Abstract
Abstract. The effects of predator-conditioned water on two Daphnia behaviour patterns, vertical migration and polarotactic orientation in the horizontal plane, were tested using several clones of both D. longispina and D. magna. The smaller D. longispina showed statistically significant reductions in polarotactic orientation in invertebrate-conditioned water, while the larger D. magna responded only to fish-conditioned water with changes in vertical migration behaviour. The extent of the behavioural reaction to predator chemical cues is related to the level of predatory pressure in the ponds from which the clones came: the more predator species in a pond, the more likely a clone was to be responsive to chemical cues.
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