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• W2020938932 endingPage "e44114" @default.
• W2020938932 startingPage "e44114" @default.
• W2020938932 abstract "Recovery from disturbance in deep water is poorly understood, but as anthropogenic impacts increase in deeper water it is important to quantify the process. Exploratory hydrocarbon drilling causes physical disturbance, smothering the seabed near the well. Video transects obtained by remotely operated vehicles were used to assess the change in invertebrate megafaunal density and diversity caused by drilling a well at 380 m depth in the Norwegian Sea in 2006. Transects were carried out one day before drilling commenced and 27 days, 76 days, and three years later. A background survey, further from the well, was also carried out in 2009. Porifera (45% of observations) and Cnidaria (40%) dominated the megafauna. Porifera accounted for 94% of hard-substratum organisms and cnidarians (Pennatulacea) dominated on the soft sediment (78%). Twenty seven and 76 days after drilling commenced, drill cuttings were visible, extending over 100 m from the well. In this area there were low invertebrate megafaunal densities (0.08 and 0.10 individuals m(-2)) in comparison to pre-drill conditions (0.21 individuals m(-2)). Three years later the visible extent of the cuttings had reduced, reaching 60 m from the well. Within this area the megafaunal density (0.05 individuals m(-2)) was lower than pre-drill and reference transects (0.23 individuals m(-2)). There was a significant increase in total megafaunal invertebrate densities with both distance from drilling and time since drilling although no significant interaction. Beyond the visible disturbance there were similar megafaunal densities (0.14 individuals m(-2)) to pre-drilling and background surveys. Species richness, Shannon-Weiner diversity and multivariate techniques showed similar patterns to density. At this site the effects of exploratory drilling on megafaunal invertebrate density and diversity seem confined to the extent of the visible cuttings pile. However, elevated Barium concentration and reduced sediment grain size suggest persistence of disturbance for three years, with unclear consequences for other components of the benthic fauna." @default.
• W2020938932 created "2016-06-24" @default.
• W2020938932 creator A5023507982 @default.
• W2020938932 creator A5061270297 @default.
• W2020938932 date "2012-10-08" @default.
• W2020938932 modified "2023-09-26" @default.
• W2020938932 title "Recovery of Benthic Megafauna from Anthropogenic Disturbance at a Hydrocarbon Drilling Well (380 m Depth in the Norwegian Sea)" @default.
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• W2020938932 doi "https://doi.org/10.1371/journal.pone.0044114" @default.
• W2020938932 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3466215" @default.
• W2020938932 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23056177" @default.
• W2020938932 hasPublicationYear "2012" @default.
• W2020938932 type Work @default.

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