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https://doi.org/10.5194/bg-2020-362
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-362
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  22 Oct 2020

22 Oct 2020

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This preprint is currently under review for the journal BG.

Holocene phototrophic community and anoxia dynamics in meromictic Lake Jaczno (NE Poland) using high-resolution hyperspectral imaging and HPLC data

Stamatina Makri1, Andrea Lami2, Luyao Tu1, Wojciech Tylmann3, Hendrik Vogel4, and Martin Grosjean1 Stamatina Makri et al.
  • 1Institute of Geography & Oeschger Centre for Climate Change Research, University of Bern, Hallerstrasse 12, 3012 Bern, Switzerland
  • 2ISE-CNR Institute of Ecosystem Study, 50 Largo Tonolli, 28922 Verbania Pallanza, Italy
  • 3Faculty of Oceanography and Geography, University of Gdansk, Bazynskiego 4, PL-80952 Gdansk, Poland
  • 4Institute of Geological Sciences & Oeschger Centre for Climate Change Research, University of Bern, 3012, Bern, Switzerland

Abstract. Global spread of hypoxia and altered mixing regimes in freshwater systems is a growing major environmental concern. Climate change and human impact are expected to increasingly deteriorate aquatic ecosystems. The study of processes and drivers of such changes in the past provides a great asset for prevention and remediation in the future. We used a multi-proxy approach combining high-resolution Hyperspectral Imaging (HSI) pigment data, with specific HPLC chlorophylls and carotenoids to examine Holocene trophic state changes and anoxia evolution in meromictic Lake Jaczno, NE Poland. A redundancy analysis RDA including pollen-inferred vegetation cover, temperature and human impacts provides insight into specific conditions and drivers of changing trophic and redox states in the lake. Anoxic and sulfidic conditions established in Lake Jaczno after initial basin infilling 9500 years ago. Until 6700 cal BP, lake trophy was relatively low, water turbidity was high, and green sulfur bacteria (GSB) were abundant within the phototrophic community, suggesting a deep oxic–anoxic boundary and weak stratification. The period between 6700–500 cal BP is characterized by constantly increasing lake production and a gradual shift from GSB to purple sulfur bacteria (PSB), suggesting a shallower oxic–anoxic boundary and pronounced stratification. Yet, the presence of spheroidene and speroidenone in the sediments indicates intermittent anoxia. After 500 cal BP, increasing human impact, deforestation and intensive agriculture promoted lake eutrophication, with a shift to PSB dominance and establishment of permanent anoxia and meromixis. Our study unambiguously documents the legacy of human impact on processes determining eutrophication and anoxia.

Stamatina Makri et al.

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Short summary
Anoxia in lakes is a major growing concern. In this study we applied a multi-proxy approach combining high-resolution Hyperspectral Imaging (HSI) pigment data with specific HPLC data to examine the Holocene evolution and main drivers of lake anoxia and trophic state changes. Our findings show that when human impact was low, these changes were driven by climate and natural lake–catchment evolution. In the last 500 years, increasing human impact promoted lake eutrophication and permanent anoxia.
Anoxia in lakes is a major growing concern. In this study we applied a multi-proxy approach...
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