Growth rate determinations from radiocarbon in bamboo corals (genus Keratoisis)

Jesse R. Farmer*, Laura F. Robinson, Bärbel Hönisch

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

9 Citations (Scopus)

Abstract

Radiocarbon (<sup>14</sup>C) measurements are an important tool for determining growth rates of bamboo corals, a cosmopolitan group of calcitic deep-sea corals. Published growth rate estimates for bamboo corals are highly variable, with potential environmental or ecological drivers of this variability poorly constrained. Here we systematically investigate the application of <sup>14</sup>C for growth rate determinations in bamboo corals using 55 <sup>14</sup>C dates on the calcite and organic fractions of six bamboo corals (identified as Keratoisis sp.) from the western North Atlantic Ocean. Calcite <sup>14</sup>C measurements on the distal surface of these corals and five previously published bamboo corals exhibit a strong one-to-one relationship with the <sup>14</sup>C of dissolved inorganic carbon (DI<sup>14</sup>C) in ambient seawater (r<sup>2</sup>=0.98), confirming the use of Keratoisis sp. calcite <sup>14</sup>C as a proxy for seawater <sup>14</sup>C activity. Radial growth rates determined from <sup>14</sup>C age-depth regressions, <sup>14</sup>C plateau tuning and bomb <sup>14</sup>C reference chronologies range from 12 to 78μmy<sup>-1</sup>, in general agreement with previously published radiometric growth rates. We document potential biases to <sup>14</sup>C growth rate determinations resulting from water mass variability, bomb radiocarbon, secondary infilling (ontogeny), and growth rate nonlinearity. Radial growth rates for Keratoisis sp. specimens do not correlate with ambient temperature, suggesting that additional biological and/or environmental factors may influence bamboo coral growth rates.

Original languageEnglish
Article number2519
Pages (from-to)26-40
Number of pages15
JournalDeep-Sea Research Part I: Oceanographic Research Papers
Volume105
DOIs
Publication statusPublished - 1 Aug 2015

Keywords

  • Bamboo coral
  • Deep-sea coral
  • Growth rates
  • Radiocarbon

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