Abstract
Mosses form an important component of the flora in terrestrial and lacustrine ecosystems of Antarctica. Here we report the occurrence of mosses in Radok Lake, Amery Oasis, East Antarctica, which has a maximum water depth of c. 360 m and is presumed to be the deepest freshwater lake in Antarctica. Aquatic mosses, determined as Bryum pseudotriquetrum, were found at water depths of up to 81 m, growing on the sediment surface at different locations in the lake basin. This is the deepest record of living mosses in Antarctic lakes. The modern oligo- to ultra-oligotrophic hydrological characteristics of Radok Lake may be an indispensable precondition for the growth of the moss at these water depths.
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