FIG. 6.

Colonization by newcomer strain 11 of agar particles that had been precolonized by resident strain 13 (initial abundances 0.29 and 3.06 × 10⁶ cells sphere⁻¹). Clean agar particles were used as controls. (a) Abundance of newcomer strain 11 on precolonized particles and clean particles; (b) abundance of resident strain 13.