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Hydrobiologia

, Volume 50, Issue 2, pp 177–189 | Cite as

Limnology of Shagawa Lake, Minnesota, prior to reduction of phosphorus loading

  • D. P. Larsen
  • K. W. Malueg
Article

Abstract

Various limnological parameters have been measured in Shagawa Lake, a culturally eutrophic lake in northeastern Minnesota, from 1970–1972. These included temperature; specific conductance; dissolved oxygen; alkalinity; pH; total and orthophosphate phosphorus; nitrate, nitrite and ammonia nitrogen; chlorophyll a; transparency; major cations; and selected trace elements. The lake exhibited many characteristics of high productivity. Concentrations of chlorophyll a reached 60 µg/l during summer months and were reflected in pH values in excess of 9. Anaerobic conditions developed during both summer and winter and, during these intervals, large pools of available nutrients developed in the lower waters. Manganese and iron concentrations varied greatly as a consequence of changes in the oxygen regime. Major cations and other trace elements showed no yearly pattern.

Keywords

Shagawa Lake Limnology phosphorus Loading 

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Copyright information

© Dr. W. Junk b. v. Publishers 1976

Authors and Affiliations

  • D. P. Larsen
    • 1
  • K. W. Malueg
    • 1
  1. 1.U.S. Environmental Protection AgencyCorvallis

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