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Lethal Effects of Ultraviolet Radiation Under Different Concentrations of Dissolved Organic Carbon On Neobosmina Chilensis (Daday, 1902) (Cladocera, Bosminidae)

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The increase in the penetration of ultraviolet radiation that has been reported lately for freshwater ecosystems in southern South America, would allegedly generate alterations in ecological processes. In the present study, the mortality of Neobosmina chilensis (Daday 1902), a small cladoceran distributed in South American lakes and ponds, was studied in this respect. Specimens were reared in five different concentrations of dissolved organic carbon, and subjected to 24 hrs of exposure to artificial ultraviolet radiation. An inverse correlation between the dissolved organic carbon concentration and individual mortality was found. This result supports the description of a screen effect of dissolved organic carbon against ultraviolet radiation. The data obtained describe a linear relation, in which LC50 corresponded to 4.43 mg/l of dissolved organic carbon. The ecological implications of this result are discussed. El incremento de la penetración de la radiación ultravioleta ha sido reportado para ecosistemas lacustres en el sur de Sudamérica, y genera alteraciones en procesos ecológicos. En el presente trabajo, se estudió la mortalidad de Neobosmina chilensis (Daday, 1902), un cladócero de pequeño tamaño corporal distribuido en lagos y lagunas de América del Sur. Los especímenes fueron mantenidos por 24 horas bajo cinco concentraciones de carbono orgánico disuelto, y con exposición a radiación ultravioleta artificial. Se observó una relación inversa notoria entre la concentración de carbono orgánico disuelto y la mortalidad individual. Este resultado respalda la propuesta que el carbono orgánico disuelto genera un efecto protector contra la radiación ultravioleta. Los resultados describieron LC50 correspondió a 4.43 mg/l of carbono orgánico disuelto. Se discutieron las implicancias ecológicas de los resultados obtenidos.

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