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Submerged aquatic vegetation takes up water-column dissolved inorganiccarbon (DIC) as a carbon source across its thin cuticle layer. It isexpected that marine macrophytes also use atmospheric CO2 when exposedto air during low tide, although assimilation of atmospheric CO2 hasnever been quantitatively evaluated. Using the radiocarbon isotopicsignatures (Δ14C) of the seagrass Zostera marina, DIC and particulate organic carbon (POC), we showquantitatively that Z. marina takes up and assimilates atmospheric modern CO2 ina shallow coastal ecosystem. The Δ14C values of the seagrass(−40 to −10 ‰) weresignificantly higher than those of aquatic DIC (−46to −18 ‰), indicating that the seagrass uses a14C-rich carbon source (atmospheric CO2,+17 ‰). A carbon-source mixing model indicated thatthe seagrass assimilated 0–40 % (mean, 17 %) of its inorganic carbon asatmospheric CO2. CO2 exchange between the air and the seagrassmight be enhanced by the presence of a very thin film of water over theair-exposed leaves during low tide. Our radiocarbon isotope analysis,showing assimilation of atmospheric modern CO2 as an inorganic carbonsource, improves our understanding of the role of seagrass meadows incoastal carbon dynamics

biogeosciences

Radiocarbon isotopic evidence for assimilation of atmospheric CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; by the seagrass &amp;lt;i&amp;gt;Zostera marina&amp;lt;/i&amp;gt;