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Marine Ecology Progress Series

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MEPS 446:161-171 (2012)  -  DOI:

Oceanic nutrient supply and uptake by microphytobenthos of the Hichirippu Lagoon, Hokkaido, Japan

Tomohiro Komorita1,2,*, Hiroaki Tsutsumi2, Rumiko Kajihara1,3, Natsumi Suga1,4, Seiichiro Shibanuma1, Toshiro Yamada5, Shigeru Montani1

1Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo 060-0810, Japan
2Faculty of Environmental and Symbiotic Science, Prefectural University of Kumamoto Tsukide, Kumamoto 862-8502, Japan
3National Research Institute of Fisheries Engineering、7620-7, Hasaki, Kamisu-shi, Ibaraki 314-0408, Japan
4Center for Marine Environmental Studies, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
5Nishimuragumi Co. Ltd., 133 Sakaemachi, Yubetsu, Monbetsu, Hokkaido 099-6404, Japan

ABSTRACT: We conducted field surveys to determine spatio-temporal variations in the water quality (including inorganic nutrient concentration) of a coastal lagoon, Hichirippu Lagoon (3.56 km2), in Hokkaido, Japan. During a typical supply period (winter), a 24 h continuous survey was conducted to evaluate nutrient supply from the open ocean and examine nutrient utilization by microphytobenthos (MPB) based on the mass balance of a biophilic element. During February 2008, the majority of NO3+NO2-N was supplied from the open ocean, and the dissolved inorganic nitrogen (DIN) budget was 3.25 kmol N d1. In March 2008, the total amount of organic nitrogen was 39.0 to 588 kmol N for MPB in the surface sediment (depth, 0.5 cm). Assuming that MPB in the surface sediment used all NO3+NO2-N input (3.93 kmol N d1), their temporal division rate (NO3+NO2-N uptake/total amount of MPB) would be 0.01 to 0.10 d1. Here the annual DIN budget was estimated to be 258 kmol N yr1, which mainly depended on MPB-fixed oceanic DIN during winter.

KEY WORDS: Microphytobenthos · Coastal ecosystem · Nutrient cycles · Dissolved inorganic nutrients · Mass balance

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Cite this article as: Komorita T, Tsutsumi H, Kajihara R, Suga N, Shibanuma S, Yamada T, Montani S (2012) Oceanic nutrient supply and uptake by microphytobenthos of the Hichirippu Lagoon, Hokkaido, Japan. Mar Ecol Prog Ser 446:161-171.

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