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The effect of turbidity and prey fish density on consumption rates of piscivorous Eurasian perch Perca fluviatilis

Author:
  • Lene Jacobsen
  • Soren Berg
  • Henrik Baktoft
  • Anders Nilsson
  • Christian Skov
Publishing year: 2014
Language: English
Pages: 187-190
Publication/Series: Journal of Limnology
Volume: 73
Issue: 1
Document type: Journal article
Publisher: Page Press

Abstract english

Predator-prey interaction strengths in variable environments constitute a fundamental link to the understanding of aquatic ecosystem responses to environmental change. The present study investigates the effects of visibility conditions and prey fish density on predation rates of visually oriented piscivorous Eurasian perch Perca fluviatilis L. This was done in outdoor mesocosm (16 m(2)) experiments with clear water and two levels of turbidity (25 and 105 NTU) and two prey fish densities [3.1 and 12.5 roach Rutilus rutilus (L.) individuals m(-2)]. Perch consumption rates were affected by visibility less than expected, while they were highly affected by increased prey fish density. Perch responded to high prey density in all visibility conditions, indicating that prey density is more crucial for consumption than visibility in turbid lakes.

Keywords

  • Ecology
  • visibility
  • roach prey
  • mesocosm
  • piscivory
  • hunting mode

Other

Published
  • ISSN: 1129-5767
Anders Nilsson
E-mail: anders [dot] nilsson [at] biol [dot] lu [dot] se

Professor

Aquatic ecology

+46 46 222 83 65

+46 70 346 25 66

E-D130

50

Research group

Aquatic Ecology

Projects

Doctoral students and postdocs

Main supervisor

Varpu Pärssinen

Assistant supervisor

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