Protozoan feeding and bacterial wall growth

Area of Science:

• Microbial Ecology
• Mathematical Biology
• Population Dynamics

Background:

• Monod's model is commonly used to describe protozoan feeding kinetics on bacteria in chemostats.
• Previous research identified discrepancies between Monod's model predictions and observed minimum bacterial densities.
• An earlier study resolved this by replacing Monod's model with an alternative.

Purpose of the Study:

• To investigate an alternative explanation for the discrepancy between Monod's model and observed data.
• To determine if retaining Monod's model is possible by incorporating additional factors.

Main Methods:

• Mathematical modeling of protozoan-bacterial interactions in a chemostat.
• Inclusion of bacterial growth on chemostat walls into the existing model equations.
• Comparison of model predictions with experimental data from previous studies.

Main Results:

• The discrepancy between Monod's model predictions and observed minimum bacterial densities can be resolved.
• This resolution is achieved by incorporating bacterial growth on chemostat walls into the model.
• The original Monod's model for the feed relation can be retained.

Conclusions:

• Bacterial growth on chemostat walls is a significant factor influencing population dynamics.
• This factor provides an alternative explanation for previously observed discrepancies in chemostat models.
• The findings suggest a refinement of chemostat modeling without discarding the established Monod's model.