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Conclusion

Phytoplankton density and biomass contributed to resuspended sediment and to inhibit light transmission in the beginning of the season, but declined during the summer. In the end of the season, the total amount of resuspended sediment consisted mostly of detritus material and inorganic solids. But, even if phytoplankton biomass was lower in the end of the season, it still contributed in large extend to inhibit light transmission.

 Zooplankton density affected phytoplankton biomass by grazing, when grazing pressure was 100 % or more of phytoplankton biomass. Zooplankton density in general did not seem to be affected by temporary high turbidity, but some Cladocerans were more sensitive to disturbances.

The variable that contributed mostly to turbidity and inhibited light transmission in L. Tåkern 2016 in general was phytoplankton biomass and amount of detritus material.

Light transmission in shallow, eutrophic lakes is affected by several variables. Other than the variables studied in this study, this years’ water levels were unusually low in L. Tåkern. This do have contributed to re-establishment of submerged vegetation.


Responsible for this page: Agneta Johansson
Last updated: 05/28/17