John Wiley & Sons, Ltd.

The effect of temperature on the sensitivity of Daphnia magna to cyanobacteria is genus dependent

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In this study we investigated the effects of six different genera of cyanobacteria on multiple endpoints of Daphnia magna in a 21‐day life‐table experiment conducted at three different temperatures (15°C, 19°C and 23°C). The specific aims were to test (1) if the effect of temperature on Daphnia's sensitivity to cyanobacteria was the same or different among different cyanobacteria and (2) if the rank order from the most to least harmful cyanobacteria to Daphnia reproduction would change or remain the same across the studied temperature range. Overall we observed a decrease in harmful effects on reproduction with increasing temperature for Microcystis, Nodularia and Aphanizomenon, and an increase in harmful effects with increasing temperature for Anabaena and Oscillatoria, while no effect of temperature on Daphnia sensitivity to Cylindrospermopsis was observed. Harmful effects of Microcystis and Nodularia on reproduction appear to be mirrored by a decrease in length. On the other hand, harmful effects of Anabaena, Aphanizomenon and Oscillatoria on reproduction were correlated with a decrease in intrinsic rate of natural increase (rm), which was matched by a later onset of reproduction in exposures to Oscillatoria. Additionally our results suggest that the rank order of harmfulness of the cyanobacteria may change with temperature. Higher temperatures may increase the sensitivity of Daphnia magna to the presence of some cyanobacteria (Anabaena and Oscillatoria) in their diet, while the harmful effects of others (Microcystis, Nodularia and Aphanizomenon) may become reduced by higher temperatures. Environ Toxicol Chem © 2014 SETAC

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