Figure 3
In stationary medium: (A) Dinoflagellates confined in the microcavity (dinoflagellate concentration was 6.4 × 104 ml−1 and recording duration was 50 s with a frame rate of 100 fps) and the main channel (dinoflagellate concentration was 5.7 × 104 ml−1 and recording duration was 100 s with a frame rate of 50 fps) slowed down before changing direction in the near-wall region. The trajectories were colored by the magnitude of their swimming velocity. (B) Dinoflagellates showed no preference of orientation, except that they moved slightly faster along the longitudinal direction in the microcavity owing to the microstructure opening. Isotropic swimming was maintained in the main channel.
