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We consider the extension of the `Moran effect', where correlated noisegenerates synchrony between isolated single species populations, to the studyof synchrony between populations embedded in multi-species communities. Inlaboratory experiments on complex microbial communities, comprising bothpredators (protozoa) and prey (bacteria), we observe synchrony in abundancesbetween isolated replicates. A breakdown in synchrony occurs for both predatorand prey as the reactor dilution rate increases, which corresponds to both anincreased rate of input of external resources and an increased effectivemortality though washout. The breakdown is more rapid, however, for the lowertrophic level. We can explain this phenomenon using a mathematical frameworkfor determining synchrony between populations in multi-species communities atequilibrium. We assume that there are multiple sources of environmental noisewith different degrees of correlation that affect the individual speciespopulation dynamics differently. The deterministic dynamics can then influencethe degree of synchrony between species in different communities. In the caseof a stable equilibrium community synchrony is controlled by the eigenvaluewith smallest negative real part. Intuitively fluctuations are minimally dampedin this direction. We show that the experimental observations are consistentwith this framework but only for multiplicative noise.

Integrating Theory and Experiment to Explain the Breakdown of Population Synchrony in a Complex Microbial Community