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

In English

Författare

  • Lene Jacobsen
  • Soren Berg
  • Henrik Baktoft
  • Anders Nilsson
  • Christian Skov

Summary, in 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.

Publiceringsår

2014

Språk

Engelska

Sidor

187-190

Publikation/Tidskrift/Serie

Journal of Limnology

Volym

73

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Page Press

Ämne

  • Ecology

Nyckelord

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

Status

Published

Forskningsgrupp

  • Aquatic Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1129-5767