Diel changeover of fish assemblages in shallow sandy habitats of lowland rivers of different sizes
Diel dynamics Shower Curtain of species richness and fish abundance were studied in three lowland rivers that differed significantly in size (discharge) in to the upper Vistula River drainage system (Poland).Shallow sandy habitats at point bars were repeatedly sampled with beach seining over 24-h periods.Species richness peaked at dusk and then dec