Red-colored water in the supralittoral zone of the Alaid Volcano: long-term spectroscopic observations

Zhiltsova, A.; Anikin, L.; Rashidov, V.; Patsaeva, S.

Авторы: Zhiltsova Anna, Anikin Leonid, Rashidov Vladimir, Patsaeva Svetlana
Журнал: Proceedings of SPIE - The International Society for Optical Engineering
Том: 11845
Год издания: 2021
Издательство: SPIE, the International Society for Optical Engineering
Местоположение издательства: Bellingham, WA, United States
Номер статьи: 11845F
DOI: 10.1117/12.2590755
Аннотация: The paper presents the results of a spectroscopic study of the "colored" water detected in the splash baths in the supralittoral zone of the Alaid Volcano (the Kuril Islands) from 2015 to 2019. The splash baths with magenta, red and red-yellow water located in different parts of the island in various summer seasons. The analysis of fluorescenсе and absorption data of the water samples revealed the presence of a large amount of bacteriochlorophyll a in the water, which is the main photosynthetic pigment of purple sulfur bacteria. The assumption of the presence of cells of microorganisms was confirmed by observations under a microscope. To determine the morphotype of microorganisms the acetonemethanol extracts from the samples were prepared and studied using spectral methods. The characteristic absorption lines of carotenoids and the monomeric form of bacteriochlorophyll identified cells as Thiocystis and Thiorhodococcus morphotypes of purple sulfur bacteria. The regular observation of water samples with microorganisms in the supralittoral zone of the Alaid Volcano leads to the conclusion that the development of the purple phototrophic bacteria is not an accidental event, but a typical phenomenon in this area. The fact that each summer season colored water were found in different places indicates a cyclical changes in living conditions of microorganisms from favorable to unfavorable habitats.
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Red-colored water in the supralittoral zone of the Alaid Volcano: long-term spectroscopic observationsстатья

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