トビハゼにおける周期的給餌への活動リズムの同調

概要

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The activity rhythms of the mud-skipper, Periophthalmus cantonensis (Osbeck), collected from the tidal flats of Ariake Sound, were examined under controlled laboratory conditions. Because of their behavioral characteristics in the habitat, it was observed that most of their activity time in the experimental aquarium was spent in crawling activity. Free-running rhythm of activity in the fish, which was kept in a constant low level of sea water, in constant temperature, and in continuous darkness, showed a circatidal nature. In order to examine whether the feeding cycle could be used to set the phase of their activity rhythm, feeding was cyclic with periods of 12 or 24 hrs in a constant environment. One fish was fed at 10:00 and 22:00 for 58 successive days. The other was fed at noon for 22 successive days. In both fish, most of the activities began to cluster within a few hours before the feeding time, at several days following the initiation of the cyclic feeding. These pre-feeding acctivities of the fish still persisted when the feeding was stopped. These results indicate that the activity rhythms of the fish were entrained to these periods by the feeding cycles of 12 or 24 hours. It may be also suggest that the fish are capable of learning the time of feeding.
社団法人日本動物学会の論文
1975-09-25