Fig 3.
(A) NH4+ uptake rates (μmol g-1 FW hour-1) in 20 μM NH4+ seawater for 30 minutes and (B) internal NH4+ pools (μmol g-1 FW) for Ulva australis grown under ambient and enriched NH4+ treatments across a range of pHTs. Grey points represent ambient NH4+ treatments and black points represent enriched NH4+ treatments. A plus symbol (+) indicates an outlier which was removed for statistical analysis. The slopes of NH4+ uptake rates and internal NH4+ pools with pHT for each NH4+ treatment (dashed lines) were tested for an interaction using an ANCOVA.