Supplementary data for manuscript: Shifting baselines: How coastal settings shape nitrogen removal benefits in mangrove ecosystems

In contrast, DNRA dominated nitrate reduction in the open-coast setting, fueled by high dissolved organic carbon (DOC) to extractable nitrate ratios. <a href="" target="_blank">Mangrove effects on N cycling also differed between settings: mangrove presence suppressed DNRA in the estuarine setting, but enhanced N-removal potential in the open-coast setting by elevating DOC and reducing oxygen penetration depth. </a>Extending these findings with a global synthesis, we show that mangrove forests could reduce functional differences in sediment N cycling between contrasting sedimentary settings.

Together, our results suggest that coastal geomorphic setting is an important driver of N-transformation pathways and N-removal benefits, highlighting the need to account for shoreline heterogeneity in coastal biogeochemical assessments.</p>