European Diatom Database
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Dataset information

Welsh TP dataset

EDDI dataset codeCCW
Dataset typeTP
Number of samples11
Collection date1993 - 1994
ContributorHelen Bennion
ContactHelen Bennion

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).

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  • Summary of environmental data for this dataset:
    VariableUnitsNMinMaxMean
    Alkalinity畫q/l11402150676
    Calcium畫q/l1188.82202735
    Chloraphyll-a痢/l111.0724.59.87
    Chloride畫q/l111051824583
    Conductivity猶/cm1127.5442151
    Magnesium畫q/l1133.5634258
    Maximum depth of lakem111.8368.15
    Nitrate痢/l1120700125
    pHpH units116.358.617.17
    Potassium畫q/l11413435.3
    Silicamg/l110.847.792.65
    Sodium畫q/l111091846554
    Soluable reactive phosphorus痢/l111.751016109
    Sulphate畫q/l1164449181
    Total phosphorus痢/l115.281085145
    Water depth of diatom samplem111.8368.15