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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary ecology     Display Documents

ID: 250923.0, MPI für Evolutionsbiologie / Evolutionary ecology
Sticklebacks benefit from closer predator inspection: an experimental test of risk assessment
Authors:Häberli, M. A.; Aeschlimann, P. B.; Milinski, M.
Date of Publication (YYYY-MM-DD):2005-10
Title of Journal:Ethology Ecology & Evolution
Issue / Number:3
Start Page:249
End Page:259
Review Status:not specified
Audience:Not Specified
Abstract / Description:Small fish often approach and "inspect" a detected predator from a short distance. This apparently paradoxical behaviour has been shown experimentally to incur a risk of death. To have a net benefit predator inspection behaviour must be advantageous. We tested experimentally whether a closer inspection distance per se provides inspecting three-spined sticlebacks (Gasterosteus aculeatus) with more information about a pike's (Esox lucius) hunger state. This prediction was confirmed: test fish that had been assigned to a close inspection distance started foraging earlier after they had inspected a satiated pike compared to those that had inspected a hungry pike. The fish could not assess the pike's hunger state as precisely from a far inspection distance. This was shown by a significant interaction between hunger state of the pike and inspection distance on the time to start foraging. The sticklebacks used the information gained from inspecting the predator because they attacked their own prey more frequently after they had inspected a satiated pike. This effect was most apparent when the fish attackeda high Daphnia density (which impairs vigilance) more frequently after they had seen a satiated pike from a close distance.
Free Keywords:Gasterosteus; predator; inspection; predation risk; assessment; foraging
External Publication Status:published
Document Type:Article
Affiliations:MPI für Limnologie/Abt. Evolutionsökologie
External Affiliations:Department of Zoology, University of Berne, Switzerland
Identifiers:ISSN:0394-9370 [ID-No:1]
LOCALID:2432/S 38450 [Listen-Nummer/S-Nummer]
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