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Algae are one of the main sources of organic carbon in aquatic ecosystems (Wetzel, 1995; Matveev and Robson, 2014). Currently, the frequency and extent of algal blooms in freshwater and marine water bodies are increasing throughout the world (Auer et al., 2010; Gubelit and Vanshtein, 2011; Schneider et al., 2014; Huisman et al., 2018). In many cases, the rapid increase in the number and biomass of algae is associated with the elevated concentrations of nutrients (nitrogen and/ or phosphorus) in the environment, one of the possible causes of which is the anthropogenic impact (Smith et al., 2006; Depew et al., 2011; Jenny et al., 2016). In addition to the possible suppressing effect of blooms on the coastal benthic communities, the destruction of coastal accumulations of algae can lead to the formation of hypoxia zones inside them, into which a large amount of labile organic carbon enters (Hecky and Hesslein, 1995; Ask et al., 2009; Hale et al., 2016). A rise in the concentrations of organic matter in anoxic zones intensifies the activity of anaerobic processes, including the biogenic formation of methane with its subsequent emission into the atmosphere (Schwarz et al., 2008; West et al., 2012; Liang et al., 2015). In this regard, the composition and functioning of a microbial community involved in algal detritus turnover is a relevant issue of modern research (Morrison et al., 2017; Mikhailov et al., 2019). Moreover, benthic algae are regarded as a promising tool for the wastewater treatment, and microbial communities decomposing their biomass – as biogas producers (Montingelli et al., 2015; Milledge et al., 2019). To date, much attention is paid to negative environmental changes in the coastal zone of Lake Baikal, one of which is the massive development of green filamentous algae of the genus Spirogyra (Kravtsova et al., 2014; Timoshkin et al., 2016; 2018; Potemkina et al., 2018). From 2007 to 2012, there were the first outbreaks of the massive development of Spirogyra spp. recorded in Listvennichny Bay (Kravtsova et al., 2012; 2014) and Bolshiye Koty Bay (Timoshkin et al., 2015). The results of recent studies have indicated the presence of these algae in the littoral zones of all basins of the lake (Volkova et al., 2018; Kravtsova et al., 2020). In the autumn, the wet biomass of Spirogyra spp. can exceed 300 g m-2 in the coastal zone of some areas, and its coastal accumulations can reach 90 kg m-2 (Timoshkin et al., 2015; 2016). It is very likely that not only aerobic but also anaerobic microorganisms are involved in the decomposition of such large accumulations of detritus. The example of Lake

The role of coastal accumulations of the Spirogyra spp. filamentous algae as a methane source in the littoral zone of Lake Baikal