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Abstract
The seasonal changes in flora and fauna in an aestival pond in central Alberta, Canada, were studied through a complete annual cycle during which an exceptional decrease in water volume occurred in response to lower than normal rainfall. Substantial changes took place between successive summers in the species composition of the phytoplankton, Rotifera, Oligochaeta, Copepoda and Zygoptera. Some of the incoming species, particularly Chaetogaster diaphanus (Oligochaeta) and three species of Lestes (Zygoptera) are often associated with more temporary habitats of the region. The instability of species composition and productivity of the community is discussed in terms of the trophic position of aestival lakes and ponds.
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