FIG. 2.

Kinetics of onset of animal luminescence as a function of V. fischeri dose. Juvenile squid were incubated for 12 h in seawater containing 40 (open diamonds), 580 (closed squares), 36,000 (open triangles), or 800,000 (closed circles) V. fischeri cells, and the development of luminescence by each animal was monitored (n = 12 for each dose). Mean luminescence levels of those animals that became colonized are reported in relative light units. Values below about 10³ units indicate no detectable light production. Error bars depict the standard errors of the means.