TY - JOUR
TI - Dredging-induced turbid plumes affect bio-irrigation and biogeochemistry in sediments inhabited by Lanice conchilega 
AU - Mestdagh, S
AU - Ysebaert, T
AU - Moens, T
AU - van Colen, C
T2 - ICES Journal of Marine Science
AB - 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.
DA - 2018/09//
PY - 2018
VL - 77
IS - 3
SP - 1219
EP - 1226
UR - https://academic.oup.com/icesjms/advance-article/doi/10.1093/icesjms/fsy122/5094980
DO - 10.1093/icesjms/fsy122
LA - English
KW - Wind Energy
KW - Fixed Offshore Wind
KW - Habitat Change
KW - Physical Environment
KW - Sediment Transport
KW - Invertebrates
ER -