Effects of UV-B irradiation on a marine microecosystem

Photochemistry and Photobiology
Roberto MarangoniGiuliano Colombetti

Abstract

Purpose of this work was to study the effect of UV irradiation on a microecosystem consisting of several interacting species. The system chosen was of a hypersaline type, where all the species present live at high salt concentration; it comprises different bacteria; a producer, the photosynthetic green alga Dunaliella salina; and a consumer, the ciliated protozoan Fabrea salina, which form a complete food chain. We were able to establish the initial conditions that give rise to a self-sustaining microecosystem, stable for at least 3 weeks. We then determined the effect of UV irradiation on this microecosystem under laboratory-controlled conditions, in particular by measuring the critical UV exposure for the two main components of the microecosystem (algae and protozoa) under UV-B irradiances comparable to those of solar irradiation. In our experiments, we varied irradiance, total dose and spectral composition of the actinic light. The critical doses at irradiances of the order of 56 kJ/m(2) (typical average daily irradiance in a sunny summer day in Pisa), measured for each main component of the microecosystem (algae and ciliates), turned out to be around 70 kJ/m(2) for ciliates and 50 kJ/m(2) for D. salina. By exposing microeco...Continue Reading

References

Jan 1, 1989·Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life·J F KastingA T Young
May 1, 1989·Photochemistry and Photobiology·A DahlbackK Stamnes
Apr 1, 1968·Journal of Bacteriology·M K JohnsonB S Bruff
Feb 18, 1997·Proceedings of the National Academy of Sciences of the United States of America·K D MalloyH W Detrich
Jan 23, 1999·Journal of Photochemistry and Photobiology. B, Biology·S MadronichM M Caldwell
Jun 3, 2000·Journal of Photochemistry and Photobiology. B, Biology·T DoukiJ Cadet
Mar 10, 2001·Journal of Photochemistry and Photobiology. B, Biology·R MarangoniD P Häder
Sep 7, 2001·The Journal of Eukaryotic Microbiology·L J Rothschild
Nov 6, 2001·Journal of Photochemistry and Photobiology. B, Biology·R Sommaruga
Feb 19, 2002·Journal of Photochemistry and Photobiology. B, Biology·Michael LebertDonat Peter Häder
Sep 1, 1990·Journal of Morphology·Arthur J Repak, O Roger Anderson

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Citations

Nov 19, 2011·European Biophysics Journal : EBJ·Roberto MarangoniAndrea Motta
Jan 12, 2008·Comptes rendus biologies·Wassim GuermaziLotfi Aleya

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Methods Mentioned

BETA
environmental stresses

Software Mentioned

ELDONET

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