Seafloor deposition of water -based drill cuttings generates distinctive and lengthy sediment bacterial community changes

MARINE POLLUTION BULLETIN

卷:164

Article

Nguyen, Tan T.^1,3  Paulsen, John E.²  Landfald, Bjarne¹ 

[1] UiT Arctic Univ Norway, Norwegian Coll Fishery Sci, POB 6050, N-9037 Tromso, Norway

[2] Var Energi, Vestre Svanholmen 1, N-4313 Sandnes, Norway

[3] Norwegian Univ Life Sci, Fac Life Sci, N-1433 As, Norway

关键词: Drill cutting;    Sediment;    Microbiota;    Barents Sea;    Bioindicator;   

DOI  :  10.1016/j.marpolbul.2021.111987

来源: Elsevier

【 摘 要 】

The spatial extent and persistence of bacterial change caused by deposition of water-based drill cuttings on the seafloor were explored by a community-wide approach. Ten centimeter sediment cores were sampled along transects extending from ?15 m to 250 m from three nearby drilling sites in the southern Barents Sea. Eight months, 8 years and 15 years, respectively, had passed since the completion of the drillings. At locations heavily affected by drill cuttings, the two most recent sites showed distinct, corresponding deviances from native Barents Sea bacterial community profiles. Otherwise marginal groups, including Mollicutes and Clostridia, showed sig-nificant increases in relative abundance. Beyond 100 m from the boreholes the microbiotas appeared undis-turbed, as they did at any distance from the 15-years old borehole. The extent of the biological distortion, as indicated by the present microbial study, agreed with previously published macrofaunal surveys at the same drilling sites.

【 授权许可】

Free