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Ponds containing the parthenogenetic zooplankter Daphnia pulex with and without chaoborid predators were sampled over the course of a season. A significant (P < 0.05) Spearman rank correlation was found between predator density and the expression of an antipredator defense (neckteeth) by the Daphnia. The reaction norms (percent induction of a single(More)
Predatory larvae of the midge Chaoborus americanus induce an antipredator defense (‘neckteeth’) in prey individuals of the cladoceran Daphnia pulex. The signal for presence of predator is a water-soluble chemical. We provide evidence that this kairomone originates in the intestinal tract of the predator. The active compound is an organic molecule of(More)
Daphnia pulex (Crustacea: Cladocera) embryos were found to be sensitive to a chemical cue (kairomone) in an extract of the predator Chaoborus americanus (Insecta:Diptera). Sensitivity of embryos to the kairomone remains throughout embryonic development. Apparently declining sensitivity as development proceeds may be due to the amount of time the embryos are(More)
In a recent letter to this journal, Clive G. Jones (1988) suggests that the mix of articles in the Journal of Chemical Ecology is weighted too heavily toward chemistry and not enough toward ecology. He suggests the society consider rewriting its statement of purpose to more explicitly emphasize the ecological significance of the chemical interactions(More)
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