Variations in mercury concentration within and across lichen Xanthoparmelia spp. individuals: Implications for evaluating histories of contaminant loading and sampling design

Paul T. Gremillion, Edyth Hermosillo, Ken Sweat, James V. Cizdziel

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    Abstract

    Effects of thallus size and internal zonation on the Hg concentration in the foliose lichen Xanthoparmelia spp. were investigated. Size and zonation effects, if present, provide the potential for temporal records of atmospheric deposition to be recorded in lichens. Our results (n = 49; 0.4-13.8cm in diameter) indicated no significant relationship between Hg and size, although thalli less than 2cm in diameter tended towards lower Hg concentrations; and no zonation of Hg within thalli. Distinct zonation of Hg in thalli has been reported in some studies, but not in others, indicating regulatory mechanisms result by which Hg is released or relocated within the thallus under certain conditions. A secondary objective was to evaluate the variability of Hg in lichen individuals to drive future sampling designs. Within a size range of 2-8cm in diameter, we observed Hg = 154 ± 30ppb (mean ± s.d., n = 38). Bootstrap analysis of this dataset indicated that for a sample size of n = 3 thalli, we can expect a 94% probability that the variability in our sample set will be at least as low as that observed in other studies of Hg in lichen (s.d. ≈50ppb Hg).

    Original languageEnglish (US)
    Pages (from-to)395-402
    Number of pages8
    JournalEnvironmental Chemistry
    Volume10
    Issue number5
    DOIs
    StatePublished - Nov 8 2013

    Fingerprint

    Mercury
    lichen
    zonation
    Impurities
    Sampling
    pollutant
    sampling
    history
    temporal record
    atmospheric deposition
    range size
    mercury
    Lichens
    effect

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Chemistry (miscellaneous)
    • Environmental Chemistry

    Cite this

    Variations in mercury concentration within and across lichen Xanthoparmelia spp. individuals : Implications for evaluating histories of contaminant loading and sampling design. / Gremillion, Paul T.; Hermosillo, Edyth; Sweat, Ken; Cizdziel, James V.

    In: Environmental Chemistry, Vol. 10, No. 5, 08.11.2013, p. 395-402.

    Research output: Contribution to journalArticle

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