Dynamics of protist communities have been studied on the surface of the sediment and adjacent zone at three coastal water areas of the Cantabric Sea, i.e., ciliates, flagellates, dinoflagellates, oligotrichs, tintinnids and amoebae. Data concerning abundance and number of species show
important differences between the three study sites. Variables between samples taken during the whole year indicate that there is characteristic dynamics for each area that may be related to differences in sediment characteristics, tidal activity and wave action.
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