Radiocarbon Based Ages and Growth Rates: Hawaiian Deep Sea Corals

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The radial growth rates and ages of three 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 at the Makapuu deep-sea coral bed using a submersible (PISCES V). Specimens of Antipathes dichotoma were collected at 50 m off Lahaina, Maui. The primary source of carbon to the calcitic C. secundum skeleton is in situ dissolved inorganic carbon (DIC). Using bomb {sup 14}C time markers we calculate radial growth rates of {approx} 170 {micro}m y{sup -1} and ages of 68-75 years on specimens ... continued below

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Roark, E B; Guilderson, T P; Dunbar, R B & Ingram, B L January 13, 2006.

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The radial growth rates and ages of three 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 at the Makapuu deep-sea coral bed using a submersible (PISCES V). Specimens of Antipathes dichotoma were collected at 50 m off Lahaina, Maui. The primary source of carbon to the calcitic C. secundum skeleton is in situ dissolved inorganic carbon (DIC). Using bomb {sup 14}C time markers we calculate radial growth rates of {approx} 170 {micro}m y{sup -1} and ages of 68-75 years on specimens as tall as 28 cm of C. secundum. Gerardia sp., A. dichotoma, and L. glaberrima have proteinaceous skeletons and labile particulate organic carbon (POC) is their primary source of architectural carbon. Using {sup 14}C we calculate a radial growth rate of 15 {micro}m y{sup -1} and an age of 807 {+-} 30 years for a live collected Gerardia sp., showing that these organisms are extremely long lived. Inner and outer {sup 14}C measurements on four sub-fossil Gerardia spp. samples produce similar growth rate estimates (range 14-45 {micro}m y{sup -1}) and ages (range 450-2742 years) as observed for the live collected sample. Similarly, with a growth rate of < 10 {micro}m y{sup -1} and an age of {approx}2377 years, L. glaberrima at the Makapuu coral bed, is also extremely long lived. In contrast, the shallow-collected A. dichotoma samples yield growth rates ranging from 130 to 1,140 {micro}m y{sup -1}. These results show that Hawaiian deep-sea corals grow more slowly and are older than previously thought.

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PDF-file: 39 pages; size: 1.1 Mbytes

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  • Journal Name: Marine Ecology Progress Series, vol. 327, N/A, December 7, 2006, pp. 1-14; Journal Volume: 327

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  • Report No.: UCRL-JRNL-218201
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936491
  • Archival Resource Key: ark:/67531/metadc893496

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  • January 13, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 6, 2016, 6:13 p.m.

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Roark, E B; Guilderson, T P; Dunbar, R B & Ingram, B L. Radiocarbon Based Ages and Growth Rates: Hawaiian Deep Sea Corals, article, January 13, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc893496/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.