EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA
Ground level ultraviolet‐B (UV‐B; 290–320 nm) fluxes in Antarctica have been increasing due to stratospheric ozone depletion. Although mat‐forming cyanobacteria are major component of freshwater algal biomass in Antarctica, little is known about their response to increasing ultraviolet radiation (UV...
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crwiley:10.1046/j.1529-8817.1999.00001-193.x 2024-06-02T07:58:24+00:00 EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA Tang, E. P.Y. Neale, P.J Fritz, J.J. 2000 http://dx.doi.org/10.1046/j.1529-8817.1999.00001-193.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1529-8817.1999.00001-193.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1529-8817.1999.00001-193.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Phycology volume 36, issue s3, page 65-65 ISSN 0022-3646 1529-8817 journal-article 2000 crwiley https://doi.org/10.1046/j.1529-8817.1999.00001-193.x 2024-05-03T10:35:41Z Ground level ultraviolet‐B (UV‐B; 290–320 nm) fluxes in Antarctica have been increasing due to stratospheric ozone depletion. Although mat‐forming cyanobacteria are major component of freshwater algal biomass in Antarctica, little is known about their response to increasing ultraviolet radiation (UVR). The present study evaluated the sensitivity to UVR of two strains of mat‐forming cyanobacteria with different cell size, Phormidium murrayi (6.0 x 3.2 μm) and Schizothrix calcicola (2.2 x 2.3 μm). Cyanobacterial photosynthesis was measured under different UV spectral quality and quantity achieved by polychromatic filters with different cutoff wavelengths and neutral density screens. The productivity and irradiance data were used to generate biological weighting functions (BWF) for the assessment of UV inhibition on photosynthesis. The kinetics of UV inhibition, as determined by PAM fluorometry, differed between the two species so that inhibition of P. murrayi and S. calcicola were modeled based on UV‐irradiance and cumulative exposure, respectively. After a one hour exposure, BWF's did not differ between the two isolates of cyanobacteria despite their differences in cell size. To evaluate the negative impact of increased UV‐B exposure due to ozone depletion on cyanobacteria, the BWF's were applied to two solar spectra obtained from McMurdo Station, one on a day when the ozone hole was prominent (O 3 = 170 Dobson units; DU = 10‐3 cm O 3 ), and the other on a day with high ozone concentration (O 3 = 328 DU). The decrease in ozone level would reduce productivity by 3–8%. Seasonal variation of UVR has a bigger impact on cyanobacterial productivity than ozone depletion. Article in Journal/Newspaper Antarc* Antarctic Antarctica Wiley Online Library Antarctic McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) Journal of Phycology 36 s3 65 65 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Ground level ultraviolet‐B (UV‐B; 290–320 nm) fluxes in Antarctica have been increasing due to stratospheric ozone depletion. Although mat‐forming cyanobacteria are major component of freshwater algal biomass in Antarctica, little is known about their response to increasing ultraviolet radiation (UVR). The present study evaluated the sensitivity to UVR of two strains of mat‐forming cyanobacteria with different cell size, Phormidium murrayi (6.0 x 3.2 μm) and Schizothrix calcicola (2.2 x 2.3 μm). Cyanobacterial photosynthesis was measured under different UV spectral quality and quantity achieved by polychromatic filters with different cutoff wavelengths and neutral density screens. The productivity and irradiance data were used to generate biological weighting functions (BWF) for the assessment of UV inhibition on photosynthesis. The kinetics of UV inhibition, as determined by PAM fluorometry, differed between the two species so that inhibition of P. murrayi and S. calcicola were modeled based on UV‐irradiance and cumulative exposure, respectively. After a one hour exposure, BWF's did not differ between the two isolates of cyanobacteria despite their differences in cell size. To evaluate the negative impact of increased UV‐B exposure due to ozone depletion on cyanobacteria, the BWF's were applied to two solar spectra obtained from McMurdo Station, one on a day when the ozone hole was prominent (O 3 = 170 Dobson units; DU = 10‐3 cm O 3 ), and the other on a day with high ozone concentration (O 3 = 328 DU). The decrease in ozone level would reduce productivity by 3–8%. Seasonal variation of UVR has a bigger impact on cyanobacterial productivity than ozone depletion. |
format |
Article in Journal/Newspaper |
author |
Tang, E. P.Y. Neale, P.J Fritz, J.J. |
spellingShingle |
Tang, E. P.Y. Neale, P.J Fritz, J.J. EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA |
author_facet |
Tang, E. P.Y. Neale, P.J Fritz, J.J. |
author_sort |
Tang, E. P.Y. |
title |
EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA |
title_short |
EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA |
title_full |
EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA |
title_fullStr |
EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA |
title_full_unstemmed |
EFFECTS OF INCREASING UV‐B RADIATION DUE TO OZONE DEPLETION ON PHOTOSYNTHESIS OF ANTARCTIC CYANOBACTERIA |
title_sort |
effects of increasing uv‐b radiation due to ozone depletion on photosynthesis of antarctic cyanobacteria |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.1046/j.1529-8817.1999.00001-193.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1529-8817.1999.00001-193.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1529-8817.1999.00001-193.x |
long_lat |
ENVELOPE(166.667,166.667,-77.850,-77.850) |
geographic |
Antarctic McMurdo Station |
geographic_facet |
Antarctic McMurdo Station |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Journal of Phycology volume 36, issue s3, page 65-65 ISSN 0022-3646 1529-8817 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1529-8817.1999.00001-193.x |
container_title |
Journal of Phycology |
container_volume |
36 |
container_issue |
s3 |
container_start_page |
65 |
op_container_end_page |
65 |
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1800741729529233408 |