Evaluación ecotoxicológica de los efectos por la exposición de C02 en organismos acuáticos: caso de estudio Cypridopsis vidua
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2018-07-04
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Jaén: Universidad de Jaén
Resumen
[ES] La cantidad de C02 en la atmósfera a escala mundial alcanza las 400 ppm lo que significa, un aumento de 143%
desde el nivel preindustrial. De mantenerse las emisiones de C02 antropogénicas al ritmo actual se ocasionará una
caída de 0,3-0,4 unidades de pH en la superficie del océano para el año 2100. En este estudio se utilizó como modelo
experimental al ostrácodo Cypridopsis vidua. Se determinó la alimentación óptima utilizando microalga. Un primer
experimento de exposición aguda (96h) con valores de pH bajos (6,05) (6,55) (7,05) mostró un significativo descenso
en la supervivencia acumulada (>90%). En una segunda fase, se realizaron experiencias de exposición crónica (21d)
en las que inyectando C02 se mantuvieron dos tratamientos de pH (7,30) y (7,80). En este caso no alcanzaron altas
tasas de mortalidad pero si una disminución significativa en la tasa de reproducción y un efecto negativo sobre el
comportamiento fototáctico.
[EN] The amount of C02 in the atmosphere worldwide reaches 400 ppm, which mea ns an in crease of 143% from the preindustrial leve\. lf the anthropogenic C02 emissions are maintained at the current rate, a drop of 0.3-0.4 pH units will be generated in the ocean surface by the year 2100. In this study, Cypridopsis vidua ostracode was used as an experimental model. The optima! feeding was determined using microalgae. A first acute exposure experiment (96 h) with low pH values (6.05) {6.55) (7.05) showed a significant decrease in cumulative survival (> 90%). In a second phase, chronic exposure experiments (21d) were carried out in which, when C02 was injected, two treatments of pH (7.30) and (7.80) were maintained. In this case, they did not reach high mortality rates, but a significant decrease in the reproduction rate and a negative effect on the phototactic behavior.
[EN] The amount of C02 in the atmosphere worldwide reaches 400 ppm, which mea ns an in crease of 143% from the preindustrial leve\. lf the anthropogenic C02 emissions are maintained at the current rate, a drop of 0.3-0.4 pH units will be generated in the ocean surface by the year 2100. In this study, Cypridopsis vidua ostracode was used as an experimental model. The optima! feeding was determined using microalgae. A first acute exposure experiment (96 h) with low pH values (6.05) {6.55) (7.05) showed a significant decrease in cumulative survival (> 90%). In a second phase, chronic exposure experiments (21d) were carried out in which, when C02 was injected, two treatments of pH (7.30) and (7.80) were maintained. In this case, they did not reach high mortality rates, but a significant decrease in the reproduction rate and a negative effect on the phototactic behavior.