Phototaxis in Daphnia magna : the influence of temperature and acidity on the phototactic behaviour of Daphnia genotypes

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Abstract
The influence of culture temperature, temperature shocks and pH shocks on the phototactic behaviour of four Daphnia magna clones was studied. Test animals tended to become more positively phototactic when the pH of the medium was raised, and less positively phototactic when cultured at high (27°C) temperature. Responses to temperature changes at the start of the experiment were clone dependent. Differences between genotypes remained highly significant despite the broader environmental circumstances in which experiments were carried out. Broad heritability estimates for the phototactic behaviour of Daphnia under the different environmental conditions studied ranged from 0.78 to 0.88.

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