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Sedimentation rate of seston during the formation of temperature stratification after ice break-up in the partly meromictic Lake Verevi

  • Ingmar Ott
  • Aimar Rakko
  • Diana Sarik
  • Peeter Nõges
  • Katrin Ott
Chapter
  • 275 Downloads
Part of the Developments in Hydrobiology book series (DIHY, volume 182)

Abstract

The small strongly stratified hard-water hypertrophic lake Verevi (max. depth 11.0 m, surface area 12.6 ha, mean depth 3.6 m) was investigated in 2000 and in 2001. The lake is sheltered from winds, and the role of waves in mixing the water column is minimal. Eutrophication favours the strengthening of stratification. Early warm springs cause a fast stagnation of the water column forming partly meromictic conditions. Seston content of water and in sediment traps in 3 layers was measured several times during the formation of stratification. Besides measuring particulate matter, in 2001, the nutrient content of the trapped sediment was analysed. During the first 7 days of the investigation, 30% of the total particle sedimentation took place. The sedimentation rate of particulate matter was 0.4–6.3 g m−2 d−1 dry weight in different layers of the water column. Daily average sedimentation loss rate was 27% of the total amount of seston of the epilimnion, whilst from the meta- and hypolimnion the settling was much slower (9.6 and 7.3%, respectively). In our experiments with twin sediment traps, to one of which formaldehyde was added, the PO{sk4/3−}-P concentration was 19% smaller in the trap without formaldehyde, probably due to planktonic uptake. The relationship between primary and export production is loop-like. The shape was irregular, indicating a high grazing rate of zooplankton.

Key words

partly meromictic lake spring sedimentation rate primary production export production plankton dynamics 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Ingmar Ott
    • 1
  • Aimar Rakko
    • 1
  • Diana Sarik
    • 1
  • Peeter Nõges
    • 1
  • Katrin Ott
    • 1
  1. 1.Institute of Zoology and BotanyEstonian Agricultural UniversityRannu, Tartu CountyEstonia

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