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- W1974119804 abstract "Abstract The intertidal gastropod Hydrobia ulvae was subjected experimentally in undisturbed core samples to different combinations of the presence or absence of light and of cover by seawater. As displayed in the field, a greater proportion of snails were active in the dark than in the light, and when covered by water as opposed to being provided only with a damp sediment surface. A slight, but significant, rhythmic change in activity levels, with a period averaging 24·5 h, was shownby animals maintained under conditions of constant darkness and of damp sediment surface. Peak activity in this rhythm, which is equivalent to only 1·3–1·6 times minimum levels, did not coincide with the peaks of activity displayed during the more marked rhythmic response of H. ulvae to natural fluctuations in light intensity and tidal water cover, however, and this presumed endogenous rhythm does not appear to contribute to such rhythmic activity in the field. Increased proportional activity in nature is suggested to be most likely a direct response to changes in ambient light intensity and to the presence or absence of water cover." @default.
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- W1974119804 date "1986-03-01" @default.
- W1974119804 modified "2023-09-26" @default.
- W1974119804 title "Daily activity rhythms in the intertidal gastropod Hydrobia ulvae (Pennant)" @default.
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- W1974119804 doi "https://doi.org/10.1016/0272-7714(86)90046-6" @default.
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