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Seagrasses dominate shallow coastal environments where nitrogen (N) availability in the water column is often sporadic and mainly in the form of pulses. We investigated the N uptake competition between seagrasses and seaweeds through a series of  15 N surge uptake experiments combining single-species and mixed incubations across ammonium concentrations. N surge uptake rates of seagrasses were 2 to 14-fold higher than those of seaweeds in the majority of combinations, showing that seagrasses are generally in a competitive advantage over seaweeds in N-poor environments with N-pulses. No threshold concentration of ammonium was found beyond which seaweeds performed better than seagrasses. Mixed incubations revealed interspecific interactions that affected rates positively and negatively. Uptake rates obtained in single-species incubations, therefore, cannot always be used to predict the outcome of uptake competition. Only two ( Zostera marina vs .  Ulva rotundata  and  Zostera marina vs .  Codium decorticatum ) of the nine combinations tested ( Z .  marina ,  Z .  noltei  and  Cymodocea nodosa vs .  U .  rotundata ,  C .  decorticatum  and  Dictyota dichotoma ) were found to enhance macroalgal uptake. Our results showed that the surge uptake capacity of seagrasses represents an important mechanism in their N acquisition strategy that justifies their dominance in shallow oligotrophic environments.

Interactions between seagrasses and seaweeds during surge nitrogen acquisition determine interspecific competition