Abstract
Regulation of community structure was studied in an oligotrophic lake through experiments involving convergence of attached microalgal communities with initially differing structures. Convergence of a control and two experimental communities indicated that community structure was regulated, apparently toward a single, highly dynamic equilibrium. The rate of convergence was similar in the two experiments, and thus was independent of initial community structure. This rate was commensurate with average cell division rates measured independently. The estimated «characteristic response time», an aggregated community parameter, was 11 wk, indicating that the community could track yearly cyclical environmental variation, albeit with a lag
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