Document of bibliographic reference 322655

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

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

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.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000562460200032

Bibliographic citation

Mestdagh, S.; Ysebaert, T.; Moens, T.; Van Colen, C. (2020). Dredging-induced turbid plumes affect bio-irrigation and biogeochemistry in sediments inhabited by Lanice conchilega (Pallas, 1766). ICES J. Mar. Sci./J. Cons. int. Explor. Mer 77(3): 1219-1226. https://dx.doi.org/10.1093/icesjms/fsy122

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true