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Abstract
The zooplankton of seven high altitude lakes in the Sierra Nevada, California, were sampled for three to six years. Periodic pH depression occurs in the lakes during spring snowmelt and infrequent, intense summer rains. The lakes contained many crustaceans and rotifers known or suspected to be acid intolerant, such as Daphnia rosea, Daphnia middendorffiana, Diaptomus signicauda, Conochilus unicornis, and Polyarthra vulgaris. Macrocyclops albidus, Bosmina longirostris and Diaptomus signicauda were the crustaceans most frequently encountered during snowmelt, while Polyarthra vulgaris, Keratella quadrata and Keratella taurocephala were the most fre- quently encountered rotifers. In several lakes, the zooplankton was numerically dominated by known acid resistant species during snowmelt (e.g. B. longirostris and H. gibberum). Daphnia rosea was found during snowmelt only three times during the entire study. Seasonal variation in species richness occurred in some of the lakes. No longterm trends in species richness were observed
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