Abstract
Physiologically active thalli of the lichen Evernia mesomorpha Nyl. were very sensitive to short-term fumigations with low concentrations of gaseous sulfur dioxide. Net CO/sub 2/ assimilation rate (NAR) was significantly reduced after exposure to 0.085 ..mu..l l/sup -1/ (250 ..mu..g m/sup -3/) SO/sub 2/ for 1 h or more, and the reduction increased with increasing concentration. Duration of exposure had no significant effect on NAR, indicating the importance of rate of SO/sub 2/ uptake rather than the total amount absorbed. Respiration was significantly reduced after 4 h or more of exposure to 0.265 ..mu..l l/sup -1/ (639 ..mu..g m/sup -3/) SO/sub 2/ or higher. Recovery of NAR after fumigation was dependent on both SO/sub 2/ concentration and duration of fumigation, and on the time allowed for recovery. Virtually complete recovery occurred within 24 h after episodes with up to 0.355 ..mu..l l/sup -1/ (856 ..mu..g m/sup -3/) SO/sub 2/ for 1 h and 0.085 ..mu..l l/sup -1/ SO/sub 2/ for 4 h. Above these levels, recovery was incomplete or nonexistent after 24 h in clean air. The level of sensitivity found can be attributed to the environmental conditions during fumigation, which prevented thallus desiccation and inactivity. Based on this study,
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Citation Formats
Huebert, D B, L'Hirondelle, S J, and Addison, P A.
Effects of sulfur dioxide on net CO/sub 2/ assimilation in the lichen Evernia mesomorpha Nyl.
United Kingdom: N. p.,
1985.
Web.
doi:10.1111/j.1469-8137.1985.tb02809.x.
Huebert, D B, L'Hirondelle, S J, & Addison, P A.
Effects of sulfur dioxide on net CO/sub 2/ assimilation in the lichen Evernia mesomorpha Nyl.
United Kingdom.
https://doi.org/10.1111/j.1469-8137.1985.tb02809.x
Huebert, D B, L'Hirondelle, S J, and Addison, P A.
1985.
"Effects of sulfur dioxide on net CO/sub 2/ assimilation in the lichen Evernia mesomorpha Nyl."
United Kingdom.
https://doi.org/10.1111/j.1469-8137.1985.tb02809.x.
@misc{etde_7117827,
title = {Effects of sulfur dioxide on net CO/sub 2/ assimilation in the lichen Evernia mesomorpha Nyl}
author = {Huebert, D B, L'Hirondelle, S J, and Addison, P A}
abstractNote = {Physiologically active thalli of the lichen Evernia mesomorpha Nyl. were very sensitive to short-term fumigations with low concentrations of gaseous sulfur dioxide. Net CO/sub 2/ assimilation rate (NAR) was significantly reduced after exposure to 0.085 ..mu..l l/sup -1/ (250 ..mu..g m/sup -3/) SO/sub 2/ for 1 h or more, and the reduction increased with increasing concentration. Duration of exposure had no significant effect on NAR, indicating the importance of rate of SO/sub 2/ uptake rather than the total amount absorbed. Respiration was significantly reduced after 4 h or more of exposure to 0.265 ..mu..l l/sup -1/ (639 ..mu..g m/sup -3/) SO/sub 2/ or higher. Recovery of NAR after fumigation was dependent on both SO/sub 2/ concentration and duration of fumigation, and on the time allowed for recovery. Virtually complete recovery occurred within 24 h after episodes with up to 0.355 ..mu..l l/sup -1/ (856 ..mu..g m/sup -3/) SO/sub 2/ for 1 h and 0.085 ..mu..l l/sup -1/ SO/sub 2/ for 4 h. Above these levels, recovery was incomplete or nonexistent after 24 h in clean air. The level of sensitivity found can be attributed to the environmental conditions during fumigation, which prevented thallus desiccation and inactivity. Based on this study, neither the concept of dose (concentration x time) nor that of threshold levels of SO/sub 2/ fumigations are supported. Peak exposures to SO/sub 2/ for short periods may be of primary importance in determining the survival of lichens in industrial areas.}
doi = {10.1111/j.1469-8137.1985.tb02809.x}
journal = []
volume = {100}
journal type = {AC}
place = {United Kingdom}
year = {1985}
month = {Jan}
}
title = {Effects of sulfur dioxide on net CO/sub 2/ assimilation in the lichen Evernia mesomorpha Nyl}
author = {Huebert, D B, L'Hirondelle, S J, and Addison, P A}
abstractNote = {Physiologically active thalli of the lichen Evernia mesomorpha Nyl. were very sensitive to short-term fumigations with low concentrations of gaseous sulfur dioxide. Net CO/sub 2/ assimilation rate (NAR) was significantly reduced after exposure to 0.085 ..mu..l l/sup -1/ (250 ..mu..g m/sup -3/) SO/sub 2/ for 1 h or more, and the reduction increased with increasing concentration. Duration of exposure had no significant effect on NAR, indicating the importance of rate of SO/sub 2/ uptake rather than the total amount absorbed. Respiration was significantly reduced after 4 h or more of exposure to 0.265 ..mu..l l/sup -1/ (639 ..mu..g m/sup -3/) SO/sub 2/ or higher. Recovery of NAR after fumigation was dependent on both SO/sub 2/ concentration and duration of fumigation, and on the time allowed for recovery. Virtually complete recovery occurred within 24 h after episodes with up to 0.355 ..mu..l l/sup -1/ (856 ..mu..g m/sup -3/) SO/sub 2/ for 1 h and 0.085 ..mu..l l/sup -1/ SO/sub 2/ for 4 h. Above these levels, recovery was incomplete or nonexistent after 24 h in clean air. The level of sensitivity found can be attributed to the environmental conditions during fumigation, which prevented thallus desiccation and inactivity. Based on this study, neither the concept of dose (concentration x time) nor that of threshold levels of SO/sub 2/ fumigations are supported. Peak exposures to SO/sub 2/ for short periods may be of primary importance in determining the survival of lichens in industrial areas.}
doi = {10.1111/j.1469-8137.1985.tb02809.x}
journal = []
volume = {100}
journal type = {AC}
place = {United Kingdom}
year = {1985}
month = {Jan}
}