Food consumption by fish populations in the Warta River, Poland, before and after impoundment
Identifieur interne : 001249 ( Main/Exploration ); précédent : 001248; suivant : 001250Food consumption by fish populations in the Warta River, Poland, before and after impoundment
Auteurs : T. Penczak [Pologne]Source :
- Hydrobiologia [ 0018-8158 ] ; 1995-03-01.
English descriptors
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Abstract
Abstract: The impact of impoundment on the energy budget and gross ecological efficiency (K 1) of fish populations in sites upstream from the backwater (AB) and downstream of the dam (CD) of a manmade reservoir (17.6 km2) located in the middle reaches of the lowland Warta River (808 km long), was investigated. Consumption (MJ ha−1 yr-1) in four years following the reservoir's impoundment was 34–74% lower in site AB, and 43–75% in site CD than before the impoundment. K 1 of investigated species was higher before the impoundment and only pike exhibited an inverse efficiency trend. Significant differences were also observed in the diet of certain dominant fish species, which resulted from a change in the food supply as well as a reduction in their life span after the river was dammed.
Url:
DOI: 10.1007/BF00006398
Affiliations:
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