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Marine Ecology Progress Series

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MEPS 379:33-44 (2009)  -  DOI:

Dissolved inorganic nitrogen uptake by intertidal microphytobenthos: nutrient concentrations, light availability and migration

Sorcha Ní Longphuirt1, Jae-Hyun Lim1, Aude Leynaert2, Pascal Claquin3, Eun-Jung Choy4, Chang-Keun Kang4, Soonmo An1,*

1Coastal Environmental System School, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea
2LEMAR, Laboratoire des Sciences de l’Environnement Marin, UMR 6539 CNRS, Institut Universitaire Européen de la Mer, Technopôle Brest-Iroise, 29280 Plouzané, France
3Laboratoire de Biologie et Biotechnologies Marines, UMR100 M IFREMER/UCBN PE2M, Université de Caen Basse-Normandie, 14032 Caen cedex, France
4Department of Biology, Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea
*Corresponding author. Email:

ABSTRACT: The importance of intertidal flats as areas of nitrogen filtering has become increasingly apparent in recent times. To understand fully the cycling of this nutrient in these areas of high metabolic activity, it is necessary to elucidate the influence of microphytobenthos (MPB) on stocks of ammonium and nitrate in surface areas. In this study, we aimed to quantify nitrogen uptake and relate it to the in situ concentrations and environmental conditions to which MPB are exposed. In an estuarine system on the Korean Peninsula, we conducted kinetic experiments using 15N stable isotopes and core sampling over the tidal cycle to determine the temporal evolution of porewater nutrient concentrations and the migration of MPB. The results revealed a range of Ks values between 1.5 and 11.8 µmol l–1 for ammonium and 19.2 µmol l–1 for nitrate. Thus MPB communities vary their affinity for dissolved inorganic nitrogen (DIN), which may be related to the substrate conditions to which they are exposed. Uptake of ammonium under experimentally darkened or natural night conditions was, on average, 50% lower than during light periods. The range of porewater DIN concentrations was large and appeared to be primarily determined by tidal influences. This oscillation, coupled to the vertical migration of the MPB in sediments, is likely to have a substantial effect on uptake over the short term (hours). The results indicate that, contrary to our conceptual model, the MPB largely incorporates DIN at the sediment surface during low tide periods when ammonium concentrations are at their highest. As a result, our representation of the MPB in coastal and estuarine models needs to be reassessed.

KEY WORDS: Nitrogen · Kinetic · Microphytobenthos · Porewater · 15N stable isotope

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Cite this article as: Ní Longphuirt S, Lim JH, Leynaert A, Claquin P, Choy EJ, Kang CK, An S (2009) Dissolved inorganic nitrogen uptake by intertidal microphytobenthos: nutrient concentrations, light availability and migration. Mar Ecol Prog Ser 379:33-44.

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