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Generalization of learned predator recognition: an experimental test and framework for future studies.

Maud C O Ferrari1, Adega Gonzalo, François Messier

  • 1Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2. maud.ferrari@usask.ca

Proceedings. Biological Sciences
|May 24, 2007
PubMed
Summary

Prey fish can learn to recognize predators and generalize this learning to related species. Fathead minnows learned to identify lake trout and extended this recognition to similar trout species, showing predator recognition generalization.

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Area of Science:

  • Behavioral Ecology
  • Chemical Ecology
  • Animal Behavior

Background:

  • Prey species vary in their ability to recognize predators, with some relying on innate recognition and others on learned responses.
  • The characteristics of predators that prey learn to recognize and the extent of generalization to similar threats remain largely unexplored.

Purpose of the Study:

  • To investigate if fathead minnows, after learning to recognize a specific predator's chemical cues, can generalize this learned recognition to closely related predator species.
  • To determine if the degree of generalization correlates with the phylogenetic relatedness between predator species.

Main Methods:

  • Fathead minnows were trained to recognize the chemical odor of a reference predator (lake trout).
  • Antipredator responses were measured when exposed to odors of related trout species (brook trout, rainbow trout), a distantly related predator (pike), and a non-predatory fish (sucker).

Main Results:

  • Minnows generalized predator recognition from lake trout to brook trout (same genus) and rainbow trout (same family).
  • Generalization did not occur with pike (distantly related predator) or suckers (non-predator).
  • The intensity of antipredator responses was positively correlated with the phylogenetic closeness to the reference predator.

Conclusions:

  • This study provides the first evidence that prey can generalize learned predator recognition to related species.
  • The findings suggest that prey antipredator learning is influenced by predator phylogeny, with responses intensifying for more closely related threats.
  • A theoretical framework for understanding the generalization of predator recognition is proposed.