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. Shallow coastal waters in many regions are subject to nutrient enrichment.Microphytobenthos (MPB) can account for much of the carbon (C) fixation inthese environments, depending on the depth of the water column, but theeffect of enhanced nutrient availability on the processing and fate ofMPB-derived C (MPB-C) is relatively unknown. In this study, MPB was labeled(stable isotope enrichment) in situ using 13 C-sodium bicarbonate. Theprocessing and fate of the newly fixed MPB-C was then traced using ex situincubations over 3.5 days under different concentrations of nutrients(NH 4 + and PO 4 3 - : ambient, 2 × ambient, 5 × ambient, and 10 × ambient). After 3.5 days, sediments incubated withincreased nutrient concentrations (amended treatments) had increased loss of 13 C from sediment organic matter (OM) as aportion of initial uptake (95 % remaining in ambient vs. 79–93 % foramended treatments) and less 13 C in MPB (52 % ambient, 26–49 %amended), most likely reflecting increased turnover of MPB-derived Csupporting increased production of extracellular enzymes and storageproducts. Loss of MPB-derived C to the water column via dissolved organic C(DOC) was minimal regardless of treatment (0.4–0.6 %). Loss due torespiration was more substantial, with effluxes of dissolved inorganic C(DIC) increasing with additional nutrient availability (4 % ambient,6.6–19.8 % amended). These shifts resulted in a decreased turnover timefor algal C (419 days ambient, 134–199 days amended). This suggests thatnutrient enrichment of estuaries may ultimately lead to decreased retentionof carbon within MPB-dominated sediments.

biogeosciences

Short-term fate of intertidal microphytobenthos carbon under enhanced nutrient availability: a &amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C pulse-chase experiment