Note
Productivity-nutrient enrichment assays and tissue analysis of three dominant macroalgae at Carrie Bow Cay, Belize, suggest that the degree and type of nutrient limitation in tropical marine macroalgae are highly ecosystem and species dependent. In the frondose algae, Dictyota divaricata L'amouroux and Acanthophora spicifera Lamouroux, collected from a pristine barrier reef site, productivity increased significantly with enrichment by dissolved inorganic nitrogen (N, as NH4+) and phosphorus (Pi, which accounted for more of the enhanced productivity), compared to insignificant or reduced effects of enrichment of these algae collected at a detritus-rich mangrove island.