Abstract
We report diurnal changes in vertical distribution ofDaphnia longispina andD. magna in shallow (25–60 cm) rock-pools on Baltic islands, southern Finland. During the daytime shallow rock-poolDaphnia reside in water layers close to the sediment while at midnight they either are evenly distributed throughout the water column, or have a modal peak of distribution in the surface water. Contrary to this pattern, no changes were observed in vertical distribution ofD. longispina at noon and at midnight in a 150 cm deep pond. We suggest that the pattern ofDaphina vertical migration in shallow rock-pools is not satisfactorily explained by predation.
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Ranta, E., Nuutinen, V. Daphnia exhibit diurnal vertical migration in shallow rock-pools. Hydrobiologia 127, 253–256 (1985). https://doi.org/10.1007/BF00024229
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DOI: https://doi.org/10.1007/BF00024229