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Dredging-induced turbid plumes affect bio-irrigation and biogeochemistry in sediments inhabited by Lanice conchilega (Pallas, 1766)

Sebastiaan Mestdagh (UGent) , Tom Ysebaert, Tom Moens (UGent) and Carl Van Colen (UGent)
Author
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Abstract
Building man-made structures in coastal seas are often preceded by dredging operations, inducing turbid plumes of suspended sediment. To study the effects of such high-concentration sediment plumes on the suspension-feeding polychaete Lanice conchilega, a laboratory experiment was performed, in which individuals of L. conchilega were exposed to natural seawater with a suspended sediment concentration (SSC) of ~0.3 g l-1 and treatments with elevated SSC of 5 and 1 g l-1, representing concentrations in a dredging plume at the moment of sediment release and after initial dilution, respectively. We measured clearance rates of sediment particles, biogeochemical fluxes, and bio-irrigation. While clearance rates and nitrite efflux significantly increased in both treatments with elevated SSC compared with the control, bio-irrigation increased at 1 g l-1 but was lowest at 5 g l-1. It is suggested that piston-pumping is intensified under intermediate concentrations to remove sediment, but ceases under high concentrations are due to sediment ingestion. By transporting oxygen into the sediment, bio-irrigation enhances aerobic microbial processes, among which nitrification. We conclude that short-term extreme suspended sediment concentrations can have a significant impact on the biogeochemistry of the seabed through changes in behaviour of L. conchilega.
Keywords
biogeochemistry, bio-irrigation, dredging, Lanice conchilega, SSC, suspension feeding

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Chicago
Mestdagh, Sebastiaan, Tom Ysebaert, Tom Moens, and Carl Van Colen. 2019. “Dredging-induced Turbid Plumes Affect Bio-irrigation and Biogeochemistry in Sediments Inhabited by Lanice Conchilega (Pallas, 1766).” Ices Journal of Marine Science.
APA
Mestdagh, Sebastiaan, Ysebaert, T., Moens, T., & Van Colen, C. (2019). Dredging-induced turbid plumes affect bio-irrigation and biogeochemistry in sediments inhabited by Lanice conchilega (Pallas, 1766). ICES JOURNAL OF MARINE SCIENCE.
Vancouver
1.
Mestdagh S, Ysebaert T, Moens T, Van Colen C. Dredging-induced turbid plumes affect bio-irrigation and biogeochemistry in sediments inhabited by Lanice conchilega (Pallas, 1766). ICES JOURNAL OF MARINE SCIENCE. 2019;
MLA
Mestdagh, Sebastiaan, Tom Ysebaert, Tom Moens, et al. “Dredging-induced Turbid Plumes Affect Bio-irrigation and Biogeochemistry in Sediments Inhabited by Lanice Conchilega (Pallas, 1766).” ICES JOURNAL OF MARINE SCIENCE (2019): n. pag. Print.
@article{8573568,
  abstract     = {Building man-made structures in coastal seas are often preceded by dredging operations, inducing turbid plumes of suspended sediment. To study the effects of such high-concentration sediment plumes on the suspension-feeding polychaete Lanice conchilega, a laboratory experiment was performed, in which individuals of L. conchilega were exposed to natural seawater with a suspended sediment concentration (SSC) of {\texttildelow}0.3 g l-1 and treatments with elevated SSC of 5 and 1 g l-1, representing concentrations in a dredging plume at the moment of sediment release and after initial dilution, respectively. We measured clearance rates of sediment particles, biogeochemical fluxes, and bio-irrigation. While clearance rates and nitrite efflux significantly increased in both treatments with elevated SSC compared with the control, bio-irrigation increased at 1 g l-1 but was lowest at 5 g l-1. It is suggested that piston-pumping is intensified under intermediate concentrations to remove sediment, but ceases under high concentrations are due to sediment ingestion. By transporting oxygen into the sediment, bio-irrigation enhances aerobic microbial processes, among which nitrification. We conclude that short-term extreme suspended sediment concentrations can have a significant impact on the biogeochemistry of the seabed through changes in behaviour of L. conchilega.},
  author       = {Mestdagh, Sebastiaan and Ysebaert, Tom and Moens, Tom and Van Colen, Carl},
  issn         = {1054-3139},
  journal      = {ICES JOURNAL OF MARINE SCIENCE},
  language     = {eng},
  title        = {Dredging-induced turbid plumes affect bio-irrigation and biogeochemistry in sediments inhabited by Lanice conchilega (Pallas, 1766)},
  url          = {http://dx.doi.org/10.1093/icesjms/fsy122},
  year         = {2019},
}

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