Sediment properties, biota and local habitat structure explain variation in the erodibility of coastal sediments

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Joensuu , L A M , Pilditch , C A , Harris , R , Hietanen , S S , Pettersson , H & Norkko , A M 2018 , ' Sediment properties, biota and local habitat structure explain variation in the erodibility of coastal sediments ' , Limnology and Oceanography , vol. 63 , no. 1 , pp. 173-186 . https://doi.org/10.1002/lno.10622

Title: Sediment properties, biota and local habitat structure explain variation in the erodibility of coastal sediments
Author: Joensuu, Laura Anne Mari; Pilditch, Conrad A.; Harris, Rachel; Hietanen, Siru Susanna; Pettersson, Heidi; Norkko, Alf Mattias
Contributor: University of Helsinki, Environmental Sciences
University of Helsinki, Environmental Sciences
University of Helsinki, Tvärminne Zoological Station
Date: 2018-01
Language: eng
Number of pages: 14
Belongs to series: Limnology and Oceanography
ISSN: 0024-3590
URI: http://hdl.handle.net/10138/233500
Abstract: Sediment resuspension is a frequent phenomenon in coastal areas and a key driver for many ecosystem functions. Sediment resuspension is often linked to biological and anthropogenic activities, which in combination with hydrodynamic forcing initiate sediment erosion and resuspension, if the erosion threshold (tau(c)) is exceeded. Despite its importance to ecosystem functions very few studies have provided measurements on natural assemblages for subtidal sediments. The aim of this study was to determinate key environmental variables regulating sediment resuspension potential across a sedimentary gradient in a subtidal coastal environment. In order to explore this, we sampled 16 sites encompassing a wide variety in environmental variables (e.g., grain size distribution, macrofaunal communities, vegetation) in the Gulf of Finland, Baltic Sea. A core-based erosion device (EROMES) was used to determine sediment resuspension potential measures of erosion threshold, erosion rate (ER), and erosion constant (m(e)). Based on abiotic and biotic properties sampled, sediments diverged into two distinct groups; cohesive (muddy) and noncohesive (sandy) sediments. Results showed that abiotic sediment properties explained 38-53% and 15-36% of the total variation in resuspension potential measures in muddy and sandy sediments, respectively. In cumulative models, biota accounted for 12-26% and 6-24% to the total variation in muddy and sandy sediments, respectively. Sediment erodibility and resuspension potential of natural sediments is highly variable from local habitats to a larger seascape scale. Our results underline the importance of biota to resuspension potential measures in spatially variable environments.
Subject: 1181 Ecology, evolutionary biology
DANISH WADDEN SEA
BALTIC SEA
INTERTIDAL SEDIMENTS
BULK-DENSITY
EROSION
RESUSPENSION
TRANSPORT
ESTUARIES
DYNAMICS
FINLAND
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