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Influence of predator and dietary chemical cues on the behaviour and shredding efficiency of Gammarus pulex

Author:
  • Kajsa Åbjörnsson
  • Jonas Dahl
  • Per Nyström
  • Christer Brönmark
Publishing year: 2000
Language: English
Pages: 379-387
Publication/Series: Aquatic Ecology
Volume: 34
Issue: 4
Document type: Journal article
Publisher: Springer

Abstract english

In two laboratory experiments, we examined short- and long-term responses of the detritivorous amphipod Gammarus pulex to chemical cues from potential predators fed various diets. In the first experiment we studied the short-term effect on G. pulex (locomotory activity) when exposed to chemical cues from three co-existing predators; sculpin (Cottus gobio), trout (Salmo trutta), and signal crayfish (Pacifastacus leniusculus). Chemicals from sculpins and trout induced a short-term decrease in locomotory activity in G. pulex, whereas crayfish did not. There was no difference in activity between G. pulex exposed to water scented by trout or sculpin, and these responses were independent of predator diet (G. pulex, Asellus aquaticus and starved). In the second experiment we examined whether longer-term exposure (4 week) to chemical cues from sculpins affects rates of leaf processing by G. pulex. During the first week, G. pulex consumed significantly more leaves in the control (i.e., no fish cue) than in the fish cue treatment. After 4 weeks, however, there was no difference in total leaf processing rate between treatments indicating an adaptation to the cue.

Keywords

  • Ecology

Other

Published
  • ISSN: 1386-2588
Christer Brönmark
E-mail: christer [dot] bronmark [at] biol [dot] lu [dot] se

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Division aquatic ecology

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Professor

Aquatic Ecology

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Professor

Division aquatic ecology

+46 46 222 37 02

+46 73 081 55 48

E-C125

Sölvegatan 37, Lund

50

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Aquatic Ecology

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