Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Fate of contaminants in Baltic Sea sediment ecosystems : the role of bioturbation
Stockholm University, Faculty of Science, Department of Systems Ecology.
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Aquatic sediments are of major importance for the cycling of environmental pollutants, acting as both sinks and secondary sources of contaminants to the ecosystem. Sediment-living organisms can affect the fate and transport of contaminants through activities like feeding and burrowing, collectively called bioturbation. Apart from high contaminant levels, the Baltic benthic ecosystem is affected by stressors such as eutrophication-induced anoxic conditions and invading alien species. The main objectives of this thesis were to determine the effects of bioturbation on contaminant fluxes in Baltic Sea sediments and to increase the understanding of how these other stressors act together upon contaminant fate in the benthic ecosystem.

Bioturbation affected contaminants in a species-specific way. The native species Monoporeia affinis and Macoma balthica increased the incorporation of BDE-99 and Cd deposited on the sediment surface, enhancing their retention in the sediment. The invasive polychaete Marenzelleria sp. did not contribute to the incorporation of surface-deposited contaminants, however, significantly increased the release of contaminants back to the water column. Reoxygenation of anoxic laminated sediments and bioturbation by Marenzelleria increased the sediment-to-water flux of dissolved organic contaminants. When the bioturbation-driven release of PCB was compared to the release caused by physical sediment resuspension, results indicated that the continuous activities of benthic infauna can be just as, or even more, important than physical disturbance for the remobilization of sediment-bound contaminants. Bioaccumulation was significantly higher when contaminants were deposited associated to phytoplankton compared to lignin or sediment, suggesting that there are likely seasonal differences in the mobilization of contaminants in the benthic ecosystem.

In summary, bioturbation is an important process influencing contaminant fate in Baltic Sea sediments, and the risk of remobilization of historically buried contaminants may increase with improved benthic redox conditions and the invasion of new deeper-digging species, such as Marenzelleria.

Place, publisher, year, edition, pages
Stockholm: Systemekologiska institutionen , 2008. , 37 p.
Keyword [en]
Toxicology
Keyword [sv]
Toxikologi
National Category
Environmental Sciences
Research subject
Marine Ecotoxicology
Identifiers
URN: urn:nbn:se:su:diva-8315ISBN: 978-91-7155-775-9 (print)OAI: oai:DiVA.org:su-8315DiVA: diva2:200073
Public defence
2008-12-12, sal G, Arrheniuslaboratorierna, Svante Arrhenius väg 14-18, Stockholm, 09:00
Opponent
Supervisors
Available from: 2008-11-20 Created: 2008-11-14 Last updated: 2012-05-25Bibliographically approved
List of papers
1. Fate of contaminants in Baltic Sea sediments: role of bioturbation and settling organic matter
Open this publication in new window or tab >>Fate of contaminants in Baltic Sea sediments: role of bioturbation and settling organic matter
Show others...
2008 (English)In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 356, 25-38 p.Article in journal (Refereed) Published
Abstract [en]

This experimental study examined the interactive effects of bioturbation and settling organic matter (OM) on the fate (burial and remobilisation) of 2 surface-deposited contaminants in Baltic Sea sediment: the metal Cd and a hydrophobic organic pollutant, the flame retardant BDE-99. Three macrofaunal species with diverse feeding and bioturbation strategies were used: the amphipod Monoporeia affinis, the clam Macoma balthica and the polychaete Marenzelleria spp. Radiolabelled contaminants were added to the sediment surface in association with 3 different OM types: (1) phytoplankton, (2) terrestrial lignin and (3) Baltic sediment. Bioturbation by all species increased the retention of both contaminants in the sediment, most effectively M. affinis and M. balthica. A decoupled transport of Cd and BDE-99 by Marenzelleria was observed. Generally, Marenzelleria buried the highest amount of Cd into the sediment but also caused the highest remobilisation to the water, indicating an effective transport of (soluble) Cd over the sediment-water interface via bio-irrigation. Lack of the highly hydrophobic and mainly particle-associated BDE-99 below the sediment surface suggests that Marenzelleria caused no significant particle mixing. The addition of various OM types significantly affected the distribution of Cd, but not of BDE-99. There was an interactive effect between bioturbation (species) and OM type, generally showing an increased burial and release of Cd when associated with phytoplankton in the presence of Marenzelleria. Our results emphasise the importance of understanding the complex interactions between ecological (e.g. infaunal feeding and bioturbation activities) and physiochemical processes (contaminant speciation and sorption kinetics) when assessing the fate of contaminants in aquatic ecosystems.

Keyword
Cadmium, BDE-99, HOC, POP, Flame retardant, Marenzelleria spp., Macoma balthica, Monoporeia affinis, Remobilisation
National Category
Biological Sciences
Identifiers
urn:nbn:se:su:diva-25621 (URN)10.3354/meps07218 (DOI)
Available from: 2008-11-20 Created: 2008-11-14 Last updated: 2012-02-13Bibliographically approved
2. Effects of settling organic matter on the bioaccumulation of cadmium and BDE-99 by Baltic Sea benthic invertebrates
Open this publication in new window or tab >>Effects of settling organic matter on the bioaccumulation of cadmium and BDE-99 by Baltic Sea benthic invertebrates
Show others...
2008 In: Marine Environmental Research, ISSN 0141-1136, Vol. 65, no 3, 264-281 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25622 (URN)000254821700005 ()
Note
Part of urn:nbn:se:su:diva-8315Available from: 2008-11-20 Created: 2008-11-14Bibliographically approved
3. Remobilization of PCB from Baltic Sea sediment: comparing the roles of bioturbation and physical resuspension
Open this publication in new window or tab >>Remobilization of PCB from Baltic Sea sediment: comparing the roles of bioturbation and physical resuspension
2009 (English)In: Environmental Toxicology and Chemistry, ISSN 0730-7268, E-ISSN 1552-8618, Vol. 28, no 11, 2241-2249 p.Article in journal (Refereed) Published
Abstract [en]

