Seasonal Response of Daphnia pulex to Cyanobacterial Extracts at Different Temperatures in Valle de Bravo Reservoir (Mexico)

Valle de Bravo reservoir supplies drinking water to 40% of Mexico City. Here we present data on the population growth and life-table demography cladoceran Daphnia pulex, cultured at temperatures 20 °C 25 with different concentrations crude extracts from blooms Microcystis aeruginosa, collected in January, Woronichinia naegeliana, September. We hypothesized that pulex would be more sensitive higher temperature toxins W. naegeliana as these have been shown toxic rotifers. extracted conducted acute toxicity tests eight microcystins °C. The LC50 was 26.8 µg/L 11.5 µg/L, respectively, for samples. chronic included studies 5 10% concentration, Four replicates each three treatments, which consisted treatments low high cyanotoxin levels a control without cyanotoxins, were set up. rate ranged 0.18 0.42 d−1 M. aeruginosa (January) 0.2 0.31 naegeliana. Daphnia, being better adapted cooler temperatures, adversely affected than adverse effect cyanobacterial greater blooms. tolerance cyanotoxins depends bloom-forming species temperature.