Fig. 5.

Proliferation of compatible algae in larvae. In each of three experiments, freshly collected larvae (<1 day old) were exposed to compatible algal strains for 8 days, at which time larvae were transferred to algae-free filter-sterilized artificial seawater (FASW, arrow indicates algae wash-out) and maintained without added algae for the duration of the experiment. At the indicated times, the percentage of larvae containing ≥1 algal cell (A) and the number of algal cells in the larvae containing ≥1 algal cell were scored as in Fig. 2. Means ± s.e.m. for the three experiments are shown; the number of larvae scored in B was 21–63 per strain per time point. Significant increases in algal number could be seen for both algal strains between 8 and 21 days (a, P≈0.01; b, P≈0.02).