DIEL CHANGEOVER OF FISH ASSEMBLAGES IN SHALLOW SANDY HABITATS OF LOWLAND RIVERS OF DIFFERENT SIZES

Diel dynamics 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 Hair Accessories 24-h periods.Species richness peaked at dusk and then d

Plants possess regulatory mechanisms that allow them to flower under conditions that maximize reproductive success.Selection of natural variants affecting those mechanisms has been critical in agriculture to modulate the flowering response of crops to specific environments and to increase yield.In the temperate cereals, wheat and barley, the photop