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Dataset information

French Massif Central TP dataset

EDDI dataset codeFrench
Dataset typeTP
Number of samples28
Collection date1996 - 1998
ContributorPatrick Rioual
ContactPatrick Rioual

This dataset includes 28 surface sediment samples from lakes in the Massif Central region of France. The lakes are diverse in their origin, volcanic or glacial, and their morphometry, size and depth, from deep crater lakes to shallow glacial lakes. They are situated along an altitudinal gradient from 630-1250 m a.s.l. The lakes have circumneutral to alkaline pH and cover a long total phosphorus gradient from ultra-oligotrophic to hypertrophic conditions. Surface sediment samples were collected between 1996 and 1998 and diatoms were counted by Patrick Rioual. A diatom-alkalinity transfer function was developed from these data and details are given in Rioual (2000). Palaeolimnological studies of long sediment cores, spanning at least the last glacial/interglacial cycle, have been undertaken at a number of these sites (Pailles, 1989; Reille et al., 2000; Rioual et al., 2001).

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  • Summary of environmental data for this dataset:
    VariableUnitsNMinMaxMean
    Alkalinity畫q/l2844.51728459
    Aluminium (total)痢/l28209054.6
    Calcium畫q/l2812.5740225
    Chloraphyll-a痢/l190.4319.65.38
    Chloride畫q/l2828.5727106
    Conductivity猶/cm2816.521159.4
    Iron痢/l24102920227
    Magnesium畫q/l2821.4722177
    Manganese痢/l14106017.1
    Maximum depth of lakem28110929.1
    Nitrate痢/l2721610119
    pHpH units284.918.256.47
    Potassium畫q/l282.057828
    Secchi depthm210.411.83.73
    Silicamg/l190.921.26.79
    Sodium畫q/l286.52645118
    Soluable reactive phosphorus痢/l192.33578.64
    Sulphate畫q/l284.3718451.3
    Total phosphorus痢/l283.621836.9
    Water depth of diatom samplem28110929
    Zinc痢/l271012068.1