Cargando…
Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1
We tested whether mixotrophic ciliates are more resistant to solar ultraviolet radiation (UVR) than heterotrophic ones because symbiotic algae can provide self-shading by cell matter absorption and eventually by direct UV screening from mycosporine-like amino acids (MAAs). Sensitivity of a natural a...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Blackwell Publishing Inc
2011
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3182536/ https://www.ncbi.nlm.nih.gov/pubmed/21414057 http://dx.doi.org/10.1111/j.1550-7408.2011.00540.x |
_version_ | 1782212920360304640 |
---|---|
author | SONNTAG, BETTINA SUMMERER, MONIKA SOMMARUGA, RUBEN |
author_facet | SONNTAG, BETTINA SUMMERER, MONIKA SOMMARUGA, RUBEN |
author_sort | SONNTAG, BETTINA |
collection | PubMed |
description | We tested whether mixotrophic ciliates are more resistant to solar ultraviolet radiation (UVR) than heterotrophic ones because symbiotic algae can provide self-shading by cell matter absorption and eventually by direct UV screening from mycosporine-like amino acids (MAAs). Sensitivity of a natural assemblage to solar radiation was tested in experiments in the original lake and in a more UV transparent alpine lake after transplantation of the ciliates. In both lakes, the assemblage was exposed either to full sunlight, to photosynthetically active radiation only, or kept in the dark. In each lake, exposure was for 5 h at the surface and at the depth corresponding to the 10% attenuation depth at 320 nm. Overall, when the assemblage was exposed to surface UVR, only one out of four dominant mixotrophic ciliates, Vorticella chlorellata, was more resistant than heterotrophic species. The higher UV resistance in V. chlorellata was related to the presence of MAAs and the high percentage of ciliate volume occupied by algal symbionts. Our results indicate that effects of UVR were species-specific and depended on efficient screening of these wavelengths, but also on the depth preference of the ciliates and thus, on their previous exposure history to UVR. |
format | Online Article Text |
id | pubmed-3182536 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Blackwell Publishing Inc |
record_format | MEDLINE/PubMed |
spelling | pubmed-31825362011-09-29 Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1 SONNTAG, BETTINA SUMMERER, MONIKA SOMMARUGA, RUBEN J Eukaryot Microbiol Symposium: Alternative Nutritional Strategies in Protists We tested whether mixotrophic ciliates are more resistant to solar ultraviolet radiation (UVR) than heterotrophic ones because symbiotic algae can provide self-shading by cell matter absorption and eventually by direct UV screening from mycosporine-like amino acids (MAAs). Sensitivity of a natural assemblage to solar radiation was tested in experiments in the original lake and in a more UV transparent alpine lake after transplantation of the ciliates. In both lakes, the assemblage was exposed either to full sunlight, to photosynthetically active radiation only, or kept in the dark. In each lake, exposure was for 5 h at the surface and at the depth corresponding to the 10% attenuation depth at 320 nm. Overall, when the assemblage was exposed to surface UVR, only one out of four dominant mixotrophic ciliates, Vorticella chlorellata, was more resistant than heterotrophic species. The higher UV resistance in V. chlorellata was related to the presence of MAAs and the high percentage of ciliate volume occupied by algal symbionts. Our results indicate that effects of UVR were species-specific and depended on efficient screening of these wavelengths, but also on the depth preference of the ciliates and thus, on their previous exposure history to UVR. Blackwell Publishing Inc 2011-05 /pmc/articles/PMC3182536/ /pubmed/21414057 http://dx.doi.org/10.1111/j.1550-7408.2011.00540.x Text en 2011 The Author(s). Journal of Eukaryotic Microbiology © 2011 International Society of Protistologists http://creativecommons.org/licenses/by/2.5/ Re-use of this article is permitted in accordance with the Terms and Conditions set out at http://wileyonlinelibrary.com/onlineopen#OnlineOpen_Terms. |
spellingShingle | Symposium: Alternative Nutritional Strategies in Protists SONNTAG, BETTINA SUMMERER, MONIKA SOMMARUGA, RUBEN Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1 |
title | Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1 |
title_full | Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1 |
title_fullStr | Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1 |
title_full_unstemmed | Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1 |
title_short | Are Freshwater Mixotrophic Ciliates Less Sensitive to Solar Ultraviolet Radiation than Heterotrophic Ones?1 |
title_sort | are freshwater mixotrophic ciliates less sensitive to solar ultraviolet radiation than heterotrophic ones?1 |
topic | Symposium: Alternative Nutritional Strategies in Protists |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3182536/ https://www.ncbi.nlm.nih.gov/pubmed/21414057 http://dx.doi.org/10.1111/j.1550-7408.2011.00540.x |
work_keys_str_mv | AT sonntagbettina arefreshwatermixotrophicciliateslesssensitivetosolarultravioletradiationthanheterotrophicones1 AT summerermonika arefreshwatermixotrophicciliateslesssensitivetosolarultravioletradiationthanheterotrophicones1 AT sommarugaruben arefreshwatermixotrophicciliateslesssensitivetosolarultravioletradiationthanheterotrophicones1 |