Abstract
Summary A bathymetric survey shows Loch Borralie to have a maximum depth of 36 m. It is one of the most transparent lakes in Britain and is unstratified and poor in nutrients and phytoplankton, although the interstitial water of its calcareous muds is rich in nitrogen and phosphorus. Forty-four percent of the loch surface is densely colonised by macrophytes. The littoral to 2 m bears very sparse Chara aspera var. lacustris and the zone from 2 to 4.5 m is dominated by tall Hippuris vulgaris, Myriophyllum spicatum and four Potamogeton spp., for which Chara and Nitella (principally C. globularis and N. flexilis) form an understorey. Three Potamogeton species persist to 6.5 m in an undulating Chara- Nitella ‘meadow’ which continues, alone, to between 12 and 15 m depth. Loch Borralie is the most deeply and possibly the most extensively colonised lake in the United Kingdom.
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