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Nutrient flux in short-term enclosures of intertidal sand communities
Asmus, R. (1986). Nutrient flux in short-term enclosures of intertidal sand communities, in: Muus, K. (Ed.) Proceedings of the 20th European Marine Biology Symposium: Nutrient Cycling. Processes in Marine Sediments, Hirtshals, Denmark, 9-13 September 1985. Ophelia: International Journal of Marine Biology, 26: pp. 1-18
In: Muus, K. (Ed.) (1986). Proceedings of the 20th European Marine Biology Symposium: Nutrient Cycling. Processes in Marine Sediments, Hirtshals, Denmark, 9-13 September 1985. Ophelia: International Journal of Marine Biology, 26. Ophelia Publications: Helsingør. ISBN 87-981066-4-3. 477 pp., more
In: Ophelia: International Journal of Marine Biology. Ophelia Publications: Helsingør. ISSN 0078-5326, more
Peer reviewed article  

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    VLIZ: Proceedings [16817]
Document type: Conference paper

Keyword
    Marine

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Abstract
    The investigation was carried out in a shallow water area in the northern Wadden Sea where the euphotic zone reaches down to the bottom. The nutrient flux was measured monthly during 1980 in three communities (an Arenicola-flat, a seagrass-bed and a Nereis-Corophium-belt) in connection with measurements of community metabolism. The nutrient fluxes of NH4+, NO3-, NO2-, Si(OH)4 were determined in light and dark bell jars in relation to temperature, O2 consumption and concentrations of nutrients in the ambient water. Experimentally increased abundance of macrofauna (Arenicola marina) enhanced the regeneration of NH 4+, NO3-, NO2-. The plants took up NH4+ more intensely in the light than in the dark. A community dominated by Zostera noltii showed the highest rate of NH4+ uptake (-355µmol NH4+.m-2.h-1). NO3- was mainly taken up by the communities (up to -354µmol NO3- .m-2.h-1). Si(OH)4 was released as well as taken up by all the three communities. Highest rates of Si(OH)4 release were measured in the Arenicola-flat (up to +1493µmol Si(OH)4 m-2.h-1). This flux was correlated with the O2 consumption, mainly by macrofauna. The system of the three sand flat communities imports nitrate and nitrite and exports ammonia and silicate on an annual basis.

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