Fig. 5.

Physiological traits predict the population-density dependence of growth on chitin particles by psych6C06 in a diffusive environment. (A) Summary of measurements made to parameterize the population-level bottom-up model of psych6C06 growth on chitin. The key parameter for each process is given in parentheses: K_on, rate of cell attachment to particles (SI Appendix, Fig. S10B); K_off, rate of cell detachment from particles (SI Appendix, Fig. S10C); K_p, rate of GlcNAc release by cell-associated chitinase (SI Appendix, Fig. S10D); Y, the yield of GlcNAc conversion to biomass during carbon-limited growth (SI Appendix, Fig. S10F); K_s, Monod half-saturation constant for GlcNAc (SI Appendix, Fig. S10G); µ_max, maximum growth rate on GlcNAc (SI Appendix, Fig. S10G). wt/wt, ratio of weights. (B) Prediction of the fold change in biomass of psych6C06 populations after 24 h of growth on a chitin surface with an analytical model based on psych6C06 physiological the parameters measured in SI Appendix, Fig. S10 (gray points). Black data points show the experimentally measured change in biomass from Fig. 3A. Dotted horizontal line indicates no biomass change. Error bars represent SEM from at least 3 measurements of particle colonization density.