The mass death of Unio crassus in the Ohře River
Ohře is one of the rivers, which retained in part the original structure of the flow with the presence of shallower, more flowing sections with deeper pools and fountains. This is the reason why there are several protected animals in the Ohře, for which the well-known European locality (EVL) was declared on the river Ohře.
Periodic droughts in streams: the next negative factor influencing crayfish populations
Periodic droughts in small streams are caused by climate changes but also by the inappropriate management of precipitation and surface water. If these factors act simultaneously, water level rapidly declines even up to the complete drying up of long sections of the stream.
