Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach

Christian Lønborg; Stiig Markager; Simon David Herzog; Catia Carreira; Signe Høgslund

doi:10.1016/j.ecss.2024.108981

Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach

Christian Lønborg^*, Stiig Markager, Simon David Herzog, Catia Carreira, Signe Høgslund

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

Abstract

Globally coastal sediments are frequently disturbed by a wide range of physical anthropogenic processes (e.g. bottom trawling) which causes resuspension of sediment organic matter (OM) into the overlaying water column. In this study we present experimental results showing that anthropogenic sediment resuspension decreases the organic carbon (14x) and nitrogen (3x) content in the sediment material resuspended to the water column, while no measurable response was found for organic phosphorus. Our findings furthermore show that the OM bioavailability decreased and the Carbon:Nitrogen:Phosphorus stoichiometry was changed suggesting that anthropogenic resuspension changes the chemical composition, and/or production and degradation pathways of the OM pool. The detected changes in OM biogeochemistry could affect nutrient release, fuel oxygen consumption and at the same time increase CO₂ production in coastal waters.

Original language	English
Article number	108981
Journal	Estuarine, Coastal and Shelf Science
Volume	310
ISSN	0272-7714
DOIs	https://doi.org/10.1016/j.ecss.2024.108981
Publication status	Published - 15 Dec 2024

Keywords

Biogeochemistry
Bottom trawling
Coastal waters
Dredging
Organic matter
Resuspension

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10.1016/j.ecss.2024.108981

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title = "Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach",

abstract = "Globally coastal sediments are frequently disturbed by a wide range of physical anthropogenic processes (e.g. bottom trawling) which causes resuspension of sediment organic matter (OM) into the overlaying water column. In this study we present experimental results showing that anthropogenic sediment resuspension decreases the organic carbon (14x) and nitrogen (3x) content in the sediment material resuspended to the water column, while no measurable response was found for organic phosphorus. Our findings furthermore show that the OM bioavailability decreased and the Carbon:Nitrogen:Phosphorus stoichiometry was changed suggesting that anthropogenic resuspension changes the chemical composition, and/or production and degradation pathways of the OM pool. The detected changes in OM biogeochemistry could affect nutrient release, fuel oxygen consumption and at the same time increase CO2 production in coastal waters.",

keywords = "Biogeochemistry, Bottom trawling, Coastal waters, Dredging, Organic matter, Resuspension",

author = "Christian L{\o}nborg and Stiig Markager and Herzog, {Simon David} and Catia Carreira and Signe H{\o}gslund",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors",

year = "2024",

month = dec,

day = "15",

doi = "10.1016/j.ecss.2024.108981",

language = "English",

volume = "310",

journal = "Estuarine, Coastal and Shelf Science",

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Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach. / Lønborg, Christian ; Markager, Stiig; Herzog, Simon David et al.
In: Estuarine, Coastal and Shelf Science, Vol. 310, 108981, 15.12.2024.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Impacts of anthropogenic resuspension on sediment organic matter

T2 - An experimental approach

AU - Lønborg, Christian

AU - Markager, Stiig

AU - Herzog, Simon David

AU - Carreira, Catia

AU - Høgslund, Signe

PY - 2024/12/15

Y1 - 2024/12/15

N2 - Globally coastal sediments are frequently disturbed by a wide range of physical anthropogenic processes (e.g. bottom trawling) which causes resuspension of sediment organic matter (OM) into the overlaying water column. In this study we present experimental results showing that anthropogenic sediment resuspension decreases the organic carbon (14x) and nitrogen (3x) content in the sediment material resuspended to the water column, while no measurable response was found for organic phosphorus. Our findings furthermore show that the OM bioavailability decreased and the Carbon:Nitrogen:Phosphorus stoichiometry was changed suggesting that anthropogenic resuspension changes the chemical composition, and/or production and degradation pathways of the OM pool. The detected changes in OM biogeochemistry could affect nutrient release, fuel oxygen consumption and at the same time increase CO2 production in coastal waters.

AB - Globally coastal sediments are frequently disturbed by a wide range of physical anthropogenic processes (e.g. bottom trawling) which causes resuspension of sediment organic matter (OM) into the overlaying water column. In this study we present experimental results showing that anthropogenic sediment resuspension decreases the organic carbon (14x) and nitrogen (3x) content in the sediment material resuspended to the water column, while no measurable response was found for organic phosphorus. Our findings furthermore show that the OM bioavailability decreased and the Carbon:Nitrogen:Phosphorus stoichiometry was changed suggesting that anthropogenic resuspension changes the chemical composition, and/or production and degradation pathways of the OM pool. The detected changes in OM biogeochemistry could affect nutrient release, fuel oxygen consumption and at the same time increase CO2 production in coastal waters.

KW - Biogeochemistry

KW - Bottom trawling

KW - Coastal waters

KW - Dredging

KW - Organic matter

KW - Resuspension

UR - http://www.scopus.com/inward/record.url?scp=85206670963&partnerID=8YFLogxK

U2 - 10.1016/j.ecss.2024.108981

DO - 10.1016/j.ecss.2024.108981

M3 - Journal article

AN - SCOPUS:85206670963

SN - 0272-7714

VL - 310

JO - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

M1 - 108981

ER -

Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach

Abstract

Keywords

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