Viscum album versus host (Sorbus aucuparia) as bioindicators of urban areas with various levels of pollution.

In this investigation we focus on the concentration of elements in Viscum album and its host (Sorbus aucuparia) as bioindicators of urban pollution. These broadly widespread species, very common in polluted areas may provide important information to monitor environmental quality throughout the year, especially for V. album. Cd, Co, Cr, Cu, Fe, Li, Mg, Mn, Ni, Pb and Zn concentrations were measured in the leaves and soil of the tree S. aucuparia as well as in V. album, a semi-parasite living on this tree species. The tree and the semi-parasite were studied in the urban environment of Oława (SW Poland). This area was selected because of the influence of a zinc smelter on the level of metal pollution of soil and plants and to compare the ability of S. aucuparia and V. album to accumulate metals. V. album appeared to be a better bioaccumulator of Cd, Ni, Pb and Zn and a weaker accumulator of Co than S. aucuparia in less polluted sites of Oława. S. aucuparia was a better bioaccumulator of Cd, Ni, Pb and Zn and a weaker accumulator of Co than V. album in more polluted sites. Cluster analysis of Cd, Co, Cr, Cu, Fe, Li, Mg, Mn, Ni, Pb and Zn concentrations in plants distinguished sites with lower and higher pollution levels which suggests a possibility of using these species for bioindication. However, the ratio of metals in V. album to S. aucuparia was different depending on the pollution level.