Holocene phototrophic community and anoxia dynamics in meromictic Lake Jaczno (NE Poland) using high-resolution hyperspectral imaging and HPLC data
| Autor: | Hendrik Vogel, Luyao Tu, Andrea Lami, Martin Grosjean, Wojciech Tylmann, Stamatina Makri |
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| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
010504 meteorology & atmospheric sciences lcsh:Life Stratification (water) 01 natural sciences lcsh:QH540-549.5 Purple sulfur bacteria 14. Life underwater 910 Geography & travel Ecology Evolution Behavior and Systematics Holocene 550 Earth sciences & geology 0105 earth and related environmental sciences Earth-Surface Processes Trophic level 2. Zero hunger biology Aquatic ecosystem lcsh:QE1-996.5 Hypoxia (environmental) 15. Life on land biology.organism_classification Anoxic waters lcsh:Geology lcsh:QH501-531 Oceanography 13. Climate action Environmental science lcsh:Ecology Eutrophication |
| Zdroj: | Makri, Stamatina; Lami, Andrea; Tu, Luyao; Tylmann, Wojciech; Vogel, Hendrik; Grosjean, Martin (2021). Holocene phototrophic community and anoxia dynamics in meromictic Lake Jaczno (NE Poland) using high-resolution hyperspectral imaging and HPLC data. Biogeosciences, 18(5), pp. 1839-1856. Copernicus Publications 10.5194/bg-18-1839-2021 Biogeosciences, Vol 18, Pp 1839-1856 (2021) |
| ISSN: | 1726-4189 |
| DOI: | 10.5194/bg-2020-362 |
| Popis: | Global spread of hypoxia and less frequent mixing in lakes is a major growing 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 multiproxy approach combining high-resolution bulk pigment data measured by hyperspectral imaging (HSI) with lower-resolution specific chlorophyll types and carotenoids measured by HPLC to examine Holocene trophic state changes and anoxia evolution in the 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 were 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. |
| Databáze: | OpenAIRE |
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