title: Inducible defences in Daphnia: responses to two closely related predator species.
abstract: The predator-induced responses of two species of Australian Daphnia, with contrasting distributions and life history patterns, to the kairomones of two species of Anisops predators, were measured. Daphnia longicephala produced a large crest and attained a larger size when exposed to both predators. D. carinata sl matured earlier than D. longicephala and did not produce a crest. Surprisingly, kairomones of both predators inhibited the production of ephippia in D. carinata sl. Anisops stali, the larger of the two predator species, induced a significantly larger crest size in D. longicephala, and larger brood size in both species compared with the smaller A. gratus, indicating a quantitative but not qualitative effect of predator species on inducible defences.
authors.affiliation: School of Life Sciences and Technology, Victoria University, St Albans Campus, GPO Box 14428, MCMC, Melbourne 8001, Australia e-mail: michael.barry@vu.edu.au; Fax +61-3-93652465, , , , , , AU.
authors.forename: M J
authors.initials: MJ
authors.lastname: Barry
keywords: Chemical communication; Crest induction; Ephippia; Kairomone; Key words  Anisops