Barium variation in Acropora palmata and Montastrea annularis

Nicholas E. Pingitore*, Yolanda Rangel, Andrew Kwarteng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


The barium contents of Acropora palmata and Montastrea annularis are distinct both in their averages (6 and 9 ppm, respectively) and, more impressively, in their variability (5 to 7 ppm and 6 to 15 ppm). A. palmata contained about 50% more Ba2+ than M. annularis and exhibited more than three times as much variation, as measured by their respective coefficients of variation. In contrast, the means and coefficients of variation of Sr2+ in these groups differed by only 6% and 15%. No obvious environmental or post-depositional causes for the inter-and intra-specific variation of Ba2+ could be found. Previous experiments indicate that the partitioning of Ba2+ into aragonite depends directly on the rate of precipitation. This suggests that Ba2+ does not substitute for Ca2+ but instead is incorporated by occlusion. Since growth rates in A. palmata often exceed those of M. annularis, this appears to be the mechanism which generates higher and more variable concentrations of Ba2+ in A. palmata.

Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalCoral Reefs
Issue number1
Publication statusPublished - Jun 1989
Externally publishedYes

ASJC Scopus subject areas

  • Aquatic Science


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