Aarhus University Seal / Aarhus Universitets segl

Erik Jeppesen

Lake Søbygaard: a shallow lake in recovery after a reduction in phosphorus loading

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review


  • M. Sc Søndergaard, Botanical Institute
  • ,
  • E. Jeppesen
  • O. Sortkjaer, The Freshwater Laboratory, Environmental Protection Agency

The development and recovery of a shallow and hypertrophic lake following a reduction in the external phosphorus load has been documented. In spite of this reduction, phosphorus concentrations and phytoplankton biomass in the lake water are still very high. The reason for this development can be explained by three main factors: (1): the sediment has been accumulating a large phosphorus pool which is now causing a high internal phosphorus load, (2) due to the shallow conditions, resuspension of the upper sediment often takes place because of wind action and thereby increases the phosphorus loading from the sediment, (3) the development of a large population of planktivorous fish decreases the zooplankton biomass resulting in the development of a large phytoplankton biomass.

Original languageEnglish
Pages (from-to)381-384
Number of pages4
Publication statusPublished - 1 Apr 1987
Externally publishedYes

See relations at Aarhus University Citationformats

ID: 140096280