Abstract
Based on materials collected in 2003–2007, data on aquatic lichens of the genus Verrucaria from the rocky littoral zone of Lake Baikal are discussed. The maximum density of their occurrence was observed at a depth of 1.5 m; 95–100% of rock fragments recovered from depths of 1.5–2.2 m are encrusted by 24–43% with the thalli of Verrucaria spp. It was found that the lichens contribute actively to the physical and physicochemical weathering of their rock substrate and prefer to reside on the rocks of granitic composition. The chemical composition of aquatic verrucaria is dominated by the same elements that are most abundant in the rocks (Ca > K > Fe > Al > Mg > P > S > Na > Mn > Sr > Ba), and, in most cases, the characteristic element ratios of the rock compositions are preserved in the composition of the thalli of Verrucaria spp. Compared with the elemental composition of the near-bottom water layer, the lichens most extensively concentrate the elements that slowly migrate in water: Gd > Sm > Pr > Nd > Al > La > Dy > Tb > Y > Lu > Ce > Yb > Be > Tm > Co > Nb > Mn > Zn. Compared with the composition of rocks, the mineral composition of the thalli of Verrucaria spp. is enriched by a factor of 100–10 in Hg > As > P > Zn > Li > S > U > Mo > Se > Cd > Ca > Tl > Sr > Pb > Be.
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Original Russian Text © N.N. Kulikova, A.N. Suturin, E.V. Saibatalova, S.M. Boiko, E.N. Vodneva, O.A. Timoshkin, A.V. Lishtva, 2011, published in Geokhimiya, 2011, Vol. 49, No. 1, pp. 71–80.
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Kulikova, N.N., Suturin, A.N., Saibatalova, E.V. et al. Geologic and biogeochemical role of crustose aquatic lichens in Lake Baikal. Geochem. Int. 49, 66–75 (2011). https://doi.org/10.1134/S0016702910111023
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DOI: https://doi.org/10.1134/S0016702910111023