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MA8 Ecotoxicology of Tropical Aquatic Environments
() Phototoxicity of PAHs and environmental samples on Caribbean aquatic organisms and Artemia franciscana.
Ramírez-Romero, P.1, Guzmán-Martínez, M. C.1, 1 Universidad Autónoma Metropolitana Iztapalapa, México, D. F., México
ABSTRACT- It is known that PAHs phototoxicity increases in the presence of UV radiation however, the ecological relevance of this phenomenon has been discussed lately. Some tropical regions like the Caribbean present characteristics like very clear waters, high sun radiation, and touristic activities in which fossil fuels are burned, that may represent an ecological risk if the organisms that inhabit this region are sensitive to phototoxicity. The objective of the present study was to evaluate the toxicity of environmental samples containing PAHs and of fluoranthene and anthracene on Artemia franciscana, as a surrogate species, and on organisms present in the Mexican Caribbean. Water samples from marinas and scuba-dive areas were taken as well as UV radiation, salinity and temperature measurements. 48 hours static bioassays with water renewal were performed in a field laboratory where Artemia or planktonic organisms were exposed to the field samples and to PAHs with or without a UV screen. Water temperature was maintained at 30 degrees and sun light was used as the source of UV radiation, after two hours of dark incubation. Copepods, jelly fish, sea anemone, fish larvae and crustacean larvae were sensitive to ppb levels of PAHs and to some of the field samples. The more colored animals were the less sensible to PAHs. In general Artemia franciscana was less sensitive to phototoxicity than the organisms present in the environment. In conclusion, those areas with more anthropogenic influence may present high enough concentrations of PAHs to cause the mortality of some plankton organisms in the Caribbean.
Key words: Caribbean, phototoxicity, Tropical ecotoxicology, PAHs
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