Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms
A flow-through experiment was conducted to study the effects of a simulated algal sedimentation (8.0 g C m-2) and the amphipod Monoporeia affinis (5000 ind. m-2) using well-oxidised sediment from the Gulf of Bothnia. Pore water nutrient profiles, nutrient fluxes, sediment denitrification and O2 cons...
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Online Access: | http://hdl.handle.net/10138/578200 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/578200 2024-09-15T18:00:09+00:00 Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms Autio, L. Mäkelä, K. Lehtonen, K. K. Kuparinen, J. Haahti, H. 2024-06-27T13:44:48Z 229-243 application/pdf http://hdl.handle.net/10138/578200 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 3 8 http://hdl.handle.net/10138/578200 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z A flow-through experiment was conducted to study the effects of a simulated algal sedimentation (8.0 g C m-2) and the amphipod Monoporeia affinis (5000 ind. m-2) using well-oxidised sediment from the Gulf of Bothnia. Pore water nutrient profiles, nutrient fluxes, sediment denitrification and O2 consumption as well as NH4+ excretion of M. affinis were followed for 7 days. After the algal enrichment, the NO3- concentration fell to near zero in the pore water and a decrease in the denitrification rate was observed. This occurred since the concentration of NO3- in the flow-through water was low and coupled nitrification-denitrification formed the main denitrification pathway. The share of denitrification compared to other loss processes of N from the sediment reduced from 37% in the control cores to 0.7% in the algae treated cores. The efflux of NH4+ from the sediment formed 99% of the total loss of N in the algae treated cores. A massive efflux of NH4+ and PO43- was observed after the algal enrichment. The amphipods did not increase denitrification. Article in Journal/Newspaper Boreal Environment Research HELDA – University of Helsinki Open Repository |
institution |
Open Polar |
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HELDA – University of Helsinki Open Repository |
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ftunivhelsihelda |
language |
English |
description |
A flow-through experiment was conducted to study the effects of a simulated algal sedimentation (8.0 g C m-2) and the amphipod Monoporeia affinis (5000 ind. m-2) using well-oxidised sediment from the Gulf of Bothnia. Pore water nutrient profiles, nutrient fluxes, sediment denitrification and O2 consumption as well as NH4+ excretion of M. affinis were followed for 7 days. After the algal enrichment, the NO3- concentration fell to near zero in the pore water and a decrease in the denitrification rate was observed. This occurred since the concentration of NO3- in the flow-through water was low and coupled nitrification-denitrification formed the main denitrification pathway. The share of denitrification compared to other loss processes of N from the sediment reduced from 37% in the control cores to 0.7% in the algae treated cores. The efflux of NH4+ from the sediment formed 99% of the total loss of N in the algae treated cores. A massive efflux of NH4+ and PO43- was observed after the algal enrichment. The amphipods did not increase denitrification. |
format |
Article in Journal/Newspaper |
author |
Autio, L. Mäkelä, K. Lehtonen, K. K. Kuparinen, J. Haahti, H. |
spellingShingle |
Autio, L. Mäkelä, K. Lehtonen, K. K. Kuparinen, J. Haahti, H. Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms |
author_facet |
Autio, L. Mäkelä, K. Lehtonen, K. K. Kuparinen, J. Haahti, H. |
author_sort |
Autio, L. |
title |
Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms |
title_short |
Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms |
title_full |
Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms |
title_fullStr |
Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms |
title_full_unstemmed |
Effects of algal sedimentation and Monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms |
title_sort |
effects of algal sedimentation and monoporeia affinis on nutrient fluxes, pore water profiles and denitrification in sediment microcosms |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/578200 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 3 8 http://hdl.handle.net/10138/578200 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1810437286898171904 |