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    Gates, Andrew R. Benfield, Mark C. Booth, David J. Fowler, Ashley M. Skropeta, Danielle and Jones, Daniel O.B. 2016. Deep-seaobservations at hydrocarbon drilling locations: Contributions from the SERPENT Project after 120 field visits. Deep Sea Research Part II: Topical Studies in Oceanography,

  • Journal of the Marine Biological Association of the United Kingdom, Volume 92, Issue 2
  • March 2012, pp. 245-253

Effects of oil drilling activity on the deep water megabenthos of the Orinoco Fan, Venezuela

  • Daniel O.B. Jones (a1), Juan J. Cruz-Motta (a2), David Bone (a3) and Janne I. Kaariainen (a1)
  • DOI:
  • Published online: 19 August 2011

The response of a deep-water megafaunal assemblage to sedimentation disturbance from hydrocarbon drilling was investigated using remotely operated vehicle video off the Atlantic coast of Venezuela. This was the first assessment of megafauna in bathyal waters in this region. A two-way analysis of variance (ANOVA) design was used to assess patterns in density and assemblage structure both temporally, before and after the drilling event, and spatially, at different distances from the disturbance. High levels of sedimentation occurred within a radius of 20 to 50 m from the drilling site. Megafaunal densities were reduced with high levels of disturbance (from 0.60 m−2 to 0.17 m−2 <20 m from the drilling site). The responses of motile and sessile fauna were different. Sessile fauna were most common (77% total) and reflected trends for total density. Motile megafaunal density was generally higher after drilling (up to double the pre-drill density). Species richness was reduced by disturbance and proximity to the disturbance. Multivariate ANOVA revealed significant differences in assemblage composition with distance and before and after drilling but no interaction. This was most likely a result of variable species-specific responses to disturbance. Megafaunal densities were generally much higher than reported densities from comparable depths in the Gulf of Mexico or from deeper locations in the Caribbean Sea. The responses to sedimentation disturbance were generally less obvious than observed elsewhere and may result from the fauna being adapted to the naturally high levels of sedimentation deriving from the Orinoco River.

Corresponding author
Correspondence should be addressed to: D.O.B. Jones, National Oceanography Centre, European Way, Southampton, SO14 3ZH, UK email:
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M.J. Anderson (2001) A new method for non-parametric multivariate analysis of variance. Austral Ecology 26, 3246.

B.H. Baird and D.C. White (1985) Biomass and community structure of the abyssal microbiota determined from the ester-linked phospholipids recovered from Venezuela Basin and Puerto Rico Trench sediments. Marine Geology 68, 217231.

B.J. Bett , M.G. Malzone , B.E. Narayanaswamy and B.D. Wigham (2001) Temporal variability in phytodetritus and megabenthic activity at the seabed in the deep Northeast Atlantic. Progress in Oceanography 50, 349368.

D.S.M. Billett , B.J. Bett , A.L. Rice , M.H. Thurston , J. Galeron , M. Sibuet and G.A. Wolff (2001) Long-term change in the megabenthos of the Porcupine Abyssal Plain (NE Atlantic). Progress in Oceanography 50, 325348.

H. Bluhm (1994) Monitoring megabenthic communities in abyssal manganese nodule sites of the East Pacific Ocean in association with commercial deep-sea mining. Aquatic Conservation: Marine and Freshwater Ecosystems 4, 187201.

H. Bluhm (2001) Re-establishment of an abyssal megabenthic community after experimental physical disturbance of the seafloor. Deep-Sea Research Part II: Topical Studies in Oceanography 48, 38413868.

D. Bone and G. San Martin (2003) Ecological aspects of syllids (Annelida: Polychaeta: Syllidae) on Thalassia testudinum beds in Venezuela. Hydrobiologia 496, 289298.

J. Bonilla , W. Senior , J. Bugden , O. Zafiriou and R. Jones (1993) Seasonal distribution of nutrients and primary productivity on the eastern continental-shelf of Venezuela as influenced by the Orinoco River. Journal of Geophysical Research—Oceans 98, 22452257.

F.A. Bowles and P. Fleischer (1985) Orinoco and Amazon River sediment input to the eastern Caribbean Basin. Marine Geology 68, 5372.

J.R. Bray and J.T. Curtis (1957) An ordination of the upland forest of southern Wisconsin. Ecological Monographs 27, 225349.

K.B. Briggs , M.D. Richardson and D.K. Young (1996) The classification and structure of megafaunal assemblages in the Venezuela Basin, Caribbean Sea. Journal of Marine Research 54, 705730.

J.J. Childress (1995) Are there physiological and biochemical adaptations of metabolism in deep-sea animals? Trends in Ecology and Evolution 10, 136.

K.R. Clarke (1993) Nonparametric multivariate analyses of changes in community structure. Australian Journal of Ecology 18, 117143.

