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

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 (VM). VS for DIP of 1.57 0.29 mol cm2 d1 and DIN of 15.6 4.3 mol cm2 d , as well as VM 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 VM showed a weekly rhythmic uptake pattern, highlighted by a high correlation between DIP and DIN uptake (R = 0.943). VS 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.