scholarly journals Supplementary material to "Holocene phototrophic community and anoxia dynamics in meromictic Lake Jaczno (NE Poland) using high-resolution hyperspectral imaging and HPLC data"

2020 ◽  
Author(s):  
Stamatina Makri ◽  
Andrea Lami ◽  
Luyao Tu ◽  
Wojciech Tylmann ◽  
Hendrik Vogel ◽  
...  
Keyword(s):  
High Resolution ◽  
Hyperspectral Imaging ◽  
Meromictic Lake ◽  
Ne Poland ◽  
Supplementary Material ◽  
Phototrophic Community ◽  
Hplc Data

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

2020 ◽  
Author(s):  
Stamatina Makri ◽  
Andrea Lami ◽  
Luyao Tu ◽  
Wojciech Tylmann ◽  
Hendrik Vogel ◽  
...  
Keyword(s):  
High Resolution ◽  
Human Impact ◽  
Hyperspectral Imaging ◽  
Environmental Concern ◽  
Human Impacts ◽  
Meromictic Lake ◽  
Purple Sulfur Bacteria ◽  
Ne Poland ◽  
Sulfur Bacteria ◽  
Phototrophic Community

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.

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

2021 ◽  
Vol 18 (5) ◽  
pp. 1839-1856
Author(s):  
Stamatina Makri ◽  
Andrea Lami ◽  
Luyao Tu ◽  
Wojciech Tylmann ◽  
Hendrik Vogel ◽  
...  
Keyword(s):  
High Resolution ◽  
Human Impact ◽  
Hyperspectral Imaging ◽  
Environmental Concern ◽  
Human Impacts ◽  
Meromictic Lake ◽  
Purple Sulfur Bacteria ◽  
Ne Poland ◽  
Sulfur Bacteria ◽  
Phototrophic Community

Abstract. 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.

scholarly journals Supplementary material to "The aerosol-cyclone indirect effect in observations and high-resolution simulations"

2017 ◽  
Author(s):  
Daniel T. McCoy ◽  
Paul R. Field ◽  
Anja Schmidt ◽  
Daniel P. Grosvenor ◽  
Frida A.-M. Bender ◽  
...  
Keyword(s):  
High Resolution ◽  
Indirect Effect ◽  
Supplementary Material
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