Differential tolerance to ultraviolet-B light and photoenzymatic repair in cladocerans from a Chilean lake
Rodrigo Ramos-Jiliberto A B C , Patricia Dauelsberg B and Luis R. Zúñiga A
+ Author Affiliations
- Author Affiliations
A Instituto de Biología, Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile.
B Mathematical Ecology Group, Instituto de Matemáticas, Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile.
C Corresponding author. Email: rramos@ucv.cl
Marine and Freshwater Research 55(2) 193-200 https://doi.org/10.1071/MF03027
Submitted: 20 February 2003 Accepted: 15 October 2003 Published: 31 March 2004
Abstract
In the present study, the sensitivity of four coexisting cladoceran species to ultraviolet (UV)-B radiation was evaluated. First, the LD50 under conditions inhibiting the action of photoenzymatic repair was calculated by exposing cladocerans to different doses of UV-B light only. Animals in another treatment group were exposed to both UV-B and visible light, which allows for photoenzymatic repair. Photoenzymatic repair contributed significantly towards the degree of total tolerance to UV-B light in all groups of cladocerans, although the magnitude of the contribution varied among species. When no photoenzymatic repair was allowed, the most tolerant species was Moina micrura, followed by Daphnia ambigua and Ceriodaphnia dubia, with Diaphanosoma chilense being the most sensitive species. Under conditions permitting the action of photorepair, M. micrura was again the most tolerant species to UV-B light. Ceriodaphnia dubia showed an intermediate tolerance value, whereas D. chilense and D. ambigua were the least tolerant species, with no significant differences between them. Adults and juveniles of C. dubia differed in their sensitivity to UV-B light under conditions with and without photorepair.
Extra keywords: Chile, Daphnia, photoreactivation, toxicology, zooplankton.
Acknowledgments
We sincerely thank Ralph Tollrian and an anonymous reviewer for helpful comments. Our research was supported by Volkswagen-Stiftung funds and a German Academic Exchange Service (DAAD) scholarship to R.R.J. The experimental work was greatly facilitated by O. Siebeck and the staff of the Limnological Research Station of Seeon, of the Ludwig-Maximilians University of Munich. The manuscript was finished with partial support from FONDECYT grant 3000051 to R.R.J and Research project 124.789 from the Universidad Católica de Valparaíso.
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