The lotic fauna in water-logged sediments beyond the waterline in the canalized Danube
Bankfull lines are the lateral borders of streams and well defined in hydrology (Leopold et al. 1964). But this border is not very distinct and difficult to localize under natural conditions in difference to canalized stretches. Beyond the border lines are floodplain and/or terrestric systems and inside is the stream ecosystem. This "inside" part is termed "active flood plain" by Ward et al. (1999) because of its dynamic nature and only periodically flooded channel areas, which can be very large in nature. The relationship between permanently and periodically flooded channel areas depends on the landscape. In gorge sections periodically flooded areas are smallest and in braided sections largest.