Figure 8. Conceptual model of vertical migration in Rhizosolenia mats and other giant phytoplankton.

In this simplified representation, depth intervals are given in only general terms to allow for significant life history variations in the various taxa noted in the text. Data sources: rate measurements supporting time at depth (Richardson et al., 1996), surface photosynthetic rates (Villareal et al., 1996), NO₃⁻ assimilation (Joseph, Villareal & Lipschultz, 1997), ascent rates (Moore & Villareal, 1996a; Moore & Villareal, 1996b).