Variations in mercury concentration within and across lichen Xanthoparmelia spp. individuals: implications for evaluating histories of contaminant loading and sampling design
Paul T. Gremillion A E , Edyth Hermosillo A D , Ken G. Sweat B and James V. Cizdziel C
+ Author Affiliations
- Author Affiliations
A Civil Engineering, Construction Management & Environmental Engineering Department, Northern Arizona University, 15600 S. McConnell Drive, Flagstaff, AZ 86011, USA.
B School of Mathematical and Natural Sciences, Arizona State University at the West Campus, Phoenix, AZ 85069, USA.
C Department of Chemistry & Biochemistry, 305 Coulter Hall, University of Mississippi, University, MS 38677, USA.
D Present address: United States Geological Survey, 2995 S. Pacific Avenue, Suite B, Yuma, AZ 85364, USA.
E Corresponding author. Email: paul.gremillion@nau.edu
Environmental Chemistry 10(5) 395-402 https://doi.org/10.1071/EN13053
Submitted: 2 March 2013 Accepted: 16 July 2013 Published: 30 August 2013
Environmental context. Lichens have been widely used as biomonitors of atmospheric pollution in the absence of high-density ambient monitoring networks. This study examines the potential for the lichen Xanthoparmelia spp. as a recorder of temporal histories of mercury deposition to the landscape.
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; 0.4–13.8 cm in diameter) indicated no significant relationship between Hg and size, although thalli less than 2 cm 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 2–8 cm in diameter, we observed Hg = 154 ± 30 ppb (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. ≈50 ppb Hg).
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