A second contribution of the series focuses on the ecology of accumulated material on the splash zone of Lake Baikal. Accumulated detritus material, natural for Lake Baikal ecosystem, is mostly analyzed. Preliminary results of interdisciplinary studies on various processes and interactions of the natural accumulated material (macrophytes or their remains, algal maths, periphyton and detritus of different origin) and that of anthropogenic origin (domestic waste), its composition, quantitative characteristics, seasonal dynamics during 2007–2011 in the shallow zone of Southern Baikal (Bolshye Koty Bay) are presented. The first attempt at classifying the accumulated material available on Baikal shores was made by the authors, they also determined the relationships between abundant growth of terrestrial and aquatic plants, life cycles of hydrobionts and specific processes of detritus accumulation in the splash zone. Peak of Ulothrix zonata algae activity as a constituent part of the shore detrital matter related to annual rise of the Lake level was registered every year in June. These findings serve a basis for advanced integrated monitoring of its ecosystem and suggest that further interdisciplinary research of Baikal splash zone is needed.