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The Variability of Lake Water Chemistry in the Bory Tucholskie National Park (Northern Poland)

1
Institute of Land Improvement, Environmental Development and Geodesy, Faculty of Environmental Engineering and Spatial Management, Poznań University of Life Sciences, Piątkowska 94, 60-649 Poznań, Poland
2
Institute of Physical Geography and Environmental Planning, Adam Mickiewicz University, Bogumiła Krygowskiego 10, 61-680 Poznań, Poland
3
Institute of Geology, Faculty of Geographical and Geological Sciences, Adam Mickiewicz University, Bogumiła Krygowskiego 12, 61-680 Poznań, Poland
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 394; https://doi.org/10.3390/w12020394
Received: 30 December 2019 / Revised: 25 January 2020 / Accepted: 29 January 2020 / Published: 1 February 2020
(This article belongs to the Section Aquatic Systems—Quality and Contamination)
The paper presents the results of chemical analysis of lake waters in Bory Tucholskie National Park (BTNP). The BTNP area is unique due to its location within a single catchment and high variability in geological structure. Moreover, the lakes have different morphometric parameters, represent different hydrological types, trophic types and thermal regimes. Another unique feature is the existence of five lobelia lakes. This name comes from the Latin name of the taxon – Lobelia dortmanna L. which has been included in the Polish Red Data Book of Plants. The chemical analysis included 55 parameters, within macro elements (MEs), trace elements (TEs) and rare earth elements (REEs). Low concentrations of MEs, TEs and REEs confirm the absence of anthropogenic pressure. High variation of ME, TE and REE contents between individual lakes is due to different geological structure. The cluster analysis enabled lakes to be divided into six groups taking into account all analyzed water quality parameters. The lobelia lakes were characterized by the lowest concentrations of MEs and REEs, which mainly result from the small catchment area and their mainly endorheic character. The highest variability of MEs, TEs and REEs occurred in endorheic lakes, where the geological structure was dominant. The lowest variability of MEs, TEs and REEs occurred in the lakes connected by the Struga Siedmiu Jezior stream. The analysis of MEs, TEs and REEs in relation to the environmental factors and trophic, hydrologic and thermal typology allowed a better understanding of their spatial distribution in the BTNP lakes. The obtained results indicate that the values of the studied elements were generally close to the average values noted in surface waters according to the Geochemical Atlas of Europe. View Full-Text
Keywords: National Park; lake; water chemistry; macro elements (MEs); trace elements (TEs); rare earth elements (REEs) National Park; lake; water chemistry; macro elements (MEs); trace elements (TEs); rare earth elements (REEs)
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Sojka, M.; Choiński, A.; Ptak, M.; Siepak, M. The Variability of Lake Water Chemistry in the Bory Tucholskie National Park (Northern Poland). Water 2020, 12, 394.

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