Ann. Limnol. - Int. J. Lim.
Volume 41, Number 1, March 2005
|Page(s)||7 - 13|
|Published online||15 February 2009|
Effects of weir construction on fish population structure in the River Erro (North of Spain)
Department of Zoology and Ecology, Faculty of Sciences, University of Navarra, Irunlarrea s/n, E-31080 Pamplona, Spain
Corresponding author: email@example.com
In 1996, a compound gauging weir was built in Villaveta Township (Navarra, North of Spain) in the river Erro (Ebro River Basin). Before and after its construction, fish and physical and chemical variables were examined to determine weir’s impact on the reach. Fish captured by electrofishing were measured (total length), and population density and length distribution of the species were estimated. Species diversity (Shannon’s diversity index), dominance (Simpson’s dominance index) and evenness were also calculated. The results revealed an increase in fish population density, especially in smaller specimens, but a decrease in the larger fishes. Substrate and shelter alterations could explain the observed variations in the fish community. In order to improve the consolidation of well-developed fish populations, the placement of great boulders and the restoration of the riparian vegetation are suggested.
Key words: compound gauging weir / habitat modification / abundance / assemblage structure
© Université Paul Sabatier, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.