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

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 t...

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Bibliographic Details
Published in:Hydrobiologia 2005-08, Vol.545 (1), p.257-270
Main Authors: VEHANEN, Teppo, JURVELIUS, Juha, LAHTI, Markku
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Fish
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
General aspects
Power plants
Regulated rivers
Reservoirs
River regulations
Rivers
Stream discharge
Stream flow
Synecology
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Summary: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.[PUBLICATION ABSTRACT]
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-005-3318-z