Data-set for the paper "Phosphate and Nitrate Uptake Dynamics in Palmaria palmata (Rhodophyceae): Ecological and Physiological Aspects of Nutrient Availability" Version 13

Uptake dynamics of dissolved inorganic phosphate (DIP) and dissolved inorganic nitrate (DIN) in young Palmaria palmata (n = 49), cultivated in a range of DIP concentrations (0.0 6.0 mol L¹) and nonlimiting DIN concentration (50 mol L¹) under fully controlled laboratory conditions, were quantified in a pulse-and-chase approach over 5 weeks. Two different uptake rates were specified: (1) surge uptake (VS) after starvation and (2) maintenance uptake with filled nutrient pools (V_M). V_S for DIP of 1.57 0.29 mol cm² d¹ and DIN of 15.6 4.3 mol cm² d , as well as V_M for DIP of 0.57 0.22 mol cm² d¹ and DIN of 5.6 2.1 mol cm² d¹ were calculated. In addition, an absolute size of the internal storage capacity (ISC) for DIP of 22 mol cm² and DIN of 222 mol cm2 was determined. A DIPtoDIN uptake ratio of 1:10 under V_M showed a weekly rhythmic uptake pattern, highlighted by a high correlation between DIP and DIN uptake (R = 0.943). V_S for DIN did not occur under DIP depletion, but uptake rates increased with increasing DIP availability. Hence, DIP availability limited access to DIN, which was also reflected by total dissolvable protein concentrations in sporophytes, which ranged from 10.2 2.5% to 24.6 8.0% dry weight depending on DIP availability. Similarly, total dissolvable carbohydrate concentration ranged from 22.1 3.6% to 54.3 12.3% dry weight. The data presented in this study open further insight into ecological and physiological aspects of nutrient availability in P. palmata and allow for an optimization in cultivation.