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RELATION BETWEEN DIEL VERTICAL MIGRATION AND LOCOMOTOR ACTIVITY OF A MARINE HYPERIIDEAN AMPHIPOD, THEMISTO JAPONICA (BOVALLIUS)

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image of Journal of Crustacean Biology

ABSTRACT Specimens of a hyperiidean amphipod, Themisto japonica (Bovallius), were collected in the Sea of Japan off Wakasa Bay from different layers between 0 and 300 m depth in May 1982. Analysis of the specimens disclosed that: (1) juveniles were distributed in higher layers than adults during both day and night, and (2) both juveniles and adults were distributed in higher layers at night than in the daytime. Locomotor activity of individuals of T. japonica was observed in a laboratory aquarium. My observations indicated that: (1) any individual that had been swimming began sinking downward passively in the water as soon as it stopped its swimming motions, and (2) at night most of the individuals were swimming actively, separated from each other, while in the daytime they remained almost motionless near the bottom, in contact with each other, forming clusters. It is pointed out that the upward and downward migration, a phenomenon on the population level, and the rise and fall in the locomotor activity, a phenomenon on the individual level, are seen to occur simultaneously. This simultaneity is also reported in a fresh-water gammaridean amphipod, Anisogammarus annandalei. A suggested common mechanism which brings about the diel vertical migration of both of these two amphipod species is discussed.

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/content/journals/10.1163/193724088x00062
1988-01-01
2016-12-03

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