrowing into the sand, disappear from the surface so as not to be carried upward again by the next surf. 3. The maximum density of population at the ebb tide is found at the place slightly higher than the mean sea-level at that time, and that at the flood tide is located slightly lower (Fig. 1). Therefore the place where the majority of animals inhabit is covered with water for longer period at the flood than at the ebb. Such a delicate difference in the environment which is induced by ebb and flow may partly be responsible for the above mentioned behaviors. But, from various facts, we can not neglect the internal physiogical rhythms as causes of this rhythmic change of behaviors.
社団法人日本動物学会の論文
1950-04-15

フジメハナガイの潮汐週期移動とその行動解析(第2報)

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