Environmental Biology of Fishes

, Volume 97, Issue 5, pp 529–542 | Cite as

Woody debris and terrestrial invertebrates – effects on prey resources for brown trout (Salmo trutta) in a boreal stream

  • Pär GustafssonEmail author
  • Larry A. Greenberg
  • Eva Bergman


Intensive forestry and other activities that alter riparian vegetation may disrupt the connectivity and the flux of energy between terrestrial and aquatic habitats and have large effects on biota, especially in small streams. We manipulated the amount of in-stream wood and the flux of terrestrial invertebrate subsidies to determine how these factors affected potential food resources for drift-feeding brown trout (Salmo trutta ) in a boreal Swedish forest stream. Specifically, we followed the effects on the abundance of aquatic and terrestrial invertebrate fauna from June to August 2007. The treatments were 1) addition of wood, unmanipulated terrestrial invertebrate inputs, 2) reduction of terrestrial invertebrate inputs (using canopy covers), no addition of wood, 3) unmanipulated ambient conditions, 4) simultaneous addition of wood and reduction of terrestrial invertebrate inputs. Added wood resulted in greater biomass of aquatic invertebrate biomass, and both input and drift of terrestrial invertebrates were reduced by canopy covers. In terms of total potential prey biomass, the addition of wood with ambient levels of terrestrial invertebrate inputs had the highest standing crop of benthic, wood-living and terrestrial invertebrates combined, whereas the treatment with reduced terrestrial input and no wood added had the lowest standing crop. Our study indicates that forest practices that both reduce the recruitment of wood and the input of terrestrial invertebrates to small streams have negative effects on prey availability for drift-feeding brown trout. The positive effects of wood addition on biomass of aquatic macroinvertebrates may partly compensate for the negative effects of reduced terrestrial invertebrate subsidies.


Riparian zone Large woody debris Terrestrial invertebrates Prey resources Aquatic benthic macroinvertebrates 



We would like to express our genuine appreciation for the help we received by Tomas Axelsson, Oskar Calson and David Zetterqvist, both in the field and laboratory. Much appreciation also goes to the local fishery board of Lake Övre Gla and their chairman, Mats Gustafsson, for making the stream available and for vital support in many practical matters. Certificate number from the Swedish ethical board of animal welfare: 99–2007.


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Pär Gustafsson
    • 1
    • 2
    Email author
  • Larry A. Greenberg
    • 1
  • Eva Bergman
    • 1
  1. 1.Department of BiologyKarlstad UniversityKarlstadSweden
  2. 2.County Administrative Board of VärmlandKarlstadSweden

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