NDLI: Biogeochemical processes in the algal-bacterial mats of the Urinskii alkaline hot spring

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Biogeochemical processes in the algal-bacterial mats of the Urinskii alkaline hot spring

Content Provider	Springer Nature Link
Author	Bryanskaya, A. V. Namsaraev, Z. B. Kalashnikova, O. M. Barkhutova, D. D. Namsaraev, B. B. Gorlenko, V. M.
Copyright Year	2006
Abstract	The structure and production characteristics of microbial communities from the Urinskii alkaline hot spring (Buryat Republic, Russia) have been investigated. A distinctive characteristic of this hot spring is the lack of sulfide in the issuing water. The water temperature near the spring vents ranged from 69 to 38.5°C and pH values ranged from 8.8 to 9.2. The total mineralization of water was less than 0.1 g/liter. Temperature has a profound effect on the species composition and biogeochemical processes occurring in the algal-bacterial mats of the Urinskii hot spring. The maximum diversity of the phototrophic community was observed at the temperatures 40 and 46°C. A total of 12 species of cyanobacteria, 4 species of diatoms, and one species of thermophilic anoxygenic phototrophic bacteria, Chloroflexus aurantiacus, have been isolated from mat samples. At temperatures above 40°C, the filamentous cyanobacterium Phormidium laminosum was predominant; its cell number and biomass concentration comprised 95.1 and 63.9%, respectively. At lower temperatures, the biomass concentrations of the cyanobacterium Oscillatoria limosa and diatoms increased (50.2 and 36.4%, respectively). The cyanobacterium Mastigocladus laminosus, which is normally found in neutral or slightly acidic hydrothermal systems, was detected in microbial communities. As the diatom concentration increases, so does the dry matter concentration in mats, while the content of organic matter decreases. The concentrations of proteins and carbohydrates reached their maximum levels at 45–50°C. The maximum average rate of oxygenic photosynthesis [2.1 g C/(m$^{2}$ day)], chlorophyll a content (343.4 mg/m$^{2}$), and cell number of phototrophic microorganisms were observed at temperatures from 45 to 50°C. The peak mass of bacterial mats (56.75 g/m$^{2}$) occurred at a temperature of 65–60°C. The maximum biomass concentration of phototrophs (414.63 × 10$^{−6}$ g/ml) and the peak rate of anoxygenic photosynthesis [0.42 g C/(m$^{2}$ day)] were observed at a temperature of 35–40°C.
Starting Page	611
Ending Page	620
Page Count	10
File Format	PDF
ISSN	00262617
Journal	Microbiology
Volume Number	75
Issue Number	5
e-ISSN	16083237
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	alkaline hydrotherms microbial mats cyanobacteria phototrophic bacteria diatoms productivity chemical composition Medical Microbiology Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology Applied Microbiology and Biotechnology

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