Subtropical Diatoms data set (Bolivian Altiplano - Northern Pampean Plain)
Description
This dataset contains diatom assemblage and hydrochemical data from 95 saline lakes and salt flats distributed across the Bolivian Altiplano and the northern part of the Argentinean Pampa. Data were compiled from multiple field surveys conducted between 1978 and 2007, all following the same sampling and analytical methodology, allowing the surveys to be combined into a single, internally consistent training set.
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This dataset was compiled from multiple field surveys conducted between 1978 and 2007. Detailed information regarding site selection, sampling methodology, and laboratory procedures can be found in Sylvestre et al. (2001) and Servant-Vildary et al. (2002). Diatom identification was performed to the species level using light microscopy, following the taxonomic frameworks established by Frenguelli (1929, 1936), Hendey (1964), Germain (1981), Krammer and Lange-Bertalot (1986, 1988, 1989, 1991), Patrick and Freese (1961) and Williams & Round (1988), with a minimum of 500 valves counted per sample to ensure robust assemblage relative abundance representation (Sylvestre et al., 2001; Servant-Vildary et al., 2002). This taxonomic framework, rather than more recent nomenclatural revisions, was deliberately retained for consistency with previous studies conducted on the same material and geographic region (Sylvestre et al., 2001; Servant-Vildary et al., 2002). Hydrochemical variables were determined as described in Sylvestre et al. (2001). Water samples were collected in plastic bottles, preserved with chloroform, and filtered through a 0.4 µm mesh. Calcium and magnesium were analyzed by inductively coupled plasma atomic emission spectrometry, sodium and potassium by atomic absorption spectrometry, and chloride and sulfate by ion chromatography (Dionex). Alkalinity was determined by potentiometric titration, and salinity was calculated as the sum of the major cations and anions (Ca²⁺, Mg²⁺, Na⁺, K⁺, SO₄²⁻, Cl⁻, and alkalinity).