|Entrainment of the circatidal rhythm of the estuarine amphipod Corophium volutator (Pallas) to non-tidal cycles of inundation and exposure in the laboratory|In: Journal of Experimental Marine Biology and Ecology. Elsevier: Amsterdam. ISSN 0022-0981, more
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The endogenous rhythm of swimming activity shown by the estuarine amphipod Corophium volutator (Pallas) has been studied in animals subjected to periodic inundation under controlled laboratory conditions. A rhythm of circatidal frequency which persisted under constant conditions was recorded in animals entrained to cycles of 8-, 12- and 24-h periods, whereas animals entrained to 6-h cycles appeared to follow the entraining regimen directly, although the free running rhythm was less distinct. Cycles of 4-h period failed to induce rhythmicity. The results support the hypothesis that the endogenous oscillator has a circatidal frequency. The period for which the animals are submerged is important with regard to entrainment but the effective parameters of the imposed regimen are incompletely understood in this respect.