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Long- and short-term changes of the macrophyte vegetation in strongly stratified hypertrophic Lake Verevi

  • Helle Mäemets
  • Lilian Freiberg
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  • 282 Downloads
Part of the Developments in Hydrobiology book series (DIHY, volume 182)

Abstract

The aim of study was to bring out changes in the macrophyte vegetation, caused by eutrophication, short-term lowering of the water level and the following restoration of equilibrium in L. Verevi. Also biomass and N and P content of shoots of main submergent species were studied in 1999–2001, to follow the temporal and specific differences. Due to strong eutrophication, the type of the lake changed from a Myriophyllum-Potamogeton-Charophyta lake to a Ceratophyllum-Lemna trisulca lake in 1984–1988, obviously owing to the formation of loose organic-rich sediment. Water lowering by 0.7 m during summer months of 1998 facilitated mineralization of sediments, as a consequence of which a mass development of Ranunculus circinatus and a temporary increase in the abundance and biomass of other nutrient-demanding species took place during following years. Our data suggest differences in nutrient supply and release of submerged species and the need for more species-related approach to this group. The problem of nutrient supply of unrooted plants at the time of stratification arises. Regarding the increase of biomass of Ceratophyllum demersum in second half of summer, we suppose that one part of nutrients for this growth may derive from freshly decayed filamentous algae or vascular plants.

Key words

biomass Ceratophyllum demersum replace of dominants re-establishing tissue N and P 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Helle Mäemets
    • 1
  • Lilian Freiberg
    • 1
  1. 1.Institute of Zoology and BotanyEstonian Agricultural UniversityRannu, Tartu CountyEstonia

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