By Toomas Kõiv, Ingmar Ott
This publication summarises investigations on Lake Verevi (surface 12.6 ha, suggest intensity 3.6 m), positioned within the Estonian city of Elva, initiated on account that 1929. The seventeen articles care for quite a lot of questions, beginning with a holistic evaluate of the ecological prestige, over checks of long term adjustments in biotic and abiotic stipulations and completing with proposed recovery plans. Abiotic chapters supply calculations on water and mass stability, distribution and fractions of phosphorus within the sediment, optical houses and penetration of radiation within the water column, sedimentation price through the formation of stratification, and nitrogen circulate features. a lot of these phenomena clarify the targeted environmental gains of this hugely stratified lake. long term adjustments, seasonal improvement, basic construction and source ratios inducing the distribution of species composition of assorted biota (bacterio-, phyto and zooplankton, periphyton, macrovegetation, macrozoobenthos, fish) are mentioned. an important concerns are long term investigations on a posh atmosphere, the phenomenon of partial meromixis, the outline of recovery equipment, and the lifestyles of slim microniches for plankton within the water column. the quantity firmly establishes Lake Verevi as a version method of a typical aquatic habitat, experiencing a mess of anthropogenic pressures, yet for which recovery plans goal to supply sustainable administration sooner or later.
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This ebook summarises investigations on Lake Verevi (surface 12. 6 ha, suggest intensity three. 6 m), situated within the Estonian city of Elva, initiated when you consider that 1929. The seventeen articles care for a variety of questions, beginning with a holistic review of the ecological prestige, over exams of long term alterations in biotic and abiotic stipulations and completing with proposed recovery plans.
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Additional resources for Lake Verevi, Estonia - A Highly Stratified Hypertrophic Lake (Developments in Hydrobiology)
Gidrometeoizdat, Leningrad: 27–41 [Climatic conditions of the lake. In Russian]. , 1940. Zur Kenntnis einiger Seen Ost-Eestis, insbesondere ihrer Wasserchemie. Publications of the Limnological Laboratory of the Natural Resources Research Institute of Estonia 2: 1–167. , K. Ott & T. No˜ges, 2005. Nitrogen dynamics in steeply stratiﬁed temperate Lake Verevi, Estonia. Hydrobiologia 547: 63–71. , 1987. The interactions between lake and groundwater and their ecological signiﬁcance. Stygologia 3: 1–23.
Bostro¨m, M. Dinka, K. Pettersson, R. Pucsko & M. Sager, 1988. Fractionation of phosphorus in suspended matter and sediment. Archiv fu¨r Hydrobiologie – Advances in Limnology 30: 98–103. , T. Ma¨gi, J. U¨tsi, H. Ma¨emets, A. Lindpere & A. Ma¨emets, 1991. Po˜hjasetted. In: Timm, H. ), State of Lake Verevi. Hydrobiological Researches 17: 22–33. (Bottom sediments. In Estonian). , 2000. Potentially mobile phosphorus in Lake Erken sediment. Water Research 34: 2037–2042. This page intentionally blank Hydrobiologia (2005) 547:41–49 I.
1988) separates this fraction into BD-RP (phosphorus adsorbed to iron) and NaOH-RP (Al-bound P). In the sediment of Lake Verevi BD-RP formed larger fraction than NaOH-RP. , 1982). In addition, in a reaction between Fe2+ and S2) FeS can be formed which is highly a insoluble compound in natural conditions and hence inactivates iron. The mass ratio between active iron and phosphorus may be critical for phosphorus release if the sediment is oxidized or shifts from reduced conditions to oxidized status.