Results Long-term trends and periodicities Total phytoplankton biomass (TB hereafter) experienced a decreasing trend in Las Madres lake for the whole period under study (Fig. 1a ).
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The analysis of time series using AEM revealed a negative trend for TB from 1992–2016 (Table 2 ), as already mentioned, and two further periodicities: a decadal (17 years) and an annual one (Table 2 ).
Throughout the whole series (1992–2016), all biomasses of taxonomical groups (TGBs hereafter), except that of Diatoms, showed a trend and periodicity in their dynamics (Table 2 ).