Elemental and fatty acid composition of snow algae in Arctic habitats
Red, orange or green snow is the macroscopic phenomenon comprising different eukaryotic algae. Little is known about the ecology and nutrient regimes in these algal communities. Therefore, eight snow algal communities from five intensively tinted snow fields in western Spitsbergen were analysed for...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:36407 2023-07-23T04:18:09+02:00 Elemental and fatty acid composition of snow algae in Arctic habitats Spijkerman, Elly (PD Dr.) Wacker, Alexander (Prof. Dr.) Weithoff, Guntram Leya, Thomas 2012 https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36407 https://doi.org/10.3389/fmicb.2012.00380 eng eng https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36407 https://doi.org/10.3389/fmicb.2012.00380 info:eu-repo/semantics/closedAccess Institut für Biochemie und Biologie article doc-type:article 2012 ftubpotsdam https://doi.org/10.3389/fmicb.2012.00380 2023-07-02T22:33:32Z Red, orange or green snow is the macroscopic phenomenon comprising different eukaryotic algae. Little is known about the ecology and nutrient regimes in these algal communities. Therefore, eight snow algal communities from five intensively tinted snow fields in western Spitsbergen were analysed for nutrient concentrations and fatty acid (FA) composition. To evaluate the importance of a shift from green to red forms on the FA-variability of the field samples, four snow algal strains were grown under nitrogen replete and moderate light (+N+ML) or N-limited and high light (-N+HL) conditions. All eight field algal communities were dominated by red and orange cysts. Dissolved nutrient concentration of the snow revealed a broad range of NH4+ (<0.005-1.2 mg NI-1) and only low PO43- (< 18 mu g P I-1) levels. The external nutrient concentration did not reflect cellular nutrient ratios as C:N and C:P ratios of the communities were highest at locations containing relatively high concentrations of NH4- and PO43-. Molar N:P ratios ranged from 11 to 21 and did not suggest clear limitation of a single nutrient. On a per carbon basis, we found a 6-fold difference in total FA content between the eight snow algal communities, ranging from 50 to 300 mg FA g C-1. In multivariate analyses total FA content opposed the cellular N:C quota and a large part of the FA variability among field locations originated from the abundant FAs C181n-9, C18 2n-6, and C183n-3. Both field samples and snow algal strains grown under -N+HL conditions had high concentrations of C181n-9. FAs possibly accumulated due to the cessation of growth. Differences in color and nutritional composition between patches of snow algal communities within one snow field were not directly related to nutrient conditions. We propose that the highly patchy distribution of snow algae within and between snow fields may also result from differences in topographical and geological parameters such as slope, melting water rivulets, and rock formation. Article in Journal/Newspaper Arctic Spitsbergen University of Potsdam: publish.UP Arctic Frontiers in Microbiology 3 |
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Open Polar |
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University of Potsdam: publish.UP |
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ftubpotsdam |
language |
English |
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Institut für Biochemie und Biologie |
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Institut für Biochemie und Biologie Spijkerman, Elly (PD Dr.) Wacker, Alexander (Prof. Dr.) Weithoff, Guntram Leya, Thomas Elemental and fatty acid composition of snow algae in Arctic habitats |
topic_facet |
Institut für Biochemie und Biologie |
description |
Red, orange or green snow is the macroscopic phenomenon comprising different eukaryotic algae. Little is known about the ecology and nutrient regimes in these algal communities. Therefore, eight snow algal communities from five intensively tinted snow fields in western Spitsbergen were analysed for nutrient concentrations and fatty acid (FA) composition. To evaluate the importance of a shift from green to red forms on the FA-variability of the field samples, four snow algal strains were grown under nitrogen replete and moderate light (+N+ML) or N-limited and high light (-N+HL) conditions. All eight field algal communities were dominated by red and orange cysts. Dissolved nutrient concentration of the snow revealed a broad range of NH4+ (<0.005-1.2 mg NI-1) and only low PO43- (< 18 mu g P I-1) levels. The external nutrient concentration did not reflect cellular nutrient ratios as C:N and C:P ratios of the communities were highest at locations containing relatively high concentrations of NH4- and PO43-. Molar N:P ratios ranged from 11 to 21 and did not suggest clear limitation of a single nutrient. On a per carbon basis, we found a 6-fold difference in total FA content between the eight snow algal communities, ranging from 50 to 300 mg FA g C-1. In multivariate analyses total FA content opposed the cellular N:C quota and a large part of the FA variability among field locations originated from the abundant FAs C181n-9, C18 2n-6, and C183n-3. Both field samples and snow algal strains grown under -N+HL conditions had high concentrations of C181n-9. FAs possibly accumulated due to the cessation of growth. Differences in color and nutritional composition between patches of snow algal communities within one snow field were not directly related to nutrient conditions. We propose that the highly patchy distribution of snow algae within and between snow fields may also result from differences in topographical and geological parameters such as slope, melting water rivulets, and rock formation. |
format |
Article in Journal/Newspaper |
author |
Spijkerman, Elly (PD Dr.) Wacker, Alexander (Prof. Dr.) Weithoff, Guntram Leya, Thomas |
author_facet |
Spijkerman, Elly (PD Dr.) Wacker, Alexander (Prof. Dr.) Weithoff, Guntram Leya, Thomas |
author_sort |
Spijkerman, Elly (PD Dr.) |
title |
Elemental and fatty acid composition of snow algae in Arctic habitats |
title_short |
Elemental and fatty acid composition of snow algae in Arctic habitats |
title_full |
Elemental and fatty acid composition of snow algae in Arctic habitats |
title_fullStr |
Elemental and fatty acid composition of snow algae in Arctic habitats |
title_full_unstemmed |
Elemental and fatty acid composition of snow algae in Arctic habitats |
title_sort |
elemental and fatty acid composition of snow algae in arctic habitats |
publishDate |
2012 |
url |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36407 https://doi.org/10.3389/fmicb.2012.00380 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Spitsbergen |
genre_facet |
Arctic Spitsbergen |
op_relation |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36407 https://doi.org/10.3389/fmicb.2012.00380 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.3389/fmicb.2012.00380 |
container_title |
Frontiers in Microbiology |
container_volume |
3 |
_version_ |
1772180313082953728 |