Seasonal variation in nitrification and nitrate-reduction pathways in coastal sediments in the Gulf of Finland, Baltic Sea

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Jäntti , H , Stange , F , Leskinen , E & Hietanen , S 2011 , ' Seasonal variation in nitrification and nitrate-reduction pathways in coastal sediments in the Gulf of Finland, Baltic Sea ' , Aquatic Microbial Ecology , vol. 63 , no. 2 , pp. 171-181 . https://doi.org/10.3354/ame01492

Title: Seasonal variation in nitrification and nitrate-reduction pathways in coastal sediments in the Gulf of Finland, Baltic Sea
Author: Jäntti, Helena; Stange, Florian; Leskinen, Elina; Hietanen, Susanna
Contributor organization: Environmental Sciences
Aquatic Sciences
Tvärminne Zoological Station
Date: 2011-04-26
Language: eng
Number of pages: 11
Belongs to series: Aquatic Microbial Ecology
ISSN: 0948-3055
DOI: https://doi.org/10.3354/ame01492
URI: http://hdl.handle.net/10138/27950
Abstract: The Baltic Sea is one of the most eutrophic marine areas in the world. The role of nitrogen as a eutrophicating nutrient in the Baltic Sea has remained controversial, due to lack of understanding of nitrogen cycling in the area. We investigated the seasonal variation in sediment nitrification, denitrification, anaerobic ammonium oxidation (anammox), and dissimilatory nitrate reduction to ammonium (DNRA) at two coastal sites in the Gulf of Finland. In addition to the in situ rates, we assessed the potential for these processes in different seasons. The nitrification and nitrogen removal processes were maximal during the warm summer months, when the sediment organic content was highest. In colder seasons, the in situ rates of the nitrification and nitrate reduction processes decreased, but the potential for nitrification remained equal to or higher than that during the warm months. The denitrification and nitrification rates were usually higher in the accumulation basin, where the organic content of the sediment was higher, but the transportation area, despite lower denitrification rates and potential, typically had higher potential for nitrification than the accumulation basin. Anammox and DNRA were not significant nitrate sinks in any of the seasons sampled. The results also show that the denitrification rates in the coastal Gulf of Finland sediment have decreased, and that benthic denitrification might be a less important sink for fixed nitrogen than previously assumed.
Subject: 1171 Geosciences
sediment
nitrogen
nitrogen cycling
nitrification
Baltic Sea
nitrate reduction
denitrification
anammox
DNRA
Gulf of Finland
1172 Environmental sciences
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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