, Volume 25, Issue 3, pp 279-295

Diatom-based ionic concentration and salinity models from the south Bolivian Altiplano (15–23 ° S

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Abstract

The relationship between surface sediment diatom assemblages and measured limnological variables in fifty eight lake samples from the south Bolivian Altiplano was examined by constructing a diatom-water chemistry dataset. Analysis of this dataset by canonical correspondence analysis revealed that salinity and ionic concentration accounted for a significant amount of the variation in the distribution of the diatom assemblages. Two methods ‘weighted-averaging regression and calibration’, and ‘by-class mean percentage table’ were used to established a transfer function for future reconstruction of past lake water salinity and ionic concentration in the southern Bolivian Altiplano. Weighted-averaging regression and calibration with inverse deshrinking provided a better model for the water chemistry reconstructions in this region.