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Succession experimentsAlthough succession dynamics differed in terms of phytoplankton assemblage composition during the experiments (Figs 2–6), L + N and L + N + OC growth conditions generally enabled higher diversity than N + OC conditions during the experiments for all lake assemblages studied (Fig. 7). During all experiments, L + N and L + N + OC conditions resulted in increases in cell abundance towards the end of the experiment, whereas N + OC condition caused an increase in cell abundance in the first week, followed by a decrease towards the end of the experiment (Figs 2–6). Densities of all taxa were generally lower under N + OC growth conditions than under L +N and L + N + OC conditions (Figs 2–6). However, in experiments conducted with assemblages from the nutrient limited Casa de Pedra Lake, Chlamydomonas sp. 1 reached higher peak abundance under N + OC conditions than under L + N and L + N + OC conditions (Fig. 2). In experiments with assemblages from the Casa de Pedra and CTAN lakes, two Cryptomonas species reached the highest densities of all species towards the end of the experiment under both L + N and L + N þ+ OC conditions (Figs 2 and 3). In experiments with assemblages from the CTAN Lake, Cryptomonas erosa dominated the L þ N and L þ N þ OC treatments towards the end of the experiments, while Chlamydomonas sp. 1 dominated the assemblage during the first week under N þ OC conditions, still maintaining higher densities than the other species at the end of the experiment (Fig. 3). In experiments with assemblages from the Azul Lake, Chlamydomonas dominated under L þ N and L þ N þ OC conditions. Experimental N þ OC conditions resulted in the dominance of the dinoflagellate Peridinium umbonatum, with especiallyhigh abundance during the first 2 weeks of the experiment (Fig. 4). In the experiment with assemblages from the Boa Vista Lake, Chlamydomonas sp. 1, Scenedesmus acuminatus and Cryptomonas erosa increased towards the endof the experiment under both L þ N and L þ N þ OC conditions (Fig. 5). Carteria cf. intermedia initially dominated in experiments with assemblages from the Ferros Lake under L þ N and L þ N þ OC conditions, but a decrease was observed towards the end of the experiment (Fig. 6).
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