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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

    Publications for this dataset:

    Allott, T.E.H. & Monteith, D.T. (1999). Classification of lakes in Wales for conservation using integrated biological data.. CCW Contract Science Report No. 314.

    Bennion, H. (1995). Quantitative reconstructions of the nutrient histories of three Anglesey lakes. CCW Contract Science Report No. 87.

    Bennion, H., Duigan, C. A., Haworth, E. Y., Allott, T. E. H., Anderson, N. J., Juggins, S. & Monteith, D. T. (1996b) The Anglesey Lakes, Wales, UK- Changes in trophic status of three standing waters as inferred from diatom transfer functions and their implications for conservation. Aquatic Conservation: Marine and Freshwater Ecosystems, 6, 81-92.

    Bennion, H., Juggins, S. & Anderson, N. J. (1996a) Predicting epilimnetic phosphorus concentrations using an improved diatom-based transfer function and its application to lake eutrophication management. Environmental Science and Technology, 30, 2004-2007.

    Bennion, H. (ed). (1996) A study of recent environmental change within selected standing waters proposed as Special Areas of Conservation. A report to the Countryside Council for Wales by ENSIS Ltd. Environmental Change Research Centre, Research Report No. 22, University College London.

    Bennion, H., Shilland, E. & Appleby, P.G. (1997b) A study of recent environmental change at Llyn Tegid (Lake Bala), Wales. A Report to the Environment Agency. Environmental Change Research Centre, Research Report No. 36, University College London.

    Bennion, H., Allott, T.E.H., Appleby, P.G., Hunt, M., Oliver, E. & Patrick, S.T. (1997a) A study of recent environmental change within selected standing waters proposed as Special Areas of Conservation (SAC) in Wales - Llyn Idwal, Llyn Cwellyn and Llyn Safadden (Llangorse Lake) Phase II. CCW Research Report No. 187.

    Bennion, H., Allott, T.E.H. & Shilland, E. (1998). Investigation of environmental change in two mesotrophic lakes in Mid-Wales: Llyn Eiddwen and Llyn Fanod. Final report to CCW by ENSIS Ltd. Environmental Change Research Centre, Research Report No. 46, University College London.

    Bennion, H. & Appleby, P.G. (1999) An assessment of recent environmental change in Llangorse Lake using palaeolimnology. Aquatic Conservation: Marine and Freshwater Ecosystems, 9, 361-375.