Abstract
Periphytic algae were experimentally manipulated over a 20-week period to evaluate the influence of environmental fluctuations and community age on succession and community stability. Environmental fluctuations were generated by periodically transferring artificial substrata between stations in an oligotrophic lake during 9 or 10 weeks. Developing communities exposed to induced fluctuations of two- and four-week periods did not track the fluctuations. Instead, succession was slowed and followed a trajectory intermediate between those of unmanipulated control communities representing the two extremes of the fluctuation cycles. The fluctuations favored the growth of some early successional taxa while strongly suppressing the growth of at least one late successional taxon (...)
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