Figure 5: Comparison of maximum nutrient uptake rates (V_max) of the different species.

Maximum uptake rates of (a) NH₄⁺, (b) NO₃⁻ and (c) PO₄³⁻. Shading of the bars indicates whether specimens were collected from 5 m depth (light grey bars) or 20 m depth (dark grey bars); note that not all species were present at both depths. Error bars represent s.d. of the mean (n = 9). Within each panel, bars that do not share the same letter are significantly different, as tested by two-way analysis of variance (Table 1) followed by post hoc comparison of the means.