DEVOKE WATER AND LOCH SIONASCAIG - RECENT ENVIRONMENTAL-CHANGES AND THE POSTGLACIAL OVERVIEW

Diatoms from postglacial sediments of two oligotrophic lakes, one in northwest England and one in northwest Scotland, have been examined. Apart from the decline of alkalinity in the early post-glacial period at both sites, the only evidence for further increase in acidity occurs in the post-1900 sediments of Devoke Water (Cumbria). There has been no such change in Loch Sionascaig, in a region of lower acid deposition in northwest Scotland. Authors