Fig. 2

Nutrient dynamics in C. xamachana. Displayed are mean values (n = 5) per group for a C enrichment from NaH¹³CO₃ expressed as AP¹³C and b N enrichment from Na¹⁵NO₃ expressed as AP¹⁵N after the pulse (5 h), chase3h (3 h after pulse), and chase6h (6 h after pulse). Both panels are depicted with broken y-axes to facilitate comparisons between less enriched samples. Treatments included light-incubated symbiotic medusae (SymL), dark-incubated symbiotic medusae (SymD), and light-incubated aposymbiotic medusae (ApoL). Error bars represent 95 % confidence intervals and dashed line natural isotope ratios (n = 5; 1.081 AP¹³C and 0.368 AP¹⁵N). Further shown are c the regression between host C enrichment and symbiont density expressed as AP¹³C for SymL (n = 15; y = 1.24 + 0.17x; r²_Adj = 0.68, p < 0.001) and d the regressions between host ¹⁵N enrichment and medusae size expressed as AP¹⁵N from all treatments for chase3h (y = 0.3381 + 0.0014x; r²_Adj = 0.67, p < 0.001) and chase6h (y = 0.3583 + 0.0004x; r²_Adj = 0.86, p < 0.001; each n = 15)