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====Effects of Mixed Cultures on Growth====

Cell growth can also be influenced by the presence of other microorganisms, such as lactic acid bacteria, ''Saccharomyces'' and ''Brettanomyces''. One study by Hübbe showed that ''L. brevis'' and ''L. parabrevis'' grew to the normal high cell counts when grown individually and without competition. When co-fermented with ''Brettanomyces'', the cell count of ''L. brevis'' was halved, and the growth rate of ''L. parabrevis'' was greatly diminished to about 15-20%, indicating that the ability of ''Lactobacillus'' to compete with ''Brettanomyces'' is species dependent. The pitching rate of ''Brettanomyces'' was also tested, and seemed to not have an effect on the ''Lactobacillus'' growth. When co-fermented with both ''S. cerevisiae'' and ''Brettanomyces'', the ''Lactobacillus'' growth was greatly diminished to about 2-13% of what the normal cell growth was without competition. This appears to correspond with anecdotal reports from brewers that some ''Lactobacillus'' species/strains do not compete well with yeast, especially ''S. cerevisiae''. The growth of ''Brettanomyces'', however, was not affected by the presence of ''Lactobacillus'' <ref name="Hubbe">[https://www.facebook.com/groups/MilkTheFunk/1407620509266159/ Effect of mixed cultures on microbiological development in Berliner Weisse (master thesis). Thomas Hübbe. 2016.]</ref>.