Abstract
The planktonic speciesBoekella propinqua, Bosmina meridionalis, andCeriodaphnia dubia were found to rise to the surface waters of Lake Taupo in peak concentrations approximately two hours after sunset; the time of the ‘rise’ varying according to the season.B. propinqua made a rapid descent from the surface, but this was not so marked for the other two species. None of the species rose to the surface at dawn. This form of behaviour differs from the migration pattern of similar species in other lakes in New Zealand, and the conclusion is drawn that the depth and transparency of lakes influence the rhythm of migration.
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