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• W2077543784 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 327:1-14 (2006) - doi:10.3354/meps327001 Radiocarbon-based ages and growth rates of Hawaiian deep-sea corals E. Brendan Roark1,4,*, Thomas P. Guilderson2,3, Robert B. Dunbar4, B. Lynn Ingram1,5 1Department of Geography, University of California, Berkeley, California 94720-4740, USA 2Center for Accelerator Mass Spectrometry, LLNL, L-397 7000 East Avenue, Livermore, California 94551, USA 3Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA 4Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, USA 5Department of Earth and Planetary Science, University of California, Berkeley, California 94720-4767, USA *Email: broark@stanford.edu Present address: Stanford University ABSTRACT: The radial growth rates and ages of 3 different groups of Hawaiian deep-sea ‘corals’ were determined using radiocarbon measurements. Specimens of Corallium secundum, Gerardia sp., and Leiopathes glaberrima were collected from 450 ± 40 m depth at the Makapuu deep-sea coral bed off the southeast coast of Oahu, Hawaii, USA, using a submersible vessel (PISCES V). Specimens of Antipathes dichotoma were collected at 50 m depth off Lahaina, Maui, Hawaii. The primary source of carbon to the calcitic C. secundum skeleton is in situ dissolved inorganic carbon (DIC). Using ‘bomb 14C’ time markers we calculated radial growth rates of ~170 µm yr–1 and ages of 67 to 71 yr for specimens of C. secundum up to 28 cm tall. Gerardia sp., A. dichotoma, and L. glaberrima have proteinaceous skeletons, and labile particulate organic carbon (POC) is their primary source of architectural carbon. Using 14C we calculated a radial growth rate of 15 µm yr–1 and an age of 807 ± 30 yr for a live collected Gerardia sp., showing that these organisms are extremely long lived. Radiocarbon measurements taken from the inner and outer portions of basal cross sections of 4 sub-fossil Gerardia sp. samples showed growth rates (range 14 to 45 µm yr–1) and ages (range 450 to 2742 yr) similar to that of the live collected sample. Similarly, with a growth rate of <10 µm yr–1 and an age of ~2377 yr, L. glaberrima at the Makapuu coral bed is also extremely long lived. In contrast, the shallow-collected A. dichotoma samples yielded growth rates ranging from 130 to 1140 µm yr–1 (12 to 32 yr). These results show that Hawaiian deep-sea corals grow more slowly and are older than previously thought. KEY WORDS: Deep-sea coral . Age · Growth rate . Radiocarbon . Corallium secundum . Gerardia sp. . Leiopathes glaberrima . Antipathes dichotoma Full text in pdf format Supplementary appendix NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 327. Online publication date: December 07, 2006 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2006 Inter-Research." @default.
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• W2077543784 title "Radiocarbon-based ages and growth rates of Hawaiian deep-sea corals" @default.
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