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Population Growth of Daphnia Pulex (Cladocera) on a Mixed Diet (Microcystis Aeruginosa with Chlorella or Scenedesmus)

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We quantified population growth of Daphnia pulex on diets of Microcystis aeruginosa mixed with Chlorella vulgaris or Scenedesmus acutus (0, 25, 50, 75, or 100% cyanobacteria with either algal species, based on equal biomass (dry weight)). We also evaluated the possible adaptations of D. pulex to cyanobacteria when previously grown on a mixture of M. aeruginosa and Chlorella or Scenedesmus. When offered alone, M. aeruginosa did not support the population growth of D. pulex for long, while the two algal species promoted population abundance of the daphniid. In terms of population growth, S. acutus was the better of the two algal species. When mixed with C. vulgaris or S. acutus, M. aeruginosa supported the population growth of Daphnia better than when offered alone. However, regardless of the proportion of the mixed diet, S. acutus with M. aeruginosa supported population growth in D. pulex better than did a mixture of Chlorella and Microcystis. The rate of population increase (r) per day obtained for D. pulex varied from 0.003 to 0.21, depending on the type of diet. When cultured on a mixed diet, regardless of the algal species involved, D. pulex showed decreased growth rates with an increasing proportion of Microcystis. D. pulex, previously reared on a mixed diet (M. aeruginosa with Chlorella or Scenedesmus in different proportions), did not grow when transferred to M. aeruginosa alone, and even began to decline starting directly from the beginning of the experiment. Our results suggest that, together with a species of green alga, the single-celled, toxic M. aeruginosa could be used for culturing D. pulex. Se cuantifico el crecimiento poblacional de Daphnia pulex bajo dietas de Microcystis aeruginosa con Chlorella vulgaris o Scenedesmus acutus (0, 25, 50, 75 y 100% de cianobacterias y/o alguna de las dos algas en igual contenido de biomasa (peso seco)). También se evaluó la posible adaptación de D. pulex (previamente aclimatada a la mezcla de M. aeruginosa y Chlorella o Scenedesmus) a la cianobacteria sola. Cuando se ofreció solo la dieta de M . aeruginosa esta no soporto por mucho tiempo el crecimiento poblacional de D. pulex, mientras las especies de algas verdes promovieron la abundancia poblacional del cladócero De las dos especies de algas S. acutus apoyo mejor el crecimiento poblacional del cladócero. Cuando se mezclo M. aeruginosa con C. vulgaris o S. acutus el crecimiento poblacional y abundancia de Daphnia fue mejor que utilizando solo M. aeruginosa. Sin embargo independientemente de la proporción de la mezcla de la dieta, S. acutus con M. aeruginosa promovió mejor crecimiento poblacional a comparación de la mezcla de Chlorella con Microcystis. La tasa de incremento poblacional (r) por día de D. pulex vario de 0,003 a 0,21 dependiendo del tipo de dieta y de su combinación. Cuando se cultivo en la dieta mixta, independientemente de la especie de alga, D. pulex mostró un decremento en su tasa de crecimiento cuando se incrementaba la proporción de Microcystis. D. pulex previamente aclimatada con la dieta de mezclas (M. aeruginosa con Chlorella o Scenedesmus a diferentes proporciones), cuando se cultivaron a una dieta de solo M. aeruginosa no crecieron y empezaron a declinar desde el inicio del experimento. Este resultado sugiere que con la mezcla de especies de alga verde, las células sencillas de M. aeruginosa toxica se pueden emplear para cultivar D. pulex.


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