K.M. Dernie , M.J. Kaiser , E.A. Richardson and R.M. Warwick (2003) Recovery of soft sediment communities and habitats following physical disturbance. Journal of Experimental Marine Biology and Ecology 285–286, 415434.

J.G. Field , K.R. Clarke and R.M. Warwick (1982) A practical strategy for analysing multispecies distribution patterns. Marine Ecology Progress Series 8, 3752.

J.B. Hughes and O.L. Petchey (2001) Merging perspectives on biodiversity and ecosystem functioning. Trends in Ecology and Evolution 16, 222223.

D.O.B. Jones , B.J. Bett and P.A. Tyler (2007a) Depth-related changes in the Arctic epibenthic megafaunal assemblages of Kangerdlugssuaq, East Greenland. Marine Biology Research 3, 191204.

D.O.B. Jones , I.R. Hudson and B.J. Bett (2006) Effects of physical disturbance on the cold-water megafaunal communities of the Faroe–Shetland Channel. Marine Ecology Progress Series 319, 4354.

D.O.B. Jones , B.D. Wigham , I.R. Hudson and B.J. Bett (2007b) Anthropogenic disturbance of deep-sea megabenthic assemblages: a study with remotely-operated vehicles in the Faroe–Shetland Chanel, NE Atlantic. Marine Biology 151, 17311741.

H. Kukert and C.R. Smith (1992) Disturbance, colonization and succession in a deep-sea sediment community: artificial-mound experiments. Deep-Sea Research Part A. Oceanographic Research Papers 39, 13491371.

R.S. Lampitt , B.J. Bett , K. Kiriakoulakis , E.E. Popova , O. Ragueneau , A. Vangriesheim and G.A. Wolff (2001) Material supply to the abyssal seafloor in the northeast Atlantic. Progress in Oceanography 50, 2763.

W.E. Pequegnat , B.J. Gallaway and L.H. Pequegnat (1990) Aspects of the ecology of the deep water fauna of the Gulf of Mexico. American Zoologist 30, 4564.

D. Pinder (2001) Offshore oil and gas: global resource knowledge and technological change. Ocean and Coastal Management 44, 579600.

M.D. Richardson , K.B. Briggs and D.K. Young (1985) Effects of biological activity by abyssal benthic macroinvertebrates on a sedimentary structure in the Venezuela Basin. Marine Geology 68, 243267.

F. Rossi , B. Gribsholt , J.J. Middelburg and C. Heip (2008) Context-dependent effects of suspension feeding on intertidal ecosystem functioning. Marine Ecology Progress Series 354, 4757.

M.F.L. Santos , P.C. Lana , J. Silva , J.G. Fachel and F.H. Pulgati (2009) Effects of non-aqueous fluids cuttings discharge from exploratory drilling activities on the deep-sea macrobenthic communities. Deep-Sea Research Part II: Topical Studies in Oceanography 56, 3240.

M.T. Schaanning , H.C. Trannum , S. Øxnevad , J. Carroll and T. Bakke (2008) Effects of drill cuttings on biogeochemical fluxes and macrobenthos of marine sediments. Journal of Experimental Marine Biology and Ecology 361, 4957.

C. Terzaghi , M. Buffagni , C. Cantelli , P. Bonfanti and M. Camatini (1998) Physical–chemical and ecotoxicological evaluation of water based drilling fluids used in Italian off-shore. Chemosphere 37, 28592871.

S.F. Thrush , J.E. Hewitt , V.J. Cummings and P.K. Dayton (1995) The impact of scallop dredging on marine benthic communities: what can be predicted from the results of experiments? Marine Ecology Progress Series 129, 141150.

M.H. Thurston , B.J. Bett , A.L. Rice and P.A.B. Jackson (1994) Variations in the invertebrate abyssal megafauna in the North Atlantic Ocean. Deep-Sea Research Part I: Oceanographic Research Papers 41, 13211348.

J.H. Tietjen (1992) Abundance and biomass of metazoan meiobenthos in the deep sea. In G.T. Rowe and V. Pariente (eds) Deep-sea food chains and the global carbon cycle. Dordrecht: Kluwer Academic, pp. 4562.

H.C. Trannum , H.C. Nilsson , M.T. Schaanning and S. Øxnevad (2010) Effects of sedimentation from water-based drill cuttings and natural sediment on benthic macrofaunal community structure and ecosystem processes. Journal of Experimental Marine Biology and Ecology 383, 111121.

M. Wlodarska-Kowalczuk , T.H. Pearson and M.A. Kendall (2005) Benthic response to chronic natural physical disturbance by glacial sedimentation in an Arctic fiord. Marine Ecology Progress Series 303, 3141.

D.R. Woods and J.H. Tietjen (1985) Horizontal and vertical distribution of meiofauna in the Venezuela Basin. Marine Geology 68, 233241.

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  • EISSN: 1469-7769
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Type Description Title
Supplementary Figure

Jones Supplementary Figure
Example pictures of megafauna found at Orca

 Unknown (5.5 MB)
5.5 MB