Correlation between maximum intracellular NO3− concentration and survival time under dark/anoxic conditions in the diatom species D. brightwellii (D), S. costatum (S), T. weissflogii (T), C. closterium (C), N. punctata (N), and A. coffeaeformis (A). Circles denote pelagic species, diamonds denote benthic species. Values are mean concentration ± SD of three replicates; Spearman's R and probability P for nonlinear correlations are given.