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Biogeochemistry in highly reduced mussel farm sediments during macrofaunal recolonization by Amphiura filiformis and Nephtys sp.

Journal article
Authors Stina Lindqvist
Karl Norling
Stefan Hulth
Published in Marine environmental research
Volume 67
Issue 3
Pages 136-45
ISSN 0141-1136
Publication year 2009
Published at Department of Chemistry
Department of Marine Ecology
Pages 136-45
Language en
Links dx.doi.org/10.1016/j.marenvres.2008...
Keywords Animals, Aquaculture, Bivalvia, physiology, Echinodermata, physiology, Geologic Sediments, analysis, Polychaeta, physiology, Seawater, analysis
Subject categories Chemical Sciences

Abstract

Mussel farming is considered a viable means for reducing coastal eutrophication. This study assessed the importance of bioturbation by recolonizing fauna for benthic solute fluxes and porewater distributions in manipulated mussel farm sediments. Three consecutive time-series flux incubations were performed during an experimental period of three weeks in sieved farm sediment treated with the brittle star Amphiura filiformis and the polychaete Nephtys sp. The functional behavior of Nephtys sp. and interactions between Nephtys sp. and the spontaneously colonizing spionid Malacoceros fuliginosus determined the biogeochemical response in the Nephtys sp. treatment. For example, the oxic zone was restricted and benthic nitrate and silicate fluxes were reduced compared to the brittle star treatment. A. filiformis seemed to enhance the bioadvective solute transport, although an increased supply of oxygen was due to the highly reducing conditions of the sediment mainly seen as secondary effects related to porewater distributions and benthic nutrient fluxes.

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