The characteristic pattern of multiple colored layers in coastal stratified lakes in the process of separation from the White Sea
| Autor: | T. A. Belevich, D. N. Matorin, Ludmila Efimova, Natalia M. Kokryatskaya, Anastasiia V. Kharcheva, Galina N. Losyuk, Svetlana V. Patsaeva, D. A. Todorenko, Elena D. Krasnova, D. A. Voronov |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Photosystem II biology Phototroph Chemistry 030106 microbiology Mineralogy Oceanography biology.organism_classification Chemocline Photosynthesis Anoxygenic photosynthesis 03 medical and health sciences 030104 developmental biology Algae Green sulfur bacteria Green algae Water Science and Technology |
| Zdroj: | Journal of Oceanology and Limnology. 36:1962-1977 |
| ISSN: | 2523-3521 2096-5508 |
| Popis: | An unusual feature of the saline stratified lakes that were formed due to ongoing postglacial uplift on the White Sea coast is the presence of several differently colored thin layers in the zone with sharp gradients. Colored layers in five lakes at various stages of separation from the sea were investigated using optical microscopy, spectrophotometry, spectrofluorimetry, and photobiology. The upper greenish colored layer located in the aerobic strata of all lakes near the compensation depth of 1% light penetration contains green algae. In the chemocline, another layer, brightly green, red or pink, is dominated by mixotrophic flagellates. Despite the very low light intensities and the presence of H2S, active photosynthesis by these algae appears to be occurring, as indicated by high values of the maximum quantum yield of primary photochemistry, electron transport activity, photosynthetic activity of photosystem II, the fraction of active centers, and low values of heat dissipation. In the reduced zone of the chemocline, a dense green or brown suspension of anoxygenic phototrophs (green sulfur bacteria) is located. |
| Databáze: | OpenAIRE |
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