1887

Abstract

Migrations of ciliated protozoa between the benthos and water column of a productive lake are reversible and linked to seasonal changes in oxygen availability. Maximum densities of planktonic populations are maintained for periods of several months at depths where the oxygen concentration is l mgl or less. With the possible exception of one genus () there was no evidence for periodic vertical migration within a season. The supposed unconditional requirement for oxygen in large free-living ciliates is questioned.

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1981-03-01
2021-05-13
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