Multiple‐Species Induction of Morphological Defenses in the Rotifer Keratella Testudo

@article{Stemberger1987MultipleSpeciesIO,
  title={Multiple‐Species Induction of Morphological Defenses in the Rotifer Keratella Testudo},
  author={Richard S. Stemberger and John J. Gilbert},
  journal={Ecology},
  year={1987},
  volume={68},
  pages={370-378}
}
Filtrates of cultures of 10 of 12 common freshwater zooplankton species induced posterior spines in the rotifer Keratella testudo. Filtrates of cultures of Asplanchna spp. and those of crustacean zooplankton, including cladocerans and cyclopoid and calanoid copepods, generally produced the strongest induction responses. The filtrates of Daphnia pulex cultures, at densities as low as 0.4 individuals/L, promoted significant posterior spine development. This is the first known case of a competitor… 
Predator-specific inducible defenses in the rotifer Keratella tropica
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The results support the idea that a major proportion of the phenotypic expression of K. tropica depends on the concentration of an inducing factor, which in turn depends upon the balance between release and decomposition rates of the chemical, and suggest an inverse relationship between spine length and growth rate.
INDUCIBLE DEFENSES IN MULTIPREDATOR ENVIRONMENTS: CYCLOMORPHOSIS IN DAPHNIA CUCULLATA.
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