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Lichens as ecological indicators in urban areas: beyond the effects of pollutants
Summary 1. In this work, we hypothesized that in urban areas with reduced pollution levels, local climatic conditions can be an important driver of lichen diversity. Thus, lichen functional groupsExpand
Antimony toxicity in the lichen Xanthoria parietina (L.) Th. Fr.
Treating the lichen Xanthoria parietina with Sb-containing solutions causes Sb bioaccumulation as well as physiological and ultrastructural changes such as plasmolysis, impairment of the thylakoid system of the alga and cytoplasmic lipid droplets, and damage to cell membranes. Expand
Bioacumulation and ultrastructural effects of Cd, Cu, Pb and Zn in the moss Scorpiurum circinatum (Brid.) Fleisch. & Loeske.
Despite the high heavy metal concentrations in treatment solutions, treated samples did not show severe ultrastructural changes and cells were still alive and generally well preserved, highlighting that moss cells survived to heavy metal toxicity by immobilizing most toxic ions extracellularly. Expand
Can ammonia tolerance amongst lichen functional groups be explained by physiological responses?
Both frequency and Fv/Fm of E. prunastri and X. parietina at ammonia-rich sites might be related to indirect effects of increased nitrogen (NH3) availability, highlighting the need to establish NH3 critical levels based on oligotrophic lichen species. Expand
Time- and dose-dependency of the effects of nitrogen pollution on lichens.
It was concluded that the response of lichens to N supply is not only species-specific, but also time- and dose-dependent, and given a clue on field studies on the relationships between lichens and N pollution. Expand
The integrity of lichen cell membrane as a suitable parameter for monitoring biological effects of acute nitrogen pollution.
It is suggested that the mycobiont is most affected in the case of N-excess, and that this feature can be used as suitable indicator of acute N stress episodes. Expand
Physiological effects of arsenic in the lichen Xanthoria parietina (L.) Th. Fr.
It was concluded that As exposure causes physiological stress both on the mycobiont and the photobionts and that cell membrane damage, expressed in terms of electric conductivity of rinsing water, is the parameter most affected by As treatment. Expand
Chlorophyll degradation and inhibition of polyamine biosynthesis in the lichen Xanthoria parietina under nitrogen stress.
The results showed that N excess does not cause chlorophyll degradation and suggested the absence of kinetics in the mode of action of the N compounds tested, suggesting that at leastchlorophyll integrity is not controlled by polyamines. Expand
Physiological effects of mercury in the lichens Cladonia arbuscula subsp. mitis (Sandst.) Ruoss and Peltigera rufescens (Weiss) Humb.
Differences between the two species were found, suggesting a differential sensitivity to Hg, as indicated by the increase in the concentration of products of lipid peroxidation and decrease in ergosterol content. Expand
Epiphytic lichens as indicators of environmental quality in Rome.
A synthesis of the studies on lichen diversity carried out in Rome over the period 1982-2003 is presented, with the lowest diversity now being found in the urban centre and in the eastern and southern sectors, while the "lichen desert" area has decreased in parallel with decreasing concentrations of CO, NO(x) and SO2. Expand