Logarithm of the densities of λ phages and of bacterial strains during competition in the unstructured habitat.

<p>Vertical axes represent the log₁₀ of the density of lysogenic rifampicin-resistant cells (thick full line with squares), of susceptible streptomycin-resistant cells (thin line with triangles), of lysogenic streptomycin-resistant cells (dotted line), and of the λ phage (filled broken line with circles), in the beginning of competitions (day 0), and after 1, 3 and 5 days of competition. Error bars as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0059043#pone-0059043-g001" target="_blank">Figure 1</a>. Open broken lines represent the expected density of λ phages if lysogenic cells were the only cells producing the phage; this is calculated assuming that there is a λ phage per 3.13×10⁴ lysogenic cells in pure cultures of lysogenic cells. In all competitions, the initial total bacterial density was around 10⁶ cells ml⁻¹. We varied the initial ratio of lysogenic to susceptible cells. A: ratio = 1∶10⁴; B: ratio = 1∶10²; C: ratio = 1∶1; D: ratio = 10²∶1; E: ratio = 10⁴∶1.