Copepod selective behaviour tested on mixed algal suspensions.

<p>Selective ability of <i>Acartia grani</i> when offered 1:1 mixtures of distinct <i>Heterocapsa</i> sp. cell types (replete vs. depleted ones) A) Average clearance rates (mL cop^-1 day^-1) under N-limitation (f/2 vs. N/40 cells) at low and high food concentrations (516±5 cells mL^-1 and 2091±68 cells mL^-1, respectively); B) Average clearance rates (mL cop^-1 day^-1) under P-limitation (f/2 vs. P/40 cells) at low and high food concentrations (447±14 cells mL^-1 and 1758±11 cells mL^-1, respectively); C) Chesson's selectivity index values for the f/2 <i>Heterocapsa</i> sp. cells under both N-limitation and P-limitation selectivity experiments. The dashed horizontal line represents a level of α where no selectivity is detected. Notice that as only two prey choices (f/2 vs. either N/40 or P/40 cells) were offered, only the selectivity index for f/2 cells is shown. Error bars indicate the standard error.