Figure 2

Larval and postlarval concentrations of Ophiocomina nigra, and larval concentrations of Ophiothrix fragilis and Amphiura filiformis at three depths in the bay of Douarnenez in relation to diel and tidal cycles. (a–d) Surface (3 m), (e–h) mid-depth (10–12 m), and (i–l) bottom (24–26 m). The black line represents the water level (m). Horizontal black and white bars indicate nighttime and daytime, respectively. The proportion of the different developmental stages is indicated.