European Diatom Database-Welsh TP Dataset

The European Diatom Database (EDDI) is a web-based information system designed
to enhance the application of diatom analysis to problems of surface water
acidification, eutrophication and climate change.

This dataset includes 11 lakes distributed throughout Wales including small,
shallow and large, deep waterbodies. All lakes are circumneutral to alkaline
and cover a long total phosphorus gradient. Surface sediment samples were
collected by University College London during 1993-1994 and diatoms were
counted by Helen Bennion and Tim Allott. The dataset is part of a project which
aimed to develop an integrated biological classification scheme for 30 Welsh
lakes (Allott & Monteith, 1999). These sites form part of a larger diatom-total
phosphorus training set of 152 NW European lakes (Bennion et al., 1996a).
Palaeolimnological studies have been undertaken at a number of these sites
(e.g. Bennion, 1995, 1996; Bennion & Appleby, 1999; Bennion et al., 1996b,
1997a. 1997b, 1998).