Sedimentology of a wreck: the Rainbow Warrior revisited |
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Authors: | Smith Abigail M Kregting Louise Fern Sophie Fraser Ceridwen I |
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Institution: | a Department of Marine Science, University of Otago, P.O. Box 56, Dunedin, New Zealand b Allan Wilson Centre for Molecular Ecology and Evolution, Department of Zoology, University of Otago, P.O. Box 56, Dunedin, New Zealand |
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Abstract: | The wreck of the Rainbow Warrior, a 40-m ship sunk on 12 December 1987 in Matauri Bay (34° 59′ S, 173° 56′ E), Cavalli Islands, northeastern New Zealand, offers an opportunity to investigate the impact of artificial substrate on temperate carbonate sedimentation. Surface sediment samples showed no significant textural or compositional difference between sediments near the wreck and those far from it. The large and diverse carbonate-producing community resident on the wreck (dominated by bryozoans, corals and sponges) has not had a measurable influence on adjacent bottom sediments (dominated by bivalves and barnacles), even after 21 years. It is likely that carbonate production on the Rainbow Warrior is insufficient to leave any sedimentary record over the potential lifetime of the wreck on the seafloor, which informs our understanding of the long-term impacts of shipwrecks (and other artificial substrata) on the local benthic environment in shallow temperate ecosystems. |
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Keywords: | Carbonate sediments Rainbow Warrior Biocoenosis Thanatocoenosis Temperate carbonates |
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