"Normal" swimming in marine and freshwater zooplankton is often intermittent with active upward and more passive downward displacements. In the freshwater cladoceran Daphnia, the pattern is sometimes regular enough to demonstrate the presence of a rhythm. Abnormal swimming patterns were also described. For example, large amplitude oscillations occur or animals may stay for a long time at the lighted side of a tube and then move suddenly away from light. A model, consisting of a coupled oscillator, was developed, that describes these "normal" and abnormal swimming patterns. This could be achieved by varying the strength of the coupling only
Original languageEnglish
Pages (from-to)225-241
JournalNetherlands Journal of Zoology
Issue number2-4
StatePublished - 2003

ID: 254558