Hydrobiologia

, Volume 545, Issue 1, pp 257–270

Habitat utilisation by fish community in a short-term regulated river reservoir

Primary Research Paper

DOI: 10.1007/s10750-005-3318-z

Cite this article as:
Vehanen, T., Jurvelius, J. & Lahti, M. Hydrobiologia (2005) 545: 257. doi:10.1007/s10750-005-3318-z

Abstract

Short-term streamflow regulation (hydropeaking) affects the ecology of regulated rivers. We examined the longitudinal and temporal changes occurring in fish assemblages in a hydropeaking single river reservoir between two power plants by using electrofishing along the shoreline, hydroacoustics and test fishing in the open water. A longitudinally changing fish community was found among bottom-dwelling fish in the fast-flowing and highly disturbed upstream part of the reservoir progressing to generalists and pelagic fish in the lentic and most stable environment at the downstream end. The fish assemblage showed temporal patterns as fish density increased during night-time darkness and also towards autumn. Our work provides evidence for gradient effects of flow regulation and contributes to awareness of the effects of disturbance (flow/habitat variability) on biological systems.

Keywords

diel migration, disturbance effect, fish assemblage, fish community, habitat use, hydropeaking, hydropower 

Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Finnish Game and Fisheries Research Institute, Kainuu Fisheries Research and AquacultureFinland
  2. 2.Finnish Game and Fisheries Research Institute, Saimaa Fisheries Research and AquacultureFinland
  3. 3.Fortum Power and Heat, Technology CenterFORTUMFinland

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