The release of a 14C-labeled trichlorobiphenyl compound ([14C]PCB 32) from sediment to water was quantified weekly in a 30-d microcosm experiment with recirculating water. Two modes of bioturbation-driven polychlorinated biphenyl (PCB) release—bioturbation by the amphipod Monoporeia affinis (a particle biodiffuser) and bioturbation by the polychaete Marenzelleria sp. (a bioirrigator)—were compared to the PCB release caused by physical resuspension of the sediment generated by a motor-driven paddle used twice a week. Bioturbation by the amphipod M. affinis caused a significantly higher remobilization of both particle-associated PCB (PCBpart) and dissolved PCB (PCBdiss) than the other treatments. Bioturbation by Marenzelleria sp. and physical resuspension caused a similar release of PCBdiss despite a significantly higher amount of total suspended solids in the water column after physical resuspension. In all treatments, the release of PCBdiss was more than one order of magnitude higher than that of PCBpart, indicating a significant potential route of exposure for pelagic organisms, such as fish, to the most bioavailable PCB form. Calculated mass-transfer coefficients (0.3–1.3 cm/d) correspond to previously reported values for trichlorinated PCBs. The present results indicate that biological reworking of sediments can be just as, or even more, important than physical resuspension for the remobilization of sediment-bound contaminants.

Place, publisher, year, edition, pages
SETAC, 2009
Keyword
* Flux; * Pollutant; * Benthos; * Invasive species; * Mechanical disturbance
National Category
Environmental Sciences
Identifiers
urn:nbn:se:su:diva-25623 (URN)10.1897/08-576.1 (DOI)000270846900001 ()
Note
Part of urn:nbn:se:su:diva-8315Available from: 2008-11-20 Created: 2008-11-14 Last updated: 2010-09-15Bibliographically approved
4. Bioturbation-Driven Release of Organic Contaminants from Baltic Sea Sediments Mediated by the Invading Polychaete Marenzelleria neglecta.
Open this publication in new window or tab >>Bioturbation-Driven Release of Organic Contaminants from Baltic Sea Sediments Mediated by the Invading Polychaete Marenzelleria neglecta.
Show others...
2008 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 42, no 4, 1058-1065 p.Article in journal (Refereed) Published
Abstract [en]

Baltic Sea sediments are among the world’s most polluted regarding eutrophication and contamination. Eutrophication-induced hypoxia has caused depletion of bioturbating macrofauna in vast areas, producing laminated sediments. We investigated if reoxygenation and colonization by the invading deep-burrowing polychaete Marenzelleria neglecta may cause an augmented contaminant release from Baltic Sea sediments. Intact laminated sediment cores were exposed either to in situ hypoxia, reoxygenation, or reoxygenation combined with bioturbating M. neglecta. The release fluxes of particle-associated (NPart) and dissolved (NDiss) PCBs and chlorinated pesticide residues (POPs) were quantified (GC-ECD) after 85 d along with contaminant concentrations in sediment and biota. Lavoisier-based mass transfer coefficients (Kf) were calculated from NDiss. Sediment contaminant concentrations were high (ΣPCB7: 42–52 ng gsediment−1 dw) due to emissions from Stockholm. NDiss always exceeded NPart by an order of magnitude. Bioturbation enhanced NDiss and Kf from hypoxic sediments 0.7 – 3 times while reoxygenation alone had no significant effect. M. neglecta accumulated low amounts of contaminants but significantly stimulated aquatic release of bioavailable sequestered contaminants. Bioturbation should be included in aquatic contaminant fate models. We advise to consider quiescent pollutant sources and possible ecological shifts when aiming to restore eutrophicated aquatic environments.

National Category
Ecology
Identifiers
urn:nbn:se:su:diva-15609 (URN)doi:10.1021/es071607j (DOI)000253250800019 ()18351072 (PubMedID)
Available from: 2008-12-06 Created: 2008-12-06 Last updated: 2012-05-25Bibliographically approved
5. Sediment particle reworking and solute transport by two common polychaetes in the Baltic Sea, Nereis diversicolor and Marenzelleria sp.
Open this publication in new window or tab >>Sediment particle reworking and solute transport by two common polychaetes in the Baltic Sea, Nereis diversicolor and Marenzelleria sp.
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25625 (URN)
Note
Part of urn:nbn:se:su:diva-8315Available from: 2008-11-20 Created: 2008-11-14 Last updated: 2010-01-13Bibliographically approved

Open Access in DiVA

fulltext(425 kB)1146 downloads
File information
File name FULLTEXT01.pdfFile size 425 kBChecksum SHA-1
b7d6edf97a9dc05c76ae9c70d3fc513c568177b472f668e7d381efc0de5c45d4e83e1159
Type fulltextMimetype application/pdf

By organisation
Department of Systems Ecology
Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 1146 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 801 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf