Abstract
Effects of impoundment on fish populations, production, energy budget, food consumption and gross ecological efficiency (K 1) in sites upstream from the backwater and in the tailwater of a reservoir located in the middle course of the lowland Warta River were investigated. Production never approached preimpoundment values at either site, even though water temperature did not decrease and water quality slightly improved during nine years after damming. Turnover ratio was significantly positively correlated with water temperature and discharge after impoundment. This was demonstrated only after extending the investigations by five years. After impoundment energy demands for costs of living were higher, although evidence is provided that fish populations were not starving. Gross ecological efficiency of the fish populations which were investigated was lower after impoundment and the coefficient was significantly negatively correlated with water temperature and positively correlated with discharge.
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Penczak, T. Fish production and food consumption in the Warta River (Poland): continued post-impoundment study (1990-1994). Hydrobiologia 416, 107–123 (1999). https://doi.org/10.1023/A:1003859303004
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DOI: https://doi.org/10.1023/A:1003859303004