• its population in neighbouring river sections. If there are functional barriers in the biocorridor such as dams, strongly polluted sections, or concrete riverbeds, migration is hindered and the relevant river section may remain with no fish for long time even if the conditions improve.<br>• Another key component of the river biocorridor is the continuous belt of riparian vegetation. This is a basic interlink for many animals in the course of their regular migrations.<br>• River corridors are often the only natural link between isolated forest areas and the survival of a large number of plants and animals that depends on them (Fig. 14).
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