Sediment diatom assemblages and composition of pore-water dissolved organic matter reflect recent eutrophication history of lake peipsi (Estonia/Russia)

Heinsalu, Atko; Alliksaar, Tiiu; Leeben, Aina; Nõges, Tiina

doi:10.1007/978-1-4020-6399-2_13

Cited by 5 publications

(6 citation statements)

References 24 publications

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“…Our calculations showed that the decrease of porosity from 95% to 88% was related to a 2.5-fold compaction of sediments and thus the expulsion of interstitial fluid was up to 60%. The decreasing and stabilizing of the values of porosity are in good correspondence with the changes in Eh (revealed as notable changes in sediment colour) (Heinsalu et al, 2007), and in the chemical composition of pore-water pigments and dissolved organic matter (Leeben et al, 2008). Our data showed also a sharp decline in the P content towards the surface from the layers where the porosity exceeded 88%.…”

Section: Phosphorus Balancesupporting

confidence: 69%

Phosphorus flux in Lake Peipsisensu stricto, Eastern Europe

Punning¹,

Kapanen²

2009

Estonian J. Ecol.

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Phosphorus distribution in sediments and monitoring data from Lake Peipsi sensu stricto (s.s.) were used to elucidate the distribution of P fractions in the lithological and geochemical composition of the lake's sediments. The composition of P fractions in the sediment cores was rather constant in layers with porosity lower than 88%. The decay of biota during the compression and genesis of sediments leading to the liberation of P to interstitial water and its further diffusion along the concentration gradient towards the sediment-water surface are directed by environmental conditions. During phytoplankton blooms the release of P fractions from sediments may be as high as 875 tonnes of P in Lake Peipsi s.s. Calculations show that the average annual total P accumulation in Lake Peipsi s.s. is ca 270 mg m -2 y -1 .

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Section: Phosphorus Balancesupporting

confidence: 69%

Phosphorus flux in Lake Peipsisensu stricto, Eastern Europe

Punning¹,

Kapanen²

2009

Estonian J. Ecol.

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“…The 210 Pb dates for sediment cores of other lakes confirm this age (e.g. Heinsalu et al 2007). The following rise in SFAP abundance coincides with the establishment of two large power plants in Narva in 1960 and1969.…”

Section: Resultssupporting

confidence: 50%

“…This is clearly visible in the sediment SFAP distribution curve of Lake Kooraste Kõverjärv, where particle concentration decreases substantially in the uppermost 16 cm of the core. The top sediment layer is estimated to have formed since the 1990s according to 210 Pb dates (Heinsalu et al 2007;Heinsalu & Alliksaar 2009a).…”

Section: Resultsmentioning

confidence: 99%

“…In Estonia this method has repeatedly been applied together with other dating methods (e.g. 210 Pb radiometric dating, varvochronology, marker horizons of artificial radionuclides 137 Cs, 241 Am; Punning et al 2004;Alliksaar et al 2005;Veski et al 2005;Nõges et al 2006;Heinsalu et al 2007Heinsalu et al , 2008Leeben et al 2008;Heinsalu & Alliksaar 2009a), therefore, the SFAP distribution chronology is very well established. For the SFAP analysis the sediment subsamples were treated with 30% H 2 O 2 , 3 M HCl and 0.3 M NaOH to remove organic, calcareous and biogenic siliceous material (Renberg & Wik 1985;Rose 1990).…”

Section: Methodsmentioning

confidence: 98%

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A radical shift from soft-water to hard-water lake: palaeolimnological evidence from Lake Kooraste Kõverjärv, southern Estonia

Alliksaar¹,

Heinsalu²

2011

Estonian J. Earth Sci.

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The Water Framework Directive (WFD) of the European Union requires the quality of all European water bodies to be examined, and aims to achieve good status by 2015. This study was initiated to assess whether a potential reference lake for identifying lake-type specific reference conditions meets the WFD requirements, of being minimally impacted by human activity during the last centuries. The sediments of Lake Kooraste Kõverjärv were analysed for diatom assemblages and sediment composition; past changes in the lake-water pH and total phosphorus were reconstructed, using quantitative models on sedimentary diatoms. The chronology of sediments was established, using spheroidal fly-ash particles stratigraphy. Palaeolimnological investigations, supported by information from historical maps, revealed that man-made changes around the lake have severely influenced its ecological conditions. The lake, which had been oligotrophic with soft and clear water before the mid-17th century, has been transformed into a hard-water lake by modifications to the inflow and outflow. The lake water quality has also been altered by the infiltration of nutrients from a nearby hypertrophic lake that was used for flax retting since the 19th century. Although the ecological status of the lake has remained good despite all these changes, it is still questionable whether to nominate it as a reference lake for stratified hard-water lake types

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“…Long-term variations of underwater irradiance are controlled by human impact, climate change, and water level fluctuations. The eutrophication of Estonian lakes from agricultural and point sources accelerated since the 1950s (Heinsalu et al, 2007;Heinsalu and Alliksaar, 2009) and culminated in the 1970s and 1980s (Ott and Kõiv, 1999). As a large portion of these nutrients was accumulated in lake sediments and is still supporting high primary productivity of lakes, the decreased pollution loads and use of fertilizers have not caused a corresponding improvement in the bio-optical properties of water.…”

Section: Discussionmentioning

confidence: 98%

Reconstruction of long-term changes of the underwater light field in large shallow lakes Peipsi and Võrtsjärv, North-East Europe

Toming¹,

Nõges²,

Arst³

et al. 2013

Proc. Estonian Acad. Sci.

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The main objective of our study was to reconstruct the multi-decadal changes of the underwater light field in two large, shallow and polymictic Estonian lakes Võrtsjärv and Peipsi in order (i) to assess the potential role that light limitation may have had on phytoplankton growth in the past and (ii) to get an insight into the factors driving underwater light climate in shallow turbid lakes in the long term. We reconstructed the long-term variations of the diffuse attenuation coefficient of water (K d,PAR ) in the photosynthetically active region (PAR, 400-700 nm) partly on the basis of measured beam attenuation spectra and partly using regression analysis. From K d,PAR we calculated the depth of the euphotic zone (z 1% ) and the mean light availability in the mixed layer (E mix ). The reconstructed time series of these bio-optical parameters gave a plausible picture of the long-term development of light conditions in the two lakes studied, which was in accordance with their eutrophication history and changes in their water levels. Better light availability in both lakes generally coincided with years of a low water level, and the coincidence was more distinct in the shallower Võrtsjärv. Values of E mix revealed a probable light limitation in Peipsi in autumn and in Võrtsjärv throughout the year.

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Sediment diatom assemblages and composition of pore-water dissolved organic matter reflect recent eutrophication history of lake peipsi (Estonia/Russia)

Cited by 5 publications

References 24 publications

Phosphorus flux in Lake Peipsisensu stricto, Eastern Europe

Phosphorus flux in Lake Peipsisensu stricto, Eastern Europe

A radical shift from soft-water to hard-water lake: palaeolimnological evidence from Lake Kooraste Kõverjärv, southern Estonia

Reconstruction of long-term changes of the underwater light field in large shallow lakes Peipsi and Võrtsjärv, North-East Europe

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