Biometric assessment of deep-sea vent megabenthic communities using multi-resolution 3D image reconstructions

TitleBiometric assessment of deep-sea vent megabenthic communities using multi-resolution 3D image reconstructions
Publication TypeJournal Article
Year of Publication2016
AuthorsThornton B., Bodenmann A., Pizarro O., Williams S.B, Friedman A., Nakajima R., Takai K., Motoki K., Watsuji T., Hirayama H., Matsui Y., Watanabe H., Ura T.
JournalDeep-Sea Research Part I-Oceanographic Research Papers
Volume116
Pagination200-219
Date Published2016/10
Type of ArticleArticle
ISBN Number0967-0637
Accession NumberWOS:000385326700018
Keywords3D reconstruction; east pacific rise; Ecological mapping; galapagos; hydrothermal vents; lau spreading center; mapping system; mid-atlantic ridge; ocean crust; okinawa trough; ridge; rift; sulfide edifices; Underwater vehicle; valu fa; Vent-ecology; visual survey
Abstract

This paper describes a method to survey the distribution of megabenthos over multi-hectare regions of the seafloor. Quantitative biomass estimates are made by combining high-resolution 3D image reconstructions, used to model spatial relationships between representative taxa, with lower-resolution reconstructions taken over a wider area in which the distribution of larger predatory animals can be observed. The method is applied to a region of the Iheya North field that was the target of scientific drilling during the IODP Expedition 331 in 2010. An area of 2.5 ha was surveyed 3 years and 4 months after the site was drilled. More than 100,000 organisms from 6 taxa were identified. The visible effects of drilling on the distribution of megabenthos were confined to a 20 m radius of the artificially created hydrothermal discharges, with the associated densities of biomass lower than observed in nearby naturally discharging areas. (C) 2016 The Authors. Published by Elsevier Ltd.

DOI10.1016/j.dsr.2016.08.009
Student Publication: 
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