1. The successful species of copepods in a brackish water habitat show a separation in time with regard to the date of maximum occurrence and the date of maximum reproductive activity. The succession of the five species examinated is: Mesochra lilljeborgi, Paronychocamptus nanus, Tachidius discipes, Halicyclops magniceps and Canuella perplexa.2. These species and others show moreover a separation in space: C. perplexa is an endopsammic, P. nanus a mesopsammic and T. discipes an epipsammic species. Three cyclopoid species are planktonic. Two other species (Nitocra typica and Mesochra lilljeborgi are more numerous in the perophyton than in the benthos. 3. It seems that redundancy exists in the ways these species avoid competition, and the habitat could probably support more species.
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