Testing the potential for improving quality of sediments impacted by mussel farms using bioturbating polychaete worms

Per Bergström, Marita Sundstein Carlsson, Mats Lindegarth, Jens Kjerulf Petersen, Susanne Lindegarth, Marianne Holmer

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Biodeposits from farmed mussels severely influence the biogeochemistry of sediments by increasing the levels of organic matter (OM). Mitigation of such negative impacts is important for the development of sustainable aquaculture operations. As a step towards developing methods for remediation of coastal sediments affected by mussel farming, the effects of the polychaete, Hediste diversicolor was evaluated experimentally. In a series of field‐ and laboratory experiments we tested hypotheses about the effects of polychaetes on sediment oxygen consumption, nutrient fluxes and sulphide pools under different polychaete densities and sedimentation regimes. The experimental results support the idea that polychaetes can mitigate negative effects on the benthic environment beneath mussel farms. H. diversicolor oxidized the sediment and generally enhanced the oxygen consumption, and thus the decomposition of OM. The accumulation of pore water sulphides were reduced and fluxes of nutrients across the sediment‐water interface increased. Additional calculations suggest that the effects of polychaetes were mainly indirect and driven by increased microbial activity due to the borrowing activity of the polychaetes. Trends of increasing decomposition with increasing polychaete density suggest that the decomposition could be further enhanced by higher densities. Overall, we concluded that H. diversicolor is a potentially strong candidate for remediation of mussel farm sediments. The results show that sediments inhabited by H. diversicolor have high assimilative capacity of OM and oxygen conditions are significantly improved following the addition of polychaetes at naturally occurring densities. However, technological developments are needed in order to allow the approach to be used in practice.
Original languageEnglish
JournalAquaculture Research
Volume48
Issue number1
Pages (from-to)161-176
ISSN1355-557X
DOIs
Publication statusPublished - 2017

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Bivalvia
polychaete
Farms
Polychaeta
mussels
Sediments
farm
farms
sediments
Testing
Oxygen Consumption
Biological materials
sediment
decomposition
oxygen consumption
organic matter
testing
Remediation
Decomposition
remediation

Cite this

Bergström, Per ; Carlsson, Marita Sundstein ; Lindegarth, Mats ; Petersen, Jens Kjerulf ; Lindegarth, Susanne ; Holmer, Marianne. / Testing the potential for improving quality of sediments impacted by mussel farms using bioturbating polychaete worms. In: Aquaculture Research. 2017 ; Vol. 48, No. 1. pp. 161-176.
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abstract = "Biodeposits from farmed mussels severely influence the biogeochemistry of sediments by increasing the levels of organic matter (OM). Mitigation of such negative impacts is important for the development of sustainable aquaculture operations. As a step towards developing methods for remediation of coastal sediments affected by mussel farming, the effects of the polychaete, Hediste diversicolor was evaluated experimentally. In a series of field‐ and laboratory experiments we tested hypotheses about the effects of polychaetes on sediment oxygen consumption, nutrient fluxes and sulphide pools under different polychaete densities and sedimentation regimes. The experimental results support the idea that polychaetes can mitigate negative effects on the benthic environment beneath mussel farms. H. diversicolor oxidized the sediment and generally enhanced the oxygen consumption, and thus the decomposition of OM. The accumulation of pore water sulphides were reduced and fluxes of nutrients across the sediment‐water interface increased. Additional calculations suggest that the effects of polychaetes were mainly indirect and driven by increased microbial activity due to the borrowing activity of the polychaetes. Trends of increasing decomposition with increasing polychaete density suggest that the decomposition could be further enhanced by higher densities. Overall, we concluded that H. diversicolor is a potentially strong candidate for remediation of mussel farm sediments. The results show that sediments inhabited by H. diversicolor have high assimilative capacity of OM and oxygen conditions are significantly improved following the addition of polychaetes at naturally occurring densities. However, technological developments are needed in order to allow the approach to be used in practice.",
author = "Per Bergstr{\"o}m and Carlsson, {Marita Sundstein} and Mats Lindegarth and Petersen, {Jens Kjerulf} and Susanne Lindegarth and Marianne Holmer",
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Testing the potential for improving quality of sediments impacted by mussel farms using bioturbating polychaete worms. / Bergström, Per; Carlsson, Marita Sundstein; Lindegarth, Mats; Petersen, Jens Kjerulf; Lindegarth, Susanne; Holmer, Marianne.

In: Aquaculture Research, Vol. 48, No. 1, 2017, p. 161-176.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Testing the potential for improving quality of sediments impacted by mussel farms using bioturbating polychaete worms

AU - Bergström, Per

AU - Carlsson, Marita Sundstein

AU - Lindegarth, Mats

AU - Petersen, Jens Kjerulf

AU - Lindegarth, Susanne

AU - Holmer, Marianne

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AB - Biodeposits from farmed mussels severely influence the biogeochemistry of sediments by increasing the levels of organic matter (OM). Mitigation of such negative impacts is important for the development of sustainable aquaculture operations. As a step towards developing methods for remediation of coastal sediments affected by mussel farming, the effects of the polychaete, Hediste diversicolor was evaluated experimentally. In a series of field‐ and laboratory experiments we tested hypotheses about the effects of polychaetes on sediment oxygen consumption, nutrient fluxes and sulphide pools under different polychaete densities and sedimentation regimes. The experimental results support the idea that polychaetes can mitigate negative effects on the benthic environment beneath mussel farms. H. diversicolor oxidized the sediment and generally enhanced the oxygen consumption, and thus the decomposition of OM. The accumulation of pore water sulphides were reduced and fluxes of nutrients across the sediment‐water interface increased. Additional calculations suggest that the effects of polychaetes were mainly indirect and driven by increased microbial activity due to the borrowing activity of the polychaetes. Trends of increasing decomposition with increasing polychaete density suggest that the decomposition could be further enhanced by higher densities. Overall, we concluded that H. diversicolor is a potentially strong candidate for remediation of mussel farm sediments. The results show that sediments inhabited by H. diversicolor have high assimilative capacity of OM and oxygen conditions are significantly improved following the addition of polychaetes at naturally occurring densities. However, technological developments are needed in order to allow the approach to be used in practice.

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