Summary
An investigation of phytoplankton in Astotin Lake was made between mid-May of 1966 and September of 1967 with particular attention to the ice-free seasons. Astotin Lake is a typical, small eutrophic, kettle lake with shallow, landlocked, hard water in the Canadian prairies. High concentrations of nutrients supported heavy blooms of blue-green algae throughout the summer. The spring communities were dominated by Asterionella formosa in 1966 and by Cyclotella meneghiniana in 1967. Oxygen depletion under ice-cover probably explains the failure of an Asterionella formosa population to appear in 1967. Deficiency of silica and a rise in water temperature apparently caused the decline of the spring pulses of diatoms. Relatively high summer water temperature favoured the blue-green algal blooms and resulted in a high concentration of organic matter. The decomposition of dead Anabaena cells played an important part in the development of subsequent waterblooms, i.e., Microcystis aeruginosa and Aphanizomenon flos-aquae. The sequence of waterblooms of those species was closely related to the change in water temperature. A flos-aquae became incompatible with M. aeruginosa when the temperature fluctuated in a wide range. Most of the non-blue green algae apparently were inhibited by these cyanophyte blooms. Great species diversity appeared intermittently between blooms and a few species of the Scenedesmaceae and the Oocystaceae were relatively compatible to these blooms.
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Part of a thesis submitted to the Department of Botany, University of Alberta, Edmondton, Alberta, in partial fulfillment of the requirements for the M. Sc. degree.
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Lin, C.K. Phytoplankton succession in a Eutrophic lake with special reference to blue-green algal blooms. Hydrobiologia 39, 321–334 (1972). https://doi.org/10.1007/BF00046648
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DOI: https://doi.org/10.1007/BF00046648