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Trading off safety against food: state dependent habitat choice and foraging in crucian carp

Publiceringsår: 1993
Språk: Engelska
Sidor: 353-357
Publikation/Tidskrift/Serie: Oecologia
Volym: 95
Nummer: 3
Dokumenttyp: Artikel
Förlag: Springer Berlin / Heidelberg

Sammanfattning

The influence of hunger level and predation
risk on habitat choice and foraging in crucian carp,
Carassius carassius, were studied in a laboratory experiment.
Experiments were carried out in aquaria with or
without a predator (pike, Esox lucius). Habitat use and
foraging activity of three-fish foraging groups of either
fed or hungry crucian carp were studied. Fish were allowed
to choose between an open (risky) habitat with Tubifex
worms and a habitat with dense vegetation (safe)
without food. Habitat use was significantly affected by
both risk of predation and hunger level. Crucian carp
spent less time in the open habitat when there was a
predator present and they also spent less time there when
fed than when hungry. Furthermore, there was a significant
interaction between risk of predation and hunger
level, indicating a state-dependent trade-off between food
acquisition and predator avoidance.

Disputation

Nyckelord

  • Biology and Life Sciences
  • Trade-off- Hunger - Predation - Foraging - Crucian carp

Övrigt

Published
Yes
  • ISSN: 0029-8549
  • ISSN: 1432-1939

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